Abstract: A continuous process for the manufacture of impact resistant polymers is disclosed. The process comprise polymerization of a reaction mixture containing vinylaromatic monomers in the presence of soluble rubber and entails shearing at least some of said mixture at a rate of more than 30000 1/s using a device having no rotating parts. The resulting product is characterized in its low gloss and improved impact properties.

Abstract: Thermoplastic polyblends having weatherability and impact strength are formed by blending a first graft copolymer containing a conjugated diene rubber substrate having a weight average particle size between about 0.6 and about 10 microns with a second graft copolymer containing an EPDM-type rubber substrate having a weight average particle size between about 0.05 and about 1 micron or an alkyl acylate rubber substrate having a weight average particle size between about 0.05 and about 0.5 micron. The superstrate of the two graft copolymers comprises a monovinylidene aromatic hydrocarbon and an unsaturated nitrile.

Abstract: The present invention relates to an improved process for the continuous mass polymerization of solutions comprising an alkenyl aromatic monomer having a diene rubber polymer dissolved therein comprising the steps of polymerizing said solution in a first reaction zone to about 15 to 50% conversion dispersing said diene rubber or rubber particles in a partially polymerized solution, followed by further polymerization said partially polymerized solution in a second polymerization zone to about 20 to 95% conversion the improvement comprising having present in said solution, as fed to said first reaction zone, a polymer of said monomers in an amount sufficient to control the size of said diene rubber particles.

Abstract: The present invention relates to an improved process for the continuous mass polymerization of solutions comprising alkenyl aromatic monomers having about 1 to 10% by weight of a polybutadiene rubber dissolved therein, the steps comprising, (A) continuously charging said solution to a first reaction zone operating at about 10 to 40% conversion forming a first partially polymerized mixture, (B) continuously charging said first mixture to a second reaction zone operating at about 50-90% conversion forming a second partially polymerized mixture, and finally, (C) separating the residual monomer from said second mixture providing a polyblend of a matrix phase of said monomers having polybutadiene rubber particles grafted with said monomers dispersed therein, the improvement comprising: charging a monomer-polybutadiene solution in step (A) having in addition about 1 to 10% by weight of a diene block copolymer and about 1 to 20% by weight of a polymer of said monomers dissolved in said solution followed by carrying

Abstract: The invention relates to a continuous mass polymerization process for polyblends having a dispersed rubber phase with a bimodal rubber particle size distribution, wherein, first and second monomer-rubber solutions are fed to a first back-mixed polymerization zone such that said first solution forms particles of about 0.5 to 1.5 microns and said second solution, having present a dissolved rubber and a dissolved polymer of said monomer, forms particles of about 2 to 5 microns during partial polymerization of 10 to 50% of said monomers. Said partially polymerized solutions are further polymerized in a second zone, with linear flow, to a conversion of 20 to 95%, forming said polyblend with a bimodal rubber particle size distribution having improved toughness and gloss.