Polysiloxane-grafted copolymer release coating sheets and adhesive tapes

Claim 2

A coated sheet material comprising a flexible sheet and a release coating covering at least a portion of one major surface thereof, said coating comprising a copolymer having a vinyl polymeric backbone with a T g or T m above about -20° C. and having grafted to said backbone monovalent siloxane weight above about 1,000, the number and composition of said grafted moieties in said copolymer being such as to provide said copolymer a surface release value not greater than about 50N/100 mm.

Claim 3

The coated sheet material of claim 1 wherein said copolymer comprises copolymerized repeating A, B and C monomers, as follows, wherein: A is least one free radically polymerizable vinyl monomer; B is at least one polar monomer copolymerizable with A, the amount by weight of B monomer being up to 30% of the total weight of all monomers; and C is a monomer having the general formula X--(Y) n Si(R) 3-m Z m wherein X is a vinyl group copolymerizable with said A and B monomers; Y is a divalent linking group where n is zero or 1; m is an integer of from 1 to 3; R is hydrogen, lower alkyl, aryl, or alboxy: Z is a monovalent siloxane weight above about 1,000 and is essentially unreactive under copolymerization conditions; wherein said monomers are copolymerized to form a polymeric backbone with said C monomer grafted thereto and wherein the amount and composition of C monomer in said copolymer is such as to provide said release composition with a surface release value not greater than about 50N/100 mm.

Claim 4

The coated sheet material of claim 2 wherein said A monomer is selected from the group consisting of styrene, vinyl acetate, vinyl chloride, vinylidene chloride, acrylonitrile, acrylic or methacrylic acid esters of non-tertiary alcohols having from 1 to 18 carbon atoms, and mixtures thereof.

Claim 5

The coated sheet material of claim 3 wherein said non-tertiary alcohol is selected from the group consisting of methanol, ethanol, propanol, isopropanol, butanol, isobutanol, cyclohexanol, benzyl alcohol, dodecanol, hexadecanol, and octadecanol.

Claim 6

The coated sheet material of claim 1 wherein said polymeric backbone is selected from the group consisting of poly(methyl methacrylate), poly(butyl methacrylate), poly(vinyl acetate), partially hydrolyzed poly(vinyl acetate), and poly(octadecyl acrylate).

Claim 7

The coated sheet material of claim 2 wherein said B monomer is selected from the group consisting of acrylic acid, methacrylic acid, itaconic acid, acrylamide, methacrylamide, N,N-dimethylacrylamide, methacrylonitrile, and maleic anhydride.

Claim 8

The coated sheet material of claim 2 wherein said B monomer comprises from about 1% to about 10% of the total weight of said copolymer.

Claim 9

The coated sheet material of claim 2 wherein the X group of said C monomer has the general formula ##STR9## wherein R 1 is a hydrogen atom or a COOH group and R 2 is a hydrogen atom, a methyl group, or a CH 2 COOH group.

Claim 10

The coated sheet material of claim 2 wherein the Z group of said C monomer has the general formula ##STR10## wherein R 3 and R 5 are independently lower alkyl, aryl, or fluoroalkyl, R 4 is alkyl, alkoxy, alkylamino, aryl, hydroxyl, or fluoroalkyl and r is an integer of about 5 to about 700.

Claim 11

The coated sheet material of claim 2 wherein said C monomer has a general formula selected from the group consisting of ##STR11## wherein p is zero or 1 and q is an integer from 2 to 6; ##STR12## wherein p is zero or 1 and q is an integer from zero to 2; ##STR13## wherein q is an integer from 2 to 6 and wherein R" is hydrogen or alkyl; ##STR14## wherein R" is hydrogen or alkyl; and ##STR15## wherein q is an integer from 2 to 6 and wherein R" is hydrogen or alkyl.

Claim 12

The coated sheet material of claim 2 wherein said C monomer has a number average molecular weight of about 1,000 to about 50,000.

Claim 13

The coated sheet material of claim 2 wherein said C monomer has a number average molecular weight of about 5,000 to about 25,000.

Claim 14

The coated sheet material of claim 2 wherein said copolymer contains about 0.01% to about 20% by weight of said C monomer.

Claim 15

The coated sheet material of claim 2 wherein said copolymer contains about 0.01% to about 50% by weight of said B plus said C monomer.

Claim 16

The coated sheet material of claim 1 wherein said flexible sheet is formed of a material selected from lhe group consisting of paper, fabric, film-forming polymer, metal, rubber and ceramic.

Claim 17

The coated sheet material of claim 1 wherein said coating is coated over at least one entire major surface of said flexible sheet.

Claim 18

A roll of pressure-sensitive adhesive coated tape comprising: (a) a flexible backing member; (b) a pressure-sensitive adhesive coating one major surface of said backing member; and (c) a release coating on the opposite major surface of said backing member, said release coating comprising a copolymer having a vinyl polymeric backbone with a T g or T m above about -20° C. and having grafted to said backbone monovalent siloxane polymeric moieties having a number average molecular weight above about 1,000, the number and composition of said grafted moieties in said copolymer being such as to provide said copolymer a surface release value not greater than about 50 N/100 mm.

Claim 19

A roll of pressure-sensitive adhesive coated tape comprising: (a) a flexible backing member; (b) a pressure-sensitive adhesive coating one major surface of said backing member; and (c) a release coating on the opposite major surface of said backing member, said release coating comprising a copolymer having a vinyl polymeric backbone with a T g or T m above about -20° C. and having grafted to said backbone monovalent siloxane polymeric moieties having a number average molecular weight above about 1,000, the number and composition of said grafted moieties in said copolymer being such as to provide said copolymer a surface release value not greater than about 50 N/100 mm.

