Pretreatment of polymer solution with rubber latices

Claim 1

IN A CONTINUOUS METHOD FOR THE PRODUCTION OF A HIGH IMPACT MOLDING COMPOSITION OF (A) A NON-RUBBERY RESINOUS THERMOPLASTIC POLYMER AND (B) A DIFFEENT POLYMER SELECTED FROM THE GROUP CONSISTING OF NATURAL RUBBER AND ORGANIC SYNTHETIC RUBBERS ARTIFICIALLY PRODUCED BY DEVOLATILIZING AND EXTRUDING A SOLUTION OF (A) IN A VOLATILE SOLVENT, SAID SOLUTION HAVING NOT MORE THAN 80%, BY WEIGHT, OF POLYMER (A), AND A LIQUID DISPERSION OF (B) AT A TEMPERATURE OF BETWEEN ABOUT 110*C. TO ABOUT 245*C. AND AT AN ABSOLUTE PRESSURE OF LESS HAN 200 MILLIMETERS OF MERCURY IN A PERIOD OF LESS THAN ABOUT 5 MINUTES, THE IMPROVEMENT WHICH COMPRISES PRETREATING A MIXTURE OF POLYMERS (A) AND (B), PREVIOUS TO SAID DEVOATILIZATION AND EXTRUSION, AT A TEMPERATURE OF BETWEEN ABOUT 50*C. AND AB OUT 110*C. AND A PRESSURE OF LESS THAN 50 P.S.I. BY HOLDING SAID MIXTURE AT SAID TEMPERATURE AND PRESSURE FOR A PERIOD OF FROM ABOUT 1 MINUTE TO 30 MINUTES, WHILE CONTINUOUSLY SUBJECTING SAID MIXTURE TO A CONTINUAL SUBDIVISION AND RECOMBINATION EFFECTED BY SHEARING SO AS TO PRODUCE A UNIFORM COMPOSITION HAVING BOTH A MICROSCOPIC AND A MACROSCOPIC DISPERSION OF SAID (A) AND (B).