G - Physics – 03 – F
Patent
G - Physics
03
F
96/175, 96/266,
G03F 7/029 (2006.01)
Patent
CA 1129704
ABSTRACT OF THE DISCLOSURE A photopolymerizable composition and photosensitive elements produced therefrom are disclosed. The photopolymerizable composition includes: a) a monomer component, b) a polymer com- ponent, c) a photopolymerization initiator, and (c) an activator. The monomer component contains at least one water soluble, mono- functional unsaturated ethylenic monomer or the combination of such a monomer and at least one polyfunctional unsaturated ethylenic monomer. The polymer component includes a partially saponified water soluble, polyvinyl acetate polymer compatible with the monomer components. The polyvinyl acetate polymer contains both acetyl and hydroxyl groups and has a polymerization degree of from 300-2000. The degree of saponification of the polymer is desirably in the range of 65 to 99 percent. The preferred photopolymerization initiators are acetophenone derivatives such as 2,2-dimethoxy-2-phenyl acetophenone, 2,2-diethoxy-2-phenyl acetophenone, 2,-2-diisopropoxy-2-phenyl acetophenone, benzoin alkyl, aryl, allyl or vinyl ethers, or benzophenone derivatives such as benzophenone, 2-methylbenzo- phenone, 2-methoxybenzophenone or 2,2'-dimethoxybenzophenone, which are compatible with the monomer component and the polyvinyl acetate polymer and are activatable by actinic light. Finally, the activator is a phosphine derivative generally described by the formula: Image wherein any of X, Y and Z are hydrogen, halogen, alkyl, alkoxy, aryl, vinyl, or allyl, although not more than one of X, Y and Z may be hydrogen. It is especially preferred in the practice of the present invention that at least one of X, Y or Z in the phosphine derivative activator component be an aryl group.
335144
Kimoto Koichi
Okai Sakuo
Meredith & Finlayson
Napp Systems (u.s.a.) Inc.
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