发明名称 |
Method for preparing polydiorganosiloxanes partially end-blocked with substituted silethylene groups |
摘要 |
This specification describes and claims a method for producing polydiorganosiloxanes partially end-blocked with substituted silethylene groups. The method comprises the steps of: A) mixing a hydroxyl end-blocked polydiorganosiloxane with a silicon-containing compound having at least two silicon-bonded hydrogen atoms and a -Si(R')3 end-blocked siloxane in the presence of an acidic polymerisation catalyst to form a mixture wherein each R' independently denotes a monovalent hydrocarbon or halohydrocarbon having 1 to 6 carbon atoms, B) conducting a reaction with the mixture of step A so as to produce a polydiorganosiloxane having at least one silicon-bonded hydrogen atom and at least one -Si (R')3 group and C) adding a substituted alkenylsilane in the presence of a hydrosilylation catalyst to the reaction product obtained from step B to form a polydiorganosiloxane partially end-blocked with substituted silethylene groups. A chain extender may also be included with the reaction mixture of step A and/or the reaction product of step B. The polydiorganosiloxanes are suitable for use in sealant compositions.
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申请公布号 |
US6037434(A) |
申请公布日期 |
2000.03.14 |
申请号 |
US19980172429 |
申请日期 |
1998.10.14 |
申请人 |
DOW CORNING S. A. |
发明人 |
DE BUYL, FRANCOIS;DAMME, ERIC;LEEMPOEL, PATRICK |
分类号 |
C08L83/05;C08G77/38;C08G77/50;C08L83/07;(IPC1-7):C08G77/06 |
主分类号 |
C08L83/05 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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