WO2002097003A1

WO2002097003A1 - Pressure-sensitive adhesive compositions, method for the preparation and use thereof

Info

Publication number: WO2002097003A1
Application number: PCT/FR2002/001822
Authority: WO
Inventors: Jean-Marc Frances; Luc Delchet; Claude Araud; Lucile Gambut
Original assignee: Rhodia Chimie
Priority date: 2001-05-30
Filing date: 2002-05-30
Publication date: 2002-12-05
Also published as: FR2825368A1

Abstract

The invention relates to a pressure-sensitive solvent-free composition which can be hardened radically based on: (a) at least one silicone resin Re, (b) at least one silicon rubber Go which has a viscosity of over 100 000 mPa.s and which is terminally functionalized with at least one hydroxy,acrylate, and/or vinyl group, (c) a diluent Di which has a viscosity of less than 100 mPa.s and (d) an effective amount of an initiator Am which can be activated by means of UV and/or electron beam treatment.

Description

Pressure sensitive adhesive silicone compositions, process for their preparation and their uses.

The present invention relates to pressure-sensitive silicone-based and solvent-free adhesive compositions, as well as methods of preparing and using these compositions which are capable of curing radically under UN treatment. and / or electron beam.

Silicone-based compositions are known to make surfaces adherent. In this regard, it is often necessary to apply these silicone coatings in the form of solutions in a solvent in order to reduce their viscosity and thus make these compositions usable in coating applications. The solvent does facilitate spreading of the coating, however, this is not satisfactory since it is then necessary to evaporate the solvent in question, which requires a great deal of energy consumption. In addition, its evaporation poses environmental problems and in particular problems linked to discharges into the atmosphere; this necessitates the removal and recovery of the solvent, thereby resulting in considerable equipment and energy cost.

There is therefore a definite need for adhesive compositions without solvent and capable, however, of being easily spread on a support. The absence of solvent in these compositions lowers the amount of energy necessary for the curing of the latter and limits the need for anti-pollution equipment. This objective is achieved by the invention which relates to new silicone compositions curable in pressure-sensitive adhesives, commonly called PSA.

Another essential objective of the invention is to provide crosslinkable and / or polymerizable compositions by the radical route under UN treatment. and / or under an electron beam and not requiring heat treatment. Another objective of the invention is to provide compositions which can be used both in a thin layer and in a thick layer.

These various objectives are now achieved by the invention which relates to an adhesive composition sensitive to pressure and solvent-free, curable comprising:

• (a) at least one silicone resin Re containing: D at least one pattern R ¹ ₃ Si0 ₁₂ (I), D and at least one tetrafunctional pattern Sî0 _4/2 and / or a trifunctional pattern

in which :

-R and R ² , identical or different, are monovalent radicals chosen from alkyl radicals preferably lower in Cι_6, alkenyl radicals and hydroxy radicals;

(b) at least one Go silicone gum with a viscosity greater than 100,000 mPa.s, and preferably greater than 200,000 mPa.s, and functionalized at the chain end (s) with at least one acrylate group and / or vinyl and preferably hydroxy,

(c) 1 to 50% by weight of a diluent of silicone nature with a viscosity of less than 100 mPa.s based on at least one silicone Di comprising: D at least one unit of formula (II):

Z If R ³ O (3-a) / 2

(H)

^• in which:

- a = 0, 1 or 2,

- R ³ , identical or different, represents an alkyl, cycloalkyl, aryl, vinyl, alkoxy radical, preferably a lower alkyl C- _j -Cg,

Z, identical or different, is an organic substituent comprising at least one reactive acrylate, acrylamide and / or alkenyl ether function,

(d) and an effective amount of initiator Am which can be activated by treatment under UN and / or treatment under electron beam chosen from at least one compound corresponding to one of the following formulas (III) to (VI):

formula (III) ^R in which:

- when n = 1, Ar ^ represents an aryl radical containing from 6 to 18 carbon atoms, a tetrahydronaphthyl, thienyl, pyridyl or furyie radical or a phenyl radical carrying one or more substituents chosen from the group consisting of F, Cl, Br, CN, OH, linear or branched C-1-C12 alkyls. -CF ³ , -OR ⁶ , -OPhenyl, -SR ⁶ , -SPhenyl, -Sθ2Phenyl, -COOR ⁶ , -O- (CH ₂ -CH = CH ₂ ), -O (CH2H ₄ -O) _m -H, -O (C ₃ H ₆ O) _m -H, m being between 1 and 100, - when n = 2, Ar _j represents an arylene radical in CQ-C-] 2 OR a phenylene-T-phenylene radical, where T represents -O-, -S-, -SO2- or -CH2-,

