Process for incorporating additives

Claim 1

IN A PROCESS FOR INCORPORATING A LIQUID ADDITIVE INTO A SOLID, THERMOPLASTIC POLYMER OF A MONOMER OF THE GROUP CONSISTING OF AN OLEFIN, A MONOVINYLIDENE AROMATIC HYDROCARBON, AN AR-HALO MONOVINYLIDENE AROMATIC HYDROCARBON, AN ALKYL ACRYLATE, AN ALKYL METHACRYLATE, ACRYLONITRILE, METHACRYLONITRILE, AND MIXTURES THEREOF, THE STEPS COMPRISING: MIXING A LIQUID ORGANIC ADDITIVE SELECTED FROM THE GROUP CONSISTING OF LUBRICANTS, PLASTICIZERS, PNEUMATOGENS, FLAME RETRADANTS AND STABILIZERS FOR THE POLYMER WITH A NORMALLY SOLID, THERMOPLASTIC, POLYMERIC DRIER HAVING A STAUDINGER AVERAGE MOLECULAR WEIGHT BELOW ABOUT 35,000, SAID MIXING BEING CONDUCTED AT A TEMPERATURE ABOVE THE MELTING TEMPERATURE OF THE DRIER AND BELOW THE DECOMPOSITION TEMPERATURE OF THE LIQUID ADDITIVE AND THE AMOUNTS OF THE COMPONENTS BEING SELECTED TO FORM A CONCENTRATE SOLUTION CONTAINING ABOUT 40 TO 65 PER CENT BY WEIGHT OF THE LIQUID ADITIVE; COOLING THE CONCENTRATE SOLUTION TO FORM A SOLID; PARTICULATING SAID SOLID CONCENTRATE; AND BLENDING SAID PARTICULATED CONCENTRATE WITH THE SOLID THERMOPLASTIC POLYMER WHICH ADDITIVE BEING COMPATIBLE WITH THE SOLID THERMOPLASTIC POLYMER, AND SAID POLYMERIC DRIER BEING A POLYMER WHICH IS COMPATIBLE WITH THE SOLID THERMOPLASTIC POLYMER AND OF LOWER MOLECULAR WEIGHT THAN SAID SOLID THERMOPLASTIC POLYMER.