| 摘要 |
PURPOSE:To obtain the subject composition, composed of a specific organic polyisocyanate, a polyol 1, a chain extender, a foaming agent and a catalyst, having a high-density skin layer, excellent in quick curability, weather, discoloring and heat resistances and useful as automotive members, etc. CONSTITUTION:The objective composition is composed of (A) an organic polyisocyanate containing 10-90wt.% hexamethylene diisocyanate polymer containing >=10wt.% hexamethylene diisocyanate trimer forming the isocyanurate ring and 90-10wt.% NCO group-terminated prepolymer, (B) a polyol 1 such as polyether polyol (C) a chain extender such as ethylene glycol, (D) a foaming agent such as water and (E) a catalyst such as a tertiary amine. |
