Patents Represented by Attorney Larry E. Evans

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  • Preparation of spinnable polyamide from dinitrile/diamine/water with metal salt of oxygenated phosphorus compound catalyst
    Patent number: 4490521
    Abstract: The process for manufacturing a spinnable polyamide from a dinitrile, a diamine, water and a catalyst is improved by using as a catalyst a metal salt of an oxygenated phosphorus compound. For example, high quality nylon-6,6 is manufactured by contacting adiponitrile, hexamethylene diamine, water and disodium phosphite at an elevated temperature and pressure.
    Type: Grant
    Filed: October 11, 1983
    Date of Patent: December 25, 1984
    Assignee: The Standard Oil Company
    Inventors: Gerald P. Coffey, Robert C. Sentman, Benedict S. Curatolo