Method of producing positive polymer images

Details Method of producing positive polymer images Method of producing positive polymer images

1976-05-20

1977-06-14

Brammer, Jack P.

Gas separation: apparatus

Electric field separation apparatus

Electrode cleaner, apparatus part flusher, discharger, or...

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

Patent

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:
patent: 3203801 (1965-08-01), Heiart
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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