US20060142530A1

US20060142530A1 - Water- and oil-repellent fluorourethanes and fluoroureas

Info

Publication number: US20060142530A1
Application number: US11/027,633
Authority: US
Inventors: George Moore; Ramesh Kumar; Zai-Ming Qiu; John Clark; Chetan Jariwala
Original assignee: 3M Innovative Properties Co
Current assignee: 3M Innovative Properties Co
Priority date: 2004-12-28
Filing date: 2004-12-28
Publication date: 2006-06-29
Also published as: EP1838746A1; US7268197B2; WO2006071498A1; CN101094877B; BRPI0519557A2; CA2592369A1; CN101094877A; US20060142474A1; MX2007007850A; EP1838746B1; JP2008525618A

Abstract

A fluorochemical compound comprises the reaction product of: (a) the reaction product of: (i) at least one fluorochemical alcohol represented by the formula:
C_nF_2n+1—X—OH wherein:
n=1 to 6,

R=hydrogen or an alkyl group of 1 to 4 carbon atoms, m=2 to 8,

- - R_f=C_nF_2n+1, y=0 to 6, q=1 to 8; and (ii) at least one unbranched symmetric diisocyanate, and (b) at least one co-reactant comprising two or more functional groups that are capable of reacting with an isocyanate group.

Description

FIELD

This invention relates to water- and oil-repellent fluorochemicals such as fluorourethanes and fluoroureas, and to methods for making the fluorochemicals.

BACKGROUND

Various fluorinated resins containing urethane linkages are known to have oil and water repellency properties (see, for example, U.S. Pat. No. 4,321,404 (Williams et al.), U.S. Pat. No. 4,778,915 (Lina et al.), U.S. Pat. No. 4,920,190 (Lina et al.), U.S. Pat. No. 5,144,056 (Anton et al.), and U.S. Pat. No. 5,446,118 (Shen et al.)). These resins can be polymerized and applied as coatings to substrates such as, for example, textiles, carpets, wall coverings, leather, and the like to impart water- and oil repellency.
Typically, these resins comprise long chain pendant perfluorinated groups (for example, 8 carbon atoms or greater) because long chains readily align parallel to adjacent pendant groups attached to acrylic backbone units, and thus maximize water- and oil-repellency. However, long chain perfluorinated group-containing compounds such as, for example, perfluorooctyl containing compounds may bioaccumulate in living organisms (see, for example, U.S. Pat. No. 5,688,884 (Baker et al.)).

SUMMARY

In view of the foregoing, we recognize that there is a need for water- and oil-repellent compounds that are less bioaccumulative.
Briefly, in one aspect, the present invention provides water- and oil-repellent fluorochemical compounds such as fluorourethanes and fluoroureas that have short chain perfluorinated groups (6 carbon atoms or less), which are believed to be less toxic and less bioaccumulative than longer chain perfluorinated groups (see, for example, WO 01/30873). The fluorochemical compounds of the invention comprise the reaction of (a) the reaction product of:
(i) at least one fluorochemical alcohol represented by the formula:
C_nF_2n+1—X—OH

- wherein:
  - n=1 to 6,
  - R=hydrogen or an alkyl group of 1 to 4 carbon atoms,
  - m=2 to 8,
  - R_f=C_nF_2n+1,
  - y=0 to 6,
  - q=1 to 8; and
- (ii) at least one unbranched symmetric diisocyanate, and
  (b) at least one co-reactant comprising two or more functional groups that are capable of reacting with an isocyanate group.

The invention also provides fluorochemical compounds comprising the reaction product of:
(a) at least one fluorinated isocyanate represented by the following general formula:
C_nF_2n+1—X—OC(O)NH-A-NCO

- wherein:
  - n=1 to 6,
  - R=H or an alkyl group of 1 to 4 carbon atoms,
  - m=2 to 8,
  - R_f=C_nF_2n+1,
  - y=0 to 6,
  - q=1 to 8, and
  - A=an unbranched symmetric alkylene group, arylene group, or aralkylene group; and

(b) at least one co-reactant comprising two or more functional groups that are capable of reacting with an isocyanate group.
It has been discovered that the fluorochemical compounds of the invention exhibit good water- and oil-repellency properties. In light of the prior art, one would expect that fluorochemical compounds derived from shorter perfluorinated chains would not be as effective at imparting water- and oil-repellency as those derived from longer perfluorinated chains (see, for example, U.S. Pat. No. 2,803,615 (Ahlbrecht et al.) and U.S. Pat. No. 3,787,351 (Olson)). Surprisingly, however, the fluorochemical compounds of the invention exhibit water- and oil-repellency comparable to fluorochemical compounds with longer perfluorinated chains.
The fluorochemical compounds of the invention therefore meet the need in the art for water- and oil-repellent compounds that are less bioaccumulative.
In other aspects, this invention also provides coating compositions and release coating compositions comprising the fluorochemical compounds, and articles coated with the coating or release coating compositions.

DETAILED DESCRIPTION

Fluorinated isocyanates useful in the invention are the reaction product of at least one fluorochemical alcohol and at least one unbranched symmetric diisocyanate.
Useful fluorochemical alcohols can be represented by the formula:
C_nF_2n+1—X—OH

- wherein:
  - n=1 to 6,
  - R=hydrogen or an alkyl group of 1 to 4 carbon atoms,
  - m=2 to 8,
  - R_f=C_nF_2n+1,
  - y=0 to 6, and
  - q=1 to 8.

Representative examples of suitable alcohols include CF₃CH₂OH, (CF₃)₂CHOH, (CF₃)₂CFCH₂OH, C₂F₅SO₂NH(CH₂)₂OH, C₂F₅SO₂NCH₃(CH₂)₂OH, C₂F₅SO₂NCH₃(CH₂)₄OH, C₂F₅SO₂NC₂H₅(CH₂)₆OH, C₂F₅(CH₂)₄OH, C₂F₅CONH(CH₂)₄OH, C₃F₇SO₂NCH₃(CH₂)₃OH, C₃F₇SO₂NH(CH₂)₂OH, C₃F₇CH₂OH, C₃F₇CONH(CH₂)₈OH, C₄F₉(CH₂)₂OH, C₄F₉SO₂NCH₃(CH₂)₂OH, C₄F₉CONH(CH₂)₂OH, C₄F₉SO₂NCH₃(CH₂)₄OH, C₄F₉SO₂NH(CH₂)₇OH, C₄F₉SO₂NC₃H₇(CH₂)₂OH, C₄F₉SO₂NC₄H₉(CH₂)₂OH, C₅F₁₁SO₂NCH₃(CH₂)₂OH, C₅F₁₁CONH(CH₂)₂OH, C₅F₁₁(CH₂)₄OH, C₆F₁₃COHN(CH₂)₄OH, C₆F₁₃SO₂NCH₃(CH₂)₂OH, C₆F₁₃(CH₂)₂OH, and the like.
Preferably, n is 1 to 5; more preferably, n is 1 to 4; most preferably, n is 4. Preferably, m is 2 to 4. Preferably, q is 2.
Preferably, X is

