Glutaric acid based polyester internally plasticized PVC

A process for producing internally plasticized polyvinyl halide particles containing a polyester polymeric plasticizer wherein said polyester polymeric plasticizer is substantially derived from the polyesterification of glutaric acid and a diol or polyol said plasticizer having the formula:

• ##STR2## wherein A is a linear or branched polyol residue having from about 2 to 10 carbon atoms and at least 2 oxy groups at its molecular ends;
• P is 0 or 1 with the proviso that when P is 0, x.sub.1 is hydrogen;
• B is a linear alkylene of 3 carbon atoms or is predominantly present as a linear alkylene of 3 atoms along with minor amounts of linear alkylenes of 2 or 4-10 carbon atoms or a combination thereof;
• X and X.sub.1 independently are hydrogen, or acyl groups derived from monocarboxylic acids having from about 3 to 18 carbon atoms, a linear or branched alcohol or mixture of alcohols having from about 2 to 10 carbon atoms, or a hydroxy-alkyl ester of a saturated hydrocarbon;
• n is an integer of from 1 to about 25 and the average range of molecular weight of said polyester plasticizer is no more than about 5000 said polymerization process comprises
• (A) polymerizing vinyl halide monomer in the presence of said polyester polymeric plasticizer to a vinyl monomer conversion level of at least 50% to form internally plasticized polyvinyl halide particles containing said polyester polymeric plasticizer;
• (B) removing substantially all of the residual vinyl halide monomer from said internally plasticized polyvinyl halide particles;
• and
• (C) drying said internally plasticized polyvinyl halide particles to yield a free flowing dry powder.