Patents Assigned to Kureha Kagaku Kogyo Kubushiki Kaisha
  • Stretched molding composed of calcium sulfite-containing polyethylene composition and a process for the preparation thereof
    Patent number: 4124563
    Abstract: A pervious sheet of a polyolefin composition containing 50-85 wt.% of an inorganic material such as calcium sulfite is disclosed. The calcium sulfite is preferably employed in the form of the crystalline semi-hydrate, with the crystals being in the rectangular form having a short axis of 1-30 .mu. and a long axis of 5-100 .mu.. Also disclosed is a method for the manufacture of these compositions.
    Type: Grant
    Filed: February 14, 1977
    Date of Patent: November 7, 1978
    Assignee: Kureha Kagaku Kogyo Kubushiki Kaisha
    Inventors: Mitsuo Onozuka, Koki Nomoto, Kiichi Endo