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:
Jun. 27, 2017
Filed:
Apr. 19, 2013
Applicant:
Musashino Chemical Laboratory, Ltd., Chuo-ku, Tokyo, JP;
Inventors:
Yukiko Tokushige, Tokyo, JP;
Tsuyoshi Aoki, Tokyo, JP;
Koichiro Suzuki, Tokyo, JP;
Jun Machida, Kitaibaraki, JP;
Assignee:
MUSASHINO CHEMICAL LABORATORY, LTD., Tokyo, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
C08G 63/08 (2006.01); C08G 63/06 (2006.01); C08G 63/90 (2006.01); C08L 67/04 (2006.01);
U.S. Cl.
CPC ...
C08G 63/08 (2013.01); C08G 63/06 (2013.01); C08G 63/90 (2013.01); C08L 67/04 (2013.01);
Abstract
Provided is a method for purifying an aliphatic polyester which reduces coloring of the aliphatic polyester, reduces the amount of residual monomer and residual catalyst, and improves stability and appearance. This method for purifying an aliphatic polyester subjects an aliphatic polyester containing a monomer to heat treatment under dry air containing oxygen at a temperature at or above the melting point of the monomer and at or below the melting point of the aliphatic polyester.