Polyurethane resin having satisfactory adhesive property, and adhesive composition using the same
Disclosed herein is a polyurethane resin containing, as copolymerization components, a polycarbonate polyol (A), an organic diisocyanate (B) and a chain extender (C), wherein the polycarbonate polyol (A) contains a specific structure in an amount of 60 mol % or more and a glass transition temperature of the polyurethane resin is 50° C. or higher. The polyurethane resin has excellent heat resistance and satisfactory adhesive property to various substrates, and is usable as an adhesive composition.
1. A polyurethane resin containing, as copolymerization components, a polycarbonate polyol (A), an organic diisocyanate (B) and a chain extender (C),
wherein the polycarbonate polyol (A) contains a structure represented by the following general formula (1) in an amount of 60 mol % or more,
wherein a copolymerization content of the organic diisocyanate (B) is 1 part by mass or more and 50 parts by mass or less, relative to 100 parts by mass of the polycarbonate polyol (A),
wherein the chain extender (C) is a polyol compound, and
wherein a glass transition temperature of the polyurethane resin is 50° C. or higher,
wherein in general formula (1), n represents an integer of 1 to 20.
2. The polyurethane resin according to claim 1 , wherein the organic diisocyanate (B) is isophorone diisocyanate, 4,4′-diphenylmethane diisocyanate or hexamethylene diisocyanate.
3. The polyurethane resin according to claim 1 , wherein the chain extender (C) is a glycol compound having 10 or less carbon atoms.
4. An adhesive composition comprising the polyurethane resin according to claim 1 and a crosslinking agent.
5. A binder for screen inks comprising the polyurethane resin according to claim 1 and a crosslinking agent.
6. A binder for decorative molding comprising the polyurethane resin according to claim 1 and a crosslinking agent.