Blends containing polystyrene-polyisoprene-polystyrene block copolymers and articles thereof
First Claim
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1. A composition of matter which comprises a blend of A-B-A block copolymers, where the A component of each block copolymer of the blend is polystyrene and the B component is polyisoprene, said blend including:
- A) a first A-B-A block copolymer having an overall number average molecular weight ranging from about 90,000 to about 250,000, wherein the polyisoprene has a number average molecular weight ranging from about 80,000 to about 225,000, the polystyrene block has a number average molecular weight ranging from about 8,000 to about 17,000 and the overall styrene content of the block copolymer ranges from about 10 percent to about 24 percent; and
B) a second A-B-A block copolymer having an overall number average molecular weight ranging from about 60,000 to about 110,000, wherein the polyisoprene has a number average molecular weight ranging from about 30,000 to about 70,000, the polystyrene block as a number average molecular weight ranging from about 12,000 to about 20,000, and the overall styrene content of the block copolymer ranges from about 25 percent to about 50 percent.
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Abstract
Blends of low styrene content polystyrene-polyisoprene-polystyrene block copolymer and high styrene content polystyrene-polyisoprene-polystyrene block copolymer can be used with tackifier resins, plasticizer oil and antioxidants to formulate pressure sensitive adhesives of improved cohesive strength vis-a-vis adhesives formed from the low styrene content polystyrene-polyisoprene-polystyrene block copolymer while maintaining good balance between tack, bonding characteristics and heat resistance.
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Citations
20 Claims
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1. A composition of matter which comprises a blend of A-B-A block copolymers, where the A component of each block copolymer of the blend is polystyrene and the B component is polyisoprene, said blend including:
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A) a first A-B-A block copolymer having an overall number average molecular weight ranging from about 90,000 to about 250,000, wherein the polyisoprene has a number average molecular weight ranging from about 80,000 to about 225,000, the polystyrene block has a number average molecular weight ranging from about 8,000 to about 17,000 and the overall styrene content of the block copolymer ranges from about 10 percent to about 24 percent; and B) a second A-B-A block copolymer having an overall number average molecular weight ranging from about 60,000 to about 110,000, wherein the polyisoprene has a number average molecular weight ranging from about 30,000 to about 70,000, the polystyrene block as a number average molecular weight ranging from about 12,000 to about 20,000, and the overall styrene content of the block copolymer ranges from about 25 percent to about 50 percent. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20)
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Specification