Coated mineral filler for organic polymers, and method of forming the coated filler

Claim 1

THE METHOD FORMING A MATERIAL SUITABLE AS A FILLER ORGANIC POLYMERS COMPRISING THE STEPS OF MIXING IN WATER PARTICLES OF A MINERAL MATERIAL HAVING A SOLUBILITY LESS THAN 10-3 MOLAR IN WATER TO FORM A SLURRY, ADDING TO THE SLURRY A POLYAMINE HAVING AT LEAST TWO TERMINAL AMINO GROUPS MIXING THE POLYAMINE IN THE SLURRY TO ASSURE DISPERSAL OF THE POLYAMINE, AND COATING OF THE MINERAL PARTICLES WITH THE POLYAMINE, ADDING TO THE SLURRY A SMALL AMOUNT OF AN AQUEOUS EMULSION OF THE ORGANIC POLYMER TO WHICH THE TREATED MINERAL MATERIAL WILL ULTIMATELY BE ADDED AS A FILLER, MIXING SAID SLURRY TO DISPERSE THE EMULSION AND COAT THE POLYAMINE COATED PARTICLES WITH THE ORGANIC POLYAMINE SEPARATING THE COATED MINERAL MATERIAL FROM THE SLURRY BY THE ADDITION OF AN ACIDIC REAGENT, AND DRYING AT A TEMPERATURE BELOW THE DECOMPOSITION TEMPERATURE OF THE ORGANIC POLYMER.