Patent ID: 9181460
Filing Date: 2015-11-10
Classification: B32B,B65D,C08G,C09J,Y10T

Abstract:
1. A two-part solvent-free laminating adhesive for a laminate, comprising Part (A), a mixture of i) from about 20% by weight to about 80% by weight of a first polyol selected from the group consisting of polyether polyols, polyester polyols, polyester/polyether polyols, natural oil polyols, and combinations thereof, and ii) from about 20% by weight to about 80% by weight of a hydroxyl functional acrylic polymer having a weight average molecular weight of no greater than 15,000 g/mole, a glass transition temperature (Tg) of no greater than 20° C., and a hydroxyl number of from about 10 to about 110, the first polyol and the hydroxyl functional acrylic polymer being co-dissolved so as to form a homogeneous liquid solution, and Part (B), an isocyanate-terminated polyurethane prepolymner having a percentage isocyanate (NCO%) of from about 4% to about 20% based on the weight of the prepolymer, the Part (B) being present relative to the Part (A) at an NCO/OH ratio of at least about 1.1, wherein the laminate exhibits an oxygen transmission rate (OTR) percent decrease of no greater than 7% according to the OTR Percent Decrease Determination Method.