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. 31, 2000
Filed:
Apr. 27, 1999
Yuji Terado, Kanagawa-ken, JP;
Hiroshi Suizu, Kanagawa-ken, JP;
Masatoshi Takagi, Kanagawa-ken, JP;
Masanobu Ajioka, Kanagawa-ken, JP;
Shoji Hiraoka, Yamaguchi-ken, JP;
Masayuki Sakai, Hiroshima-ken, JP;
Hiroyuki Suzuki, Kanagawa-ken, JP;
Ryo Shinagawa, Kanagawa-ken, JP;
Shinji Ogawa, Kanagawa-ken, JP;
Yasushi Kotaki, Tokyo-to, JP;
Mitsui Chemicals, Inc., , JP;
Abstract
The invention provides a process for producing high-molecular aliphatic polyesters capable of being substitutes for general-purpose resins that are required to have high toughness, in a simplified manner and at a high volume efficiency. Specifically, in the process, used as the starting material is an easily-available, low-molecular aliphatic polyester prepolymer to be prepared through polycondensation of inexpensive materials of an aliphatic hydroxycarboxylic acid such as lactic acid, glycolic acid or the like, an aliphatic polyalcohol such as butanediol or the like, and an aliphatic polycarboxylic acid such as succinic acid or the like, and the starting prepolymer is crystallized and thereafter polycondensed in a solid phase in the presence of a catalyst to give the intended, tough and high-molecular aliphatic polyester.