Production of relief plates and printing plates by a positive-wo

Details Production of relief plates and printing plates by a positive-wo Production of relief plates and printing plates by a positive-wo

1985-04-22

1989-03-28

Brammer, Jack P.

Radiation imagery chemistry: process, composition, or product th

Imaging affecting physical property of radiation sensitive...

Making printing plates

430281, 430326, 430915, 430920, 430922, G03C 702

Patent

active

048163791

ABSTRACT:
Relief plates and printing plates are produced by a positive-working process, using a photopolymerizable layer which contains one or more photopolymerizable, olefinically unsaturated compounds, one or more photoinitiators which can be activated by UV light, and a combination of a phenothiazinium, phenoxazinium, phenazinium or acridinium dye with a mild reducing agent which, on exposure to visible light, is capable of reducing the dye in the excited electronic state. The photopolymerizable layer is exposed imagewise to light having a wavelength longer than 450 nm, and simultaneously or subsequently exposed uniformly to light having a wavelength of from 300 to 420 nm, after which the unpolymerized areas of the layer are removed.

REFERENCES:
patent: 3556794 (1971-01-01), Margerum
patent: 3573922 (1971-04-01), Rust
patent: 3615452 (1971-10-01), Cerwonka
patent: 3627656 (1971-12-01), Miller et al.
Oster et al., J. Amer. Chem. Soc., vol. 79 (1957) pp. 595-598.
Res. Discl., No. 156, Apr. 1977, pp. 65-68, No. 15613, Havant, Hampshire, GB: J. A. Van Allan et al., "Sensitizers for Photocrosslinkable Polymers".
Res. Discl., No. 158, Jun. 1977, p. 70, No. 15868, Havant, Hampshire, GB: R. E. Gilson, "A Reversible Negative Working Litoplate".

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