Patents by Inventor Seizi Wakaki

Seizi Wakaki 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).

  • Stabilizer composition for chlorine-containing polymers and process for preparation thereof
    Patent number: 5133899
    Abstract: Disclosed to a stabilizer composition for a chlorine-containing polymer, which comprises a zeolite type stabilizer; calcium hydroxide or magnesium hydroxide, a metal soap type stabilizer and perchloric acid as indispensable components.The stabilizer composition is obtained by adding a metal soap type stabilizer to a mixture of a zeolite type stabilizer and calcium hydroxide or magnesium hydroxide under attrition to cover the mixture with the metal soap type stabIlizer at a high efficiency, and adding perchloric acid to the covered mixture.In the stabilizer composition of the present invention, the initial discoloration, which is a fatal defect of the conventional zeolite type stabilizer for a chlorine-containing polymer, can be prevented, and a sufficient hydrogen chloride-capturing capacity is exerted and a high heat stability is attained without occurrence of bleeding.
    Type: Grant
    Filed: October 1, 1990
    Date of Patent: July 28, 1992
    Assignee: Mizusawa Industrial Chemicals, Ltd.
    Inventors: Tadahisa Nakazawa, Masahide Ogawa, Shoji Shoji, Seizi Wakaki, Choichi Abe