Title:
CO-POLYESTER RESIN
Document Type and Number:
WIPO Patent Application WO/2024/070037
Kind Code:
A1
Abstract:
With respect to a co-polyester resin produced by copolymerizing diethylene glycol and sodium sulfoisophthalate, the present invention solves the problem of the dirtiness of a die and the adhesion of a foreign material to a product such as a film, a molded article and a fiber when the product is produced continuously, and the problem of the discoloration of a resin and the decrease in the molecular weight of the resin when the resin is recycled. Provided is a co-polyester resin containing terephthalic acid as a main ingredient of dicarboxylic acid components and ethylene glycol as a main ingredient of glycol components, the co-polyester resin being characterized in that: when the total amount of the dicarboxylic acid components in all of polyester resin components is defined as 100 mol%, the content ratio of a terephthalic acid component to all of the dicarboxylic acid components is 80 to 94.95 mol% and the content ratio of an aliphatic acid having 2 to 4 carbon atoms to all of the dicarboxylic acid components is 5 to 20 mol%, and the content ratio of sodium sulfoisophthalate to all of the dicarboxylic acid components is 0.05 to 10 mol%; when the total amount of the glycol components is defined as 100 mol%, the content ratio of diethylene glycol to all of the glycol components is 1 to 22 mol%; the content of a free cyclic monomer composed of terephthalic acid, sodium sulfoisophthalate and ethylene glycol is 40 ppm or less; and the content of a free linear oligomer composed of terephthalic acid, sodium sulfoisophthalate and ethylene glycol is 60 ppm or less.
Inventors:
SASAKI HIRONAO (JP)
TOGAWA KEIICHIRO (JP)
HIRASAWA FUJIO (JP)
HIRONAKA NOBUYUKI (JP)
SHIMIZU HIDEKI (JP)
WATANABE CHISA (JP)
YAMANE RYOUHEI (JP)
TOGAWA KEIICHIRO (JP)
HIRASAWA FUJIO (JP)
HIRONAKA NOBUYUKI (JP)
SHIMIZU HIDEKI (JP)
WATANABE CHISA (JP)
YAMANE RYOUHEI (JP)
Application Number:
PCT/JP2023/018596
Publication Date:
April 04, 2024
Filing Date:
May 18, 2023
Export Citation:
Assignee:
TOYOBO MC CORP (JP)
International Classes:
C08G63/688
Foreign References:
| JP2021017490A | 2021-02-15 | |||
| JPH0243047A | 1990-02-13 | |||
| JP2008111076A | 2008-05-15 | |||
| JP2007284599A | 2007-11-01 |
Attorney, Agent or Firm:
KAZAHAYA, Nobuaki et al. (JP)
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