Patent ID: 9574117
Date: 2017-02-21
CPC Classifications: B32B,C08K,C08L,C09J,Y10T

Claim:
1. An adhesive comprising: a) an acrylic copolymer comprising the reaction product of i) a first alkyl (meth)acrylate, wherein the alkyl group of the first alkyl (meth)acrylate comprises at least 5 carbon atoms; ii) a second alkyl(meth)acrylate, wherein the alkyl group of the second alkyl (meth)acrylate comprises 1 to 4 carbon atoms; and iii) a vinyl carboxylic acid; and b) a high Tg tackifier having a glass transition temperature of at least 20° C.; and c) a low Tg tackifier having a glass transition temperature of no greater than 0° C., wherein the glass transition temperatures of the high Tg tackifier and the low Tg tackifier are greater than the glass transition temperature of the acrylic copolymer, wherein the weight ratio of the first alkyl (meth)acrylate to the second alkyl (meth)acrylate is between 3:1 and 1:3, and the acrylic copolymer comprises at least 3% by weight and no greater than 8% by weight of the vinyl carboxylic acid; and wherein the adhesive comprises 35 to 45% by weight of the high Tg tackifier and 2 to 13% by weight of the low Tg tackifier, based on the total weight of the acrylic copolymer, the high Tg tackifier and the low Tg tackifier.