More preferably, X is

Most preferably, X is selected from the group consisting of
Preferred fluorochemical alcohols include, for example, C₄F₉SO₂NCH₃(CH₂)₂OH, C₄F₉SO₂NCH₃(CH₂)₄OH, and C₄F₉(CH₂)₂OH. A more preferred fluorochemical alcohol is C₄F₉SO₂NCH₃(CH₂)₂OH.
The above-described fluorochemical alcohols can be reacted with an unbranched symmetric diisocyanate to form a fluorinated isocyanate. Symmetric diisocyanates are diisocyanates that meet the three elements of symmetry as defined by Hawley's Condensed Chemical Dictionary 1067 (1997). First, they have a center of symmetry, around which the constituent atoms are located in an ordered arrangement. There is only one such center in the molecule, which may or may not be an atom. Second, they have a plane of symmetry, which divides the molecule into mirror-image segments. Third, they have axes of symmetry, which can be represented by lines passing through the center of symmetry. If the molecule is rotated, it will have the same position in space more than once in a complete 360° turn.
As used herein, the term “unbranched” means that the symmetric diisocyanate does not contain any subordinate chains of one or more carbon atoms.
Representative examples of unbranched symmetric diisocyanates include 4,4′-diphenylmethane diisocyanate (MDI), 1,6-hexamethylene diisocyanate (HDI), 1,4-phenylene diisocyanate (PDI), 1,4-butane diisocyanate (BDI), 1,8-octane diisocyanate (ODI), 1,12-dodecane diisocyanate, and 1,4-xylylene diisocyanate (XDI).
Preferred unbranched symmetric diisocyanates include, for example, MDI, HDI, and PDI. A more preferred unbranched symmetric diisocyanate is MDI. In its pure form, MDI is commercially available as Isonate™ 125M from Dow Chemical Company (Midland, Mich.), and as Mondur™ from Bayer Polymers (Pittsburgh, Pa.).
The fluorinated isocyanates useful in the invention can be prepared, for example, by combining the fluorochemical alcohol and unbranched symmetric diisocyanate in a solvent. Useful solvents include esters (for example, ethyl acetate), ketones (for example, methyl ethyl ketone), ethers (for example, methyl-tert-butyl ether), alkanes (for example, hexane or heptane), and aromatic solvents (for example, toluene).
Preferably, the reaction mixture is agitated. The reaction can generally be carried out at a temperature between room temperature and about 120° C. (preferably, between about 50° C. and about 70° C.).
Typically the reaction is carried out in the presence of a catalyst. Useful catalysts include bases (for example, tertiary amines, alkoxides, and carboxylates), metal salts and chelates, organometallic compounds, acids and urethanes. Preferably, the catalyst is an organotin compound (for example, dibutyltin dilaurate (DBTDL) or a tertiary amine (for example, diazobicyclo[2.2.2]octane (DABCO)), or a combination thereof. More preferably, the catalyst is DBTDL.
Useful fluorinated isocyanates can be represented by the following general formula:
C_nF_2n+1—X—OC(O)NH-A-NCO

- wherein:
  - n=1 to 6,
  - R=H or an alkyl group of 1 to 4 carbon atoms,
  - m=2 to 8,
  - R_f=C_nF_2n+1,
  - y=0 to 6,
  - q=1 to 8, and
  - A=an unbranched symmetric alkylene group, arylene group, or aralkylene group

Preferably, n is 1 to 5; more preferably, n is 1 to 4; most preferably, n is 4. Preferably, q is 2.
Preferably, X is

and m is 2 to 4.
Preferably, A is selected from the group consisting of C₆H₁₂,

and

more preferably, A is
The above-described fluorinated isocyanates can be reacted with a co-reactant comprising two or more functional groups that are capable of reacting with an isocyanate group to form a water- and oil-repellent fluorochemical compound of the invention. Groups capable of reacting with an isocyanate reactive group include, for example, -Z-H groups, wherein each Z is independently selected from the group consisting of O, N, and S. Preferably, Z is O or N.
Suitable co-reactants include, for example, polyols, polyamines, and polythiols. As used herein, the prefix “poly” means two or more. For example, the term “polyols” includes diols, triols, tetraols, etc.
Polyols include, for example, acrylate polymers and copolymers from hydroxyl-containing (meth)acrylate monomers; diols such as polyether diols, polyester diols, dimer diols, fatty acid ester diols, polysiloxane dicarbinols, and alkane diols; alkane tetraols; polyvinyl alcohols; polyepoxides; polystyrene; polyesters; polyurethanes; and the like.
Examples of useful acrylate copolymers include copolymers of hydroxyl-containing (meth)acrylates such as hydroxyethyl acrylate with monomers such as butyl acrylate, isooctyl acrylate, or octadecyl acrylate; poly co{hydroxyethyl acrylate/CH₂═CCH₃CO₂C₃H₆(Si(CH₃)₂O)_nSi(CH₃)₂C₄H₉}; poly co{hydroxyethyl acrylate/mercaptopropylmethylsiloxane-co-dimethylsiloxane}; and poly(2-hydroxyethyl methacrylate); and the like.
Examples of fatty ester diols include glycerol mono-oleate, glycerol mono-stearate, glycerol mono-ricinoleate, glycerol mono-tallow, long chain alkyl di-esters of pentaerythritol, and the like.
Examples of polyester polyols include polycaprolactone diol and hyperbranched polyester polyols available from Perstorp Polyols, Inc. (Toledo, Ohio).
Polysiloxane dicarbinols include polydialkylsiloxane dicarbinols and polyalkylarylsiloxane dicarbinols. Useful polysiloxane dicarbinols include, for example, those that correspond to one of the following formulas:

