Continuous process for preparing vinyl or vinylidene chloride graft polymers of improved solubility

Claim 1

IN THE PROCESS OF PRODUCING GRAFT COPOLYMER BY POLYMERIZING AN ADMIXTUARE OF MONOETHYLENICALLY UNSATURATED POLYMERIZABLE MONOMERIC MATERIAL (A) AND AN AQUEOUS DISPRESION OF A PREFORMED POLYMER OF MONOETHYLENICALLY UNSATURATED POLYMERIZABLE MONOMERIC MATERIAL (B) IN THE PRESENCE OF A PEROXY POLYMERIZATION CATALYST FOR MONOETHYLENICALLY UNSATUREATED POLYMERIZABLE MONOMERIC MATERIAL, THE IMPROVEMENT WHICH COMPRISES PRODUCING A GRAFT COPOLYMER OF IMPROVED SOLUBILITY CHARACTERISTICS BY CONTINUOUSLY AND PROGRESSIVELY BRINGING TOGETHER AT A CONSTANT RATIO (1) SAID MONOMERIC MATERIAL (A), (2) SAID AQUEROUS DISPERSION OF PREFORMED POLYMER OF SAID MONOMERIC MATERIAL (B), AND (3) SAID POLYMERIZATION CATALYST, SAID MONOMERIC MATERIAL (A) AND SAID PREFORMED POLYMER OF MONOMERIC MATERIAL (B) BEING BROUGHT TOGETHER IN A CONSTANT RATIO WITHIN THE RANGE OF 60-95% BY WEIGHT OF SAID MONOMERIC MATERIAL (A) AND CONVERSELY 40-5% BY WEIGHT OF SAID PREFORMED POLYMER, BOTH BASED ON THE COMBINED WEIGHT OF SAID MONOMERIC MATERIAL (A) AND SAID PREFORMED POLYMER, MAINTAINING EACH PORTION OF THE RESULTING POLYMERIZABLE MIXTURE AT A SUBSTANTIALLY CONSTANT TEMPERATURE IN THE RANGE OF 15-75* C. FOR A SUBSTANTIALLY EQUAL TIME, AND CONTINUOUSLY AND PROGRESSIVELY WITHDRAWING THE RESULTING POLYMERIZED MIXTURE AT A SUBSTANTIALLY CONSTANT RATE EQUIVALENT TO THE RATE OF BRINGING TOGETHER OF (1), (2) AND (3), SAID CONTINUOUS AND PROGRESSIVE BRINGING TOGETHER OF (1), (2) AND (3) AND SAID CONTINUOUS AND PROGRESSIVE WITHDRAWING BEING CONTINUED AT A CONSTANT RATE THROUGH THE POLYMERIZATION WHEREBY THE COMPOSITION OF THE MIXTURE BEING POLYMERIZED REMAINS SUBSTANTIALLY UNCHANGED DURING THE POLYMERIZATION, FROM 25 TO 65% BY WEIGHT OF SAID MONOMERIC MATERIAL (A) BEING VINYLIDENE CHLORIDE AND AT LEAST 50% BY WEIGHT OF SAID MONOMERIC MATERIAL (B) HAVING THE FORMULA