Photo-thermolytical vesicular

Claim 1

PHOTOGRAPHIC MATERIAL OF THE TYPE CAPABLE OF FURNISHING UPON EXPOSURE TO RADIAITON AND HEAT DEVELOPMENT A RECORED IN THE FORM OF RADIATION SCATTERING DDISCONTINUITIES FORMED WITHIN AN OTHERWISE SUBSTANTIALLY HOMOGENEOUS VEHICLE, SAID VEHICLE COMPRISING A MATERIAL IN THE FORM OF A DRY, WATER-RESISTANT, NON-HYDROSCOPIC FILM, HAVING A PERMEABILITY CONSTANT FOR NITROGEN WITHIN THE RANGE OF 8.6X10**-16 AND 8X10**-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, WATERINSOLUBLE, NON-HYDROSCOPIC, NON-WATER SWELLING, HIGHLY LINEAR THERMOPLASTIC POLYMER SELECTED FROM THE GROUPS CONSISTING OF ADDITION HOMOPOLYMERS AND ADDITION COPOLYMERS OF ETHYLENICALLY UNSATURATED MONOMERS, SAID VEHICLE HAVING DISPERSED THEREIN (1) A LIGHT RADIATION DECOMPOSABLE SOLID AGENT, SAID AGENT BEING CHEMICALLY NONREACTIVE TO SAID VEHICLE AND UPON EXPOSURE DECOMPOSING INTO PRODUCTS WHICH ARE CHEMICALLY NON-REACTIVE TO SAID VEHICLE AND WHICH ON HEAT DEVELOPMENT ARE VOLATILE TO FORM SAID RADIATION SCATTERING DISCONTINUITIES IN SAID VEHICLE; AND (2) A THERMOLYTIC COMPOUND WHICH IS NOT EDCOMPOSED BY THE LIGHT RADIATION TO WHICH SAID LIGHT RADIATION DECOMPOSABLE SOLID AGENT IS SENSITIVE WHICH IS DIFFERENT FROM SAID PHOTOLYTIC COMPOUND AND WHICH UPON HEAT DEVELOPMENT LIBERATES NITROGEN TO AUGMENT FORMATION OF SAID SCATTERING DISCONTINUITIES.