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US 5,393,637 AGranted
Photosensitive composition for offset printing comprising a binder, a photosensitive substance and a microgel made from an acrylic resin having carboxyl groups as the emulsifier
AssigneeNippon Paint Co., Ltd.
InventorsKazunori Kanda, Yoshifumi Ichinose, Seiji Arimatsu, Katsuji Konishi, Takakazu Hase
Life of this patent
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Abstract
Disclosed is a photosensitive composition used for offset printing, which provides an offset printing plate with excellent durability and developability. The photosensitive composition comprises: (I) a film-forming binder resin, (II) a photosensitive substance, and (III) a microgel having a particle size of 0.01 to 2.0 .mu. prepared by emulsion polymerization using a polymeric emulsifier having an Sp value of 9 to 16.
Claims5
A photosensitive composition for offset printing which comprises an admixture of:
- (I) 15 to 99% by weight of a film-forming binder resin,
- (II) 1 to 50% by weight of a photosensitive substance, and
- (III) 0.1 to 35% by weight of a three-dimensionally crosslinked microgel having a particle size of 0.01 to 2.0 .mu. prepared by emulsion polymerization using a polymeric emulsifier, based on 100% by weight of the composition, wherein said polymeric emulsifier is acrylic resin containing a carboxyl group as an acidic group, which has an Sp value of 9 to 16, an acid value of 15 to 100 and a hydroxyl group value of 5 to 250.
Dependencies are inferred from the claim text.