Planographic printing master

Details Planographic printing master Planographic printing master

1973-04-13

1977-04-12

Coughenour, Clyde I.

Printing

Planographic

Lithographic plate making, and processes of making or using...

96 33, 96 363, 101150, 1014011, 101453, 427262, 427373, 427387, B41N 114, B41C 110

Patent

active

040168140

ABSTRACT:
A novel printing master and method for producing the same is disclosed which comprises the coating of a suitable substrate with an uncured silicone gum composition containing an activating proportion of a "blowing" or "foaming" agent. A particulate image pattern such as a toner image pattern, is transferred to the uncured silicone layer, followed by curing of the gum to an elastomeric ink releasable film. Activation of the "blowing" agent occurs during curing of the silicone to cause imagewise "foaming" of the silicone layer. After removal of the deposited image pattern, a "foamed" image is formed which is ink receptive and provides an imaged printing master suitable for use without a need for aqueous dampening solutions to provide ink release in non-imaged areas of the master.

REFERENCES:
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patent: 2910351 (1959-10-01), Szpak et al.
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patent: 3215527 (1965-11-01), Johnson
patent: 3246148 (1966-04-01), De Troeyer et al.
patent: 3368483 (1968-02-01), Storms
patent: 3391637 (1968-07-01), Reynolds et al.
patent: 3644014 (1972-02-01), Hirschberg
patent: 3650797 (1972-03-01), Tomanek
patent: 3677178 (1972-07-01), Gipe
patent: 3682633 (1972-08-01), Curtin
patent: 3698312 (1972-10-01), Muller
patent: 3703362 (1972-11-01), Dustin
The Journal of Photographic Science, vol. 18, No. 1, Jan.-Feb. 1970, pp. 4-7, Uhlig.

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