| 摘要 |
Polyurethane polymers comprising the reaction product of an organic polyisocyanate (A), an organic polyol (B), & a difunctional extender (C) wherein the improvement comprises employing as the polyisocyanate (A) a composition comprising a bond of, (a) a prepolymer comprising the reaction product of methylenebis (phenyl isocyanate) with a polyol mixture comprising: (1) polyol having a molecular weight of at least 1,000, & (2) polyol having a molecular weight of about 115 to 300 & (b) a liquefied methylenebis (phenyl isocyanate). Also disclosed are blends of (a) & (b).
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