| 摘要 |
<p>The invention relates to long-term hydrolysis-constant polyurethanes which contain ester groups and can be obtained by reacting ring opening products of epoxidized fatty acid esters obtained from fatty acids and/or mixtures of fatty acids with 16 to 20 C-atoms and monofunctional alcohols with 1 to 8 C-atoms with at least trifunctional alcohols with corresponding polyisocyanates. The proportion of bi-unsaturated or poly-unsaturated fatty acids is in total at least approximately 40 % by weight and the proportion of mono-unsaturated fatty acids is on average less than 35 % by weight.</p> |
