# US 5,703,170 A · Non-corrosive, low volatiles-containing pressure sensitive adhesive > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 5,703,170 A - Document ID: US5703170A - Status: Granted - Kind: A - Application number: 08/785,253 - Filed: 1997-01-17 - Granted: 1997-12-30 - Earliest claimed: 1996-01-24 - Assignees: Adhesives Research, Inc. - Inventors: Michael J. Zajaczkowski; Barbara A. Stutzman - Web page: https://patentgrep.com/patent/US5703170A ## CPC - C09J 155/005: {Homopolymers or copolymers obtained by polymerisation of macromolecular compounds terminated by a carbon-to-carbon double bond} - C08F 290/044: {Polymers of aromatic monomers as defined in group C08F12/00} - C09J: ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES (preparation of glue or gelatine C09H) - C08F: MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS ## Abstract A novel high performance pressure sensitive adhesive composition is provided comprised of a phase separated graft copolymer comprised of a polymerized acrylic or methacrylic acid ester backbone having grafted thereon pendant polymeric moieties such as polystyrene or poly-alpha-methylstyrene. The average number of carbon atoms present in the ester portion of the backbone ranges from 2.5 to 3.5. The composition is non-corrosive and has a low volatile content. ## Claims ### Claim 1 A normally tacky non-polar monomer-containing phase separated graft copolymer having pressure sensitive adhesive properties comprised of a backbone polymer having a polymeric moiety grafted thereto, comprising the reaction product of (1) at least one A monomer consisting of a monomeric acrylic or methacrylic acid ester of a non-tertiary alcohol, said alcohol having from 1 to 3 carbon atoms, (2) at least one B monomer consisting of a monomeric acrylic or methacrylic acid ester of a non-tertiary alcohol, said alcohol having from 4 to 12 carbon atoms, and (3) a graft polymeric moiety C having a Tg greater than 20.degree. C. selected from the group consisting of poly(alpha-methylstyrene), poly(meth)acrylonitrile, polyvinyltoluene, polystyrene, polyindene, poly(t-butylstyrene), polyethylene, polypropylene, poly(vinyl acetate), poly(lower alkyl)methacrylate, poly(2-oxazoline), poly(meth)acrylamide and poly(N,N-di(lower alkyl)acrylamide); and wherein the weight ratio of said at least one A monomer to said at least one B monomer ranges from about 1:2 to 2:1, and the average number of carbon atoms present in the alcohol portion of the total acrylic or (meth)acrylic acid esters of monomers A and B present ranges from about 2.5 to 3.5, with the proviso that when the molecular weight of the graft polymeric moiety ranges from 2,000 to 13,000 the graft polymeric moiety is present in an amount of up to about 20% by wt., and when the molecular weight of the graft polymeric moiety is greater than 13,000, then the graft polymeric moiety is present in an amount of up to about 30% by wt. ### Claim 2 (depends on 1) The copolymer of claim 1 wherein said graft polymeric moiety is selected from the group consisting of poly(alpha-methylstyrene) and polystyrene. ### Claim 3 (depends on 1) The copolymer of claim 1 wherein said graft polymeric moiety is poly(lower alkyl)methacrylate. ### Claim 4 (depends on 1) The copolymer of claim 1 wherein the molecular weight of said graft is in the range of from 2,000 to 13,000. ### Claim 5 (depends on 1) The copolymer of claim 1 wherein said graft is present in an amount of about 1.5 to 2.5 polymeric moieties per polymeric backbone chain on average. ### Claim 6 (depends on 1) The copolymer of claim 1 wherein the weight ratio of said at least one A monomer to said at least one B monomer is about 1:1. ### Claim 7 (depends on 1) The copolymer of claim 1 wherein said at least one B monomer comprises an ester of acrylic and methyacrylic acid with a non-tertiary alcohol selected from the group consisting of 1-butanol, 1-pentanol, 2-pentanol, 3-pentanol, 2-methyl-1-butanol, 1-ethyl-1-pentanol, 2-methyl-1-pentanol, 3-methyl-1-pentanol, 2-ethyl-1-butanol, 3,5,5-trimethyl-1-hexanol, 3-heptanol, 2octanol, 1-decanol and 1-dodecanol. ### Claim 8 (depends on 1) The copolymer of claim 1 wherein the molecular weight of said graft polymeric moiety is greater than 13,000. ### Claim 9 (depends on 1) The copolymer of claim 1 wherein the A monomer is present in the copolymer in an amount within the range of from about 20 to 65 percent by weight. ### Claim 10 (depends on 1) The copolymer of claim 1 wherein the average number of carbon atoms present in the alcohol portion of the total acrylic or (meth)acrylic acid esters of monomers A and B present in the copolymer is about 3. ### Claim 11 (depends on 2) The copolymer of claim 2 wherein the average number of carbon atoms present in the alcohol portion of the total acrylic or (meth)acrylic acid esters of monomers A and B present in the copolymer is about 3. ### Claim 12 (depends on 4) The copolymer of claim 4 wherein the average number of carbon atoms present in the alcohol portion of the total acrylic or (meth)acrylic acid esters of monomers A and B present in the copolymer is about 3. ### Claim 13 (depends on 9) The copolymer of claim 9 wherein the average number of carbon atoms present in the alcohol portion of the total acrylic or (meth)acrylic acid esters of monomers A and B present in the copolymer is about 3. ### Claim 14 (depends on 1) The copolymer of claim 1 wherein said graft polymeric moiety is poly(meth)acrylonitrile. ### Claim 15 (depends on 1) The copolymer of claim 1 wherein said graft polymeric moiety is polyvinyltoluene. ### Claim 16 (depends on 1) The copolymer of claim 1 wherein said graft polymeric moiety is poly(t-butylstyrene). ### Claim 17 (depends on 1) The copolymer of claim 1 wherein said graft polymeric moiety is selected from the group consisting of polyethylene and polypropylene. ### Claim 18 (depends on 1) The copolymer of claim 1 wherein said graft polymeric moiety is polyvinylacetate. ### Claim 19 (depends on 1) The copolymer of claim 1 wherein said graft polymeric moiety is poly(meth)acrylamide. ### Claim 20 (depends on 1) The copolymer of claim 1 wherein said graft polymeric moiety is poly(N,N-di(lower alkyl)acrylamide).