Process for coloring polyurethane foams

Claim 1

THE PROCESS OF COLORING A POLYURETHANE FOAM IN WHICH THE CARBON DIOXIDE REQUIRED FOR FORMING THE FOAM IS FORMED BY REACTION OF WATER WITH ISOCYANATE GROUPS, WHICH PROCESS COMPRISES DISPERSING A WATER-CONTAINING ORGANIC PIGMENT FILTER CAKE CONTAINING FROM 10% TO 90% BY WEIGHT OF WATER AND FROM 90% TO 10% BY WEIGHT OF ORGANIC PIGMENT, SAID ORGANIC PIGMENT BEING SELECTED FROM THE GROUP CONSISTING OF AZO PIGMENTS, VAT DYES, COPPER PHTHALOCYANINE AND LAKE PIGMENTS, UNIFORMLY THROUGHOUT A REACTION MIXTURE CONTAINING AN ORGANIC POLYISOCYANATE AND A POLYOL FROM THE GROUP CONSISTING OF TRIHYDRIC ALCOHOLS, POLYALKYLENE ETHER GLYCOLS AND POLYESTERS WHICH ARE THE REACTION PRODUCTS OF AN ALCOHOL FROM THE GROUP CONSISTING OF DIHYDRIC ALCOHOLS AND GLYCEROL AND DICARBOXYLIC ACIDS TO PRODUCE A REACTION MIXTURE CONTAINING SAID PIGMENT, WATER IN AMOUNT SUFFICIENT TO PRODUCE A FOAM OF DESIRED DENSITY AND FROM ABOUT 25 TO ABOUT 225 PARTS OF SAID POLYISOCYANATE PER 100 PARTS OF SAID POLYOL, INTRODUCING SAID MIXTURE INTO A MOLD AND CURING SAID MIXTURE TO PRODUCE THE COLORED POLYURETHANE FOAM OF DESIRED DENSITY.