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:
Oct. 28, 2014
Filed:
Mar. 29, 2012
Masaki Fujita, Otsu, JP;
Megumi Nakanishi, Otsu, JP;
Yoshitake Takahashi, Otsu, JP;
Yasufumi Yamamura, Otsu, JP;
Kazuhiro Tanahashi, Otsu, JP;
Masaki Fujita, Otsu, JP;
Megumi Nakanishi, Otsu, JP;
Yoshitake Takahashi, Otsu, JP;
Yasufumi Yamamura, Otsu, JP;
Kazuhiro Tanahashi, Otsu, JP;
Toray Industries, Inc., , JP;
Abstract
A biodegradable particle including a block copolymer produced by copolymerization of a biodegradable copolymer having a structure composed of hydroxycarboxylic acid a1, whose homopolymer produced by homopolymerization has a glass transition point of not less than 40° C., and hydroxycarboxylic acid a2, whose homopolymer produced by homopolymerization has a glass transition point of not more than −40° C.; a water-soluble polymer comprising a functional group selected from the group consisting of a hydroxyl group, amino group and carboxylic acid group at each of both ends; and a polyvalent compound comprising 2 or more functional groups each selected from the group consisting of a hydroxyl group, amino group and carboxylic acid group; wherein a ratio of mass of said structure composed of hydroxycarboxylic acid a2 to mass of said biodegradable copolymer is 30 to 90% by mass.