发明名称 |
Calcium-based catalyst system |
摘要 |
The process and catalyst system of this invention can be utilized to synthesize a highly random styrene-butadiene rubber having a high trans content by solution polymerization. The styrene-butadiene rubber made by the process of this invention can be utilized in tire tread rubbers that exhibit improved wear characteristics. This invention more specifically reveals a catalyst system for use in isothermal polymerizations which consists essentially of (a) an organolithium compound, (b) a calcium alkoxide and (c) a lithium alkoxide. The subject invention further discloses a process for synthesizing a random styrene-butadiene rubber having a low vinyl content by a process which comprises copolymerizing styrene and 1,3-butadiene under isothermal conditions in an organic solvent in the presence of a catalyst system which consists essentially of (a) an organolithium compound, (b) a calcium alkoxide and (c) a lithium alkoxide. An amine can also be added to the catalyst system to increase the molecular weight (Mooney viscosity) of the rubber.
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申请公布号 |
US2005181935(A1) |
申请公布日期 |
2005.08.18 |
申请号 |
US20050106813 |
申请日期 |
2005.04.15 |
申请人 |
HALASA ADEL F.;HSU WEN-LIANG;ZUPPO JOHN R.III |
发明人 |
HALASA ADEL F.;HSU WEN-LIANG;ZUPPO JOHN R.III |
分类号 |
C08F136/08;C08F236/10;(IPC1-7):B01J31/00 |
主分类号 |
C08F136/08 |
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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