Copolymer-1 improvements in compositions of copolymers

CAFC
  • US 5,981,589 A
  • Filed: 02/27/1998
  • Issued: 11/09/1999
  • Est. Priority Date: 05/24/1994
  • Status: Expired due to Term
First Claim
Patent Images

1. Copolymer-1 having a molecular weight of about 5 to 9 kilodaltons, made by a process comprising the steps of:

  • reacting protected copolymer-1 with hydrobromic acid to form trifluoroacetyl copolymer-1,treating said trifluoroacetyl copolymer-1 with aqueous piperidine solution to form copolymer-1, andpurifying said copolymer-1, to result in copolymer-1 having a molecular weight of about 5 to 9 kilodaltons.

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