Preparation of anhydride copolymers

  • US 4,789,724 A
  • Filed: 10/17/1986
  • Issued: 12/06/1988
  • Est. Priority Date: 10/17/1986
  • Status: Expired due to Term
First Claim
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1. A method for preparing highly pure anhydride copolymers comprising:

  • providing at least two individually synthetized and purified diacids,reacting the individual diacids and acetic anhydride separately to form mixed anhydrides of the invididual diacids,separately removing the unreacted acetic anhydride and diacids from the individual mixed anhydrides formed by the reaction of the acetic anhydride with said diacids,combining said individual mixed anhydrides, andpolymerizing said mixture of the purified mixed anhydrides of the individual diacids to form copolymers.

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