- X represents a group -OR? or -OSiR8 (R9) 2 OR forms, with R ⁴ , a group -O-CH (R ¹⁰ ) -,

- R4 represents a linear or branched C- | -Cg alkyl radical unsubstituted or bearing a group -OH, -OR ⁶ , acyloxy C2-C8, -COOR ⁶ , -CF ³ , or

-CN, an alkenyl radical in C3 or C4, an aryl radical in Cg to C-] g. a C7 to C8 phenylalkyl radical,

- R5 has one of the meanings given for R ⁴ or represents a radical -CH2CH2 ^ 1, or also forms with R ⁴ , an alkylene radical in C2-C8 or an oxa-alkylene or aza-alkylene radical in C3-Cg,

- R *> represents a lower alkyl radical containing from 1 to 12 carbon atoms,

- R ⁷ represents a hydrogen atom, an alkyl radical in CJC-J2. a C2-Cg alkyl radical bearing a group -OH, -OR ⁶ or -CN, an alkenyl radical in C3-Cg, a cyclohexyl or benzyl radical, a phenyl radical optionally substituted by a chlorine atom or an alkyl radical linear or branched in C-ι-C-12. or a tetrahydropyrannyl-2 radical,

- R ** and R ⁹ , identical or different, each represent a C1-C4 alkyl radical or a phenyl radical, - R ^{1 1} represents a hydrogen atom, a Cj-Cg alkyl radical or a phenyl radical,

- R ¹¹ represents a radical -CONH ₂ , -CONHR ⁶ , -CON (R ⁶ ) ₂ , -P (O) (OR ⁶ ) ₂ or pyridyl-2;

Ar ² f] _R 15 formula (IV) ° in which:

- Ar ^ has the same meaning as Ar ^" ! Of formula (III) in the case where n = 1, R ^" I5 represents a radical chosen from the group consisting of an Ar ² radical, a - (C≈O) -Ar ² radical, a linear or branched C-ι-C- | 2 alkyl radical _> a cycloalkyl radical in Cg-C-1.2 and a cycloalkyl radical forming a ring -C-C- | 2 ^with ^e carbon of the ketone or a carbon of the radical Ar ^2, which radicals may be substituted by one or more substituents selected from the group consisting of -F, -Cl, -Br, -CN, -OH, - CF3 ,, -OR ⁶ , -SR ⁶ , -COOR ⁶ , linear or branched CjC alkyl radicals optionally carrying a group - OH, -OR ⁶ and / or -CN, and linear or branched C- | -Cg alkenyl radicals;

in which :

- Ar3 has the same meaning as Ar ^ of formula (III) in the case where n = 1,

- R ¹⁶ , identical or different, represent a radical chosen from the group consisting of an Ar ³ radical, a - (C = O) -Ar ³ radical, a linear or branched C- | -C- | 2 alkyl radical _> a Cg-C- | 2 cycloalkyl radical _> these radicals which may be substituted with one or more substituents chosen from the group consisting of -F, -Cl, -Br, -CN, -OH, -CF3, -OR ⁶ , -SR ⁶ , - COOR ⁶ , linear or branched CjC- | 2 alkyl radicals optionally carrying a group -OH, -OR ⁶ and / or -CN, and linear or branched alkenyl radicals in C- _| -Cg;

formula (VI)

in which :

- R ⁵ , identical or different, have the same meanings as in formula (III), - Y, identical or different, represent X and or R ⁴ ,

- Z represents:

^• a direct link,

^• a C- | -Cg divalent alkylene radical, or a phenylene, diphenylene or phenylene-T-phenylene radical, or alternatively forms, with the two substituents R ⁵ and the two carbon atoms carrying these substituents, a cyclopentane or cyclohexane ring,

^• a divalent group -OR ¹² -O-, -O-SiR ⁸ R ⁹ -O-SiR ⁸ R ⁹ -O-, or -O-

SiR ⁸ R ⁹ -O-, - R ^{l 2} represents a C2-Cg alkylene, C-4-Cg alkenylene or xylylene radical.

- and Ar ⁴ has the same meaning as Ar ^" ! of formula (III) in the case where n = 1.

