Polyurethane hot melt adhesives with acrylic copolymers and thermoplastic resins

Abstract

This invention relates to solvent-free moisture curable one-part hot melt polyurethane adhesive or sealant compositions which are solid at room temperature. In one embodiment, the polyurethane adhesive or sealant composition comprises in percentages by weight (a) from about 20 % to about 75 % of a urethane prepolymer; (b) from about 1 % to about 66 % of a reactive, hydroxyl containing, or a nonreactive polymer formed from ethylenically unsaturated monomers; and (c) from about 20 % to about 75 % of a thermoplastic resin. In another embodiment, the polyurethane adhesive or sealant composition comprises, in percentages by weight of the polyurethane composition (a) from about 10 % to about 90 % of a urethane prepolymer; and (b) from about 5 % to about 90 % of a thermoplastic resin which is an ethylene vinylacetate / ethylene acrylate terpolymer.

Description

field of invention

[0001] The present invention relates to solvent-free moisture-curable one-component hot melt polyurethane adhesives or sealing compositions that are solid at room temperature. In one embodiment, the polyurethane adhesive or sealant composition comprises, by weight percent, (a) about 20% to 75% polyurethane prepolymer; (b) about 1% to 66% ethylenically unsaturated and (c) from about 20% to about 75% of a thermoplastic resin. In another embodiment, the polyurethane adhesive or sealing composition comprises, by weight percentage of the polyurethane composition, (a) about 10%-90% of polyurethane prepolymer; and (b) about 5%-90% of A thermoplastic resin which is an ethylene-vinyl acetate / ethylene-acrylate terpolymer. technical background

[0002] Hot melt adhesives are 100% solid substances that do not contain or require any solvents and are solid at room temperature. By heating, the hot melt adhesive melts into a liquid or fluid sta...