Patent ID: 7960017

Claim:
A polymeric sheet having a thickness of about 10 mils to about 120 mils and having at least one layer consisting essentially of an ionomer or ionomer blend, wherein said ionomer is a copolymer of ethylene and about 10 to about 30 weight percent alpha, beta-ethylenically unsaturated carboxylic acid selected from the group consisting of acrylic acid, methacrylic acid and mixtures thereof, wherein said ionomeric blend is a blend of copolymers of ethylene and about 10 to about 30 weight percent alpha, beta-ethylenically unsaturated carboxylic acid selected from the group consisting of acrylic acid, methacrylic acid and mixtures thereof, wherein said ionomer or ionomer blend is neutralized with sodium in an amount ranging from about 15 to about 50% and zinc in an amount ranging from about 50 to about 85%, wherein the percentages are based on the total amount of neutralization of the alpha, beta-ethylenically unsaturated carboxylic acid, and wherein the total amount of neutralization of the alpha, beta-ethylenically unsaturated carboxylic acid is about 43 to about 50%.