| 摘要 |
A multiphase polymer composition having increased impact resistance at low temperatures, includes a blend of an ionomer dispersed in nylon 6, a polyami de other than nylon 6, and a composition that includes EP or EPDM grafted with 0.05 to 3 weight percent of a carboxylic acid or any anhydride thereof. The ionomer is formed from a partially neutralized acid copolymer precursor, the acid copolymer precursor having polymerized in-chain units derived from the monomers comprising: (a) ethylene, (b) 2 to 25 weight percent of (meth)acryl ic acid, (c) 0.1 to 15 weight percent of a dicarboxylic acid monomer, (d) 0 - 4 0 weight percent of a C1-C8-alkyl alkyl acrylate, the ionomer being formed by neutralization of from about 5 to 90 percent of the total number of carboxyl ic acid units in the copolymer with metal ions. The (meth)acrylic acid and dicarboxylic acid monomer is from 4 to 26 weight percent of the acid copolym er precursor, and the total comonomer content preferably does not exceed 50 weight percent of the acid copolymer precursor. Preferably, the ionomer has a melt index of from 0.01 to 100 grams/10 minutes, and the ratio of the number of moles of metal ions in the ionomer to the number of moles of the carboxyl ic acid or any anhydride thereof in the grafted EP or EPDM is greater than 1.0.
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