Method for preparing dry planographic plates with plasma

Details Method for preparing dry planographic plates with plasma Method for preparing dry planographic plates with plasma

1980-04-17

1981-09-29

Kimlin, Edward C.

Radiation imagery chemistry: process, composition, or product th

Imaging affecting physical property of radiation sensitive...

Making printing plates

156643, 101456, 101457, 101462, 101466, 204165, 204168, 427 40, 430309, 430329, 430331, G03F 702

Patent

active

042923972

ABSTRACT:
The invention provides a novel planographic printing plate suitable for dry planographic printing without supply of dampening water and a method for the preparation thereof. The inventive printing plate has, on one surface of a base plate, a layer of an organopolysiloxane composed of the areas where fresh surface of the organopolysiloxane is exposed bare as the ink-repellent non-image areas and the areas where the surface of the organopolysiloxane layer has been subjected to the treatment with low temperature plasma to be oleophilic or ink-receptive as the image areas of the printing plate. According to the inventive method, the pattern-wise exposure of the organopolysiloxane layer to the plasma atmosphere is performed by first providing a pattern-wise layer of a plasma resistant protective resist layer on the organopolysiloxane layer followed by the plasma treatment and removal of the resist layer. In an improved embodiment of the invention, a layer of an abrasion-resistant ink-receptive material is provided on the organopolysiloxane layer in the plasma-treated areas so that the durability of the printing plate is remarkably improved. Further, incorporation of a metachromatic substance susceptible to plasma treatment, e.g. a dye subject to color change by the plasma treatment, in the organopolysiloxane or in an undercoating primer layer facilitates determination of the end point of the plasma treatment.

REFERENCES:
patent: 3387991 (1968-06-01), Erchak
patent: 3632386 (1972-01-01), Hurst
patent: 4036136 (1977-07-01), Takagi
patent: 4072769 (1978-02-01), Lidel
patent: 4137365 (1979-01-01), Fletcher
patent: 4225663 (1980-09-01), Ball

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