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:
Apr. 25, 1978
Filed:
Mar. 11, 1976
Applicant:
Inventors:
Assignee:
Chisso Corporation, Osaka, JA;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
C08F / ;
U.S. Cl.
CPC ...
2524 / ; 526140 ; 526142 ;
Abstract
A method for activating a catalyst for propylene polymerization before polymerization is proposed. According to this method, a catalyst which has stability at the time of use and reduces the ratio of amorphous polymer at the time of polymerization is obtained. Said method comprises causing a catalyst dispersion prepared by mixing a specified .delta.-type titanium trichloride composition and an alkylaluminum trichloride in an inert solvent and maintained at a temperature of 10.degree. to 50.degree. C, to absorb a small amount of propylene in an amount of 0.5 to 5 times by weight that of said .delta.-type titanium trichloride.