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:
Jan. 08, 1980
Filed:
May. 15, 1978
Kenya Makino, Kuwana, JP;
Koei Komatsu, Yokkaichi, JP;
Yasumasa Takeuchi, Yokohama, JP;
Masayuki Endo, Yokohama, JP;
Japan Synthetic Rubber Co., Ltd., Tokyo, JP;
Abstract
A process for preparing crystalline 1,2-polybutadiene by contacting 1,3-butadiene with a catalyst consisting of (A) a cobalt compound, (B) an organoaluminum compound, (C) water in an amount of 0.25 to 1.5 mole per mol of said organoaluminum compound, and (D) an organic phosphorus compound in a halogenated hydrocarbon solvent to polymerize the butadiene, characterized in that as said organic phosphorus compound there is used a compound represented by the formula: ##STR1## wherein R.sup.1 is an alkyl or aryl group, and R.sup.2 and R.sup.3 represent independently hydrogen, or alkyl or aryl groups. This process can produce 1,2-polybutadiene having a degree of crystallization of 25 to 50% in a high yield at a temperature of from 0.degree. to 30.degree. C.