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US 2016/0237207 A1Published application
Copolymerized polyester resin
AssigneeToyobo Co., Ltd.
InventorsHideto OHASHI, Nobuyuki HIRONAKA
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AssigneeToyobo Co., Ltd.
InventorsHideto OHASHI, Nobuyuki HIRONAKA
Estimating the term…
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 mm2 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.
1-9. (canceled)
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 mm2 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.
Dependencies are inferred from the claim text.