Double metal cyanide catalysts containing cyclic, bidentate complexing agents
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United States of America Patent
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Jan 11, 2000
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N/A
app pub date -
May 18, 1998
filing date -
May 18, 1998
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Expired
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Abstract
Double metal cyanide (DMC) catalysts and methods for making them are disclosed. The catalysts comprise a DMC compound, an organic complexing agent, and optionally, a functionalized polymer. The key component is the complexing agent, which comprises a C.sub.3 -C.sub.5 aliphatic alcohol a cyclic, bidentate compound selected from lactams and lactones. Polyether polyols made from the catalysts contain reduced levels of high-molecular-weight (Mn greater than 400,000) components and consistently perform better in urethane applications such as flexible and molded foams.
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