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Polyester resin composition, process for producing the same, and polyester film

一种聚酯树脂、制造方法的技术，应用在聚酯薄膜领域，能够解决困难等问题，达到异物少、色调优良、防止油剂的污染的效果

Inactive Publication Date: 2007-05-09
TORAY IND INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, even with these methods, it is very difficult to industrially obtain polyester with a certain quality because the degree of polymerization of the obtained polyester varies.
[0009] In addition, Patent Document 5 describes a technique for reducing cyclic compounds by heat treatment in an inert gas atmosphere. However, even in this method, although the amount of cyclic triploids can indeed be reduced, there are Problems with polymer coloring

Method used

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  • Polyester resin composition, process for producing the same, and polyester film
  • Polyester resin composition, process for producing the same, and polyester film
  • Polyester resin composition, process for producing the same, and polyester film

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0156] Add about 123 g of bis(hydroxyethyl) terephthalate in advance to a slurry of 100 kg of high-purity terephthalic acid (manufactured by Mitsui Chemicals) and 45 kg of ethylene glycol (manufactured by Nippon Shokubai Co., Ltd.). Add them sequentially to maintain a temperature of 250 ° C, a pressure of 1.2 × 10 5 In the esterification reaction tank of Pa, after the feeding was completed, the esterification reaction was further performed for 1 hour, and 123 kg of the esterification reaction product was transferred to the polymerization tank.

[0157]Next, in the above-mentioned polymerization reaction tank in which the esterification reaction product was transferred, 10 ppm of titanium sodium lactate chelate was added in terms of titanium atomic weight, and then 100 ppm of phosphorus-based antioxidant "PEP45" was added to the polymer. (registered trademark), add the magnesium acetate solution that is 70ppm by magnesium atomic weight, add the phosphoric acid that is 10ppm by ...

Embodiment 2

[0160] In Example 1, heat treatment was carried out in the same manner as in Example 1, except that the predetermined torque was lowered and the fragments obtained after the polymerization had an intrinsic viscosity of 0.45 dl / g were heat-treated to obtain an intrinsic viscosity of 0.58 dl / g. , the amount of the cyclic triploid is 0.25% by weight of the polymer (this polymer is denoted as polyester composition (B)).

Embodiment 3

[0162] In Example 1, heat treatment was carried out in the same manner as in Example 1, except that the predetermined torque was lowered and the fragments obtained after the polymerization had an intrinsic viscosity of 0.40 dl / g were heat-treated to obtain an intrinsic viscosity of 0.53 dl / g. . The amount of cyclic triploid is 0.20% by weight of polymer (this polymer is designated as polyester composition (C)).

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Abstract

A polyester resin composition having an equivalent spherical diameter of 1 mm to 50 mm, a degree of crystallization of not less than 65% and less than 99%, an intrinsic viscosity of not more than 0.7 dl / g and a cyclic trimer content of not more than 0.4% by weight. This polyester resin composition has an excellent color tone, causes no significant viscosity lowering or viscosity rise, and can withstand a process which is exposed to a long-term heat history. A polyester resin composition having a viscosity suitable for extrusion in a general-purpose manner, a production process thereof, and a polyester film are also provided.

Description

technical field [0001] The present invention relates to a polyester resin composition, a method for producing the same, and a polyester film, and more specifically, to a polyester resin composition having a low content of cyclic compounds (oligomers), good color tone, and a viscosity suitable for general extrusion methods. Ester resin composition, its production method, and polyester film. Background technique [0002] Generally, polyester is a linear polymer synthesized from dicarboxylic acid or its ester-forming derivative and diol or its ester-forming derivative. However, as described in, for example, Non-Patent Document 1, among linear polymers, a cyclic compound is produced based on an equilibrium relationship. It is known that the cyclic compound is a low molecular weight compound, and it is precipitated during the molding process of polyester, or is precipitated on the surface of the product at any time, especially when a solvent is used in the molding process and pr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G63/183B32B27/36C08G63/88C08L67/02
CPCC08L67/02C08G63/183C08K3/10C08L67/00
Inventor 本间良宏坂本纯木村将弘
Owner TORAY IND INC
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