Photosensitive material

Claim 1

A PHOTOSENSITIVE MATERIAL FOR USE IN MAKING A MASTER COPY TO BE MADE BY A REFLEX PRINTING PROCESS FROM AN ORIGINAL WITH THE LIGHT SENSITIVE SILVER HALIDE EMULSION COATING IN DIRECT CONTACT WITH THE IMAGE ON THE ORIGINAL DOCUMENT COMPRISING A BASE SHEET THROUGH WHICH LIGHT MAY BE TRANSMITTED, A PHOTOSENSITIVE COATING ON ONE SURFACE OF SAID BASE SHEET MATERIAL FOR DIRECT CONNECT WITH THE IMAGE ON THE ORIGINAL DOCUMENT, SAID PHOTOSENSITIVE COATING PERMITTING THE PASSAGE OF LIGHT THERETHROUGH SO THAT THE LIGHT PASSED THROUGH SAID PHOTOSENSITIVE COATING FROM THE BASE SHEET MATERIAL WILL NOT APPRECIABLY AFFECT THE PHOTOSENSITIVE COATING BUT THE REFLECTED LIGHT FROM THE IMAGE WILL AFFECT THE PHOTOSENSITIVE COATING, A LOOSELY ADHERENT AND PIGMENTED PEELABLE LIGHT DIFFUSING LAYER NOT AFFECTED BY PHOTOGRAPHIC PROCESSING ON THE OTHER SURFACE OF SAID LIGHT TRANSMITTING BASE SHEET, SAID LIGHT DIFFUSING LAYER HAVING SUFFICIENT STRENGTH TO BE READILY PEELABLE FROM THE LIGHT TRANSMITTING BASE SHEET WHEREBY THE PHOTOSENSITIVE COATING MAY BE EXPOSED BY LIGHT WHICH IS PASSED THROUGH SAID LIGHT DIFFUSING LAYER, THROUGH SAID LIGHT TRANSMITTING BASE SHEET, THROUGH SAID LIGHT SENSITIVE COATING AND IS REFLECTED FROM SAID DOCUMENT INTO SAID PHOTOSENSITIVE COATING THEREBY EXPOSING SAID PHOTOSENSITIVE COATING, SAID LIGHT DIFFUSING LAYER INCLUDING A PLASTICIZED ORGANIC SOLVENT SOLUBLE RESINOUS BASE MATERIAL SELECTED FROM THE GROUP CONSISTING OF POLYVINYL CHLORIDE, POLYVINYL ACETATE, COPOLYMERS OF VINYL CHLORIDE AND VINYL ACETATE, POLYVINYL BUTYRAL, ETHYL CELLULOSE, CELLULOSE ACETATE, CELLULOSE ACETATE BUTYRATE, CHLORINATED RUBBER, NITRO CELLULOSE, AND ACRYLIC RESIN, SAID RESINOUS BASE MATERIAL HAVING SUFFICIENT PLASTICIZER TO PREVENT TENACIOUS ADHESION OF THE LIGHT DIFFUSING LAYER TO SAID OTHER SURFACE OF THE BASE SHEET AND SAID PLASTICIZER SERVING TO RENDER THE LIGHT DIFFUSING PEELABLE LAYER OF SUFFICIENT FLEXIBILITY AND STRENGTH TO PROVIDE FOR PEELING OF THE LIGHT DIFFUSING LAYER FROM THE BASE SHEET WITHOUT REQUIRING SPECIAL TREATMENT, SAID LIGHT FROM SAID DOCUMENT BEING REFLECTED BY SAID LIGHT DIFFUSING LAYER WHEREBY SHARP IMAGES ARE FORMED ON SAID MATERIAL.