wherein R¹and R²independently represent an alkylene having 1 to 4 carbon atoms, R³, R⁴, R⁵, R⁶, R⁷, R⁸and R⁹independently represent an alkyl group having 1 to 4 carbon atoms or an aryl group, L represents a trivalent linking group and p represents a value of 10 to 50. L is for example a linear or branched alkylene that may contain one or more catenary hetero atoms such as oxygen or nitrogen.
Examples of polyvinyl alcohols include poly(vinyl alcohol), poly(vinyl acetate-co-vinyl alcohol, poly(vinyl alcohol-co-ethylene), and the like.
Examples of polyepoxides include polyglycidol (linear or hyperbranched) and the like.
Examples of polystyrenes include poly(4-vinylphenol), poly(4-vinylphenol-co-2-hydroxyethyl methacrylate, and the like.
Useful polyamines include, for example, polyamines having at least two amino groups, wherein the two amino groups are primary, secondary, or a combination thereof. Examples include H₂N(CH₂CH₂NH)₂H, H₂N(CH₂CH₂NH)₃H, H₂N(CH₂CH₂NH)₄H, H₂N(CH₂CH₂NH)₅H, H₂N(CH₂CH₂CH₂NH)₂H, H₂N(CH₂CH₂CH₂NH)₃H, H₂N(CH₂CH₂CH₂CH₂NH)₂H, H₂N(CH₂CH₂CH₂CH₂CH₂CH₂NH)₂H, H₂N(CH₂)₃NHCH₂CH═CHCH₂NH(CH₂)₃NH₂, H₂N(CH₂)₄NH(CH₂)₃NH₂, H₂N(CH₂)₃NH(CH₂)₄NH(CH₂)₃NH₂, H₂N(CH₂)₃NH(CH₂)₂NH(CH₂)₃NH₂, (CH₂)₂NH(CH₂)₃NH(CH₂)₂NH₂, H₂N(CH₂)₃NH(CH₂)₂NH₂, C₆H₅NH(CH₂)₂NH(CH₂)₂NH₂, 1,10-diaminodecane, 1,12-diaminododecane, 9,9-bis(3-aminopropyl)fluorene, bis(3-aminopropyl)phenylphosphine, 2-(4-aminophenyl)ethylamine, 1,4-butanediol bis(3-aminopropyl) ether, N(CH₂CH₂NH₂)₃, 1,8-diamino-p-menthane, 4,4′-diaminodicyclohexylmethane, 1,3-bis(3-aminopropyl)tetramethyldisiloxane, 1,8-diamino-3,6-dioxaoctane, 1,3-bis(aminomethyl)cyclohexane, 1,4-bis(3-aminopropyl)piperazine, and polymeric polyamines such as linear or branched (including dendrimers) homopolymers and copolymers of ethyleneimine (that is, aziridine), aminopropylmethylsiloxane-co-dimethylsiloxane, bis-aminopropyldimethylsiloxane, and the like.
Polythiols include the homopolymer of mercaptopropylmethylsiloxane and its copolymers with dimethylsiloxane (available from Gelest Inc.), 1,1,1-trimethylolpropane tris-(3-mercaptopropionate), pentaerythritol tetra(3-mercaptopropionate), trimethylolpropane tris(3-mercaptopropionate), tris[2-(3-mercaptopropionyloxy)ethyl] isocyanurate, and the like.
Examples of dithiols include 2,2′-oxydiethanethiol, 1,2-ethanethiol, 3,7-dithia-1,9-nonanedithiol, 1,4-butanedithiol, 1,6-hexanedithiol, 1,7-heptanedithiol, 1,8-octanedithiol, 1,9-nonanedithiol, 3,6-dioxa-1,8-octanedithiol, 1,10-decanedithiol, 1,12-dimercaptododecane, ethylene glycol bis(3-mercaptopropionate), 1,4-butanediol bis(3-mercaptopropionate), and the like.
The fluorochemical compounds of the invention can be prepared, for example, by combining the fluorinated isocyanate and the co-reactant comprising two or more functional groups that are capable of reacting with an isocyanate group in a solvent. Useful solvents include esters (for example, ethyl acetate), ketones (for example, methyl ethyl ketone), ethers (for example, methyl-tert-butyl ether), and aromatic solvents (for example, toluene).
Preferably, the reaction mixture is agitated. The reaction can generally be carried out at a temperature between room temperature and about 120° C. (preferably, between about 50° C. and about 70° C.).
Typically the reaction is carried out in the presence of a catalyst. Useful catalysts include bases (for example, tertiary amines, alkoxides, and carboxylates), metal salts and chelates, organometallic compounds, acids and urethanes. Preferably, the catalyst is an organotin compound (for example, dibutyltin dilaurate (DBTDL) or a tertiary amine (for example, diazobicyclo[2.2.2]octane (DABCO)), or a combination thereof. More preferably, the catalyst is DBTDL.
Typically, some unreacted functional groups will remain. Unreacted functional groups can be useful, for example, for improving adhesion or for crosslinking.
Fluorochemical compounds of the invention can be used in coating compositions to impart water- and oil-repellency to a wide variety of substrates. The coating compositions comprise a fluorochemical compound of the invention and a solvent (for example, water and/or an organic solvent). When the solvent is water, the coating composition typically further comprises a surfactant.
The fluorochemical compounds of the invention can be dissolved, suspended, or dispersed in a wide variety of solvents to form coating compositions suitable for coating onto a substrate. The coating compositions can generally contain from about 0.1 about 10 percent fluorochemical compound (preferably about 1 to about 5 percent), based on the weight of the coating composition.
The coating compositions can be applied to a wide variety of substrates such as, for example, fibrous substrates and hard substrates. Fibrous substrates include, for example, woven, knit, and non-woven fabrics, textiles, carpets, leather, and paper. Hard substrates include, for example, glass, ceramic, masonry, concrete, natural stone, man-made stone, grout, metals, wood, plastics, and painted surfaces.
The coating compositions can be applied to a substrate (or articles comprising a substrate) by standard methods such as, for example, spraying, padding, dipping, roll coating, brushing, or exhaustion. Optionally, the composition can be dried to remove any remaining water or solvent.
The fluorochemical compounds of the invention can be used for release coatings. The release coating compositions may or may not require a curing step after coating on a substrate.
Coating compositions useful for release coatings can be applied to surfaces requiring release properties from adhesives. Substrates suitable for release coatings include, for example, paper, metal sheets, foils, non-woven fabrics, and films of thermoplastic resins such as polyesters, polyamides, polyolefins, polycarbonates, and polyvinyl chloride.
Release coating compositions can be applied to suitable substrates by conventional coating techniques such as, for example, wire-wound rod, direct gravure, offset gravure, reverse roll, air-knife, and trailing blade coating. The resulting release coating compositions can provide effective release for a wide variety of pressure sensitive adhesives such as, for example, natural rubber based adhesives, silicone based adhesives, acrylic adhesives, and other synthetic film-forming elastomeric adhesives.

EXAMPLES

Objects and advantages of this invention are further illustrated by the following examples, but the particular materials and amounts thereof recited in these examples, as well as other conditions and details, should not be construed to unduly limit this invention.

