Abstract: An ABS polymer comprising (A) a graft copolymer formed by graft polymerizing styrene and acrylonitrile monomers onto an initially ungrafted, low gel diene rubber and (B) a copolymer of said grafted monomers in which said graft copolymer is dispersed; said diene rubber comprising 3 to 25% by weight of such polymer with the polymerized acrylonitrile content thereof being 27 to 40% by weight.

Abstract: The invention relates to a process for preparing ABS polymers by continuous mass polymerization wherein an alkenyl aromatic monomer having a diene rubber dissolved therein is charged continuously to a reactor simultaneously with a separate feed-stream of an alkenyl nitrile monomer. The reactor is stirred to maintain, in the reaction mixture contained therein, a substantially uniform composition and operates at a steady state polymer solids level above that at which phase inversion occurs and up to about 70% polymer solids such that the diene rubber added is dispersed as rubber particles having a particle size of about 0.1 to 10 microns. A partially polymerized reaction mixture is continuously removed from the reactor and an ABS polymer is recovered therefrom.

Abstract: The invention relates to a process for dewatering an aqueous latex containing rubber particles grafted with alkenyl aromatic and alkenyl nitrile monomers and emulsified with an anionic surfactant wherein alkenyl aromatic and alkenyl nitrile monomers are dispersed in said latex along with a cationic surfactant in an amount sufficient to deemulsify said grafted rubber particles. The grafted rubber particles are extracted from the aqueous phase into the monomer phase as a liquid oil phase, with the aid of the cationic surfactant, said aqueous phase forming a separate water phase essentially free of said oil phase followed by separating said water phase from said liquid oil phase.

Abstract: This invention relates to an improved process for preparing ABS resins wherein a alkadiene rubber is grafted in aqueous emulsion with styrene and nitrile type monomers, forming a grafted rubber, extracting said grafted rubber into a monomer phase and separating said monomer-grafted rubber phase from said aqueous phase followed by mass polymerizing said grafted rubber-monomer phase to form an ABS polyblend, wherein the improvement comprises, carrying out the mass polymerization of said monomers in the presence of sufficient carbon dioxide to provide an ABS resin having a substantially white color.

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 organic diperoxide compound in said solution and mass polymerizing said solution, said diperoxide initiating a higher molecular weight polymer fraction providing said polymer with a broader molecular weight distribution.

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: The elongation at fail and toughness of rubber reinforced polystyrene and ABS type polymeric polyblends are improved without loss of tensile strength by the addition of a liquid polymer of a conjugated diene monomer having a molecular weight of from about 1,000 to 10,000. The liquid polymers may be incorporated during any stage of the process for preparing the polymeric polyblend.

Abstract: This invention relates to an improved polymeric polyblend characterized by a blend of (A) a polymer of at least one monoalkenyl aromatic monomer having dispersed therein an amount sufficient to toughen said polyblend of a (B) diene rubber, said rubber being dispersed as crosslinked grafted rubber particles wherein said improvement comprises (C) said diene rubber being a particular polybutadiene rubber having a broad molecular weight range providing the polyblend with greatly improved impact strength.

Abstract: This invention relates to an improved polymeric polyblend characterized by a blend of (A) a polymer of at least one monoalkenyl aromatic monomer having dispersed therein an amount sufficient to toughen said polyblend of a (B) diene rubber, said rubber being dispersed as crosslinked grafted rubber particles wherein said improvement comprises (C) said diene rubber particles having a rubber moiety structured in a novel morphological form comprising rubber fibers or rubber sheets and mixtures thereof.

Abstract: The invention relates to polystyrene polyblends reinforced with grafted rubbers having improved melt flow without loss of tensile strength or toughness by incorporating 1 to 5 weight percent of a polyethylene wax having a molecular weight of from about 500 to 2400 and a dispersion index of from about 1-5.

Abstract: This invention relates to a polyblend composition and a method for preparing same, said composition comprising a copolymer of a monovinylidene aromatic monomer such as styrene and an unsaturated nitrile monomer such as acrylonitrile blended with a grafted chloroprene rubber, a grafted polybutadiene rubber and a metal oxide.