| 摘要 |
Rigid foams based on isocyanate are produced by reacting a) organic and/or modified organic polyisocyanates with b) at least one relatively high molecular weight compound containing at least two reactive hydrogen atoms and, if desired, c) low molecular weight chain extenders and/or crosslinkers in the presence of d) carbon dioxide as sole or additional blowing agent, e) foam stabilizers, f) catalysts and, if desired, g) further auxiliaries and/or additives, wherein at least one organosilicon compound having a relative ethylene oxide/propylene oxide weight ratio of over 70/30 is used as foam stabilizer, with the total Si content being greater than or equal to 5% by weight, based on the weight of the foam stabilizer or stabilizers used. The isocyanate-based rigid foams produced in this way can be used as insulation material.
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