| 摘要 |
<p>The invention relates to polyester polyols having an average equivalent weight ranging from 200 to 4000, which are produced by reacting agr;,ohgr; dicarboxylic acids with 1, 4 butanediol, 1,6 hexanediol, 1,3 propanediol or 1,5 pentanediol as well as with polyols having 3 to 6 hydroxyl groups. The inventive polyester polyols are used to produce PUR cast elastomers that have an improved resistance to hydrolysis.</p> |
