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Multiphase block and graft copolymers comprising a hydrophilic continuous phase and hydrophobic domains

  • US 4,130,517 A
  • Filed: 03/21/1977
  • Issued: 12/19/1978
  • Est. Priority Date: 01/29/1973
  • Status: Expired due to Term
First Claim
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1. A water swollen gel composition which consists of:

  • (a) a thermoplastic block copolymer having an average molecular weight of at least 10,000, said block copolymer having the general formula XB--[AB]n --yA wherein n is an integer ≧

    1, X and y are 0 or 1, and y is 1 when n is 1, A is a thermoplastic hydrophobic polymer block having a softening point of at least about 35°

    C. and a molecular weight of at least about 2,000, and B is a thermoplastic hydrophilic polymer block having a molecular weight of at least 6,000 which comprises from about 30-97 wt. % of said copolymer; and

    (b) about 30 to about 98 wt. % of water based on the water swollen gel.

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