THERMOSETTING COMPOSITION

摘要

A thermosetting composition which comes to have, in particular, moderate elongation and excellent strength and hardness, and is usable in automotive body sealers and undercoats. The composition comprises: an acrylic sol comprising acrylic resin particles, a plasticizer, and a filler; one or more blocked isocyanate-terminated urethane prepolymers obtained by reacting one or more polyols with an excess polyisocyanate compound; and a hardener therefor. It is characterized in that at least part of the polyols for use in forming the isocyanate-terminated urethane prepolymers is accounted for by a polymer polyol or that at least part of the blocked isocyanate-terminated urethane prepolymers is accounted for by a blocked isocyanate-terminated urethane prepolymer obtained by reacting a polymer polyol with an excess polyisocyanate compound.