Patents Examined by Arnold D. Anderson
  • Aromatic sulfide/sulfone polymer production
    Patent number: 5134224
    Abstract: According to this invention, improved results in terms of molecular weight and percent yield of aromatic sulfide/sulfone polymers are achieved by the employment of a low level modifying agent within a specific range in the polymerization reaction mixture. The modifying agent employed is a salt of an amino carboxylic acid. The salt can be employed as an already existing salt of an amino carboxylic acid or can be formed in situ by employing either an amino carboxylic acid and a base; or a lactam and a base.
    Type: Grant
    Filed: February 14, 1991
    Date of Patent: July 28, 1992
    Assignee: Phillips Petroleum Company
    Inventors: Afif M. Nesheiwat, Lacey E. Scoggins, Melvin D. Herd