Positive printing, pressure-sensitive material and method of making it

Claim 1

PROCESS FOR COATING A SUBSTRATE AREA WITH A COATING COMPOSITION TO FORM A PRESSURE-SENSITIVE POSITIVE PRINTING MARKING SURFACE, COMPRISING THE STEPS OF PREPARING A DISPERSION OF A MATRIX MATERIAL IN WATER, PREPARING A SOLUTION OF A TRANSPARENTIZING AGENT IN AN ORGANIC LIQUID IMMISCIBLE WITH WATER AND HAVING A BOILING POINT ABOVE THAT OF WATER BUT BELOW ABOUT 350*F., RAPIDLY STIRRING SAID DISPERSION AND SIMULTANEOUSLY ADDING SAID SOLUTION TO FORM AN OIL-IN-WATER EMULSION, DEPOSITING SAID COATING COMPOSITION ON SAID FLEXIBLE BACKING MATERIAL, EXPELLING FIRST A MAJOR PORTION OF SAID WATER AND FORMING IN THE RESULTING FILM OF SAID MATRIX MATERIAL A MULTIPLICITY OF SMALL POCKETS OF SAID ORGANIC LIQUID, AND THEN EXPELLING SAID ORGANIC LIQUID THEREBY TO FORM MULTITUDINOUS AIRMATRIX INTERFACES WHILE SIMULTANEOUSLY PRECIPITATION OUT SAID TRANSPARENTIZING AGENT IN SAID AR-MATRIX INTERFACES UNIFORMLY DISTRIBUTED THROUGHOUT THE VOLUME OF SAID FILM AND WHICH RANGE IN MAXIMUM DIMENSIONS FROM ABOUT ONE-HALF TO ONE MICRON WITH NMO APPRECIABLE NUMBER EXCEEDING FIVE MICRONS, WHEREBY SAID FILM BECOMES OPAQUE AND LIGHT SCATTERING, SAID TRANSPARENTIZING AGENT BEING A PLASTICALLY DEFORMABLE, COHERSIVE, HIGHLY VISCOUS TO SOLID MATERIAL.