Method of producing positive polymer images

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96 27E, 96 28, 96 452, 96 86P, 96 87R, 20415918, 20415923, G03C 500, G03C 504, G03C 168

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active

040295052

ABSTRACT:
Positive polymer images are produced on substrates having applied thereto a layer of photopolymerizable composition containing (1) a non-gaseous ethylenically unsaturated compound capable of polymerization by free-radical initiated chain propagation, (2) a dinitroso compound which is a noninhibitor of free-radical polymerization and is photochemically converted by ultraviolet radiation to an inhibitor of free-radical polymerization, and (3) a photoactivatable organic free-radical generating system. These images are produced by imagewise exposing a portion of the photopolymerizable layer through a transparency bearing an opaque image to ultraviolet radiation that converts the dinitroso compound to an inhibitor of free-radical polymerization, exposing a greater portion of the photopolymerizable layer, including the area exposed to the imagewise exposure radiation, to actinic radiation that activates the free-radical generating system but does not convert the dinitroso compound to an inhibitor of free-radical polymerization, whereby a positive polymeric image is formed in the areas not exposed to the imagewise exposure radiation.

REFERENCES:
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patent: 3625696 (1971-12-01), Krauch et al.
patent: 3740224 (1975-06-01), Barzynski et al.
patent: 3953444 (1976-04-01), Singh et al.
B367,305, Mar. 1976, Ciurca et al., 96/54.
Chem. Abstracts, vol. 60, 3121g (1964).
Hartel, Chimia, 19 pp. 116-120 (1965).
Tyudesh et al., Kinetics and Catalysts, (USSR), vol. 6, pp. 175-181 (1965).
Bluhm et al., Nature, vol. 215 pp. 1478-1479 (1967).

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