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PROCESS FOR PREPARING PHOTOCtJRABLE WATERLESS LITHOGRAPHIC PRINTING MASTERS

IP.com Disclosure Number: IPCOM000022821D
Original Publication Date: 1976-Feb-29
Included in the Prior Art Database: 2004-Mar-26
Document File: 2 page(s) / 235K

Publishing Venue

Xerox Disclosure Journal

Abstract

It has recently been discovered that if the non~imaged areas of the printing master are formed of an abhesive ink reV- leasing silicone elastomer, ink will not adhere to said elastomer so that a fountain solution or dampening solution is no longer required. One difficulty encountered with these new silicone masters, however, is that it is

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XEROX DISCLOSURE JOURNAL

PROCESS FOR PREPARING Proposed Classification
PHOTOCtJRABLE WATERLESS LITHO-~ u.s. ci. 96/27
GRAPHIC PRINTING MASTERS mt. ci, G03c 5/04

Richard G. Crystal
Frank 3, Walton

It has recently been discovered that if the non~imaged areas
of the printing master are formed of an abhesive ink reV-
leasing silicone elastomer, ink will not adhere to said
elastomer so that a fountain solution or dampening solution
is no longer required. One difficulty encountered with
these new silicone masters, however, is that it is

difficult to image the master unless the silicone is
removed in the imaged areas so as to permit printing from
an underlying substrate, Thus, because the silicone is
abhesive, particulate imaging materials such as toner
cannot be easily adhered to the silicone,

This problem is obviated in accordance with the invention
by preparing an imaged printing master comprising coating
a substrate with a photocurable silicone elastomer gum,
placing over said gum and in contact therewith a surface
material which is transparent to actinic radiation and

suitable for use as a master substrate, subjecting the
resultant member to activating radiation in imagewise
configuration to selectively cure the upper surface of
said silicone in the areas subjected to the radiation such
that it adheres to the surface material, separating the
surface and substrate layers wherein the partially cured
silicone adheres to the surface layer in image configur-~
ation, and curing the silicone on...