| 摘要 |
The instant invention is directed to a process for the preparation of modified polyether polyols comprising polymerizing of from 1 to 50 parts by weight of a mixture of 20 to 100% by weight (based on the total quantity of monomers) of acrylonitrile and 0 to 80% by weight of styrene in 50 to 99 parts by weight of the polyether polyol in the presence of a polymerization initiator which yields radicals, wherein said polymerization is carried out in the presence of from 0.1 to 1.5% by weight, based on the total quantity of monomers put into the process, of a compound of the formula: A=CH-X-R wherein A represents a divalent group <IMAGE> R represents a C1-18 alkyl, C1-10 cycloalkyl, or substituted or unsubstituted benzyl group, R' represents C1-8 alkyl group, n represents 0, 1 or 2 and X represents oxygen or sulfur.
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