Patent ID: 6756438
Filing Date: 2004-06-29
Classification: C08F,Y10S

Abstract:
A two-stage process for making a vinyl ethylene carbonate emulsion copolymer which comprises emulsion polymerizing vinyl ethylene carbonate, ethylene, and at least one other ethylenically unsaturated monomer selected from the group consisting of vinyl acetate, vinyl chloride, a C1 to C12 alkyl acrylate, a C1 to C12 alkyl methacrylate, hydroxyethyl acrylate, and hydroxypropyl acrylate, whereina first stage of the process comprises emulsion polymerizing ethylene and the at least one other ethylenically unsaturated monomer to form a first emulsion copolymer; and a second stage of the process comprises emulsion polymerizing vinyl ethylene carbonate and the at least one other ethylenically unsaturated monomer in the presence of the first emulsion copolymer, to form the vinyl ethylene carbonate emulsion copolymer.