Patents by Inventor Yasuji Tsunekawa

Yasuji Tsunekawa has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Soft polyurethane foam from hydroxyl urethane prepolymer and polyester ether polyol
    Patent number: 4904706
    Abstract: A soft polyurethane foam produced from a polyhydroxy compound, a polyisocyanate, a catalyst, a foam stabilizer, water and/or a blowing agent, the improvement wherein the polyhydroxy compound is[1] a terminal hydroxyl group-containing urethane prepolymer obtained by the reaction of at least one polyol selected from the group consisting of the following (A) to (H) with a polyisocyanate and/or[2] at least one polyo selected from the group consisting of the following (D), (E) and (F):(A) a low-molecular-weight polyhydroxy compound,(B) a polyoxyalkylene polyol,(C) an aromatic ring-containing diol,(D) a polyester ether polyol and optionally a low-molecular-weight polyhydroxy compound and at least one compound selected from aliphatic dicarboxylic acids, aromatic dicarboxylic acids, and anhydrides and derivatives thereof,(E) a polyester ether polyol and optionally a low-molecular-weight polyhydroxy compound and at least one compound selected from aliphatic dicarboxylic acids, aromatic dicarboxylic acids, and anhydrid
    Type: Grant
    Filed: July 19, 1988
    Date of Patent: February 27, 1990
    Assignee: Dainippon Ink and Chemicals, Inc.
    Inventors: Kazuya Uenishi, Yasuji Tsunekawa