In the case where the composition to be crosslinked and / or polymerized contains absorbent pigments in the UN range, a radical initiator Am will be selected having a maximum absorption in the visible range.

In the case of use for the manufacture of transparent silicone adhesive under UN activation, a radical initiator Am will be chosen whose absorption maximum is superimposable with the emission lines of the lamp UN. examples of initiating compounds, the following products will in particular be mentioned:

9-xanthenone; 1-4 dihydroxyanthraquinone; anthraquinone;

2-methylanthraquinone; 2,2'-bi (3-hydroxy-1, 4-naphthoquinone);

2-6 dihydroxyanthraquinone; 1-hydroxycyclohexylphenylketone; 1.5 dihydroxyanthraquinone; 1, 3-diphenyl-1, 3-propanedione;

5,7-dihydroxyflavone; dibenzoylperoxide; 2-benzoylbenzoic acid;

2-hydroxy-2methylpropiophenone; 2-phenylacetophenone;

2,4,6-trimethylbenzoyldiphenylphosphine oxide; anthrone; bi (2,6 dimethylbenzoyl) -2,4,4-trimethylpentylphosphine oxide; poly [, 1,4-benzenedicarbonyl-alt-bis (4-phenoxyphenyl) methanone];

Preferably, the initiator compound (s) will be chosen from the group consisting of: 4,4'dimethoxybenzoin; phenanthrenequinone;

2-ethylanthraquinone; 2-methylanthraquinone; 1, 8-dihydroxyanthraquinone; dibenzoylperoxide;

2,2-dimethoxy-2-phenylacetophenone; benzoin;

2-hydroxy-2methylpropiophenone; benzaldehyde;

4- (2-hydroxyethoxy) phenyl- (2-hydroxy-2-methylpropyl) ketone;

benzoyl acetone;

CH— π-OC ₂ H ₅ ^{w υ} , and their mixture.

As examples of commercial products of initiator compounds, mention may be made of the products sold by the company CIBA-GEIGY: Irgacure 369, Irgacure 651, Irgacure 907, Darocure 1173, etc. The initiator compounds used in the compositions of the invention can be implemented, as they are obtained at the end of their preparation process, for example in solid or liquid form or in solution in a suitable solvent or in a diluent Di and / or Do.

According to a first variant concerning the diluent, the silicone Di is preferably of the oligomer or polymer type.

According to a second variant, the silicone Di comprises at least two silicon atoms.

This silicone Di can be chosen from a large number of silicones carrying at least one reactive function Z. These functions Z can in particular be chosen from the following radicals:

• c - C COO - [ ^• 0-CH ₂ -CH ₂ - • ococ c =: CH ₂

H, H, H

it's coo

H:: c-

H o. CH, -CH, • OCO— g - CH ₂ H

8 - COO - [• 0-CH ₂ -CH ₂ -] - - oco- C = CH,

H

CH,

with 1 <n <100 and 2 <m> 100.

- (CH,) _ - O - CH = CH,

- (CH ₂ ) ₃ - 0-C =: CH R 'with R' representing a linear or branched C _η -Cg alkyl radical. By way of examples, the silicone Di can be based on species whose average formulas a) to f) are given below with R being a hydrocarbon radical of 1 to 15 carbon atoms, or an oxyalkyl group of 1 has 15 carbon atoms and has <100.

at)

- -If (CH ₃ ) ₃

with a + b <100 b)

vs

d)

(OCH, CH ₂ ) 0-R-

e)

f) CH,

(CH ₃ ) ₃ Si-d - Si-0

CH,

According to a third variant concerning the diluent, the latter can comprise a species of organic nature Do which can be advantageously combined with silicone Di. In this case, the amount by weight of diluent of silicone nature is preferably higher than that of diluent of organic nature.

Among these organic species Do having diluent properties, mention will be made of those carrying at least one acrylate, alcohol and / or acid function.

