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:
Jul. 23, 2013
Filed:
Jun. 19, 2008
Norihiro Yoshida, Ichihara, JP;
Hijiri Aoki, Ichihara, JP;
Takahito Mita, Ichihara, JP;
Ami Yamaguchi, Ichihara, JP;
Kazuhiko Haba, Ichihara, JP;
Goro Sawada, Ichihara, JP;
Norihiro Yoshida, Ichihara, JP;
Hijiri Aoki, Ichihara, JP;
Takahito Mita, Ichihara, JP;
Ami Yamaguchi, Ichihara, JP;
Kazuhiko Haba, Ichihara, JP;
Goro Sawada, Ichihara, JP;
Maruzen Petrochemical Co., Ltd., Tokyo, JP;
Abstract
To provide a novel ABA-type triblock copolymer of vinyl ether series, comprising polyvinyl ether and an oxystyrene-series unit, and a process of producing the ABA-type copolymer at a series of steps. The invention relates to a novel ABA-type triblock copolymer comprising Segment A comprising an oxystyrene-series repeat unit (a) and Segment B comprising a vinyl ether-series repeat unit (b), in which the Segment A and the Segment B are bonded together with a single bond, and to a simple process of producing the same. The triblock copolymer can be produced at a series of steps in a simple manner, comprising living cationic polymerization of a vinyl ether-series monomer such as ethyl vinyl ether in the presence of a bifunctional initiator and a Lewis acid, and subsequently adding an oxystyrene-series monomer such as p-hydroxystyrene for living cationic polymerization.