Glossary



Designator	Name, structure and/or formula	Availability

Boltron H50	Boltron H50 polyester polyol	Perstorp, Sweden
DBTDL	Dibutyltin dilaurate;	Sigma Aldrich
	[CH₃(CH₂)₁₀CO₂]₂Sn[(CH₂)₃(CH₃)]₂	Milwaukee, WI
DDT	Dodecanethiol; CH₃(CH₂)₁₁SH	Sigma Aldrich
EtOAc	Ethyl acetate	Sigma Aldrich
	CH₃CO₂CH₂CH₃
GA	Glutaric anhydride;	Sigma Aldrich



HEA	2-Hydroxyethyl acrylate;	Sigma Aldrich
	HOCH₂CH₂OC(O)CH═CH₂
IOA	Isooctyl acrylate	3M Company,
		St. Paul, MN
“KF-2001”	Random copolymer of	Gelest Inc.,
	mercaptopropylmethylsiloxane and	Morrisville, PA
	dimethylsilicone
	(MW ˜ 8,000; with ˜4 equivalent —SH),
	(Cat. No: SMS-042)
MIBK	Methylisobutyl ketone;	Sigma Aldrich
	CH₃C(O)CH(CH₃)(C₂H₅)
MeFBSE	C₄F₉SO₂N(CH₃)C₂H₄OH	May be prepared
		as in U.S. Pat. No. 6,664,354
		(Savu et. al)
		Example 2
MDI	4,4′-methylenebis(phenyl	Sigma Aldrich
	isocyanate);



NMP	N-methyl pyrrolidinone;	Sigma Aldrich



ODA	Octadecyl acrylate;	Sigma Aldrich
	CH₃(CH₂)₁₇OC(O)CH═CH₂
ODI	Octadecyl isocyanate;	Sigma Aldrich
	CH₃(CH₂)₁₇NCO
PEHA	Pentaethylenehexamine;	Sigma Aldrich
	H₂N(CH₂CH₂NH)₄CH₂CH₂NH₂
PMPMS	Poly (mercaptopropyl)methylsiloxane;	Gelest Inc.
	—(O—Si(CH₃)(C₃H₆SH))_n—;
	MW 4,000-7,000
PVA-50	Poly (vinyl alcohol); 50%	Sigma Aldrich
	hydrolyzed
PVA-98	Poly (vinyl alcohol); 98%	Sigma Aldrich
	hydrolyzed
PVA-17K	“CELVOL” polyvinyl alcohol;	Celanese,
	17,000 MW	Dallas, TX
SD-890	Silicone Diamine; GE Silicone	GE,
	88849T; MW 890	Albany, NY
SM	Silicone Macromer;	Gelest Inc.
	monomethacryloxypropyl
	terminated polydimethylsiloxane
	(MW ˜ 10,000), Cat. No: MCR-M11.
TPEG 730	Trimethylolpropane ethoxylate;	Sigma Aldrich
	MW 730
“VAZO-67”	NCC(CH₃)(C₂H₅)N═NC(CH₃)(C₂H₅)CN	DuPont,
		Wilmington, DE

Dynamic Contact Angle Measurement

A test solution, emulsion, or suspension (typically at about 3% solids) was applied to nylon 66 film (available from DuPont) by dip-coating strips of the film. Prior to coating, the film was cleaned with methyl alcohol. Using a small binder clip to hold one end of the nylon film, the strip was immersed in the test solution, and then withdrawn slowly and smoothly from the solution. The coated strip was allowed to air dry in a protected location for a minimum of 30 minutes and then was cured for 10 minutes at 150° C.
Advancing and receding contact angles on the coated film were measured using a CAHN Dynamic Contact Angle Analyzer, Model DCA 322 (a Wilhelmy balance apparatus equipped with a computer for control and data processing, commercially available from ATI, Madison, Wis.). Water and hexadecane were used as probe liquids. Values for both water and hexadecane are reported.

Preparation of C₄F₉SO₂N(CH₃)CH₂CH₂OH (MeFBSE)

MeFBSE was prepared by essentially following the procedure described in U.S. Pat. No. 6,664,354 (Savu et al.), Example 2, Part A.

Preparation of C₄F₉SO₂N(CH₃)C₂H₄OC(O)NHC₆H₄CH₂C₆H₄NCO (MeFBSE-MDI)

A one liter, three-necked round bottom flask, fitted with a heater, nitrogen inlet, reflux condenser and thermocouple was charged with MeFBSE (357.0 g; 1.0 mole) and MEK (600 mL) and heated to reflux, while distilling out 30 mL of MEK. The mixture was then cooled to 30° C. and treated with MDI (750 g; 3.0 mole). The temperature of the mixture was then increased to about 40° C. for 4 hours, filtered and added to toluene (4 l.). The resulting off white precipitate was collected by filtration, and re-crystallized from toluene (white solid; 689.4 g; 57% yield). Structure was confirmed using liquid chromatography/mass spectroscopy (LC/MS) and LC/UV analysis.
Reactant 1. Preparation of HEA/KF2001; 4/1 Equivalent Ratio
A 4 oz. bottle with a magnetic stirring bar was charged with HEA (2.49 g; 0.022 mole), “KF-2001” (10.77 g), MIBK (49.92 g) and “VAZO-67” (0.122 g). Nitrogen was bubbled through the solution for two minutes, and the bottle was sealed and placed in an oil bath at 70° C. for 24 hours. The resulting solution was 21.16% by wt solids, with a small amount of precipitation.

Example 1

Preparation of Reactant 1/MeFBSE-MDI; 1/4

A 4 oz. bottle with a magnetic stirring bar was charged with Reactant 1 (21.16% solution; 20.0 g), MeFBSE-MDI (4.14 g; 0.0068 mole), EtOAc (20.0 g) and DBTDL (3 drops). The bottle was sealed and placed in an oil bath at 70° C. and reacted for 8 hours with magnetic stirring. Analysis using FT-IR (Fourier transform infrared spectroscopy) indicated no —NCO remained. The resulting solution was 21.16% by wt solids, with a small amount of precipitation. The resulting solution was ˜16% wt solids.

Example 2

Preparation of Reactant 1/MeFBSE-MDI; 1/2

The procedure described for Example 1 was essentially followed with the exception that 2.80 g of MeFBSE-MDI was used and the resulting solution was ˜20% solids.

Example 3

Preparation of Reactant 1/MeFBSE-MDI; 1/3

The procedure described for Example 1 was essentially followed with the exception that 3.11 g of MeFBSE-MDI was used and the resulting solution was ˜19% solids.
Reactant 2. Preparation of HEA/KF2001; 8/1 Equivalent Ratio
A 4 oz. bottle with a magnetic stirring bar was charged with HEA (4.64 g; 0.040 mole), “KF-2001” (10.03 g), MIBK (55.44 g) and “VAZO-67” (0.145 g). Nitrogen was bubbled through the solution for two minutes, and the bottle was sealed and placed in an oil bath at 70° C. for 24 hours. The resulting solution was 14.82% by wt solids, with a small amount of precipitation.

Example 4

Preparation of Reactant 2/MeFBSE-MDI; 1/8

A 4 oz. bottle with a magnetic stirring bar was charged with Reactant 2 (14.82% solution; 20.0 g), MeFBSE-MDI (6.948 g; 0.0114 mole), EtOAc (41.89 g) and DBTDL (3 drops). The bottle was sealed and placed in an oil bath at 70° C. and reacted for 8 hours with magnetic stirring. Analysis using FT-IR indicated no —NCO remained. The resulting solution was 15.6% by wt solids, with a small amount of precipitation. The resulting solution was ˜16% wt solids.

