C - Chemistry – Metallurgy – 08 – F
Patent
C - Chemistry, Metallurgy
08
F
400/2025, 402/29
C08F 2/22 (2006.01) C08F 214/08 (2006.01)
Patent
CA 1218790
ABSTRACT A process for preparing in aqueous emulsion an interpolymer composition have polymerized therein 86 to 92 mole percent vinylidene chloride, 14 to 8 mole percent of a comonomer mixture of methyl methacrylate and a comonomer selected from the group consisting of acrylonitrile, methacrylic acid and methacrylonitrile in a ratio of the comonomer to methyl methacrylate of from 0.5:1 to 2:1, and 0.5 to 1.0 weight percent itaconic acid, based on weight of vinylidene chloride plus comonomer mixture. The interpolymers are prepared in a three step process wherein the monomer feeding is step-wise reduced for a portion of Step III and a polymerization initiator is added at the same constant rate as in Steps I and II. The process reduces the amount of unreacted mixed monomers remaining after monomer addition is completed and the detrimental results of a large variation in polymer composition particularly from high vinylidene chloride fractions. 28,791B-F
405928
Gibbs Dale S.
Treptow Warren L.
Smart & Biggar
The Dow Chemical Company
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