Patents Examined by John C. Blutge
  • Water swellable resin composition
    Patent number: 5026780
    Abstract: A water swellable resin composition comprises a water swellable resin and a medium such as a plasticizer, solvent, resin or resin solution. The resin is an alkali metal salt and/or hydrophilic amine salt of a copolymer of hydrophobic polymer chains having an .alpha.,.beta.-ethylenically-unsaturated group at end thereof and a monomer composed principally of (meth)acrylic acid.
    Type: Grant
    Filed: September 28, 1990
    Date of Patent: June 25, 1991
    Assignee: Dainichiseika Color & Chemicals Mfg. Co., Ltd.
    Inventors: Minoru Takizawa, Michiei Nakamura, Hitoshi Takeuchi, Shigeru Sakamoto, Shojiro Horiguchi