Patents Assigned to Sumika Color Company, Ltd.
  • Patent number: 5219903
    Abstract: A pigment master batch suitable for filler-containing polypropylene compositions is provided. This pigment master batch comprises 100 parts by weight of a propylene homopolymer having a melt flow rate of at least 10 g/10 min. and 30-200 parts by weight of a processed pigment prepared by using a metallic salt of a fatty acid, a polyethylene wax or a polypropylene wax as a dispersion medium for pigment. A filler-containing polypropylone composition in which the above pigment master batch is incorporated is superior in dispersibility and balance of properties and can easily be processed into molded articles which are superior in balance of properties such as heat resistance, impact resistance and rigidity.
    Type: Grant
    Filed: March 26, 1991
    Date of Patent: June 15, 1993
    Assignees: Sumitomo Chemical Company, Ltd., Sumika Color Company, Ltd.
    Inventors: Takeshi Fujii, Tatsuyuki Mitsuno, Shinichi Hori, Katsuyasu Fukuda, Yukio Kurioka