Polyurethane foam containing inorganic pigment coated with polymeric material

Claim 1

AN ESSENTIALLY OPEN CELLED PLASTIC FOAM COMPOSITION COMPRISING THE WATER-FOAMED POLYMERIZATION PRODUCT OF A LIQUID POLYURETHANE PREPOLYMER HAVING FREE -NCO GROUPS, SAID PREPOLYMER BEING THE REACTION PRODUCT OF AN ARCYLENE DISOCYANATE AND AT LEAST ONE LIQUID POLYOL SELECTED FROM THE GROUP CONSISTING OF A LIQUID LONG CHAIN LINEAR POLUALKYLENE ETHER POLYOL HAVING AN EQUIVALENT WEIGHT OF AT LEAST ABOUT 200, A LIQUID FATTY ACID TRIGYLCERIDE HAVING AN HYDROXYL NUMBER OF AT LEAST 49, AND LIQUID ESSENTIALLY LINEAR SATURATED POLYESTERS HAVING TERMINAL HYDROXYL GROUPS SAID POLYESTERS BEING THE REACTION PRODUCT OF A DIBASIC ACID AND A DIHYDRIC ALCHOL, AND UNIFORMLY DISTRIBUTED THROUGHOUT SAID FOAM ABOUT 5% TO 40% BY WEIGHT OF SUBSTANTIALLY MINUS 44 MICRON PARTICULES OF AN INORGANIC HYDROPHILIC PIGMENT,THE PARTICULES OF WHICH ARE COATED WITH ABOUT 1% TO ABOUT 30% BY WEIGHT OF A WATERSOLUBLE, FILM-FORMING HIGH POLYMER CONTAINING A SUBSTANTIALY LINEAR CONTINOUS CARBON ATOM CHAIN ALONG WHICH ARE DISTRIBUTED NUMEROUS SIDE CHAINS CONTAINING POLAR HYDROPHILIC GROUPS, THE PH OF A 1% AQUEOUS SOLUTION OF SAID POLYMER BEING WITHIN THE RANGE OF ABOUT 4 TO 9.