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. 21, 2014
Filed:
Apr. 20, 2012
Kotaku Saigusa, Toyko, JP;
Masahiro Yamazaki, Tokyo, JP;
Shunsuke Abe, Tokyo, JP;
Nanako Kuruhara, Tokyo, JP;
Hiroyuki Sato, Toyko, JP;
Kotaku Saigusa, Toyko, JP;
Masahiro Yamazaki, Tokyo, JP;
Shunsuke Abe, Tokyo, JP;
Nanako Kuruhara, Tokyo, JP;
Hiroyuki Sato, Toyko, JP;
Kureha Corporation, Tokyo, JP;
Abstract
Biodegradable aliphatic polyester particles have: (A) an average particle diameter of 10 to 500 μm, and (B) a quantity of heat of low-temperature crystallization calculated as an exotherm attending on crystallization, detected in the course of heating by DSC, of at least 1 J/g, and preferably: (C) a quantity of heat of crystal melting calculated as an endotherm attending on melting of a crystal, detected in the course of the heating, of less than 100 J/g, and (D) a difference between the quantity of heat of crystal melting and the quantity of heat of low-temperature crystallization of less than 90 J/g. A process for producing the particles comprises grinding a particular biodegradable aliphatic polyester having a weight average molecular weight of at least 50,000 at not lower than 0° C. and lower than the glass transition temperature of the polyester while applying high shearing force.