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:
Mar. 09, 1999
Filed:
Jul. 28, 1997
Mitsuo Miura, Ibaraki-ken, JP;
Kyohei Takakuwa, Ibaraki-ken, JP;
Takayasu Fujimori, Ibaraki-ken, JP;
Maki Ito, Ibaraki-ken, JP;
Mitsubishi Gas Chemical Company, Inc., Tokyo, JP;
Abstract
A process for producing an aliphatic polyester carbonate which comprises reacting (1) an aliphatic dicarboxylic acid compound containing succinic acid as a main component, (2) an aliphatic dihydroxy compound containing 1,4-butanediol as a main component, and (3) (a) a polyhydric alcohol having 3 or more hydroxyl groups in a molecule, (b) a polybasic carboxylic acid compound having 3 or more carboxyl groups in a molecule, or (c) a polybasic carboxylic acid having one or more hydroxyl groups in a molecule to obtain an aliphatic polyester oligomer and reacting the obtained aliphatic polyester oligomer and a carbonate compound, wherein the aliphatic polyester carbonate has a melt tension of 1.5 g or more at 190.degree. C. and at an extrusion rate of 10 mm/minute; a process for producing an aliphatic polyester carbonate which comprises reacting above components (1) and (2) to obtain an aliphatic polyester oligomer and reacting the obtained aliphatic polyester oligomer, above component (3) (a), and a carbonate compound, wherein the aliphatic polyester carbonate has the same properties; and aliphatic polyester carbonates produced by these processes. The aliphatic polyester carbonate is branched and biodegradable, has a high molecular weight, and shows higher melt tension and more excellent molding property in comparison with conventional linear aliphatic polyester carbonates in molding of the polyester carbonate to prepare films, sheets, fibers, and other molded products.