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. 22, 1991
Filed:
May. 18, 1990
Applicant:
Inventor:
Shiroh Gotoh, Yokkaichi, JP;
Assignee:
Mitsubishi Petrochemical Company Limited, Tokyo, JP;
Primary Examiner:
Int. Cl.
CPC ...
C08F / ; C08F / ; C08F / ;
U.S. Cl.
CPC ...
525313 ; 525314 ; 526336 ;
Abstract
An unsaturated copolymer of propylene and the branched diene which is 6-methyl-1,6-octadiene and/or 7-methyl-1,6-octadiene, and optionally, ethylene is produced by a two-step process wherein in a first polymerization step homopolymerization of propylene is conducted until the propylene polymer amounts to 0.01 to 10% by weight of the total and final copolymer, and in a second polymerization step the random copolymerization of propylene, 6-methyl-1,6-octadiene and/or 7-methyl-1,6-octadiene, and optionally, ethylene is then conducted as a continuation of the first step polymerization, whereby a copolymer of a specified characteristics is produced.