Xerographic phototypesetting system and toner useful therein

Radiation imagery chemistry: process – composition – or product th – Electric or magnetic imagery – e.g. – xerography,... – Post imaging process – finishing – or perfecting composition...

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430106, 430137, G03G 900, G03G 500

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active

050631322

ABSTRACT:
A toner composition and a xerographic process for making lithographic plates using the toner composition is provided. The toner composition can be prepared in the form of a dry powder, a polymeric limited coalescence composition, or an evaporative limited coalescence composition. The toner composition absorbs light in the frequency range of 300 to 450 nm and has a total transmission density of at least about 3 at a stack height of about 10 microns. Positive transparencies are produced with imaged areas formed from the toner composition using conventional photocomposing. The transparencies are then employed for contact exposing of positive-working lithographic plates with light, and the plates are then developed.

REFERENCES:
patent: 4100321 (1978-07-01), Schlesinger et al.
patent: 4661566 (1987-04-01), Pruett et al.
patent: 4788121 (1988-11-01), Moore
patent: 4833056 (1989-05-01), Bhateja et al.
patent: 4855396 (1989-08-01), Wilson et al.
Kitamura et al., "High-Speed Platemaking by Coupling of a Conventional Presensitized Plate and an Electrophotographic Layer", Photographic Science and Engineering, vol. 26, No. 3, May/Jun. 1982.

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