Patents Assigned to Tosoh Corp.
  • Polyphenylene sulfide containing covalently bonded chlorine in a reduced amount
    Patent number: 4820801
    Abstract: A highly modified polyphenylene sulfide (hereinafter refer to as "PPS") which contains covalently bonded chlorine in a far less amount than conventional PPS's and is substantially free from ionically bonded chlorine and sodium, is produced by heat-treating a conventional PPS with at least one of organic, sulfur-containing compounds in a solvent capable of dissolving the PPS. Such a PPS is very useful as a coating or encapsulating material for electrical and electronic components, etc.
    Type: Grant
    Filed: October 29, 1986
    Date of Patent: April 11, 1989
    Assignees: Tosoh Corp., Hodogaya Chemical Co., Ltd.
    Inventors: Hiroshi Inoue, Toshikazu Kato, Masaaki Otsuru, Noriaki Emura