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PREPARATION OF POLYOLES USING DOUBLE METAL CYANIDE CATALYSTS WITH THE CONTINUOUS ADDITION OF INITIATOR
PREPARATION OF POLYOLES USING DOUBLE METAL CYANIDE CATALYSTS WITH THE CONTINUOUS ADDITION OF INITIATOR
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机译:连续添加引发剂的双金属氰化物催化剂制备多聚体
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摘要
Double metal cyanide-catalyzed polyols are made by an improved process in which a starter is continuously added during polymerization of the epoxide. The process includes a continuously added starter (Sc), and optionally, an initially charged starter (Si). The continuously added starter comprises at least about 2 equivalent percent of the total starter used. The process enables the use of water and low molecular weight polyol starters in DMC-catalyzed polyol synthesis. In addition, the process gives polyether polyols having reduced levels of high molecular weight polyol tail, which can adversely affect polyurethane foam processing.
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