Process for preparing abs polyblends

Details Process for preparing abs polyblends Process for preparing abs polyblends

C - Chemistry, Metallurgy

08

L

400/3048

C08L 55/02 (2006.01) C08F 285/00 (2006.01)

Patent

CA 1135440

08-12-0413 A PROCESS FOR PREPARING ABS POLYBLENDS ABSTRACT OF THE DISCLOSURE The present invention relates to a process for preparing ABS polyblends having an alkenyl aromatic- alkenyl nitrile monomer matrix polymeric phase rein- forced with rubber particles grafted with said monomers and having a bimodal rubber particle size distribution, the process comprising: charging continuously a formu- lation of said monomers having a soluble diene dis- solved therein and a first grafted diene rubber par- ticle dispersed therein to a back-mixed reaction zone operating at 50-80% steady state, flow-through, con- version of said monomer formulation, continuously mass polymerizing said charged monomer formulation to 50- 80% conversion, forming and dispersing said soluble rubber as second grafted diene particles having a particle size larger than said first grafted rubber particles, continuously withdrawing an effluent from said reaction zone and separating said ABS polyblend from said effluent.

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