Polyaspartic acid manufacture

  • US 5,315,010 A
  • Filed: 06/21/1993
  • Issued: 05/24/1994
  • Est. Priority Date: 02/22/1991
  • Status: Expired due to Term
First Claim
Patent Images

1. A method of producing polysuccinimide, comprising the steps(a) introducing powdered L-aspartic acid onto an indirectly heated plate drier;

  • (b) heating the introduced powdered L-aspartic acid to a temperature of at least 370°

    F. to initiate a condensation reaction;

    (c) thereafter elevating the temperature of said L-aspartic acid to at least 440°

    F.; and

    (d) maintaining the temperature at at least the 440°

    F. until at least 80% conversion of L-aspartic acid to polysuccinimide has been achieved.

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