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. 16, 1985
Filed:
Sep. 30, 1983
Toru Tanaka, Yamato, JP;
Nobuaki Gohko, Kurashiki, JP;
Osamu Kishiro, Atsugi, JP;
Atsushi Murakami, Kawasaki, JP;
Mitsubishi Chemical Industries Ltd., Tokyo, JP;
Abstract
A polyolefin is producing by polymerizing ethylene or copolymerizing ethylene and the other .alpha.-olefin at 50.degree. to 100.degree. C. in a hydrocarbon solvent in the presence of a catalyst system of an organoaluminum compound and a transition metal compound component which is a solid catalytic component containing a magnesium compound and a titanium compound under the condition (a) two step polymerizations of a first polymerization step and a second polymerization step in the presence of a reaction mixture obtained by said first polymerization step; (b) a polymerization in the presence of hydrogen at a molar ratio of H.sub.2 to C.sub.2 H.sub.4 (vapor phase) of 0.01-0.8 to produce a polymer A having a viscosity average molecular weight of 2.times.10.sup.5 -7.times.10.sup.5 at a ratio of 30 to 70 wt. % based on the total polymer in one of said first or second polymerization step and a polymerization in the presence of hydrogen at a molar ratio of H.sub.2 to C.sub.2 H.sub.4 (vapor phase) of 1.5-15 to produce a polymer B having a viscosity average molecular weight of 1.times.10.sup.4 - 4.times.10.sup.4 at a ratio of 70 to 30 wt. % based on the total polymer in the other polymerization step to give a ratio of a viscosity average molecular weight of polymer A to a viscosity average molecular weight of polymer B of 15 to 55; (c) said production of said polymer A as a copolymer of ethylene and other .alpha.-olefin and said production of said polymer B as a homopolymer of ethylene or a copolymer of ethylene and the other .alpha.-olefin; and (d) said production of the total polymer as a polymer having a melt index of less than 0.5 g/10 min.