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Preparation of 1,2-polybutadiene

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专利汇可以提供Preparation of 1,2-polybutadiene专利检索,专利查询,专利分析的服务。并且PURPOSE: To obtain a polybutadiene with a high 1,2-bond content, having a high modulus and improved heat insulating properties, by polymerizing 1,3-butadiene in the presence of a specific catalyst continuously or stepwise at different temperatures.
CONSTITUTION: 1,3-butadiene is polymerized in the presence of a catalyst, prepared by incorporating (A) a complex of a cobalt salt and an electron donative phosphorus compound of formula CoX
2 L
2 (X is acid residue; L is electron donative phosphorus compound having an aryl group) with (B) an organoaluminum compound of formula AlR
3 (R is alkyl or aryl group), e.g. trimethylaluminum, etc. and (C) 0.25W1.5 moles per mole of component (B) of water, in a (halogenated) hydrocarbon solvent, e.g. n-pentane, etc. while changing the polymerization temperature continuously or stewise to form 1,2-polybutadiene. The temperature difference between the early and later stages of polymerization is preferably 10W 70°C.
COPYRIGHT: (C)1979,JPO&Japio,下面是Preparation of 1,2-polybutadiene专利的具体信息内容。

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