Example 5

Preparation of Reactant 2/MeFBSE-MDI; 1/6

The procedure described for Example 4 was essentially followed with the exception that 5.21 g (0.0086 mole) of MeFBSE-MDI was used, 26.88 g of EtOAc was used and the resulting solution was ˜16.8% solids.

Example 6

Preparation of Reactant 2/MeFBSE-MDI 1/4

The procedure described for Example 4 was essentially followed with the exception that 3.474 g (0.0057 mole) of MeFBSE-MDI was used, 32.12 g of EtOAc was used and the resulting solution was ˜13.48% solids.
Reactant 3. Preparation of HEA/KF2001; 16/1 Equivalent Ratio
A 4 oz. bottle with a magnetic stirring bar was charged with HEA (9.31 g; 0.080 mole), “KF-2001” (10.01 g), MIBK (79.32 g) and “VAZO-67” (0.192 g). Nitrogen was bubbled through the solution for two minutes, and the bottle was sealed and placed in an oil bath at 70° C. for 24 hours. The resulting solution was 19.51% by wt solids, with a small amount of precipitation.

Example 7

Preparation of Reactant 3/MeFBSE-MDI; 1/16

A 4 oz. bottle with a magnetic stirring bar was charged with Reactant 3 (19.51% solution; 20.0 g), MeFBSE-MDI (9.76 g; 0.0165 mole), EtOAc (41.32 g) and DBTDL (3 drops). The bottle was sealed and placed in an oil bath at 70° C. and reacted for 8 hours with magnetic stirring. Analysis using FT-IR indicated no —NCO remained. The resulting solution was 18.2% by wt solids, with a small amount of precipitation. The resulting solution was ˜16% wt solids.

Example 8

Preparation of Reactant 3/MeFBSE-MDI; 1/12

The procedure described for Example 7 was essentially followed with the exception that 7.32 g (0.0012 mole) of MeFBSE-MDI was used, 45.60 g of EtOAc was used and the resulting solution was ˜14.87% by wt. solids.

Example 9

Preparation of Reactant 3/MeFBSE-MDI; 1/8

The procedure described for Example 7 was essentially followed with the exception that 4.88 g (0.008 mole) of MeFBSE-MDI was used, 38.79 g of EtOAc was used and the resulting solution was ˜14.87% solids.

Comparative Example C-1

Preparation of MeFBSE-MDI-HEA/“KF2001”; 90/10 wt/wt

A 4 oz. bottle with a magnetic stirring bar was charged with MeFBSE-MDI-HEA (4.50 g; 0.006 mole), “KF-2001” (0.49 g), EtOAc (28.4 g) and “VAZO-67” (0.056 g). Nitrogen was bubbled through the solution for two minutes, and the bottle was sealed and placed in an oil bath at 70° C. for 24 hours. The resulting solution was 13.16% by wt. solids, with a small amount of precipitation. Addition of dimethylformamide (5.0 g) turned the solution clear.

Comparative Example C-2

Preparation of MeFBSE-MDI-HEA/“KF2001”; 80/20 wt/wt

A 4 oz. bottle with a magnetic stirring bar was charged with MeFBSE-MDI-HEA (3.98 g; 0.006 mole), “KF-2001” (1.01 g), EtOAc (27.6 g) and “VAZO-67” (0.050 g). Nitrogen was bubbled through the solution for two minutes, and the bottle was sealed and placed in an oil bath at 70° C. for 24 hours. The resulting solution was 13.37% by wt. solids, with a small amount of precipitation. Addition of dimethylformamide (5.0 g) turned the solution clear.

Comparative Example C-3

Preparation of MeFBSE-MDI-HEA/“KF2001”; 70/30 wt/wt

A 4 oz. bottle with a magnetic stirring bar was charged with MeFBSE-MDI-HEA (3.51 g; 0.005 mole), “KF-2001” (1.01 g), EtOAc (26.75 g) and “VAZO-67” (0.053 g). Nitrogen was bubbled through the solution for two minutes, and the bottle was sealed and placed in an oil bath at 70° C. for 24 hours. The resulting solution was 13.78% by wt. solids, with a small amount of precipitation. Addition of dimethylformamide (5.0 g) turned the solution clear.

Example 10

Preparation of HEA/SM/MeFBSE-MDI; 10/1/8.7

A 4 oz. bottle with a magnetic stirring bar was charged with HEA (1.16 g; 0.010 mole), SM (10.00 g), MIBK (40.0 g), HSCH₂CH₂SH (0.078 g) and “VAZO-67” (0.01 g). Nitrogen was bubbled through the solution for two minutes, and the bottle was sealed and placed in an oil bath at 70° C. for 24 hours. The resulting solution was milky. To this solution was added MeFBSE-MDI (5.3 g; 0.0087 mole) and DBTDL (3 drops). The solution was held at 70° C. for 4 hours. FT-IR Analysis indicated no —NCO remained.

Example 11

Preparation of HEA/SM/MeFBSE-MDI; 15/1/10.36

A 4 oz. bottle with a magnetic stirring bar was charged with HEA (1.74 g; 0.015 mole), SM (10.00 g), MIBK (40.0 g), HSCH₂CH₂SH (0.156 g) and “VAZO-67” (0.01 g). Nitrogen was bubbled through the solution for two minutes, and the bottle was sealed and placed in an oil bath at 70° C. for 24 hours. The resulting solution was milky. To this solution was added MeFBSE-MDI (6.3 g; 0.0104 mole) and DBTDL (3 drops). The solution was held at 70° C. for 4 hours. FT-IR Analysis indicated no —NCO remained.

Example 12

Preparation of HEA/SM/MeFBSE-MDI; 20/1/14.80

A 4 oz. bottle with a magnetic stirring bar was charged with HEA (2.32 g; 0.020 mole), SM (10.00 g), MIBK (40.0 g), HSCH₂CH₂SH (0.312 g) and “VAZO-67” (0.01 g). Nitrogen was bubbled through the solution for two minutes, and the bottle was sealed and placed in an oil bath at 70° C. for 24 hours. The resulting solution was milky. To this solution was added MeFBSE-MDI (9.0 g; 0.0148 mole) and DBTDL (3 drops). The solution was held at 70° C. for 4 hours. FT-IR Analysis indicated no —NCO remained.

