COMPOSITIONS OF POLYAMIDE AND IONOMER

摘要

Disclosed is a shaped article and a method for preparing such an article, the article comprising a composition comprising (1) a polyamide having a melt viscosity from 200 Pas to 4000 Pas, measured at 250 °C and a shear rate of 12 sec"1 in an amount in the range of 35 to 70 weight % of the combination of (1) and (2); and (2) an ionomer composition in an amount in the range of 30 to 65 weight % of the combination of (1) and (2), wherein the ionomer composition comprises at least one neutralized acid copolymer, wherein the acid copolymer comprises copolymerized units of ethylene with (a) copolymerized units of an alpha-beta unsaturated monocarboxylic acid wherein the monocarboxylic acid is methacrylic acid or acrylic acid or a combination thereof; (b) optionally copolymerized units of an alpha-beta unsaturated dicarboxylic acid derivative selected from maleic anhydride and alkyl monoesters of maleic acid or fumaric acid, in the amount of 0 to 7 weight % of the copolymer; wherein the combination of (a) and (b) when present is from 7 to 21 weight % of the copolymer; (c) optionally copolymerized units of an alkyl acrylate or alkyl methacrylate comonomer, in the amount of 0 to 25 weight % of the copolymer; and wherein 50 mole % to 95 mole % of the total carboxylic acid groups in the copolymer are neutralized to salts comprising cations of zinc (Zn) and a second metal (M2) selected from Group 1 of the Periodic Table of the Elements, wherein Zn cations comprise 10 to 90 % mole equivalents and M2 cations comprise 90 to 10 % mole equivalents. The articles prepared from the compositions with mixed ion ionomers exhibit high stiffness, hardness and toughness, good scratch resistance, desirable low melt viscosity and high processability.