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:
Dec. 11, 2012
Filed:
Aug. 02, 2007
Michiko Yoshida, Yokkaichi, JP;
Takeyuki Doi, Yokkaichi, JP;
Naoya Maeda, Yokkaichi, JP;
Hisashi Kimura, Yokkaichi, JP;
Michiko Yoshida, Yokkaichi, JP;
Takeyuki Doi, Yokkaichi, JP;
Naoya Maeda, Yokkaichi, JP;
Hisashi Kimura, Yokkaichi, JP;
Mitsubishi Chemical Corporation, Tokyo, JP;
Abstract
The present invention provides a method for producing a polyester resin, comprising carrying out a hot-water treatment and a heat treatment, in this order, of polyester prepolymer particles obtained by melt polycondensation of a dicarboxylic acid component and a diol component. The hot-water treatment comprises bringing the polyester prepolymer particles with an intrinsic viscosity of from at least 0.10 dL/g to at most 1.0 dL/g and with a density of at most 1.36 g/cminto contact with hot water at a temperature higher than the glass transition temperature of the polyester prepolymer particles and less than 100° C., under the condition satisfying the following formula (1):40≦()6000  (1)