Process for incorporating additives into polymers and resulting product

Claim 1

IN THE METHOD OF INCORPORATING FINELY DIVIDED ADDITIVES INTO A POLYOLEFIN RESIN THE STEPS WHICH COMPRISE (1) PREPARING A SLURRY COMPRISING (A) AT LEAST ONE ADDITIVE TO BE INCORPORATED INTO A POLYOLEFIN RESIN AND (B) AN ORGANIC SOLVENT FOR THE RESIN, WHICH SOLVENT WILL WET THE ADDIVITE, THE AMOUNT OF ADDITIVE PRESENT IN THE SLURRY BEING GREATER THAN 2% OF THE TOTAL WEIGHT OF THE SLURRY, (2) FORCING THE PREPARED SLURRY THROUGH AN ORIFICE UNDER A PRESSURE FROM ABOUT 5000 TO 8000 P.S.I.G. AND INTO A ZONE OF SUBSTANTIALLY REDUCED PRESSURE HAVING A SUBSTANTIALLY LARGER CROSS-SECTIONAL AREA THAN THAT OF THE ORIFICE WHEREIN THE VELOCITY OF THE SLURRY IS INSTANTANEOUSLY INCREASED SUBSTANTIALLY, SAID ZONE OF REDUCED PRESSURE HAVING IMPACT MEANS SO DISPOSED THEREIN AS TO BE IMPINGED UPON WITH GREAT FORCE BY THE SLURRY OF INCREASED VELOCITY, WHEREBY THE SLURRY IS SUBJECTED TO EXTREME IMPACT, TURBULENCE, CAVITATION AND SHEAR AND THERE IS PROVIDED A SUBSTANTIALLY STABLE SLURRY, AND (3) ADMIXING THE STABLE SLURRY WITH THE POLYOLEFIN RESIN AT ELEVATED TEMPERATURES TO DISSOLVE SUBSTANTIALLY ALL THE POLYOLEFIN RESIN IN THE SOLVENT COMPONENT OF THE SLURRY WHEREBY THERE IS PROVIDED A FLOWABLE COMPOSITION COMPRISED OF THE ADDITIVE, THE SOLVENT, AND THE POLYOLEFIN RESIN SAID COMPOSITION BEING CHARACTERIZED IN THAT THE FINELY DIVIDED ADDITIVE IS SUBSTANTIALLY UNIFORMLY AND THROUGHLY DISPERSED THEREIN.