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METHOD OF PREPARING LITHOGRAPHIC PRINTING MASTERS

IP.com Disclosure Number: IPCOM000024234D
Original Publication Date: 1980-Feb-29
Included in the Prior Art Database: 2004-Apr-02
Document File: 2 page(s) / 89K

Publishing Venue

Xerox Disclosure Journal

Abstract

The present disclosure relates to an improved method of producing an image on waterless or two-f hid lithographic masters. Waterless lithographic plates generally consist of an ink-releasing substrate upon which an ink-receptive image area is formed. Typical ink-releasing substrates may include, for example, poly(dimethylsi1oxane) and related silicone materials. One may form an image on such materials either with a toner or by some other suitable imaging technique. For example, toner may be adhered to an uncured silicone substrate and by applying heat the toner is fused at the same time that the ink-releasing substrate is cured, thereby forming a very good bond between the toner image area and the substrate. This results in a waterless lithographic plate of the general type described, for example, in U.S. Patent 4,009,032 by Schank and in Example 1 of U.S. Patent 3,951,063 by Schank. Further, plates thus formed may be subjected to a solvent wash after the thermal cure, whereby the toner is removed to leave a porous, sponge-like image which is ink receptive. Such plates are generally described in U.S. Patent 3,901,151 by Crystal and in Example 2 of U.S. Patent 3,951,063 by Schank.

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CEROX DISCLOSURE JOURNAL

METHOD OF PREPARING LITHOGRAPHIC PRINTING MASTERS U.S. C1. 101/463 John B. Wells

Proposed Classification

Int. C1. B41m 5/00

The present disclosure relates to an improved method of producing an image on waterless or two-f hid lithographic masters.

Waterless lithographic plates generally consist of an ink-releasing substrate upon which an ink-receptive image area is formed. Typical ink-releasing substrates may include, for example, poly(dimethylsi1oxane) and related silicone materials. One may form an image on such materials either with a toner or by some other suitable imaging technique. For example, toner may be adhered to an uncured silicone substrate and by applying heat the toner is fused at the same time that the ink- releasing substrate is cured, thereby forming a very good bond between the toner image area and the substrate. This results in a waterless lithographic plate of the general type described, for example, in U.S. Patent 4,009,032 by Schank and in Example 1 of U.S. Patent 3,951,063 by Schank. Further, plates thus formed may be subjected to a solvent wash after the thermal cure, whereby the toner is removed to leave a porous, sponge-like image which is ink receptive. Such plates are generally described in U.S. Patent 3,901,151 by Crystal and in Example 2 of U.S. Patent 3,951,063 by Schank.

In accordance with the present disclosure, a lithographic plate is prepared comprising a suitable base material such as aluminum or paper having coated thereon an ink-releasing substrate material such as a silicone. In particular, the image is formed in accordance with the present disclosure by typing any desired text on the master prior to curing using a t...