| 摘要 |
Hard (rigid) polyurethanes are obtainable by reacting 1. polyisocyanates with 2. a polyol mixture comprising a) - OH-functional polyesters having a molecular weight of 260 - 2000 based on C9-C22-fatty acids, b) - OH-functional, oligomeric polyolefins having a molecular weight of 700 - 6000, and optionally c) - at least difunctional polyols having a molecular weight of 62 - 8000, preferably 62 - 400, which are different from components 2a) and 2b), optionally in the presence of 3. water as blowing agent and 4. auxiliaries and additives which are known per se in PUR chemistry. |
