Abstract: Weatherable thermoplastic polymeric compositions are formed by blending weatherable grafted rubber composition with an aliphatic diester selected from the group consisting of dialkoxyalkoxyalkyl diesters and dialkoxydialkoxyalkyl diesters of aliphatic dicarboxylic acids containing 4 to 8 carbon atoms.

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 invention relates to an emulsion polymerization process for preparing polymeric polyblends having rubber phases with high levels of grafted monomers providing polyblends with superior extruded glass and toughness. Diene rubber particles in latices are grafted with a monomer formulation of alkenyl aromatic and alkenyl nitrile monomers having present about 1 to 30% by weight of a myrcene triunsaturated aliphatic C.sub.10 H.sub.16 hydrocarbon. The myrcene unexpectedly increases the graft efficiency of the alkenyl aromatic and alkenyl nitrile monomers substantially as a superstrate on the rubber substrate particles such that a polyblend of a matrix phase polymer of said monomers having said grafted rubber dispersed therein has superior toughness and gloss.

Abstract: The invention relates to an improved process for the mass polymerization of solutions comprising monoalkenyl aromatic monomers and optionally monoalkenyl nitrile monomers having a diene rubber dissolved therein wherein the improvement comprises dissolving a minor amount of an aliphatic mono-olefinic compound in said solution and mass polymerizing said solution, said olefinic compound forming free radicals with said monoalkenyl aromatic monomer that are more active than said monoalkenyl aromatic free radicals in grafting said rubber provided a higher grafted rubber phase.

Abstract: Disclosed herein is a latex polymerization process for grafting styrene and acrylonitrile type monomers onto a rubber latex which has been stabilized with a substance which inhibits polymerization. The process involves carrying out the graft polymerization reaction in the presence of from 1 to 10 parts of latex seed particles per hundred parts of rubber using a chain transfer agent that doesn't inhibit the graft polymerization reaction.

Abstract: An improved process for preparing ABS polyblends, the steps comprising, polymerizing a polymerizable mixture of a monomer formulation and a diene rubber forming a grafted copolymer and a matrix interpolymer, the improvement comprising, polymerizing said monomer formulation to at least about 90% conversion, charging a third monomer and further polymerizing said monomer formulation in the presence of said third monomer to convert essentially all of said monomer formulation to interpolymer followed by recovering said polyblend having a low residual monomer content.