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:
Feb. 17, 2015
Filed:
Oct. 29, 2010
Yoshitaka Kobayashi, Ichihara, JP;
Takanori Nakashima, Ichihara, JP;
Kiyoshi Yukawa, Ichihara, JP;
Yusuke Yamada, Ichihara, JP;
Hajime Aoyama, Ichihara, JP;
Nobuhiro Iwai, Ichihara, JP;
Yoshitaka Kobayashi, Ichihara, JP;
Takanori Nakashima, Ichihara, JP;
Kiyoshi Yukawa, Ichihara, JP;
Yusuke Yamada, Ichihara, JP;
Hajime Aoyama, Ichihara, JP;
Nobuhiro Iwai, Ichihara, JP;
Japan Polypropylene Corporation, Tokyo, JP;
Abstract
A method for producing a propylene-based polymer, including polymerizing propylene or propylene and an α-olefin except propylene in the presence of a catalyst with a horizontal polymerization reactor equipped with stirring vanes rotating around a horizontal axis therein by a continuous vapor-phase polymerization, which removes heat of polymerization by heat of vaporization of a liquefied propylene, wherein the reactor can set a plurality of area sections different in temperature in a horizontal direction inside the reactor, and satisfies at least one of i) a temperature difference, ΔT=Tω−Tα, between an area section including an upstream end of the reactor (Tα) and a downstream end (Tω) thereof is 0.1 to 20° C. and ii) a temperature difference, ΔT=Tx−Tz, between an area section including a catalyst feed part (Tx) and dew point (Tz) of a mix gas in the reactor is 0 to 5° C.