Processing aids for poly(vinyl chloride) resins

Claim 1

An improved method for processing a synthetic thermoplastic resin which is the product of the addition polymerization of an olefinically unsaturated monomer wherein particulate resin is admixed with a primary plasticizer and the resulting mixture is fabricated into a finished article, wherein the improvement comprises mixing said resin and primary plasticizer with a composition having as essential ingredients a. at least about 50 weight percent of at least one monoalkyl phenoxy polyethylene glycol having from about 8 to about 12 carbons in the alkyl group thereof and from about 3 to about 7 ethyleneoxy units; b. a minor proportion up to about 25 weight percent of at least one amine or ammonium salt of an organic acid having a vapor pressure of not greater than 1 mm Hg at 20°C selected from the group consisting of monoamine salts of monohydric organic acids of molecular weight of at least 136 and polyethylene polyamide salts of such acids where said polyethylene polyamide has at least 4 ethyleneamine units, there being one acid residue for each amine nitrogen of said polyalkylene polyamine; and c. a minor proportion up to about 25 weight percent of at least one amide having a vapor pressure of not greater than about 1 mm Hg at 20°C selected from the group consisting of N-lower alkyl and N-hydroxy lower alkyl substitued higher amides of from 11 to about 24 carbons and amides of monohydric organic acids of molecular weight of at least 136 and polyethylene polyamines having at least 4 ethyleneamine units, there being one acid residue for each amine nitrogen, said composition being present in an amount of from about 1 to about 10 weight percent, based upon said resin, so as to improve the flow and shear characteristics of said resin during fabrication thereof, and said primary plasticizer being present in an amount of at least 1 weight percent.