URETHANE-BASED ADHESIVE, POLYOL COMPOSITION FOR URETHANE-BASED ADHESIVE, POLYISOCYANATE COMPOSITION FOR URETHANE-BASED ADHESIVE, HARDENED MATERIAL OF URETHANE-BASED ADHESIVE, AND LAMINATION FILM

摘要

Provided is a urethane-based adhesive which contains, as essential components; a polyol (A) selected from the group consisting of polyester polyols, polyester polyether polyols, polyester polyurethane polyols, polyether polyurethane polyols, and polyester polyether polyurethane polyols; a polyisocyanate (B); and a carboxyl group-containing compound (C) having an SP value of 20-32 (J/cm³)^1/2 and an acid value of 250-1,000 mgKOH/g, wherein the carboxyl group-containing compound (C) is included in an amount of 0.01-1.5 parts by mass with respect to 100 parts by mass of the polyol (A).