Gas separation: apparatus – Electric field separation apparatus – Electrode cleaner – apparatus part flusher – discharger – or...
Patent
1975-09-02
1976-06-22
Brammer, Jack P.
Gas separation: apparatus
Electric field separation apparatus
Electrode cleaner, apparatus part flusher, discharger, or...
96 14, 96 28, 96 351, 96 363, 96115R, 20415921, G03G 500, G03G 168, B31B 176
Patent
active
039649075
ABSTRACT:
Disclosed is a method for the preparation of a relief printing master which is based on irradiation of a film of a composition comprising
A. a degradable polymer containing segments characterized by the structural formula ##EQU1## wherein R is H, an alkyl radical of 1 to 6 carbon atoms, a chlorine or fluorine substituted alkyl radical of 1 to 6 carbon atoms or a cyano substituted aliphatic hydrocarbon radical of 1 to 5 carbon atoms, and
B. a photosensitizer which upon exposure to actinic radiation assumes a .sup.3 (n, .pi.*) or a .sup.1 (n, .pi.*) state.
The polymer and photosensitizer combination, which is in the form of a thin film upon a suitable substrate, is exposed in an imagewise manner to actinic radiation to thereby degrade the polymer. Upon such degradation, depressions are formed in the exposed areas thereby rendering the exposed film suitable for use as a relief printing master.
REFERENCES:
patent: 2892712 (1959-06-01), Plambeck
patent: 3558311 (1971-01-01), Delzeme et al.
patent: 3779778 (1973-12-01), Smith et al.
Brammer Jack P.
Jeffers Jerome L.
O'Sullivan James P.
Ralebate James J.
Xerox Corporation
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