Pressure sensitive transfer system for the production of copies. (Machine-translation by Google Translate, not legally binding)

摘要

Pressure sensitive transfer system for the production of copies, characterized in that it comprises: a paper carrier having first and second faces and having a thickness of approximately 20 to 80 microns, with at least one of said first and second faces second defines a plurality of depressions of a depth of about 10 to 60% of the thickness of the paper carrier, depressions that are spaced apart by distances of about 1 to 50 microns and are separated by projecting areas of said face; a plurality of pigment particles housed within the depressions, pigment particles that are smaller than the size of the depressions, with each of the pigment particles enclosed by a coating comprising a binder preferably with an adhesive power relatively weak, cellulose derivatives or an elastic vinyl polymer, coating constituting approximately 15 to 25% of the weight of the pigment particles; and a transfer inducing layer interposed between said face and a receiving material, transfer inducing layer having a weight of about 1 to 5 grams per square meter of layer, this transfer inducing layer comprises an immobilized gel consisting at least of a polyethylene of a molecular weight averaged from about 1500 to 2000, a melting point of about 80 to 110º C, a viscosity of 140 degrees centigrade of about 100 to 250 cps., a specific gravity of about 0.92 and a penetration hardness from about 0.2 to 4.0 determined with 100 g for 5 seconds at a temperature of 25º C, in accordance with the standard of ASTM-D 1321-57 T in the form of a solid network including a solution of said polyethylene in a liquid solvent, a solution amounting to less than 10% by weight of the solid polyethylene network and containing dissolved polyethylene in an amount of at least 0,7 and not more than 1 , 7% of the weight of the solution included. (Machine-translation by Google Translate, not legally binding)