Copolymerized polyester resin

Patent metadata

Field	Value
Publication number	US-2016237207-A1
Application number	US-201415029699-A
Country	US
Kind code	A1
Filing date	Oct 22, 2014
Priority date	Oct 24, 2013
Publication date	Aug 18, 2016
Grant date	—

Abstract

The present invention is a copolymerized polyester resin which contains a dicarboxylic acid component and diol components as constituting components, wherein greater than or equal to 90 mol % of terephthalic acid is contained as the dicarboxylic acid component, 39 to 79 mol % of ethylene glycol, 20 to 60 mol % of neopentyl glycol and 1 to 5 mol % of diethylene glycol are contained as the diol components, the reduced viscosity of the resin is greater than or equal to 0.50 dl/g, the number of contaminants having a particle diameter of greater than or equal to 5 μm is less than or equal to 100 per 1 mm 2 in a sample of the copolymerized polyester resin having a thickness of 0.8 to 0.9 mm. The copolymerized polyester resin has a higher degree of clarification than conventionally known copolymerized polyesters and also has excellent color hue and heat resistance.

First claim

1 - 9 . (canceled)

10 . A copolymerized polyester resin comprising a dicarboxylic acid component and diol components as constituting components, wherein as the dicarboxylic acid component, greater than or equal to 90 mol % of terephthalic acid is contained, and as the diol components, 39 to 79 mol % of ethylene glycol, 20 to 60 mol % of neopentyl glycol, and 1 to 5 mol % of diethylene glycol are contained, and a reduced viscosity is greater than or equal to 0.50 dl/g, and the number of contaminants per 1 mm 2 observed by using a phase-contrast optical microscope in a sample of the copolymerized polyester resin having a thickness of 0.8 to 0.9 mm is less than or equal to 100, the contaminants having a particle diameter of greater than or equal to 5 μm.

11 . The copolymerized polyester resin according to claim 10 , wherein a color L value is greater than or equal to 60, and a color b value is less than or equal to 6.

12 . The copolymerized polyester resin according to claim 10 , wherein as a polymerization catalyst, at least one selected from aluminum compounds and at least one selected from phosphorous compounds are contained in the copolymerized polyester resin.

13 . The copolymerized polyester resin according to claim 12 , which is obtained by esterifying the dicarboxylic acid component and the diol components so that a carboxylic acid group terminal concentration and a hydroxyl group terminal concentration of a reaction intermediate oligomer after termination of the esterification are 400 to 900 eq/ton, and 700 to 1400 eq/ton, respectively, and conducting polycondensation.

14 . The copolymerized polyester resin according to claim 12 , wherein as the diol components, a diol component containing ethylene glycol derived from biomass resources is used.

15 . The copolymerized polyester resin according to claim 10 , which is obtained by esterifying the dicarboxylic acid component and the diol components so that a carboxylic acid group terminal concentration and a hydroxyl group terminal concentration of a reaction intermediate oligomer after termination of the esterification are 400 to 900 eq/ton, and 700 to 1400 eq/ton, respectively, and conducting polycondensation.

16 . The copolymerized polyester resin according to claim 10 , wherein as the diol components, a diol component containing ethylene glycol derived from biomass resources is used.

17 . A heat-shrinkable film comprising the copolymerized polyester resin according to claim 10 .

18 . A heat-shrinkable film comprising the copolymerized polyester resin according to claim 12 .

19 . A molded article comprising the copolymerized polyester resin according to claim 10 .

20 . A molded article comprising the copolymerized polyester resin according to claim 12 .

21 . A sheet comprising the copolymerized polyester resin according claim 10 .

22 . A sheet comprising the copolymerized polyester resin according claim 12 .

23 . An adhesive comprising the copolymerized polyester resin according claim 10 .

24 . An adhesive comprising the copolymerized polyester resin according claim 12 .

Assignees

• Toyo Boseki

Inventors

• Ohashi Hideto
• Hironaka Nobuyuki

Classifications

• C08L67/02

  Polyesters derived from dicarboxylic acids and dihydroxy compounds (C08L67/06 takes precedence) · CPC title

• C08G63/78

  Preparation processes · CPC title

• C09J167/03

  the dicarboxylic acids and dihydroxy compounds having the carboxyl - and the hydroxy groups directly linked to aromatic rings · CPC title

• C09J167/02

  Polyesters derived from dicarboxylic acids and dihydroxy compounds (C09J167/06 takes precedence) · CPC title

• C08J2367/02

  Polyesters derived from dicarboxylic acids and dihydroxy compounds; (C08J2367/06 takes precedence) · CPC title