Patent ID: 7238742

Claim:
A method of blending additives with poly(vinyl chloride)-containing matrix resins comprising A) forming an additive-matrix mixture by contacting said poly(vinyl chloride)-containing matrix resins with an aqueous additive system comprising at least one polymeric additive in the form of an emulsion selected from i) acrylic impact modifiers having a shell of Tg of 25° C. or more; and ii) methyl methacrylate-butadiene-styrene modifier having a shell of Tg of 25° C. or more; wherein the polymeric additive is present in amounts from 5 to 70 percent by weight of the additive system; wherein said poly(vinyl chloride)-containing matrix resin is in a form, selected from the group consisting of melt, powder, slurry, and wet cake; and B) drying said additive-matrix mixture.