| 主权项 |
1. An ionomer composition comprising a parent acid copolymer that consists of copolymerized units of ethylene and 18 to 30 weight % of copolymerized units of acrylic acid or methacrylic acid, based on the total weight of the parent acid copolymer, the parent acid copolymer having a melt flow rate (MFR) from 200 to 1000 g/10 min., wherein 50% to 70% of the carboxylic acid groups of the copolymer, based on the total carboxylic acid content of the parent acid copolymer as calculated for the non-neutralized parent acid copolymer, are neutralized to carboxylic acid salts consisting of 90 to 99%, based on the total of neutralized carboxylic acid salts, monovalent alkali metal cations selected from the group consisting of sodium cations, potassium cations, lithium cations or mixtures thereof and 10 to 1%, based on the total of neutralized carboxylic acid salts, of zinc cations and wherein the ionomer composition has a MFR from 1 to 20 g/10 min., each MFR measured according to ASTM D1238 at 190° C. with a 2160 g load. |
