| 摘要 |
PURPOSE:To obtain a rubber composition having oil resistance, solvent resistance and abrasion resistance, by curing an NCO-terminated prepolymer obtained by reacting a specified polyol mixture with 4,4'-diphenylmethane diisocyanate. CONSTITUTION:A rubber composition obtained by curing an NCO-terminated prepolymer obtained by reacting a polyol mixture formed by blending a succinic acid polyester polyol (I) with a lactone polyester polyol (II) at a weight ratio of 80/20-20/80 with 4,4'-diphenylmethane diisocyanate. When polyol (I) is used in a weight ratio larger than the above, the general properties of the produced molding are poor and the molding is apparently brittle. When polyol (II) is used in a ratio higher than the above, the solvent resistance of the produced molding is poor, and the molding is merely one having extremely short life as a sqeezee rubber.
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