Patents Assigned to New Oji Paper Company Limited
  • Heat sensitive recording material
    Patent number: 5753588
    Abstract: The present invention provides a heat sensitive recording material comprising a substrate and a recording layer thereon incorporating a colorless or light-colored basic dye and a color acceptor, the recording material being characterized in that, the basic dye comprises an indolyldiazaphthalide derivative of the formula (1), and the color acceptor comprises a diphenyl sulfone derivative of the formula (2) and/or a benzanilide derivative of the formula (3) ##STR1## wherein R.sub.1 to R.sub.8 are defined in the specification.
    Type: Grant
    Filed: July 25, 1996
    Date of Patent: May 19, 1998
    Assignee: New Oji Paper Company Limited
    Inventors: Takeshi Iida, Tatsuya Meguro, Tetsuo Tsuchida