Comparative Example C-4

Preparation of MeFBSE-MDI-HEA/SM; 90/10; wt/wt

A 4 oz. bottle with a magnetic stirring bar was charged with MeFBSE-MDI-HEA (2.25 g; 0.031 mole), SM (0.25 g), EtOAc (14.43 g) and “VAZO-67” (0.025 g). Nitrogen was bubbled through the solution for two minutes, and the bottle was sealed and placed in an oil bath at 70° C. for 24 hours. The resulting solution was slightly cloudy. Addition of dimethylformamide (5.0 g) turned the solution clear, yielding a 11.93% wt solids solution. TGA Analysis indicated T_m=156° C., T_c=81° C. and T_g=50° C.

Comparative Example C-5

Preparation of MeFBSE-MDI-HEA/SM; 80/20; wt/wt

A 4 oz. bottle with a magnetic stirring bar was charged with MeFBSE-MDI-HEA (2.00 g; 0.028 mole), SM (0.50 g), EtOAc (14.44 g) and “VAZO-67” (0.026 g). Nitrogen was bubbled through the solution for two minutes, and the bottle was sealed and placed in an oil bath at 70° C. for 24 hours. The resulting solution was slightly cloudy. Addition of dimethylformamide (5.0 g) turned the solution clear, yielding a 11.94% wt solids solution. TGA Analysis indicated T_m=153° C., T_c=79° C. and T_g=50° C.

Comparative Example C-6

Preparation of MeFBSE-MDI-HEA/SM; 60/40; wt/wt

A 4 oz. bottle with a magnetic stirring bar was charged with MeFBSE-MDI-HEA (1.51 g; 0.021 mole), SM (1.01 g), EtOAc (14.45 g) and “VAZO-67” (0.026 g). Nitrogen was bubbled through the solution for two minutes, and the bottle was sealed and placed in an oil bath at 70° C. for 24 hours. The resulting solution was slightly cloudy. Addition of dimethylformamide (5.0 g) turned the solution clear, yielding a 11.95% wt solids solution. TGA Analysis indicated T_m=154° C. and T_c=92.5° C.

Example 13

Preparation of MeFBSE-MDI/PMPMS; 1/1

A 4 oz. bottle with a magnetic stirring bar was charged with MeFBSE-MDI (12.16 g; 0.020 mole), PMPMS (2.68 g; 0.020 mole), EtOAc (60.0 g) and DBTDL (3 drops). Nitrogen was bubbled through the solution for two minutes, and the bottle was sealed and placed in an oil bath at 70° C. for 8 hours. The resulting solution was slightly cloudy. FT-IR Analysis indicated no —NCO remained.

Example 14

Preparation of MeFBSE-MDI/PMPMS; 0.75/1

A 4 oz. bottle with a magnetic stirring bar was charged with MeFBSE-MDI (9.12 g; 0.015 mole), PMPMS (2.68 g; 0.020 mole), EtOAc (47.0 g) and DBTDL (3 drops). The bottle was sealed and placed in an oil bath at 70° C. and reacted for 8 hours with magnetic stirring. The resulting solution was slightly cloudy. Addition of dimethylformamide (5.0 g) turned the solution clear. FT-IR Analysis indicated no —NCO

Example 15

Preparation of MeFBSE-MDI/PEHA; 4/1 Equivalents

A 4 oz. bottle with a magnetic stirring bar was charged with MeFBSE-MDI (5.0 g; 0.008 mole), PEHA (1.16 g; 0.005 mole) and toluene (40.0 g). The bottle was sealed and placed in an oil bath at 70° C. and reacted for 8 hours with magnetic stirring. The resulting solution was slightly cloudy. FT-IR Analysis indicated no —NCO remained.

TABLE 1


Examples 1-15 and Comparative Examples C-1-C-6
Advancing and Receding water and oil contact angles.

	Advancing/Receding
	Contact Angle
	(°)

Example	Water	Oil

1	112/98	53/39
2	109/91	40/32
3	115/98	41/31
4	116/91	58/38
5	117/92	56/37
6	114/95	49/36
7	144/96	59/20
8	110/93	40/33
9	111/91	41/30
10	122/99	46/30
11	110/100	44/27
12	108/98	46/31
13	136/83	85/67
14	126/81	83/67
15	154/105	93/19
C-1	123/99	71/52
C-2	116/95	70/49
C-3	116/93	68/43
C-4	116/97	66/46
C-5	118/99	71/54
C-6	122/107	80/62

Example 16

Preparation of MeFBSE-MDI/PVA-50

A three-necked, 250 mL round bottom flask equipped with a magnetic stirrer, heating mantle, reflux condenser and nitrogen inlet was charged with PVA-50 (2.0 g), NMP (30.3 g), and heptane (26.0 g). The ensuing mixture was heated at 131° C. To this clear solution was added MeFBSE-MDI (13.25 g) and NMP (30.4 g) and the resulting solution was heated at 135° C. for 4 hours, yielding a dark brown solution (20% solids).

Example 17

Preparation of MeFBSE-MDI/PVA-98

A three-necked, 250 mL round bottom flask equipped with a magnetic stirrer, heating mantle, reflux condenser and nitrogen inlet was charged with PVA-98 (1.0 g), NMP (30.3 g), and heptane (26.0 g). The ensuing mixture was heated at 131° C. To this clear solution was added MeFBSE-MDI (10.68 g) and NMP (16.4 g) and the resulting solution was heated at 120° C. for 4 hours, yielding a dark brown solution (20% solids).

Example 18

Preparation of MeFBSE-MDI/PVA-98/ODI

A three-necked, 250 mL round bottom flask equipped with a magnetic stirrer, heating mantle, reflux condenser and nitrogen inlet was charged with PVA-98 (1.0 g), NMP (30.3 g), and heptane (26.0 g). The ensuing mixture was heated at 137° C. To this clear solution was added ODI (2.6 g), MeFBSE-MDI (5.5 g) and NMP (16.4 g) and the resulting solution was heated at 135° C. for 6 hours, yielding an amber colored solution (20% solids).

Example 19

Preparation of MeFBSE-MDI/PVA-98/GA

A three-necked, 250 mL round bottom flask equipped with a magnetic stirrer, heating mantle, reflux condenser and nitrogen inlet was charged with PVA-98 (1.0 g), NMP (30.3 g), and heptane (21.0 g). The ensuing mixture was heated at 131° C. To this clear solution was added MeFBSE-MDI (8.61 g) and the resulting solution was heated at 130° C. for 4 hours. To this solution were added GA (0.623 g) and NMP (8.75 g) and the resulting solution was heated at 130° C. for 5 hours, yielding a dark brown solution (21% solids).

