| 摘要 |
Cold-hardening (curing) flexible polyurethane moulded foams having excellent damping characteristics are produced by reacting polyisocyanates with a) at least one polyether containing at least two OH groups and having an OH number of from 20 to 60, based on from 75 to 95% by weight of propylene oxide and from 5 to 25% by weight of ethylene oxide, and b) a polyether or polyester containing at least two OH groups and having an OH number of from 150 to 400, and c) a polyether containing at least two OH groups and having an OH number of from 20 to 200, based on propylene oxide and ethylene oxide, with an ethylene oxide content of greater than 50% by weight, based on propylene oxide and ethylene oxide, in the presence of water and optionally organic blowing agents, catalysts and foam stabilisers and optionally further assistants and additives. |
