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Polymers containing pendant acid functionalities and labile backbone bonds

  • US 4,765,973 A
  • Filed: 10/06/1986
  • Issued: 08/23/1988
  • Est. Priority Date: 06/06/1984
  • Status: Expired due to Term
First Claim
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1. A controlled release device which comprises:

  • (A) a polymer selected from the group consisting of polyorthoesters, polyacetals, polyketals, polyesters and polyphosphazenes with at least one labile backbone bond per repeat unit and at least one pendant acid functionality per thousand repeat units; and

    (B) a beneficial substance capable of being released to an aqueous atmosphere incorporated within or surrounded by the matrix of said polymer.

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