POLYURETHANE COMPOSITION FOR POWDER COATING

摘要

A polyurethane based composition for powder coating uses, which comprises a combination of an organic polyisocyanate compound and a hydroxylcontaining compound, the hydroxyl-containing compound being (A) A hydroxyl-containing polymer, or its carboxyl-modified product, obtained by hydrolyzing a copolymer of a vinyl ester of a saturated monocarboxylic acid and other polymerizable vinyl monomers, and ( B) A polyester polyol of softening point of not lower than 40.degree.C containing not less than 30 weight % of cyclohexylene or cyclohexenylene group or spiro rings. The composition provides coating films exhibiting exceedingly improved hardness, heat resistance, toughness and transparency as compared with the conventional polyolefin based powder coatings.