The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Sep. 04, 1990
Filed:
Jun. 20, 1988
Applicant:
Inventors:
Assignee:
Japan Synthetic Rubber Company, Ltd., Tokyo, JP;
Primary Examiner:
Int. Cl.
CPC ...
C08F / ; C08F / ;
U.S. Cl.
CPC ...
526138 ; 502117 ; 526139 ; 526335 ; 568 13 ; 585369 ; 585508 ;
Abstract
A catalyst consisting essentially of (A) a cobalt compound and (B) an organic phosphorus compound represented by the formula: ##STR1## wherein R.sup.1 and R.sup.2 are independently hydrogen atoms, alkyl groups or aryl groups, and three X's, which may be the same or different, are electron-donating groups. This catalyst is effectively used in a process for producing a conjugated diene polymer by polymerizing a conjugated diene in a hydrocarbon or halogenated hydrocarbon solvent in the presence of the above catalyst together with (C) an organoaluminum compound and (D) 0.25-1.5 mols, per mol of the organoaluminum compound (C), of water.