| 摘要 |
The invention relates to a process for the preparation of hydrolysis-stable, low temperature-flexible, preferably cellular polyurethane elastomers of high wear resistance, by reacting A) organic polyisocyanates, preferably polyester-polyol prepolymers having NCO contents of from 25 to 10% by weight, with B) polyester-diols having hydroxyl numbers of from 30 to 120, prepared by polycondensation of adipic acid with a diol mixture which essentially comprises a) from 20 to 60% by weight of 1,4-butanediol, b) from 20 to 40% by weight of 1,6-hexanediol and c) from 20 to 40% by weight of neopentyl glycol and/or diethylene glycol and C) chain extenders or crosslinking agents, in the presence of D) catalysts, and optionally E) blowing agents, assistants and additives, where, as additives, high-molecular-weight quaternary ammonium salts, in particular, are also used as antistatics. n |