Claim 20

The roll of pressure-sensitive tape of claim 17 wherein said copolymer comprises copolymerized repeating A, B and C monomers, as follows, wherein: A is at least one free radically polymerizable vinyl monomer; B is at least one polar monomer copolymerizable with A, the amount by weight of B monomer being up to 30% of the total weight of all monomers; and C is a monomer having the general formula X--(Y) n Si(R) 3-m Z m wherein X is a vinyl group copolymerizable with said A and B monomers; Y is a divalent linking group where n is zero or 1; m is an integer of from 1 to 3; R is hydrogen, lower alkyl, aryl, or alkoxy: Z is a monovalent siloxane polymeric moiety having a number average molecular weight above about 1,000 and is essentially unreactive under copolymerization conditions; wherein said monomers are copolymerized to form a polymeric backbone with said C monomer grafted thereto and wherein the amount and composition of C monomer in said copolymer is such as to provide said release composition with a surface release value not greater than about 50N/100 mm.

Claim 21

A tape comprising: (a) a flexible backing member; (b) a pressure-sensitive adhesive coating one major surface of said backing member; and (c) adhered to the pressure-sensitive coating, a release liner comprising a flexible sheet coated over the major surface adhered to the pressure-sensitive coating with a release coating comprising a copolymer having a vinyl polymeric backbone with a T g or T m above about -20° C. and having grafted to said backbone monovalent siloxane polymeric moieties having a number average molecular weight above about 1,000 the number and composition of said grafted moieties in said copolymer being such as to provide said copolymer a surface release value not greater than about 50N/100 mm.

Claim 22

A tape comprising: (a) a flexible backing member; (b) a pressure-sensitive adhesive coating one major surface of said backing member; and (c) adhered to the pressure-sensitive coating, a release liner comprising a flexible sheet coated over the major surface adhered to the pressure-sensitive coating with a release coating comprising a copolymer having a vinyl polymeric backbone with a T g or T m above about -20° C. and having grafted to said backbone monovalent siloxane polymeric moieties having a number average molecular weight above about 1,000 the number and composition of said grafted moieties in said copolymer being such as to provide said copolymer a surface release value not greater than about 50N/100 mm.

Claim 23

The tape of claim 19 wherein said copolymer comprises copolymerized repeating A, B and C monomers, as follows, wherein: A is at least one free radically polymerizable vinyl monomer; B is at least one polar monomer copolymerizable with A, the amount by weight of B monomer being up to 30% of the total weight of all monomers; and C is a monomer having the general formula X--(Y) n Si(R) 3-m Z m wherein X is a vinyl group copolymerizable with said A and B monomers; Y is a divalent linking group where n is zero or 1; m is an integer of from 1 to 3; R is hydrogen, lower alkyl, aryl, or alkoxy; Z is a monovalent siloxane polymeric moiety havaing a number average molecular weight above about 1,000 and is essentially unreactive under copolymerization conditions; wherein said monomers are copolymerized to form a polymeric backbone with said C monomer grafted thereto and wherein the amount and composition of C monomer in said copolymer is such as to provide said release composition with a surface release value not greater than about 50N/100 mm.

Claim 24

The coated sheet material of claim 1 wherein said copolymer is cross-linked.

Claim 25

The roll of tape of claim 17 wherein said copolymer is cross-linked.

Claim 26

The tape of claim I9 wherein said copolymer is cross-linked.

Claim 27

A transfer tape comprising a film of pressure-sensitive adhesive between release liners, at least one of said release liners being coated with a release coating comprising a copolymer having a vinyl polymeric backbone with a T g or T m above about -20° C. and having grafted to said backbone monovalent siloxane polymeric moieties having a number average molecular weight above about 1,000, the number and composition of said grafted moieties in said copolymer being such as to provide said copolymer a surface release value not greater than about 50N/100 mm.

Claim 28

A transfer tape comprising a film of pressure-sensitive adhesive between release liners, at least one of said release liners being coated with a release coating comprising a copolymer having a vinyl polymeric backbone with a T g or T m above about -20° C. and having grafted to said backbone monovalent siloxane polymeric moieties having a number average molecular weight above about 1,000, the number and composition of said grafted moieties in said copolymer being such as to provide said copolymer a surface release value not greater than about 50N/100 mm.

Claim 29

The transfer tape of claim 24 wherein said copolymer comprises repeating A, B and C monomers, as follows, wherein: A is at least one free radically polymerizable vinyl monomer; B is at least one polar monomer copolymerizable with A, the amount by weight of B monomer being up to 30% of the total weight of all monomers; and C is a monomer having the general formula X--(Y) n Si(R) 3-m Z m wherein X is a vinyl group copolymerizable with said A and B monomers; Y is a divalent linking group where n is zero or 1; m is an integer of from 1 to 3; R is hydrogen, lower alkyl, aryl, or alkoxy; Z is a monovalent siloxane polymeric moiety having a number average molecular weight above about 1,000 and is essentially unreactive under copolymerization conditions; wherein said monomers are copolymerized to form a polymeric backbone with said C monomer grafted thereto and wherein the amount and composition of C monomer in said copolymer is such as to provide said release composition with a surface release value not greater than about 50N/100 mm.

Claim 30

The transfer tape of claim 24 wherein said copolymer is cross-linked.

Claim 31

The coated sheet material of claim 1 wherein said release coating comprises a compatible blend of said copolymer with another polymer.