Article comprising a silicone pressure-sensitive adhesive and a releasable anti-stick layer and process of using same

Claim 2

An article comprising a unitary coherent backing, an organopolysiloxane pressure-sensitive adhesive layer on at least one side of said backing, and a releasable anti-stick layer comprising a cured reactive terminal group containing dimethylpolysiloxane fluid-coated sheet on the organopolysiloxane pressure-sensitive adhesive, said adhesive comprising the intercondensation product of a mixture containing an organopolysiloxane resin and at least one alkylaryl polysiloxane gum.

Claim 3

An article as defined in claim 1 wherein said alkylaryl polysiloxane gum has a viscosity from about 200,000 to about 15,000,000 centipoises at 25° C. and which contains an average from about 1.85 to 2.01 silicon-bonded alkyl and aryl radicals per silicon atom, with the alkyl and aryl radicals being selected from the group consisting of alkyl radicals having from 1 to 8 carbon atoms; cycloalkyl radicals having from 5 to 7 carbon atoms in the ring; lower alkenyl radicals having from 2 to 8 carbon atoms, mononuclear aryl radicals, mononuclear aryl lower alkyl radicals having from 1 to 6 carbon atoms in the alkyl group and halogenated derivatives of the above radicals, the organic radicals being attached to silicon through silicon-carbon linkages and with there being present in the gum from about 2% to about 75% aryl-silicon linkages of the total silicon organic linkages and about 0.001 to 0.25% by weight silicon-bonded hydroxyl groups or alkoxy groups.

Claim 4

An article as defined in claim 1 wherein said reactive terminal group containing dimethylpolysiloxane fluid is selected from the group consisting of a silanol-stopped dimethylpolysiloxane fluid, a dimethylvinyl-stopped dimethylpolysiloxane fluid and a dimethylhydrogen stopped dimethylpolysiloxane fluid.

Claim 5

An article as defined in claim 1 wherein said reactive terminal group containing dimethylpolysiloxane fluid is a silanol-stopped dimethylpolysiloxane.

Claim 6

An article as defined in claim 2 wherein said reactive terminal group containing dimethylpolysiloxane fluid is selected from the group consisting of a silanol-stopped dimethylpolysiloxane fluid, a dimethylvinyl stopped dimethylpolysiloxane fluid and a dimethylhydrogen-stopped dimethylpolysiloxane fluid.

Claim 7

An article as defined in claim 4 wherein said silanol-stopped, dimethylpolysiloxane fluid has a viscosity of from 1,000 to 10,000,000 centipoise.

Claim 8

An article as defined in claim 6 wherein said fluid at 25° C. corresponds to the formula ##STR3## wherein p is a whole number that varies from about 300 to about 5260.

Claim 9

An article as defined in claim 1 wherein the thickness of the organopolysiloxane pressure-sensitive adhesive layer is from about 0.7 to about 5 mils.

Claim 10

An article as defined in claim 1 wherein said coated sheet is comprised of paper.

Claim 11

An article as defined in claim 1 wherein the thickness of said coated sheet is from about 0.02 to about 3 mils.

Claim 12

A process for adherently applying an article coated with an organopolysiloxane pressure-sensitive adhesive to a substrate, said process comprising: a. providing an article comprising a backing, an organopolysiloxane pressure-sensitive adhesive layer on at least one side of said backing, and a releasable anti-stick layer comprising a cured reactive terminal group containing dimethylpolysiloxane fluid-coated sheet on the organopolysiloxane pressure-sensitive adhesive, said adhesive comprising the intercondensation product of a mixture containing an organopolysiloxane resin and at least one alkylarylpolysiloxane gum; b. separating said releasable anti-stick layer from the organopolysiloxane pressure-sensitive adhesive; and c. applying the article containing the organopolysiloxane pressure-sensitive adhesive to a substrate.

