Gelled photopolymer composition and methods of making them

Details Gelled photopolymer composition and methods of making them Gelled photopolymer composition and methods of making them

1975-08-20

1978-02-07

Brammer, Jack P.

Gas separation: apparatus

Solid sorbent apparatus

With programmed, cyclic, or time responsive control means

96 351, 96 86P, 20415914, 20415915, 20415919, 20415923, 260 73R, 260 52, 260837R, 260844, 427 43, G03C 168, C08F 800, C08G 1800

Patent

active

040725294

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 a 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 (1977-07-01), Stevens
patent: 4014854 (1977-03-01), Stevens et al.

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