Photopolymerizable resin compositions and water-washable photopolymer printing plates

Abstract

Abstract A novel photopolymerizable resin composition consists of (1) 1.26 to 3.78 parts by weight of a monoester of a polyhydric aliphatic alcohol with acrylic or methacrylic acid, (2) as a polymeric binder, an aqueous solution of one part by weight of a partially hydrolyzed polyvinyl acetate having a hydrolysis degree of 95 to 60 mol percent and an average polymerization degree of 300 to 2,000 or one part by weight of a methyl cellulose of an average polymerization degree of 160 having a hydroxylpropoxyl substituent and (3) as a photopolymerization initiator, 1 to 5 percent by weight, based on the total weight of the resin components of the above (1) and (2) constituents, of at least one uranyl salt and 0.0072 to 0.72 percent by weight, on the same basis, of azobisisobutyronitrile. A presensitized plate prepared by coating a metal plate with said photopolymerizable resin composition in a thickness of an order of microns is water washable and can be used to form a relief image. Further, a sheet of said photopolymerizable resin composition having a thickness of 0.1 to 3 mm. is directly used in printing and is water washable when it is exposed to actinic light in contact with a screen negative.

Inventors

• 👤 Yasuyuki Takimoto
• 👤 Toshikazu Yoshikawa
• 👤 Kiyomi Sakurai
• 👤 Yasusi Umeda
• 👤 Yoshiaki Oyabu
• 👤 Takahiro Tsunoda

Bibliographic Details