Patents Assigned to Mitsubishi Gas Chemcail, Co., Inc.
  • Pressure sensitive copying paper
    Patent number: 4461495
    Abstract: A condensate free from stickiness and exhibiting an excellent initial color-formability when used as color developer of pressure sensitive copying paper can be obtained by reacting p-hydroxybenzoic acid and one p-alkyl-substituted phenol or a mixture of two or more p-alkyl-substituted phenols with formaldehyde in the presence of an acid catalyst and then directly taking out the condensate into cold water without any procedure such as dehydration, concentration, etc.
    Type: Grant
    Filed: July 8, 1982
    Date of Patent: July 24, 1984
    Assignees: Mitsubishi Paper Mills, Ltd., Mitsubishi Gas Chemcail, Co., Inc.
    Inventors: Yukiya Nakasato, Atsuo Kuramoto, Sadao Morishita, Shigetoshi Hiraishi