Comparative Example C7

A three-necked, 250 ml round bottom flask equipped with a magnetic stirrer, heating mantle, reflux condenser and nitrogen inlet was charged with PVA-50 (2.97 g) and xylene (12.3 g). The solution was heated to 80 C. To the resulting clear solution was added 5.2 g ODI. The temperature was raised to 137° C. and the reaction was carried out for another 4 hr. Analysis using FT-IR indicated no —NCO remained. The resulting solution was 40% solids.
Release Coatings; Preparation and Test Method.
The copolymers of the invention were diluted to 5% solids with toluene. The solution was then coated with a #6 wire wound (Mayer) rod onto a 1.6 mil primed polyester terephthalate film. The coated film was attached to a fiberboard frame and dried for 15 minutes at 65° C.
The test method used to evaluate the release coatings was a modification of the industry standard peel adhesion test used to evaluate pressure sensitive adhesive coated materials. The standard test is described in detail in various publications of the American Society for Testing and Materials (ASTM), Philadelphia, Pa., and the Pressure Sensitive Tape Council (PSTC), Glenview, Ill. The modified standard method is described in detail below. The reference source of the standard test method is ASTM D3330-78 PSTC-1 (11/75)
2.54 cm by 15.24 cm strips of SCOTCH PERFORMANCE MASKING TAPE 233+ (available from 3M Company, St. Paul, Minn.) were rolled down onto the coated polyester film with a 2.04 kg rubber roller. The laminated samples were then aged for 1 week at 22° C. and 50% relative humidity or for 16 hours at 65° C. Prior to testing, the heat-aged samples were equilibrated to 22° C. and 50% relative humidity for 24 hours.
Release testing was conducted by mounting the masking tape/coated film laminate to the stage of an Instrumentors, Inc. slip/peel tester (model 3M90) with double coated tape. The force required to remove the masking tape at 180 degrees and 228.6 cm/minute was then measured. Tape re-adhesions were also measured by adhering the freshly peeled masking tape to a clean glass plate and measuring the peel adhesion in normal fashion using the same Instrumentors slip/peel tester indicated above, again peeling at 228.6 cm/min and at a 180 degree peel angle. The results of these peel tests are shown in Table 2. The backside of a strip of SCOTCH PERFORMANCE MASKING TAPE 233+ served as a control sample.

Some copolymers of the invention were coated and tested according to the methods described above with the exception that SCOTCH MAGIC TAPE 810 (Available from 3M Company) was used in place of SCOTCH PERFORMANCE MASKING TAPE 233+. The backside of a strip of SCOTCH MAGIC TAPE 810 served as a control sample. The results are shown in Table 2 below.

TABLE 2


Examples 16-19 and Comparative Example C-7. Peel
Force and Readhesion.

Peel Force

Readhesion

		7-day	16 hr @	7-day	16 hr @
Exam-		g/cm	65° C. g/cm	g/cm	65° C. g/cm
ple	Tape	(oz/in)	(oz/in)	(oz/in)	(oz/in)

16	Scotch	156 (14)	257 (23)	312 (28)	268 (24)
	Magic
	Tape
	810
17	Scotch	145 (13)	223 (20)	323 (29)	312 (28)
	Magic
	Tape
	810
C-7	Scotch	123 (11)	234 (21)	179 (16)	167 (15)
	Magic
	Tape
	810
18	Masking	279 (25)	346 (31)	446 (40)	458 (41)
	Tape
	233+
19	Masking	268 (24)	335 (30)	446 (40)	441 (39.5)
	Tape
	233+
C-7	Masking	246 (22)	335 (30)	391 (35)	312 (28)
	Tape
	233+

Example 20

Preparation of MeFBSE-MDI/Boltron H50

A 125 ml bottle was charged with MeFBSE-MDI (6.0 g, Boltron H50 (1.50 g; previously dried under vacuum), one drop DBTDL, and THF (20 mL; anhydrous tetrahydrofuran). The bottle was heated at 40-60° C. for 1 hr, cooled, and found to contain no isocyanate by FT-IR. Another 0.5 g MeFBSE-MDI was added, the mixture was heated briefly and left overnight.

Examples 21 & 22

MeFBSE-MDI/PVA-17K

PVA-17K (1.80 g) was added to 60 mL NMP at 118° C. and stirred until dissolved, then vacuum was applied, removing approximately 10 mL of NMP. The resulting residue (50.8 g) was divided into two equal portions in dry 125 mL bottles and treated with the amounts of MeFBSE-MDI indicated in the chart for Example 21 and Example 22, 1 drop DBTDL, and heated as Example 20. The products were treated with 80 mL water, collected by filtration and dissolved in THF for testing.

Example 23

MeFBSE-MDI/IOA/HEA/“ELVACITE 1010”

A quart pressure bottle was charged with IOA (123.5 g), HEA (84.5 g), “ELVACITE 1010” (8.7 g; polymethylmethacylate macromonomer; available from Dupont, Wilmington, Del.), 0.43 g “VAZO 67” (0.43 g), EtOAc (277 g), and isopropanol (10 g), purged with nitrogen for 2 minutes and kept 24 hr at 60° C. in a rotating water bath. The procedure described in Example 20 was essentially followed with the exception that 2.5 g of the resulting 40% solution was evaporated to dryness and then redissolved in 10 mL NMP with 3.0 g MeFBSE-MDI.

Example 24

Reaction of MeFBSE-MDI with NH₂(CH₂CH₂NH)₅H

A 4 oz bottle was charged with NH₂(CH₂CH₂NH)₅H (1.16 g; 5 mmole), MeFBSE-MDI (5.0 g; 8.24 mmole) and toluene (40 g) and heated at 70° C. for 5 hrs. FT-IR Analysis indicated no —NCO remained.

Example 25

MeFBSE/TPEG 730

The procedure described for Example 20 was essentially followed with the exception that TPEG 730 (2.43 g) was substituted for Boltron H50 and 6.35 g of MeFBSE-MDI was used.

Example 26

MeFBSE-MDI/SD 890

The procedure described for Example 20 was essentially followed with the exception that SD 890 (0.90 g) was substituted for Boltron H50 and 1.22 g of MeFBSE-MDI was used.

Example 27

MeFBSE-MDI/MA/HEA

A 125 mL bottle was charged with MA (7.0 g methyl acrylate), HEA (3.0 g), tert-dodecylmercaptan (0.10 g), “VAZO 67” (30 mg), isopropanol (15 g), and EtOAc (15 g), purged for 40 sec with nitrogen, and kept in a rotating water bath at 60 C for 24 hours. 5.0 g of the resulting polymer solution was evaporated to dryness and then dissolved in 20 mL dry THF and treated with 4.3 g MeFBSE-MDI and 1 drop DBTDL and heated at 55° C. for 20 hr.

Example 28

MeFBSE-MDI/ODA/HEA

A 125 mL bottle was charged with ODA (7.6 g), HEA (2.6 g), tert-dodecylmercaptan (0.10 g), “VAZO 67” (30 mg), isopropanol (15 g), and EtOAc (15 g), purged for 40 sec with nitrogen, and kept in a rotating water bath at 60° C. for 24 hours. 5.0 g of the resulting polymer solution was evaporated to dryness and then dissolved in 20 mL dry THF and treated with 2.2 g MeFBSE-MDI and 1 drop DBTDL and heated at 55 C for 20 hr.