For the acrylate organic diluents, the following compounds may be mentioned, for example: bisphenol-A-epoxydiacrylate; acrylo-glycero-polyester obtained from glycerol and polyester, pentaerythritoltriacrylate (PETA), trimethylol propane triacrylate (TMPTA), 1, 6-hexanediol diacrylate (HDODA), trimethylolpropane ethoxylate triacrylate, tetraethylene glycol diacrylateprop) (TREGDA), triethylene glycol diacrylate (TREGDA), trimethylpropane trimethacrylate (TMPTMA), acrylo-urethanes, acrylopolyethers, acrylopolyesters, unsaturated polyesters, and acryloacrylics, ethylhexyl acrylate,

2-ethoxyethyl acrylate, lauryl acrylate, stearyl acrylate, isobornyl acrylate, acrylates. epoxidized soybean oil, 1, 4 butanedioldiacrylate, neopentylglycoldiacrylate, Pisododecylacrylate, hydroxyethylacrylate, hydroxyethylmethacrylate, and the compound of formula below:

For organic alcohol diluents, mention may in particular be made of polyols; and by way of example the following compound:

For the alkenyl ether organic diluents, the following compounds may be mentioned, for example: dodecylvinyl ether (DDVE), cyclohexylvinyl ether (CVE), butanedioldivinyl ether (BDVE), butanediolmonovinyl ether (HBVE), cyclohexanedimethanol divinyl ether divinyl ether divinyl ether divinyl ether divinyl ether divinyl ether divinyl ether divinyl ether divinyl ether divinyl ether divinyl ether divinyl ether) (CHMVE), triethylene glycol divinyl ether (DVE-3), and 1,4-cyclohexane dimethanol divinyl ether (CHVE).

The composition according to the invention may also contain a stabilization additive based on primary, secondary or tertiary amine; this amine is preferably chosen from the derivatives described in patent application WO98 / 07798.

In general, the adhesive composition according to the invention is prepared by mixing (i) the resin Re, (ii) the silicone gum Go in solution, (iii) the diluent Di, and (iv) optionally the initiator Am. After this first step, the solvent is removed by devolatilization. The initiator Am is then added if it is not present in the initial mixture.

The silicone adhesive composition can be applied to various types of supports by any of the known spreading methods, for example by scraping, engraving, brushing, spraying and indirect roller coating. As support, mention may be made, for example, of paper, glass, metals, plastics or any other support based on synthetic and / or fibrous material. Once the support has been selected and coated with the desired thickness of composition according to the invention, the crosslinking and / or polymerization is carried out by UN treatment. and / or under an electron beam. Advantageously, the curing of the adhesive silicone composition can be carried out in the presence of oxygen if the duration of the treatment under ONE. and / or electron beam is greater than 1/10 of a second. In general, the desired coating thickness is of the order of 0.1 μm to 100 μm in a thin layer and of the order of 100 μm to 10 cm in a thick layer.

After crosslinking and / or polymerization of the compositions according to the invention on a support, the adhesives obtained which are sensitive to pressure can be combined with non-adhesive supports with respect to said adhesive and thus form so-called self-adhesive complexes. Adhesive protective papers such as labels, decorative papers, adhesive tapes are in particular produced from this type of complex. Other types of PSA adhesives can be developed; for example, adhesive tapes for electrical insulation, for electronic circuits, adhesive tapes to protect ends of electric cables or adhesive tapes to mask areas exposed to a plasma spraying of metals or carbides at high temperature.

Examples. The examples below illustrate certain advantages of the compositions according to the invention.

I. Preparation of the crosslinkable PSA1 composition.

A pressure sensitive adhesive composition for micaceous tape is obtained by preparing a resin in a reactive diluent medium.

A silicone resin of the MQ type with a molar ratio M / Q = 60/40 in toluene at 60% is mixed with a silicone rubber with D patterns of viscosity 1 million mPa.s and hydroxylated at the chain ends with a rubber / 0.89 resin (ie 65% resin in solution for 35% gum) 24 parts by weight of silicone diluent b) are added to 100 parts by weight of this mixture b) where a = 13. The toluene is removed in vacuo 20 mm / Hg at 70 ° C with stirring for one hour.

The resin obtained contains 28 to 30% of diluent b) and has a viscosity at 20 ° C of about 20,000 mPa.s. After devolatilization, 2.5 parts by weight of an Am initiator are added _! compound at 50% by weight of hydroxy-cyclohexyl phenyl ketone and 50% by weight of benzophenone (= Irgacure 500 from the company CIBA)

The PSA1 composition is thus obtained. II. Preparation of the crosslinkable PSA2 composition.

10% by weight of diluent cyclohexanedimethanoldivinyl ether is added to the composition PS1. The viscosity measured is 2000 mPa.s.

After devolatilization, 2.5 parts by weight of initiator Am, are added. The PSA2 composition is thus obtained.

III. Tests on micaceous paper or polyester film.

1. Application of these formulations on micaceous paper and polyester film.

The compositions are applied to the Meyer 2 bar on micaceous paper or on polyester film to obtain a coating 10 micrometers thick.

