Patents Assigned to Tokyo Ohka Kogyo, K.K.
  • Process for the production of printing plates
    Patent number: 5645974
    Abstract: Compositions comprising a linear base polymer, an ethylenically unsaturated addition-polymerizable compound and a combination of (A) a 1-benzoyl-1-amino-substituted-1-benzylalkane with (B) an .alpha.-phenyl-.alpha.,.alpha.-dialkoxyacetophenone as photopolymerization initiator are suitable for the production of thick-film printing plates.
    Type: Grant
    Filed: April 22, 1996
    Date of Patent: July 8, 1997
    Assignees: Tokyo Ohka Kogyo, K.K., Ciba-Geigy Corporation
    Inventors: Katsuyuki Ohta, Toshiya Takagi, Toshimi Aoyama
  • Photopolymerizable compositions
    Patent number: 5541038
    Abstract: Compositions comprising a linear base polymer, an ethylenically unsaturated addition-polymerizable compound and a combination of (A) a 1-benzoyl-1-amino-substituted-1-benzylalkane with (B) an .alpha.-phenyl-.alpha.,.alpha.-dialkoxyacetophenone as photopolymerization initiator are suitable for the production of thick-film printing plates.
    Type: Grant
    Filed: April 5, 1995
    Date of Patent: July 30, 1996
    Assignees: Ciba-Geigy Corporation, Tokyo Ohka Kogyo, K.K.
    Inventors: Katsuyuki Ohta, Toshiya Takagi, Toshimi Aoyama