Example 29

MeFBSE-MDI/Polyglycidol

A solution of 5.0 g glycidol (available from Aldrich) in 100 mL CH₂Cl₂was treated with 35 mg (CF₃SO₂)₂CH₂(35 mg in about 2 mL CH₂Cl₂; available from 3M, St Paul). The mixture was allowed to stand overnight at room temperature, forming an oily precipitate. The solvent was stripped using a rotary evaporator, leaving a sticky resin (4.7 g). NMR (nuclear magnetic resonance) spectroscopy indicated a mixture of primary (linear polymer) and secondary (branched polymer) alcohols. 4.25 g of the resin was dissolved in THF (27.8 g; slight solubility) and NMP (20 g). 5.0 g of this was reacted with 3.3 g MeFBSE-MDI as in Example 20.

TABLE 3


Examples 20-29; Amounts of Materials used and
Resulting Advancing and Receding Contact Angles (°)

			Advancing/
			Receding
	MeFBSE-MDI		Contact Angles (°)

Example	(g)	Reactant (g)	Water	Oil

20	6.5		1.5 g Boltron	126/95	80/63
			H50
			20 ml THF
21	11.4		0.90 g PVA-17K	145/99	85/59
			24 g NMP
22	8.4		0.90 g PVA-17K	123/83	73/62
			24 g NMP
23	3.0		2.5 g	131/82	82/52
			IOA/HEA/
			Elvacite 1010
24	5.0	g	1.16 g	154/105	93/19
			H₂N(C₂H₄NH)₅H
25	6.35		2.43 g TPEG	123/74	79/68
			730
			20 ml THF
26	1.22		0.90 g SD 890	128/86	79/57
27	4.3		5.0 g MA/HEA	128/88	83/59
28	2.0		5.0 g	131/81	82/59
			ODA/HEA
29	3.3		0.40 g	130/86	83/42
			polyglycidol

The referenced descriptions contained in the patents, patent documents, and publications cited herein are incorporated by reference in their entirety as if each were individually incorporated.
Various modifications and alterations to this invention will become apparent to those skilled in the art without departing from the scope and spirit of this invention. It should be understood that this invention is not intended to be unduly limited by the illustrative embodiments and examples set forth herein and that such examples and embodiments are presented by way of example only with the scope of the invention intended to be limited only by the claims set forth herein as follows.

Claims

1. A fluorochemical compound comprising the reaction product of:

(a) the reaction product of:

(i) at least one fluorochemical alcohol represented by the formula:

C_nF_2n+1—X—OH

wherein:

n=1 to 6,

R=hydrogen or an alkyl group of 1 to 4 carbon atoms,

m=2 to 8,

R_f=C_nF_2n+1,

y=0 to 6,

q=1 to 8; and

(ii) at least one unbranched symmetric diisocyanate, and

(b) at least one co-reactant comprising two or more functional groups that are capable of reacting with an isocyanate group.

2. The fluorochemical compound of claim 1 wherein n=1 to 5.

3. The fluorochemical compound of claim 2 wherein n=4.

4. The fluorochemical compound of claim 1 wherein X is

5. The fluorochemical compound of claim 1 wherein the fluorochemical alcohol is C₄F₉SO₂NCH₃(CH₂)₂OH.

6. The fluorochemical compound of claim 1 wherein the unbranched symmetric diisocyanate is 4,4′-diphenylmethane diisocyanate.

7. The fluorochemical compound of claim 1 wherein the co-reactant comprises two or more -Z-H groups, wherein each Z is independently selected from the group consisting of O, N, and S.

8. The fluorochemical compound of claim 7 wherein Z is O or N.

9. The fluorochemical compound of claim 1 wherein the co-reactant is a polyol.

10. The fluorochemical compound of claim 1 wherein the co-reactant is a polyamine.

11. The fluorochemical compound of claim 1 wherein the co-reactant is a polythiol.

12. A fluorochemical compound comprising the reaction product of:

(a) at least one fluorinated isocyanate represented by the following general formula:

C_nF_2n+1—X—OC(O)NH-A-NCO

wherein:

n=1 to 6,

R=H or an alkyl group of 1 to 4 carbon atoms,

m=2 to 8,

R_f=C_nF_2n+1,

y=0 to 6,

q=1 to 8, and

A=an unbranched symmetric alkylene group, arylene group, or aralkylene group; and

13. The fluorochemical compound of claim 12 wherein n=1 to 5.

14. The fluorochemical compound of claim 13 wherein n=4.

15. The fluorochemical compound of claim 12 wherein X is

16. The fluorochemical compound of claim 12 wherein A is

17. The fluorochemical compound of claim 12 wherein the co-reactant comprises two or more -Z-H groups, wherein each Z is independently selected from the group consisting of O, N, and S.

18. The fluorochemical compound of claim 17 wherein Z is O or N.

19. The fluorochemical compound of claim 12 wherein the co-reactant is a polyol.

20. The fluorochemical compound of claim 12 wherein the co-reactant is a polyamine.

21. The fluorochemical compound of claim 12 wherein the co-reactant is a polythiol.

22. A coating composition comprising a solvent and the fluorochemical compound of claim 1.

23. The coating composition of claim 22 wherein the coating composition is a release coating.

24. A coating composition comprising a solvent and the fluorochemical compound of claim 12.

25. An article comprising a substrate having one or more surfaces coated with the coating composition of claim 22.

26. The article of claim 25 wherein the substrate is a hard substrate or a fibrous substrate.

27. An article comprising a substrate having one or more surfaces coated with the coating composition of claim 24.

28. The article of claim 27 wherein the substrate is a hard substrate or a fibrous substrate.

29. A method for making a fluorochemical compound comprising:

(a) reacting at least one fluorochemical alcohol with at least one unbranched symmetric diisocyanate to form a fluorinated isocyanate, the fluorochemical alcohol being represented by the formula:

C_nF_2n+1—X—OH

wherein:

n=1 to 6,

R=hydrogen or an alkyl group of 1 to 4 carbon atoms,

m=2 to 8,

R_f=C_nF_2n+1,

y=0 to 6,

q=1 to 8; and

(b) reacting the fluorinated isocyanate with at least one compound comprising two or more functional groups that are capable of reacting with an isocyanate group.

30. A method for making a fluorochemical compound comprising: reacting (a) at least one compound comprising two or more functional groups that are capable of reacting with an isocyanate group, and (b) at least one fluorinated isocyanate represented by the formula:

C_nF_2n+1—X—OC(O)NH-A-NCO

wherein:

n=1 to 6,

R=H or an alkyl group of 1 to 4 carbon atoms,

m=2 to 8,

R_f=C_nF_2n+1,

y=0 to 6,

q=1 to 8, and

A=an unbranched symmetric alkylene group, arylene group, or aralkylene group.