Continuous mass polymerization process for polyblends

C - Chemistry – Metallurgy – 08 – F

Patent

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400/1129, 400/11

C08F 279/00 (2006.01) C08F 279/02 (2006.01) C08L 7/00 (2006.01) C08L 51/04 (2006.01)

Patent

CA 1039437

ABSTRACT OF THE DISCLOSURE This invention relates to a process for the contin- uous mass polymerization of polyalkenyl aromatic polymers having a grafted diene rubber phase dispersed therein. Said process includes continuously and progressively mass polymer- izing a monomer composition comprising at least one monoalkenyl aromatic monomer having about 2 to 15% of a diene rubber dis- solved therein through an initial reaction zone wherein about 10 to 50% conversion of monomer to polymer is realized along with a dispersion of said rubber particles followed by progressive polymerization of the mixture through a staged, isobaric stirred reaction zone under substantially linear flow, withdrawing the mixture from a final stage at a rate approximating the rate at which all additions are made to all stages of the reaction zone, heating the mixture until the grafted rubber-monomer particles are cross-linked to a determined swelling index, and separating the polymeric solids from the volatile phase of the mixture wherein the polymeric solids comprise a poly blend of combined polymers having dispersed therein cross-linked rubber particles having occluded and grafted first and second polymers.

209633

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