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    • 64. 发明授权
    • Low viscosity polymer polyols with improved dispersion stability
    • 具有改进的分散稳定性的低粘度聚合物多元醇
    • US5364906A
    • 1994-11-15
    • US109777
    • 1993-08-20
    • Frank E. CritchfieldDonald W. SimrothStuart L. Watson
    • Frank E. CritchfieldDonald W. SimrothStuart L. Watson
    • C08F283/00C08F291/08C08F283/02
    • C08F283/00C08F291/08
    • The present invention provides polymer polyols and a method for preparing polymer polyols which have (1) exceptional dispersion stability, especially at high styrene contents, and (2) substantially smaller particle sizes than polymer polyols having equivalent viscosity. In a preferred embodiment of the present invention, a first reaction product is obtained by feeding the following materials to a first continuous reactor in the presence of a free radical initiator or catalyst: (a) less than about 50 wt % of a total monomer proportion or monomer mixture, preferably comprising styrene/acrylonitrile at a ratio preferably greater than about 50/50 wt %; (b) at least about 50 wt % of a total base polyol proportion; (c) a majority of a precursor stabilizer; and, (d) a polymer control agent (PCA). The product from this first reaction then is again fed through a continuous reactor, which may be the same as the first reactor, along with additional initiator, at least about 50% of the total monomer proportion, and, optionally, any balance of the total base polyol proportion, precursor stabilizer, and PCA. The product from this second reactor is a high stability, low viscosity polymer polyol.
    • 本发明提供聚合物多元醇和制备聚合物多元醇的方法,其具有(1)特殊的分散稳定性,特别是在高苯乙烯含量下,和(2)与具有等同粘度的聚合物多元醇相比,颗粒尺寸基本上更小。 在本发明的一个优选实施方案中,通过在自由基引发剂或催化剂存在下,将下列材料加入到第一连续反应器中获得第一反应产物:(a)小于约50重量%的总单体比例 或单体混合物,优选包含苯乙烯/丙烯腈,其比例优选大于约50/50重量%; (b)至少约50重量%的总碱多元醇比例; (c)大部分前体稳定剂; 和(d)聚合物控制剂(PCA)。 然后将来自该第一反应的产物再次通过连续反应器,其可以与第一反应器相同,以及额外的引发剂,至少约50%的总单体比例,以及任选地,总计的任何余量 碱性多元醇比例,前体稳定剂和PCA。 来自该第二反应器的产物是高稳定性,低粘度的聚合物多元醇。