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Method for producing polyester compositions

A manufacturing method and composition technology, which is applied in the field of polyester composition manufacturing, can solve problems such as the reduction of mechanical properties, and achieve the effect of excellent hydrolysis resistance

Active Publication Date: 2013-07-03
TORAY IND INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] However, since polyester has lower mechanical properties due to hydrolysis, various studies have been conducted to suppress hydrolysis when used for a long period of time or when used in a humid state.

Method used

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  • Method for producing polyester compositions
  • Method for producing polyester compositions
  • Method for producing polyester compositions

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1）

[0066] A reaction system containing 105 parts by weight of bis(hydroxyethyl) terephthalate (equivalent to 100 parts by weight of polyethylene terephthalate [hereinafter referred to as PET]) in advance in the esterification reaction device The temperature inside was kept at 245-255° C., and at the same time, a serpentine pump was used to supply a slurry formed by 86 parts by weight of terephthalic acid and 37 parts by weight of ethylene glycol into the reaction system to perform esterification and distill water. When the esterification reaction rate reaches 95%, the esterification reaction is terminated to obtain an esterification reaction product with a COOH terminal group amount of 334 eq / ton. 105 parts by weight of the obtained esterification reaction product (equivalent to 100 parts by weight of PET) was charged into a polymerization device with a distillation device, and 0.06 parts by weight of manganese acetate (equivalent to 2.4mol / ton), 0.03 parts by weight of antimony t...

Embodiment 2～9、 comparative example 1～3）

[0069] A polyester composition was obtained in the same manner as in Example 1 except for changing the amount of ethylene glycol to be added and the number of times of addition.

[0070] The polyester compositions obtained in Examples 2 to 7 also had sufficient hydrolysis resistance.

[0071] The polyester compositions obtained in Examples 8 and 9 had the same good hydrolysis resistance as in Example 1.

[0072] In Comparative Example 1, ethylene glycol was not added, and the amount of COOH terminal groups when alkali metal phosphate was added exceeded the upper limit. Therefore, the amount of COOH terminal groups in the polyester composition was high, and sufficient hydrolysis resistance could not be obtained.

[0073] In Comparative Example 2, since the amount of COOH terminal groups after the addition of ethylene glycol exceeded the upper limit, the amount of COOH terminal groups in the polyester composition was high, and sufficient hydrolysis resistance could not be obtain...

Embodiment 10）

[0077] A polyester composition was obtained in the same manner as in Example 1 except that unreacted ethylene glycol was not distilled off but refluxed when ethylene glycol was added. The polyester composition has sufficient hydrolysis resistance. The results are shown in Table 3.

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Abstract

Provided is a method for producing polyester compositions that are suitable for uses of films having excellent resistance to hydrolysis. The polyester production method, which esterifies dicarboxylic acid components and diol components and then performs polycondensation, is a polyester composition production method wherein the diol component is added two or more times from the completion of the esterification reaction until the beginning of the polycondensation reaction, and alkali metal phosphate is added with the amount of the COOH end group of the esterified product being 150 eq / ton or less.

Description

technical field [0001] The present invention relates to a method for producing a polyester composition having good hydrolysis resistance. Background technique [0002] Polyester has excellent mechanical properties, thermal properties, chemical resistance, electrical properties, and formability, and can be used in various applications. [0003] However, since polyester has lowered mechanical properties due to hydrolysis, various studies have been made to suppress hydrolysis when used for a long period of time or when used in a humid state. In particular, a film for a solar cell is required to have an outdoor durability of 20 years or more, and thus high hydrolysis resistance is required. [0004] prior art literature [0005] patent documents [0006] Patent Document 1 describes a method for producing a polyester containing a phosphate of an alkali metal or an alkaline earth metal. [0007] Moreover, patent document 2 describes the manufacturing method of the polyester co...

Claims

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Application Information

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IPC IPC(8): C08G63/78C08G63/16
CPCC08G63/20C08K2003/324C08K3/32C08G63/78C08L67/02C08G63/16C08K5/0066C08G63/80
Inventor 砂子麻由美小岛博二坂本纯
Owner TORAY IND INC
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