Polyurethane foam molding
AssigneesThe Dow Chemical Company, Dow Mitsubishi Kasei Limited
InventorsYoshiaki Miyazaki, Kazuo Mizumura
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Abstract
This invention relates to polyurethane foam moldings prepared by reacting a specific polyisocyanate with a polyol in the presence of water as the primary blowing agent, wherein the polyisocyanate comprises a specific polyisocyanate mixture of a NCO-terminated prepolymer prepared employing poly(oxytetramethylene)glycol ("PTMG") with polymethylene polyphenyl polyisocyanate ("Polymeric MDI"), or a specific NCO-terminated prepolymer prepared from the reaction of an organic polyisocyanate containing Polymeric MDI as an essential component with PTMG. The polyurethane foam moldings have excellent abrasion resistance and can be useful for automotive steering wheels, headrests, armrests and the like.
Claims10
Polyurethane foam moldings prepared by reacting a polyisocyanate with a polyol in the presence of water as a blowing agent, wherein (a) the polyisocyanate comprises a mixture of (i) from 5-30 weight percent polymethylene polyphenyl polyisocyanate and (ii) an NCO-terminated prepolymer having an NCO content of from 14-28 weight percent prepared from the reaction of an organic polyisocyanate with 20 to 45 weight percent of a poly(oxytetramethylene)glycol which is a linear polyetherpolyol having a primary hydroxy group in both its terminals and a weight average molecular weight of from 300-3000, said weight percents being based on the total weight of organic polyisocyanate, poly(oxytetramethylene)glycol, and polymethylene polyphenyl polyisocyanate, and (b) the polyol contains at least 30 weight percent polymer polyol prepared from the reaction of a polyetherpolyot with an ethylenically unsaturated monomer.
Polyurethane foam moldings prepared by reacting a polyisocyanate with a polyol in the presence of water as a blowing agent, wherein (a) the polyisocyanate comprises an NCO-terminated prepolymer having an NCO content of from 14-28 weight percent prepared from the reaction of (i) an organic polyisocyanate, (ii) from 5-30 weight percent polymethylene polyphenyl polyisocyanate and (iii) from 20 to 45 weight percent of a poly(oxytetramethylene)glycol which is a linear polyetherpolyol having a primary hydroxy group in both its terminals and a weight average molecular weight of from 300-3000, said weight percents being based on the total weight of organic polyisocyanate, poly(oxytetramethylene)glycol, and polymethylene polyphenyl polyisocyanate, and (b) the polyol contains at least 30 weight percent polymer polyol prepared from the reaction of a polyetherpolyol with an ethylenically unsaturated monomer.
Dependencies are inferred from the claim text.