Browse Prior Art Database

AN IMPROVED WATERLESS PRINTING MASTER

IP.com Disclosure Number: IPCOM000023436D
Original Publication Date: 1977-Oct-31
Included in the Prior Art Database: 2004-Mar-30
Document File: 2 page(s) / 193K

Publishing Venue

Xerox Disclosure Journal

Abstract

Multiblock copolymers of polydimethylsiloxane and alpha-methyl-styrene have been employed for waterless lithography but the run length of such a master was limited to several hundred offset prints due to an unacceptable increase in back-ground density on the prints and to less than 100 prints, direct mode, due to loss of image (inadequate toner bond).

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XEROX DISCLOSURE JOURNAL

AN IMPROVED WATERLESS PRINTING Proposed Classification

MASTER U.S. Cl. 101/1
Alan B. Amidon tnt. Cl. B4lf

Multiblock copolymers of polydimethylsiloxane and alpha-
methyl-styrene have been employed for waterless lithography
but the run length of such a master was limited to several
hundred offset prints due to an unacceptable increase in back-
ground density on the prints and to less than 100 prints,
direct mode, due to loss of image (inadequate toner bond).

It has been discovered that a 1/2 hour treatment at 225°C
reduces the background buildup and significantly improves the
toner bond such that run lengths of 1000 direct mode prints
can be routinely made. The best toner bond occurs if the toner
is on the master during the thermal treatment but improvement
is also observed if the image is carried out after the thermal
treatment.

Volume 2 Number 5 September/October 1977 33

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                   XEROX DISCLOSURE JOURNAL
34 Volume 2 Number 5 September/October 1977

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