Claim 13

A process for adherently applying an article coated with an organopolysiloxane pressure-sensitive adhesive to a substrate, said process comprising: a. providing an article comprising a backing, an organopolysiloxane pressure-sensitive adhesive layer on at least one side of said backing, and a releasable anti-stick layer comprising a cured reactive terminal group containing dimethylpolysiloxane fluid-coated sheet on the organopolysiloxane pressure-sensitive adhesive, said adhesive comprising the intercondensation product of a mixture containing an organopolysiloxane resin and at least one alkylarylpolysiloxane gum; b. separating said releasable anti-stick layer from the organopolysiloxane pressure-sensitive adhesive; and c. applying the article containing the organopolysiloxane pressure-sensitive adhesive to a substrate.

Claim 14

A process as defined in claim 11 wherein said reactive terminal group containing dimethylpolysiloxane is selected from the group consisting of a silanol-stopped dimethylpolysiloxane, a dimethylvinyl-stopped dimethylpolysiloxane and a dimethylhydrogen-stopped dimethylpolysiloxane.

Claim 15

An article as defined in claim 1 wherein said organopolysiloxane resin comprises a cohydrolysis product of a trialkyl hydrolyzable silane and an alkyl silicate.

Claim 16

An article as defined in claim 13 there being employed in said resin from 1 to 2 moles of the alkyl silicate per mole of trialkyl hydrolyzable silane.

Claim 17

An article as defined in claim 1 wherein said organopolysiloxane resin comprises a copolymer of SiO 2 units and (CH 3 ) 3 SiO 1/2 units.

Claim 18

An article as defined in claim 15 there being employed in said resin one mole of SiO 2 per 0.5 to 0.6 moles of (CH 3 ) 3 SiO 1/2 .

Claim 19

An article as defined in claim 15 wherein said mixture of said organopolysiloxane resin and said alkylarylpolysiloxane gum is comprised of from 1 to 1.5 parts by weight of said organopolysiloxane resin per 1 part by weight of said alkylarylpolysiloxane gum.

Claim 20

An article as defined in claim 16 wherein said mixture of said organopolysiloxane resin and said alkylarylpolysiloxane gum is comprised of from 1 to 1.5 parts by weight of said organopolysiloxane resin per 1 part of said alkylarylpolysiloxane gum.

Claim 21

An article comprising a unitary coherent backing, an organopolysiloxane pressure-sensitive adhesive layer on at least one side of said backing, and a releasable anti-stick layer comprising a cured reactive terminal group containing dimethylpolysiloxane fluid-coated sheet on the organopolysiloxane pressure-sensitive adhesive, said adhesive comprising the intercondensation product of a mixture containing an organopolysiloxane resin, a silanol-stopped polysiloxane copolymer gum having a viscosity from about 200,000 to about 15,000,000 at 25° C. comprising diphenylsiloxane and dimethylsiloxane, and a polysiloxane copolymer gum having a viscosity from about 200,000 to about 15,000,000 at 25° C. comprising methylvinylsiloxane, diphenylsiloxane and dimethylsiloxane.

Claim 22

An article comprising a unitary coherent backing, an organopolysiloxane pressure-sensitive adhesive layer on at least one side of said backing, and a releasable anti-stick layer comprising a cured reactive terminal group containing dimethylpolysiloxane fluid-coated sheet on the organopolysiloxane pressure-sensitive adhesive, said adhesive comprising the intercondensation product of a mixture containing an organopolysiloxane resin, a silanol-stopped polysiloxane copolymer gum having a viscosity from about 200,000 to about 15,000,000 at 25° C. comprising diphenylsiloxane and dimethylsiloxane, and a polysiloxane copolymer gum having a viscosity from about 200,000 to about 15,000,000 at 25° C. comprising methylvinylsiloxane, diphenylsiloxane and dimethylsiloxane.

Claim 23

An article as defined in claim 19 wherein said organopolysiloxane resin comprises a copolymer of SiO 2 units and (CH 3 ) 3 SiO 1/2 units.

