C - Chemistry – Metallurgy – 08 – L
Patent
C - Chemistry, Metallurgy
08
L
C08L 9/00 (2006.01) B01J 19/00 (2006.01) C08F 279/02 (2006.01)
Patent
CA 2022925
Disclosed is an apparatus and process for the continuous production of a rubber-reinforced polymer composition having a bimodal particle size distribution using parallel, substantially plug flow reactors to separately polymerize the same or different solutions of a rubber in a monovinylidene aromatic monomer and optionally at least one other comonomer. After separate partial polymerizations to conversions of from 10 to 50 percent based on the total monomers present, first and second prepolymer compositions are produced containing rubber particles having average particle sizes of from 0.05 to 1.5 micrometer and from 0.7 to 10 micrometer, respectively, with the average rubber particle size of the second prepolymer composition being at least 1.3 times the average rubber particle size of the first prepolymer composition. The first and second prepolymer compositions are continuously removed from their respective reactors and mixed in a proportion such that the rubber particles derived from the first prepolymer will constitute from 50 to 95 percent by weight of the rubber content of final product after further polymerization and recovery of the resulting polymer product from any unreacted starting materials. This invention is advantageously used to prepare HIPS-type products with small particles in the range from 0.2 to 0.7 micrometer and larger particles in the range from 1.5 to 5 micrometer or ABS-type products with small particles in the range from 0.5 to 0.8 micrometer and large particles in the range from 1 to 3 micrometer.
Aerts Ludo M.
Alle Narasaiah
Van Nuffel Claude T. E.
Smart & Biggar
The Dow Chemical Company
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