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Polyethylene terephthalate composition, and method for producing same

A technology for polyethylene terephthalate and its manufacturing method, which is applied in the field of polyethylene terephthalate compositions, can solve problems such as insufficient optical applications and difficulty in applying optical applications, and achieve excellent optical properties Effect

Active Publication Date: 2015-05-20
TORAY IND INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

), it is difficult to apply to optical applications
[0006] In Patent Document 2, a method for producing polyethylene terephthalate with few impurities is described, but a technology containing 31 or more impurities (fish eyes) per 8 square centimeters is disclosed. saying is not enough

Method used

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  • Polyethylene terephthalate composition, and method for producing same
  • Polyethylene terephthalate composition, and method for producing same

Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0044] (A. Intrinsic viscosity: IV)

[0045] Under the conditions of 160°C and 20 minutes, 0.1 g of the polymer was dissolved in 10 ml of o-chlorophenol, and the measurement was performed at 25°C.

[0046] (B. Quantification of the amount of phosphorus and manganese in the polymer)

[0047] Measurement was performed using a fluorescent X-ray analyzer (model: 3270) manufactured by Rigaku Denki Co., Ltd.

[0048] (C. Quantification of the amount of alkali metal in the polymer)

[0049] Quantification was carried out by atomic absorption spectrophotometry (manufactured by Hitachi, Ltd.: polarized Zeeman atomic absorption spectrophotometer 180-80. flame: acetylene-air).

[0050] (D. Carboxylic acid end group content)

[0051] The chips of the polyethylene terephthalate composition were selected and measured by the method of Maulice et al. 2 g of polymer chips were dissolved in 50 ml o-cresol / chloroform (weight ratio 7 / 3), and the supernatant after centrifugal precipitation was...

reference example 1

[0088] (reference example 1) the preparation method of sodium dihydrogen phosphate ethylene glycol solution

[0089] In 10 L of ethylene glycol heated to 60° C., 4000 mmol of sodium dihydrogen phosphate dihydrate was added with stirring to prepare a 400 mmol / L sodium dihydrogen phosphate dihydrate ethylene glycol solution. The prepared solutions were used after being diluted to the concentrations specified in the respective examples.

Embodiment 1

[0091] Use a snake pump (snake pump) to add 114 parts by weight of bishydroxyethyl terephthalate (equivalent to 100 parts by weight of polyethylene terephthalate (PET)) for 3.5 hours. A slurry consisting of 86 parts by weight of terephthalic acid and 37 parts by weight of ethylene glycol was supplied to the apparatus (ES tank), and the esterification reaction was carried out while controlling the temperature of the reactant to 245°C to 255°C.

[0092] After the esterification reaction was completed, 114 parts by weight of bishydroxyethyl terephthalate (100 parts by weight of PET) obtained was transferred to a polymerization tank, and 0.07 parts by weight of manganese acetate tetrahydrate (5% ethylene glycol solution , in terms of manganese element, equivalent to 2.8mol / ton), antimony trioxide 0.03 parts by weight. Afterwards, under stirring at a peripheral speed of 4m / s, add 0.019 parts by weight of phosphoric acid (corresponding to 1.9mol / ton) and add 0.027 parts by weight of...

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Abstract

A polyethylene terephthalate composition which contains an alkali metal phosphate compound in an amount of 1.0 to 3.0 mol / ton inclusive in terms of alkali metal element content, contains phosphorus element in an amount of 1.5 to 5.0 mol / ton inclusive, contains white foreign matters containing phosphorus element and an alkali metal element and having a size of 50 μm or more in an amount of 1 ppm by volume or less, has an inherent viscosity of 0.65 dl / g or more and less than 0.90 dl / g, has a cyclic trimer content of 0.6 wt% or less, contains a carboxylic acid terminal group in an amount of 15 eq / ton or less, and has an increased amount of the carboxylic acid terminal group (ΔCOOH) of 30 eq / ton or less when the composition is subjected to a wet heat treatment (at 155˚C, under a 100% RH atmosphere, for 4 hours). Provided are: a polyethylene terephthalate composition which has excellent hydrolysis resistance and is suitable for a front sheet for a solar cell; and a method for producing the polyethylene terephthalate composition.

Description

technical field [0001] The present invention relates to a polyethylene terephthalate composition excellent in hydrolysis resistance and a method for producing the same. Background technique [0002] Polyethylene terephthalate is excellent in mechanical properties, thermal properties, chemical resistance, electrical properties, and moldability, and is used in various applications. [0003] However, since polyethylene terephthalate is hydrolyzed and its mechanical properties are reduced, various studies have been conducted to suppress hydrolysis when it is used for a long time or when it is used in a humid state. . In addition, in optical applications, in the case of processing steps and long-term use, as the crystallization of the film proceeds, film fouling (white turbidity) caused by precipitation of oligomers such as cyclic trimers becomes a cause of deterioration of optical characteristics. reason. Especially for the film used for the front sheet of the solar cell, it ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L67/02C08G63/82C08K5/52
CPCC08G63/82C08K2003/324C08G63/183
Inventor 小岛博二松本麻由美坂本纯
Owner TORAY IND INC