| 摘要 |
A method of improving the resistance to hydrolysis of a urethane elastomer prepared by reacting a hydroxylated compound comprising a specified first polyester polyol with a prepolymer prepared by reacting a specified second polyester polyol or a polyether polyol with one or more polyisocyanates in the presence of a catalyst and optionally an expansion agent and a surfactant. The prepolymer is prepared with a molar excess of polyisocyanate with respect to the polyester or polyether polyol. The first and second polyester polyols are prepared by reaction of one or more polyacids with one or more polyols. The first polyester polyol is prepared by reaction of an 8-12C aliphatic dicarboxylic acid and ortho-phthalic acid or its anhydride with one or more polyols. Independent claims are also included for: (1) The first polyol; and (2) Urethane elastomer with improved resistance to hydrolysis obtained by the method. |
