US 6,555,645 B1 · Degradable polyurethane resin

Abstract

The invention is a degradable polyurethane resin obtained by reacting 2,5-/2,6-diisocyanatomethylbicyclo[2.2.1]heptane and/or a modified compound thereof with polyol comprising a single compound, mixture or copolycondensate selected from the group consisting of (A) polyhydroxycarboxylate polyol, (B) aliphatic polyester polyol and (C) saccharides, or (D) straight or branched polyol formed by condensation of (A) and/or (B) with aliphatic polyhydric alcohol having functionality of three or more, and the polyurethane resin has hydralyzability and biodegradability, is excellent in rigidity and elasticity in combination with flexibility as compared with conventionally known biodegradable resin, and can provide formed articles having outstandingly high elasticity and elongation and other unprecedented properties.

Claims15

Dependent claims

A degradable polyurethane resin resulting from reaction of polyol with 2,5/2,6-diisocyanatomethylbicyclo[2.2.1]heptane represented by the formula (1):

wherein the two isocyanatomethyl groups are located on 2,5-positions or 2,6-positions or a mixture thereof, and/or a modified compound thereof, wherein the polyol is (A) polyhydroxycarboxylate polyol wherein the polyhydroxycarboxylate polyol is obtained by modification of the terminal carboxyl group to a hydroxyl group in the aliphatic polyhydroxycarboxylic acid represented by the formula (2):
wherein R1 is an alkylene group having 1 to 4 carbon atoms in the straight chain portion and having 1 to 6 total carbon atoms which include branched alkyl groups, and m is an integer of 1 or more, or a mixture or copolycondensate of (A) and one or more compounds selected from (B) aliphatic polyesterpolyol and (C) saccharides.

Dependencies are inferred from the claim text.

Degradable polyurethane resin

Life of this patent

Degradable polyurethane resin

Life of this patent

Abstract

Claims15