| 摘要 |
<p>This invention relates to molded polyurethane foams prepared by reacting a specific polyisocyanate with a specific polyol in the presence of water as a blowing agent and a catalyst, wherein (a) the polyisocyanate comprises a mixture of (i) a specified amount of polymethylene polyphenyl polyisocyanate and (ii) an NCO-terminated prepolymer prepared from the reaction of an organic polyisocyanate with a specified amount of poly(oxytetramethylene)glycol, or a specific NCO-terminated prepolymer prepared from the reaction of (i) an organic polyisocyanate, (ii) a specified amount of polymethylene polyphenyl polyisocyanate and (iii) a specified amount of poly(oxytetramethylene)glycol, (b) the polyol contains a specified amont of polymer polyol prepared from the reaction of a polyetherpolyol with an ethylenic unsaturated monomer, and (c) the catalyst contains an organotin compound. The molded polyurethane foams can be prepared under good demoldability and have excellent abrasion resistance, and therefore, can be useful for automotive steering wheels, headrests, armrests and the like.</p> |
