Composition comprising melt blended product of thermoplastic resin and two ethylene copolymers containing coreactive groups

A partially grafted, multi-phase, flexible thermomplastic composition formed by melt blending:

• (a) 25-50 volume percent of at least one thermoplastic resin selected from polyethylene, polypropylene and copolymers thereof, poly(butene-1), poly-4-methylpent-1-ene, polystyrene and copolymers thereof, polyphenylene oxide, polyphenylene sulfide and polysulfone, said thermoplastic comprising at least one continuous phase of the composition,
• (b) 10-74 volume percent of at least one ethylene copolymer, E/X/Y, where E is ethylene is at least 50 weight percent of E/X/Y, X is 1-35 weight percent of an acid-containing unsaturated mono-carboxylic acid, and Y is 0-49 weight percent of a moiety derived from at least one alkyl acrylate, alkyl methacrylate, alkyl vinyl ether, carbon monoxide, sulfur dioxide, or mixtures thereof where the alkyl groups contain 1-12 carbon atoms, and further wherein the acid groups in the acid-containing moiety are neutralized from 0-100% by a metal ion, and
• (c) 1-50 volume percent of at least one polymeric grafting agent which contains reactive groups selected from at least one of epoxides, isocyanates, aziridine, silanes, alkyl halides, alpha-halo ketones, alpha-halo aldehydes, or oxazoline, which grafting agents react with the acid-containing moieties in component (b) and wherein the quantity of reactive groups provided to the composition by the grafting agent expressed as MMOLS of reactive groups per one hundred grams of component (b) plus component (c) is between 1 and 35;
• and further wherein the weight percent of monomers containing the reactive groups is 0.5-15 weight percent of the polymeric grafting agent, component c, the remainder of the polymeric grafting agent contains at least 50 weight percent of ethylene and 0-49 weight percent of a moiety derived from at least one alkyl acrylate, alkyl methacrylate, alkyl vinyl ether, carbon monoxide, sulfur dioxide or mixtures thereof where the alkyl groups contain 1-12 carbon atoms, the above volume percentages for components (a), (b) and (c) being based on the total of component (a), component (b), and component (c) only and being calculated from the densities of the individual components prior to mixing.