Composition and method for impregnation of sheet materials with synthetic resin latices utilizing coagulants of water-soluble amine or quaternary ammonium salts

Claim 1

A PROCESS FOR PREPARING SHEET MATERIALS CAPABLE OF BEING STIFFENED COMPRISING PREPARING AN AQUEOUS LATEX CONSISTING ESSENTIALLY OF (1) 20% TO 60% BY WEIGHT OF A VINYL POLYMER, (2) 0.5% TO 5% BY WEIGHT OF SAID VINYL POLYMER OF A NON-IONIC DISPERSING AGENT WHICH IS SOLUBLE IN WATER AT SOME TEMPERATURE FROM ABOUT ROOM TEMPERATURE TO ABOUT 40*C. AND IS SUBSTANTIALLY INSOLUBLE IN WATER AT SOME TEMPERATURE FROM ABOUT 40*C. TO ABOUT 100*C., AND (3) FROM ABOUT 0.5% TO ABOUT 15% BY WEIGHT OF SAID VINYL POLYMER OF A WATER-SOLUBLE SALT FROM THE GROUP CONSISTING OF AMINE SALTS AND QUATERNARY AMMONIUM SALTS, IMPREGNATING A FIBROUS SHEET MATERIAL WITH SAID AQUEOUS LATEX, REMOVING EXCESS LATEX FROM SAID SHEET MATERIAL, HEATING SAID SHEET MATERIAL AT A TEMPERATURE OF 40*C. TO 100*C. UNTIL THE LIQUID LATEX PARTICLES AGGLOMERATE, AND THEREAFTER DRYING THE SHEET MATERIAL.