Title:
CATALYST FOR CONJUGATE DIENE POLYMERIZATION
Document Type and Number:
Japanese Patent JPS591508
Kind Code:
A
Abstract:
The invention relates to a catalyst system comprising (a) a compound of a rare earth element and, as cocatalyst, a second component (b) comprising an organomagnesium compound. In the polymerisation of a conjugated diene this catalyst gives a polymer having a very high content of trans 1,4 isomer. A third component (c) which is a Lewis acid alters the reaction to give a polymer having a very high content of cis 1,4 isomer. If desired reaction can be initiated using components (a) and (b) alone and component (c) then added at the desired conversion to produce a block polymer having a block of high trans content followed by a block of high cis content.
Inventors:
DERETSUKU KEISU JIENKINZU
Application Number:
JP5772683A
Publication Date:
January 06, 1984
Filing Date:
April 01, 1983
Export Citation:
Assignee:
ENOTSUKUSHII CHEM LTD
International Classes:
C08F4/00; C08F4/50; C08F4/60; C08F36/04; (IPC1-7): C08F4/52; C08F36/04
Attorney, Agent or Firm:
Hideto Asamura
Next Patent: PRODUCTION OF POLYMERIZABLE POLYMER