The compositions coated on the supports are then crosslinked and / or polymerized under different irradiation conditions from a scrolling of the coated support on a conveyor, the carpet of which scrolls under two mercury vapor lamps (UV bench with IST arc lamp of 2 Hg - 80W / cm, sold by the company IST).

2. Assessment of adhesiveness.

The adhesiveness or tack is measured by characterizing the force necessary to separate the support coated with a crosslinked and / or polymerized adhesive composition and a support opposite, such as a steel or glass plate. After crosslinking-polymerization, the tack for each of the coatings obtained is measured at different speeds of travel of the support under the UN lamp. Coatings are thus obtained having a low, medium or high tack.

Claims

A pressure-sensitive, solvent-free, cationically curable adhesive composition comprising:

• (a) at least one silicone resin Re containing at least one pattern R ¹ ₃ Si0 ₁₂ , and at least one tetrafunctional pattern Si0 ₄₂ and / or a trifunctional pattern R SiOw where R ¹ and R ² , identical or different, are monovalent radicals chosen from alkyl radicals, akenyl radicals and hydroxy radicals,

(C) 1 to 50% by weight of a silicone diluent of viscosity less than 100 mPa.s based on at least one Di silicone comprising:

D at least one unit of formula (II):

Z If R ³ a O ^w (3-a) / 2

(II) in which:

- a = 0, 1 or 2,

(d) and an effective amount of initiator Am activatable under UN and / or under an electron beam chosen from at least one compound corresponding to one of the following formulas (III) to (VI):

formula (III) ^R in which:

- when n = 1, Ar ^" ! represents an aryl radical containing from 6 to 18 carbon atoms, a tetrahydronaphthyl, thienyl, pyridyl or furyl radical or a phenyl radical bearing one or more substituents chosen from the group consisting of F, Cl, Br, CN, OH, linear or branched alkyls

C-ι-Ci2 _> -CF ³ , -OR ⁶ , -OPhenyl, -SR ⁶ , -SPhenyl, -Sθ2Phenyl,

-COOR ⁶ , -O- (CH ₂ -CH = CH ₂ ), -O (CH ₂ H ₄ -O) _m -H, -O (C ₃ H ₆ O) _m -H, m being between 1 and 100

- when n = 2, Ar-j represents an arylene radical in C -C- | 2 or a phenylene-T-phenylene radical, where T represents -O-, -S-, -SO2- or -CH2-,

- X represents a group -OR ⁷ or -OSiR ⁸ (R ⁹ ) 2 or forms, with R ⁴ , a group -O-CH (R ¹⁰ ) -, - R4 represents a linear or branched C1-Cg alkyl radical not substituted or bearing a group -OH, -OR ⁶ , C2-Cg acyloxy, -COOR ⁶ , -CF ³ , or -CN, a C3 or C4 alkenyl radical, a Cg to C- aryl radical _| g, a C 7 to C 8 phenylalkyl radical,

- R ⁵ has one of the meanings given for R ⁴ or represents a radical -CH2CH2R ^{1 1} , or also forms with R ⁴ , an alkylene radical in C2-Cg or an oxa-alkylene or aza-alkylene radical in C3-C9 ,

- R ⁶ represents a lower alkyl radical containing from 1 to 12 carbon atoms,

- R ⁷ represents a hydrogen atom, an alkyl radical in CjC ^, an alkyl radical in C2-Cg carrying a group -OH, -OR ⁶ or -CN, an alkenyl radical in C3-Cg, a cyclohexyl radical or benzyl, a phenyl radical optionally substituted by a chlorine atom or a linear or branched C1-C12 alkyl radical, or a tetrahydropyrannyl-2 radical,

- R ** and R ⁹ are the same or different and each represents a C-1-C4 alkyl radical or a phenyl radical,

- R ^ O is a hydrogen atom, an alkyl radical in C _j C₆ alkyl or phenyl radical,

_Ar 2 r] _R 15 formula (IV) ° in which:

- Ar ² has the same meaning as Ar ¹ of formula (III) in the case where n = 1, - R ^{l 5} represents a radical chosen from the group consisting of an Ar ² radical, a - (C = O) -Ar ² radical, a linear or branched C1-C12 alkyl radical. a Cg-Ci2 cycloalkyl radical and a cycloalkyl radical forming a Cg-Ci2 ring with the carbon of the ketone or a carbon of the Ar ² radical, these radicals being able to be substituted by one or more substituents chosen from the group consisting of -F , -Cl, -Br, -CN, -OH, - CF3 ,, -OR ⁶ , -SR ⁶ , -COOR ⁶ , linear or branched C1-C 2 alkyl radicals optionally bearing an -OH group, - OR ⁶ and / or -CN, and linear or branched C1-C8 alkenyl radicals;