Claim 24

An article as defined in claim 20, there being employed in said organopolysiloxane resin one mole of SiO 2 per 0.5 to 0.6 moles of (CH 3 ) 3 SiO 1/2 .

Claim 25

An article as defined in claim 20 wherein said reactive terminal group containing dimethylpolysiloxane fluid is selected from the group consisting of a silanol-stopped dimethylpolysiloxane, a dimethylvinyl-stopped dimethylpolysiloxane and a dimethylhydrogen-stopped dimethylpolysiloxane.

Claim 26

An article as defined in claim 21 wherein said reactive terminal group containing dimethylpolysiloxane fluid is selected from the group consisting of a silanol-stopped dimethylpolysiloxane, a dimethylvinyl-stopped dimethylpolysiloxane and a dimethylhydrogen-stopped dimethylpolysiloxane.

Claim 27

An article as defined in claim 20 wherein said mixture of said organopolysiloxane resin, said silanol-stopped polysiloxane copolymer gum and said polysiloxane copolymer gum is comprised of from about 1 to 1.5 parts by weight of said organopolysiloxane resin per 1 part by weight of the total copolymer gum content.

Claim 28

An article as defined in claim 21 wherein said mixture of said organopolysiloxane resin, said silanol-stopped polysiloxane copolymer gum and said polysiloxane copolymer gum is comprised of 1 to 1.5 parts by weight of said organopolysiloxane resin per 1 part by weight of the total copolymer gum content.

Claim 29

A process for adherently applying an article with an organopolysiloxane pressure-sensitive adhesive to a substrate, said process comprising: a. providing an article comprising a backing, an organopolysiloxane pressure-sensitive adhesive layer on at least one side of said backing, and a releasable anti-stick layer comprising a cured reactive terminal group containing dimethylpolysiloxane fluid-coated sheet on the organopolysiloxane pressure-sensitive adhesive, said adhesive comprising the intercondensation product of a mixture containing an organopolysiloxane resin comprised of SiO 2 units and (CH 3 ) 3 SiO 1/2 units, a silanol-stopped polysiloxane copolymer gum having a viscosity from about 200,000 to about 15,000,000 at 25° C. comprising diphenylsiloxane and dimethylsiloxane, and a polysiloxane copolymer gum having a viscosity from about 200,000 to about 15,000,000 at 25° C. comprising methylvinylsiloxane, diphenylsiloxane and dimethylsiloxane; b. separating said releasable anti-stick layer from the organopolysiloxane pressure-sensitive adhesive; and c. applying the article containing the organopolysiloxane pressure-sensitive adhesive to a substrate.

Claim 30

A process for adherently applying an article with an organopolysiloxane pressure-sensitive adhesive to a substrate, said process comprising: a. providing an article comprising a backing, an organopolysiloxane pressure-sensitive adhesive layer on at least one side of said backing, and a releasable anti-stick layer comprising a cured reactive terminal group containing dimethylpolysiloxane fluid-coated sheet on the organopolysiloxane pressure-sensitive adhesive, said adhesive comprising the intercondensation product of a mixture containing an organopolysiloxane resin comprised of SiO 2 units and (CH 3 ) 3 SiO 1/2 units, a silanol-stopped polysiloxane copolymer gum having a viscosity from about 200,000 to about 15,000,000 at 25° C. comprising diphenylsiloxane and dimethylsiloxane, and a polysiloxane copolymer gum having a viscosity from about 200,000 to about 15,000,000 at 25° C. comprising methylvinylsiloxane, diphenylsiloxane and dimethylsiloxane; b. separating said releasable anti-stick layer from the organopolysiloxane pressure-sensitive adhesive; and c. applying the article containing the organopolysiloxane pressure-sensitive adhesive to a substrate.

Claim 31

A process as defined in claim 25 wherein said reactive terminal group containing dimethylpolysiloxane fluid is selected from the group consisting of a silanol-stopped dimethylpolysiloxane, a dimethylvinyl-stopped dimethylpolysiloxane and a dimethylhydrogen-stopped dimethylpolysiloxane.