Heat and photosensitive copy sheet

Claim 1

A HEAT-SENSITIVE COPY-SHEET PRODUCT CAPABLE OF UNDERGOING PERMANENT VISIBLE CHANGE ON MOMENTARY CONTACT WITH A HEATED METAL TEST BAR AT A CONVERSION TEMPERATURE WITHIN THE APPROXIMATE RANGE OF 60 TO 150*C. AND OF BEING STABILIZED AGAINST A SAID CHANGE ON SAID CONTACT BY MODERATE EXPOSURE TO ACTINIC RADIATION, SAID PRODUCT CONSISTING OF A COMPOSITE OF A SOURCE SHEET AND A RECEPTOR SHEET COMPONENT IN FACE-TO-FACE CONTACT, SAID RECEPTOR SHEET COMPONENT INCLUDING A SURFACE LAYER COMPRISING A NORMALLY SOLID ORGANIC ACID SALT OF A NOBLE METAL, SAID SOURCE SHEET COMPONENT INCLUDING A SURFACE LAYER COMPRISING AN ORGANIC REDUCING AGENT FOR THE NOBLE METAL IONS, AND AT LEAST ONE OF SAID LAYERS INCLUDING A SOLUBLE SOLID THERMOPLASTIC PHOTOCROSSLINKABLE ORGANIC FILM-FORMING POLYMER MATERIAL WHICH UNDERGOES AN INCREASE IN SOFTENING TEMPERATURE OF AT LEAST ABOUT 10*C. UNDER EXPOSURE TO ACTINIC RADIATION FROM A BH-6 HIGH PRESSURE MERCURY ARC LAMP AT 6 INCHES FOR 2 MINUTES, THE SOFTENING TEMPERATURE BEING DETERMINED WITH THE SAMPLE BETWEEN COVER-GLASSES UNDER A WEIGHT OF 5 GRAMS AND UNDER A UNIFORM RATE OF TEMPERATURE INCREASE OF 1-3*C. PER MINUTE.