Claims
- 1. A pressure sensitive adhesive composition comprising
- (1) a block coploymer of ABA configuration wherein A is a copolymer of alpha-methylsytrene and styrene and the B portion of the polymer is a polydiene;
- (2) a diblock copolymer of AB type of an amount from 0 to 20 parts by weight per hundred parts of the ABA triblock copolymer;
- (3) a tackifying resin compatible with block B in the amounat of 10 to 200 parts hundred parts of the ABA block copolymer;
- (4) a reinforcing resin having a higher softening point than the block A in the ABA polymer in the amount of from about 0 to 100 parts per hundred parts of the block ABA block copolymer;
- (5) an extending oil in an amount from 0 to 50 parts by weight per hundred parts by weight of the ABA block copolymer; and
- (6) a stablizer in the amount of 0 to 5 parts per hundred parts by weight of the ABA block copolymer.
- 2. The composition of claim 1 wherein the ABA block has an alpha-methylstyrene to styrene weight ratio of from 2 to 98 to 98 to 2.
- 3. The composition of claim 2 wherein the weight ratio of alpha-methylstyrene to styrene is from about 1.1 to 2.5 to 1.
- 4. The composition of claim 1 wherein the B block is a member selected from the group consisting of polyisoprene, polybutadiene and a copolymer of butadiene and isoprene.
- 5. The composition of claim 1, where in the ABA block copolymer the weight ratio of the A block to the B block is from about 10 to 90 to 45 to 55.
- 6. The composition of claim 5 wherein the weight ratio of the A block to the B block in the ABA copolymer is from about 15 to 85 to about 30 to 70.
- 7. The composition of claim 1 wherein the tackifying resin is selected from the group consisting of rosin ester resins, polyterpenes, polydipentenes, polypinenes, dihydrogenated resins, glycerol esters of hydrogenated rosin, pentaerythritol esters of hydrogenated rosin.
Parent Case Info
This application is a continuation-in-part of copending application Ser. No. 693,391 filed Jan. 22, 1985, which is a continuation-in-part of Ser. No. 608,626 filed May 9, 1984, both now abandoned.
US Referenced Citations (4)
Foreign Referenced Citations (1)
Number |
Date |
Country |
2348923 |
Apr 1974 |
DEX |
Continuation in Parts (2)
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Number |
Date |
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Parent |
693391 |
Jan 1985 |
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Parent |
608626 |
May 1984 |
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