Encapsulated Chemical Agent Patents (Class 525/936)
  • Method of preparing zinc-modified phenol-aldehyde novolak resins and use as a color-developer
    Patent number: 4165102
    Abstract: A method of making zinc-modified phenol-aldehyde novolak resins for use as a color-developing agent in pressure-sensitive record sheet material involving the addition of certain dry particulate zinc compounds and an ammonium carboxylate to the melted resin. Specifically, a phenol-formaldehyde resin is reacted with zinc oxide or zinc carbonate and ammonium benzoate.
    Type: Grant
    Filed: May 31, 1978
    Date of Patent: August 21, 1979
    Assignee: NCR Corporation
    Inventor: Jerome R. Bodmer
  • Method of preparing zinc-modified phenol-aldehyde novolak resins and use as a color-developing agent
    Patent number: 4165103
    Abstract: A method of making zinc-modified phenol-aldehyde novolak resins for use as a color-developing agent in pressure-sensitive record sheet material involving the addition of certain dry particulate zinc compounds and an ammonium carboxylate to the melted resin. Specifically, a phenol-formaldehyde resin is reacted with zinc oxide or zinc carbonate and ammonium formate.
    Type: Grant
    Filed: May 31, 1978
    Date of Patent: August 21, 1979
    Assignee: NCR Corporation
    Inventor: Jerome R. Bodmer