Preparation of impact modifier with improved flammability

Abstract

Provided are a process for making a polymer composition comprising (i) providing a multistage polymer latex by emulsion polymerization in the presence of at least one organo-phosphorus soap, wherein providing the multistage polymer comprises (a) providing a first stage polymer, wherein the first stage polymer comprises polymerized units derived from at least one organo-phosphorus monomers, and (b) providing a final stage polymer, and (ii) isolating the multistage polymer by spray drying or coagulation with one or more divalent cations. Also provided is a process for making a matrix resin composition comprising mixing multistage polymer compositions and a matrix resin.

Dependencies are inferred from the claim text.