System of photographic reproduction

Claim 1

A RECORD FURNISHING MATERIAL CAPABLE OF FURNISHING A RECORD SOLELY IN THE FORM OF A DISTRIBUTION PATTERN OF RADIATION SCATTERING DISCONTINUITIES FORMED WITHIN A VEHICLE WHICH IS OPTICALLY SUBSTANTIALLY HOMOGENOUS, SAID MATERIAL BEING THE FORM OF A DRY, WATER-RESISTANT, NONHYGROSCOPIC FILM HAVING A PERMEABILITY CONSTANT FOR NITROGEN WITHIN THE RANGE OF 8.6X10-16 AND 8.6X10-10, SAID CONSTANT BEING THE NUMBER OF CUBIC CENTIMETERS OF NITROGEN TRANSMITTED AT 30*C., BY AN AREA OF ONE SQUARE CENTIMETER IN ONE SECOND WHEN THE PRESSURE GRADIENT IS ONE CENTIMETER OF MERCURY PER ONE CENTIMETER OF TRANSMISSION THICKNESS, THE CONTINUOUS PHASE OF SAID FILM BEING ESSENTIALLY A SYNTHETIC, WATER-INSOLUBLE, NON-HYGROSCOPIC, NON-WATER SWELLING, HIGHLY LINEAR THERMOPLASTIC POLYMER SELECTED FROM THE GROUP CONSISTING OF HOMOPOLYMERS OF STYRENE, HOMOPOLYMERS OF VINYL CHLORIDE, HOMOPOLYMERS OF VINYLIDENE CHLORIDE, COPOLYMERS OF VINYL CHLORIDE WITH A DIFFERENT VINYL MONOMER AND COPOLYMERS OF VINYLIDENE CHLORIDE WITH A VINYL MONOMER, AND A SUBSTANTIALLY NON-VOLATILE, ORGANIC MATERIAL WHICH IS COMPATIBLE WITH SAID POLYMER SO THAT SAID FILM IS OPTICALLY SUBSTANTIALLY HOMOGENEOUS, SAID ORGANIC MATERIAL WHICH BEING PRESENT IN SAID FILM ONLY TO THE EXTENT NECESSARY TO GIVE SAID FILM THE AFORESAID PERMEABILITY CONSANT FOR NITROGEN, A LIGHT DECOMPOSABLE SOLID AGENT SUBSTANTIALLY UNIFORMLY DISPERSED IN SAID FILM AS THE SOLE ESSENTIAL IMAGE PRODUCING AGENT, SAID DECOMPOSABLE AGENT ITSELF BEING SUBSTANTIALLY NON-REACTIVE TO SAID VEHICLE AND UPON EXPOSURE TO LIGHT DECOMPOSING INTO PRODUCTS WHICH ARE ALSO CHEMICALLY SUBSTANTIALLY NON-REACTIVE TO SAID VEHICLE AND WHICH SOLELY UPON WARMING ARE VOLATILE TO FORM SAID RADIATION SCATTERING DISCONTINUITIES ONLY IN THE LIGHT STRUCK AREAS IN SAID FILM HAVING THE INDICATED PERMEABILITY TO THEREBY FURNISH SAID RECORD, SAID ORGANIC MATERIAL BEING OTHER THAN THE SELECTED POLYMER AND LIGHT DECOMPOSABLE SOLID AGENT, SAID RECORD FURNISHING MATERIAL BEING OBTAINED BY COMBINING THE COMOPENTS POLYMER, AGENT AND ANY NECESSARY AMOUNT OF SAID ORGANIC MATERIAL IN NON-AQUEOUS ORGANIC SOLVENT FOR SAID COMPONENTS TO FORM A UNIFORM, ESSENTIALLY WATER-FREE MIXTURE THEREOF AND FORMING THE RECORD MATERIAL THEREFROM WITH THE INDICATED PERMEABILITY AND COMPOSITION.