Gelled photopolymer composition for article in relief

Details Gelled photopolymer composition for article in relief Gelled photopolymer composition for article in relief

1977-04-07

1978-11-07

Brammer, Jack P.

Gas separation: apparatus

Electric field separation apparatus

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

96 86P, 96 87R, 427 43, 20415914, 20415915, 20415919, 20415923, G03C 500, G03C 194, G03C 178

Patent

active

041243897

ABSTRACT:
A negative-working, reversibly gelled composition is disclosed, suitable for use as the photocurable component in a blank for preparation of an article in relief, such as a printing plate. Uncured portions of the composition are removed with an aqueous solution following imagewise modulated exposure of such a blank to actinic radiation. The composition comprises a first organic polymer bearing per molecule, at least one ethylenically unsaturated group which is polymerizable by a free radical source; and a second organic polymer bearing per molecule, at least two Z groups, Z being a primary hydroxyl or mercapto group, with the proviso that when said first organic polymer bears at least two Z groups per molecule, said second organic polymer may be omitted; said Z groups being reacted by contact with a dialdehyde to produce the reversibly gelled composition.

REFERENCES:
patent: 3505257 (1970-04-01), Conte et al.
patent: 3597313 (1971-08-01), Williams et al.
patent: 3658745 (1972-04-01), Merrill et al.
patent: 3699086 (1972-10-01), Moschel et al.
patent: 3740376 (1973-06-01), Wolff et al.
patent: 3801328 (1974-04-01), Takimoto et al.
patent: 3843612 (1974-10-01), Vogel et al.
patent: 3905819 (1975-09-01), Sakurai et al.
patent: 4006068 (1977-02-01), Stevens
patent: 4014854 (1977-03-01), Stevens et al.

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