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. 20, 1998
Filed:
Sep. 25, 1996
Daisuke Fukuoka, Kuga-gun, JP;
Takashi Tashiro, Kuga-gun, JP;
Koji Kawaai, Kuga-gun, JP;
Junji Saito, Kuga-gun, JP;
Takashi Ueda, Kuga-gun, JP;
Yoshihisa Kiso, Kuga-gun, JP;
Junichi Imuta, Kuga-gun, JP;
Terunori Fujita, Kuga-gun, JP;
Masatoshi Nitabaru, Kuga-gun, JP;
Masayasu Yoshida, Kuga-gun, JP;
Mitsui Petrochemical Industries Ltd., Tokyo, JP;
Abstract
A process for polymerizing propylene utilizes a metallocene catalyst component of the formula (I) ##STR1## wherein M is a transition metal, R.sup.1 is a C.sub.2-6 hydrocarbon, R.sup.2 is a C.sub.6-16 aryl group, X.sup.1 and X.sup.2 are each a halogen atom and Y is a divalent hydrocarbon or a divalent silicon-containing group. Propylene polymers produced thereby have such properties that the triad tacticity of propylene units is high, the proportion of inversely inserted units based on the 2,1-insertion of propylene monomer is in a specific range and the intrinsic viscosity (.eta.), as measured in decahydronaphthalene at 135.degree. C., is in a specific range.