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Blends containing polystyrene-polyisoprene-polystyrene block copolymers and articles thereof

  • US 5,358,783 A
  • Filed: 12/17/1993
  • Issued: 10/25/1994
  • Est. Priority Date: 08/11/1989
  • Status: Expired due to Term
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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