Polaroid Corporation

Eugene L Langlais

Anthony C Giudice

Neal F Kelly

Zafarullah K Cheema

Clarence F St Jacques

Tung-Feng Yeh

Rong-Chang Liang

John M Hardin

Yi-Hua Tsao

Joseph Hanlon

Yee-Ho Chia

The present invention is directed to a method for the on-press development and printing of images. The method generally comprises the steps of providing a lithographic printing plate precursor element comprising a lithographic hydrophilic printing plate substrate, a photohardenable photoresist, and a layer of polymeric protective overcoat; imagewise exposing the precursor element to actinic radiation through said photoresist and overcoat layer sufficiently to photoharden the photoresist in exposed regions and provide a latent image in said photoresist layer; placing the precursor element onto a lithographic printing press; and running the press, whereby printing fluid effects removal of the overcoat and development of said latent image. In particular modes of practices, the method utilizes an overcoat having incorporated therein a water or fountain soluble or dispersible crystalline compound. The overcoat can be used as an oxygen barrier and/or to provide a non-tacky surface on the printing plate. By the incorporation of the crystalline compound, on-press removability of the overcoat is facilitated.

On-press development of an overcoated lithographic plate

Disclosed is a laminar thermal imaging medium, actuatable in response to intense image-forming radiation for production of a pair of images upon exposure of the medium and separation of the respective sheets, the medium including a polymeric hardenable adhesive layer which in its unhardened condition reduces the tendency for the laminar thermal imaging medium to delaminate on application of physical stresses to the medium, and which is hardenable to a durable base for one of said images. Also disclosed is a method of preparing a laminar imaging medium as aforedescribed wherein said medium after lamination of component elements thereof is cut into individual units and, thereafter, the hardenable adhesive layer of such units is hardened to a durable base for an image carried thereon.

Method for preparing a laminar thermal imaging medium actuatable in

A lithographic printing plate for use on a printing press, with minimal or no additional processing after photoexposure, comprises a printing plate substrate; a photosensitive hydrophilic layer having a polymeric hydrophilic binder and a photopolymerizable, photocrosslinkable or photorearrangeable compound capable of promoting insolubilization or hardening in areas of photoexposure; and a photosensitive hydrophobic layer having a polymeric hydrophobic binder and a photopolymerizable, photocrosslinkable or photorearrangeable compound capable of promoting insolubilization or hardening in areas of photoexposure.

Printing plate and methods of making and using same

Laminar thermal imaging medium actuatable in response to intense

Printing plate and methods of making and use same

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Norfolk, MA, United States of America

Eugene L Langlais