Patents Assigned to Ryo-Nichi Co., Ltd.
  • Process for the suspension polymerization of vinyl chloride
    Patent number: 4464517
    Abstract: A batch suspension of vinyl chloride is processed in a reaction zone with external cooling zone wherein the volume ratio of total monomer charge to water is more than 0.8 and dispersing agent is 0.03 to 0.1% based on monomers. Circulation of reaction mixture to cooling zone is initiated after conversion of monomer is at least 20%.
    Type: Grant
    Filed: October 31, 1981
    Date of Patent: August 7, 1984
    Assignee: Ryo-Nichi Co., Ltd.
    Inventors: Tetsuya Makino, Masakatsu Itazawa, Kenzi Ogura
  • Vinyl chloride -EPDM resin compositions
    Patent number: 4021508
    Abstract: This invention relates to a vinyl chloride resin composition excellent in weather resistance and impact resistance. More particularly, the invention pertains to a weather resistant and impact resistant vinyl chloride resin composition low in cost and markedly improved in processability which comprises a vinyl chloride resin and a vinyl chloride graft copolymer prepared according to a specific process by graft-copolymerizing a vinyl chloride monomer on an ethylene-propylene-diene copolymer.
    Type: Grant
    Filed: July 7, 1975
    Date of Patent: May 3, 1977
    Assignee: Ryo-Nichi Co., Ltd.
    Inventors: Kakusaburo Nakanishi, Tatsuro Yoshida, Kyoku Nakatubo
  • Process for producing vinyl chloride graft copolymers
    Patent number: 3978162
    Abstract: A process for producing a vinyl chloride grapht copolymer, wherein vinyl chloride is graft polymerized onto an ethylene-propylene-diene copolymer to produce a vinyl chloride graft copolymer containing 10 to 60% by weight of the ethylene-propylene-diene copolymer, carried out in the form of suspension polymerization in aqueous phase in the presence of an aliphatic alcohol of not less than 8 carbon atoms.
    Type: Grant
    Filed: July 7, 1975
    Date of Patent: August 31, 1976
    Assignee: Ryo-Nichi Co., Ltd.
    Inventors: Kakusaburo Nakanishi, Tatsuro Yoshida