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. 18, 2003
Filed:
Apr. 10, 2002
Osamu Kimura, Ichihara, JP;
Takamasa Fujii, Ichihara, JP;
Satoshi Bandai, Ichihara, JP;
Takashi Kitamura, Ichihara, JP;
Toshifumi Fukunaga, Ichihara, JP;
Masato Murakami, Ichihara, JP;
UBE Industries, Ltd., , JP;
Abstract
A polymer of ethylenically unsaturated monomer, for example, 1,3-butadiene, having a desired molecular weight and distribution thereof is produced, with a high stability, by preparing a solution of hydrogen in an inert organic solvent for the monomer in which a vapor-liquid phase equilibrium of hydrogen is attained, and then by addition-polymerizing the monomer in the hydrogen-dissolved inert organic solvent in the presence of a catalyst preferably including a metallocene complex of transition metal compound, an inert compound of a non-coordination anionic compound with a cationic compound, an organic metal (aluminum) compound and, optionally, water.