R ¹⁶

Ar ³ R ¹⁶ formula (V) ° o in which:

- Ar ³ has the same meaning as Ar ^ of formula (III) in the case where n = 1,

- R ¹ **, identical or different, represent a radical chosen from the group consisting of an Ar ³ radical, a - (C = O) -Ar ³ radical, a linear or branched C1-C12 alkyl radical, a radical C -Ci2 cycloalkyl _> these radicals which may be substituted by one or more substituents chosen from the group consisting of -F, -Cl, -Br, -CN, -OH, -CF3, -OR ⁶ , -SR ⁶ , - COOR ⁶ , linear or branched C1-C12 alkyl radicals optionally carrying a group -OH, -OR ⁶ and / or -CN, and linear or branched alkenyl radicals in Cι ~ Cg;

formula (VI)

in which :

- R **, identical or different, have the same meanings as in formula (III), - Y, identical or different, represent X and or R ⁴ ,

- Z represents:

^• a direct link,

^• a divalent C- | -Cg alkylene radical, or a phenylene, diphenylene or phenylene-T-phenylene radical, or alternatively forms, with both substituents R ^ and the two carbon atoms carrying these substituents, a cyclopentane or cyclohexane ring,

^• a group divide -OR ¹² -O-, -O-SiR ^δ R ⁹ -O-SiR ⁸ R ⁹ -O-, or -O-

SiR ⁸ R ⁹ -O-, - R ^" ! ² represents a C2-C8 alkylene, C4-C alkenylene or xylylene radical.

- and Ar ⁴ has the same meaning as Ar ^' ' of formula (III) in the case where n = 1.

2. Composition according to the preceding claim, characterized in that the silicone of the diluent Di comprises at least two silicon atoms.

3. Composition according to the preceding claim, characterized in that the Go gum is functionalized at the end (s) of chain (s) with at least one hydroxy group.

4. Composition according to any one of the preceding claims, characterized in that the initiator compound Am is chosen from at least compounds from the group consisting of: 4,4'dimethoxybenzoin; phenanthrenequinone;

2-ethylanthraquinone; 2-methylanthraquinone;

1, 8-dihydroxyanthraquinone; dibenzoylperoxide;

2,2-dimethoxy-2-phenylacetophenone; benzoin;

2-hydroxy-2methylpropiophenone; benzaldehyde; 4- (2-hydroxyethoxy) phenyl- (2-hydroxy-2-methylpropyl) ketone;

benzoyl acetone;

5. Composition according to any one of the preceding claims, characterized in that the silicone diluent Di is chosen from silicone species comprising at least one reactive function Z chosen from the following radicals: (CH ₃ ) ₃ Si-d

with a + b <100

with a <100

CH, CH,

(CH,) ₃ Si-d - Si-0 -Si-0 - -Si (CH ₃ ) ₃

CH,

with a <100

6. Composition according to any one of the preceding claims, characterized in that said composition comprises, in addition to a silicone diluent Di, an organic diluent Do.

7. Composition according to the preceding claim, characterized in that the organic diluent Do is chosen from organic species carrying at least one function an acrylate, alcohol and / or acid function.

8. Coating obtained from a composition according to any one of the preceding claims.

Coating according to the preceding claim, characterized in that the coating is a pressure-sensitive adhesive.

10. Process for the preparation of a pressure-sensitive and solvent-free adhesive silicone coating comprising:

an initial step of mixing the resin Re and the silicone gum Go in solution, the diluent Di, and optionally the initiator Am as defined in claims 1 to 7, a devolatilization step to remove the solvent, a step of adding the initiator Am if the latter is not present in the mixture of the initial step,

a step of spreading on a support, and a step of crosslinking and / or polymerization by treatment under UN. and / or under an electron beam.

11. A method of preparing a pressure-sensitive adhesive coating from a composition according to any one of claims 1 to 7 of the product obtained according to the method of claim 10.

12. Method according to the preceding claim characterized in that the composition is applied to a support chosen from paper, plastic, metal and / or glass supports; and exposed to treatment with UN. and / or under an electron beam.