# US 5,703,169 A · Non-corrosive, low volatiles-containing pressure sensitive adhesive

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- Number: US 5,703,169 A
- Document ID: US5703169A
- Status: Granted
- Kind: A
- Application number: 08/590,603
- Filed: 1996-01-24
- 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/US5703169A

## 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 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,
(3) said graft is a polymeric moiety having a Tg greater than 20.degree. C. and a molecular weight ranging from about 2,000 to about 13,000, said polymeric moiety 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, 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, and said graft polymeric moiety is present in an amount up to about 6.5 wt. % based on the total weight of the copolymer.

### Claim 2 (depends on 1)

The copolymer of claim 1 wherein said graft polymeric moiety is poly(alpha-methylstyrene).

### 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 said graft is present in an amount of about 1.5 to 2.5 polymeric moieties per polymeric backbone chain on average.

### Claim 5 (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 6 (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-methyl-1-pentanol, 2-methyl-1-pentanol, 3-methyl-1-pentanol, 2-ethyl-1-butanol, 3,5,5-trimethyl-1-hexanol, 3-heptanol, 2-octanol, 1-decanol and 1-dodecanol.

### Claim 7 (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 8 (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 9 (depends on 1)

The copolymer of claim 1 wherein said graft polymeric moiety is poly(meth)acrylonitrile.

### Claim 10 (depends on 1)

The copolymer of claim 1 wherein said graft polymeric moiety is polyvinyltoluene.

### Claim 11 (depends on 1)

The copolymer of claim 1 wherein said graft polymeric moiety is poly(t-butylstyrene).

### Claim 12 (depends on 1)

The copolymer of claim 1 wherein said graft polymeric moiety is selected from the group consisting of polyethylene and polypropylene.

### Claim 13 (depends on 1)

The copolymer of claim 1 wherein said graft polymeric moiety is polyvinylacetate.

### Claim 14 (depends on 1)

The copolymer of claim 1 wherein said graft polymeric moiety is poly(meth)acrylamide.

### Claim 15 (depends on 1)

The copolymer of claim 1 wherein said graft polymeric moiety is poly(N,N-di(lower alkyl)acrylamide).

### Claim 16 (depends on 1)

The copolymer of claim 1 wherein said graft polymeric moiety is polystyrene.