Abstract: Polycarbonates are blended with an impact modifier to improve the impact resistance thereof. The impact modifier is a multiple phase polymer system prepared by subsequent multiple stage polymerizations. The first phase which constitutes from about 50 percent to about 90 percent by weight of the multiple phase impact modifier is generally an elastomer such as an alkyl acrylate wherein the alkyl portion has from 2 to 18 carbon atoms. The second phase polymer is generally a plastic type compound such as a vinyl substituted aromatic, an alkyl methacrylate, or an alkenyl nitrile compound. The impact modifiers are made without utilizing any crosslinking or grafting agents and thus are substantially free of any such bonds and are generally free-flowing powders.

Abstract: Handling problems of cadmium curing agents are minimized by adding to a nitrile rubber latex an antioxidant in the form of a soluble alkali metal salt to form a modified latex and then coagulating the modified latex with a cadmium salt to form nitrile rubber containing bound antioxidant in the form of a cadmium compound. Alternately, a concentrate containing a large proportion of the antioxidant in the form of a cadmium compound is prepared which can be subsequently added to a nitrile latex to provide the cadmate cure function.

Abstract: Antioxidant compositions as described which are the reaction products of a mixture of(a) at least one compound selected from compounds having the formula ##STR1## wherein each Ar is an aromatic group, and R and R.sup.1 are each independently hydrogen, alkyl, substituted alkyl, oxyalkylene or --C(O)--R.sup.2 --COOH groups wherein R.sup.2 is an alkylene or alkenylene group, with the proviso that at least one of the R and R.sup.1 groups must be hydrogen or a group containing at least one substituent reactive with an epoxy group, andAr--NH--Ar--O--R.sup.3 (FORMULA II)wherein Ar is as defined above and R.sup.3 is hydrogen, or a substituted alkyl group containing at least one substituent reactive with an epoxy group, or --C(O)--R.sup.2 --COOH wherein R.sup.2 is an alkylene or alkenylene group, and(b) at least one polyepoxide having at least 2 epoxy groups per molecule.

Abstract: Carboxyl-containing polymers are cured using a cure system consisting essentially of (1) a di- or polyhalide, (2) a nitrogen-containing compound selected from the group consisting of secondary or tertiary amines, guanidines, and quaternary ammonium salts, and (3) an acid acceptor.

Abstract: Acrylate rubbers having both halogen and carboxyl cure sites are vulcanized using an alkali metal salt of a carboxylic or organo-phosphoric acid and an amine-blocked isocyanate. The vulcanized compositions exhibit low press-cured and post-cured compression set.

Abstract: Polymer blends of a halogen-containing polymer and a carboxyl-containing polymer are covulcanized using as the cure system (1) a metal oxy compound and (2) a quaternary ammonium salt or a monofunctional tertiary amine. The vulcanizates exhibit excellent physical properties, and are useful in fabricating hose, belting, gaskets, o-rings, and the like.