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Polyethylene terephthalate resin composition and film formed from same

A technology of polyethylene terephthalate and resin composition, which is applied in the field of polyethylene terephthalate resin composition and films formed therefrom, can solve the problem that the gelation rate is reduced and cannot be obtained. Sufficient improvement, problems such as M/P, etc., to achieve the effect of less color change and oligomer generation, excellent electrostatic application castability, and less oligomer generation

Active Publication Date: 2018-06-08
TORAY IND INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The polyethylene terephthalate resin composition described in Patent Document 1 is adjusted to have a high M / P, so that the gelation rate when left at 300°C for 5 hours at an oxygen concentration of 20% decreases. , but high M / P promotes thermal decomposition and cannot obtain sufficient heat resistance of the composition
In addition, since magnesium acetate is used, further reduction in the gelation rate over a long period of time cannot be achieved
[0007] Patent Document 2 describes an example using manganese acetate, but the M / P is high, and a sufficient gel-inhibiting effect cannot be obtained
[0008] Patent Document 3 also describes an example using manganese acetate, but the amount of antimony is large, and concerns about solution turbidity and defects caused by antimony
In addition, regarding the gelation rate, it is not expected to be sufficiently improved

Method used

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  • Polyethylene terephthalate resin composition and film formed from same
  • Polyethylene terephthalate resin composition and film formed from same
  • Polyethylene terephthalate resin composition and film formed from same

Examples

Experimental program
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Effect test

Embodiment 1

[0133]The one having all 5 tanks including the esterification reaction tank consisting of the first esterification reaction tank and the second esterification reaction tank, the first polycondensation reaction tank, the second polycondensation reaction tank, and the third polycondensation reaction tank following it is used Continuous polymerization unit. For the first esterification reaction tank, react at a reaction temperature of 240-255°C until the esterification reaction rate is 90-95%, and for the second esterification tank, react at a reaction temperature of 255°C until the esterification reaction rate is 90-95%. The conversion reaction rate is 97%, and the polycondensation reaction is performed at a temperature of 260°C in the first polycondensation reaction tank, at a temperature of 275°C in the second polycondensation reaction tank, and at a temperature of 280°C in the third esterification reaction tank, so as to achieve the target intrinsic viscosity Allow the reacti...

Embodiment 2、3

[0141] The amount of manganese acetate added so that the amount of metal contained in Table 2 was changed to 0.014% by weight (equivalent to 0.570 mol / t) and 0.028% by weight relative to the polyethylene terephthalate resin composition. % (corresponding to 1.14 mol / t), and the polyethylene terephthalate resin composition and film were obtained by the method similar to Example 1 except this. Although the gelation ratio of the polyethylene terephthalate resin composition increased by changing the amount of manganese acetate added, it was at a level that did not pose a problem. In Example 3, although the turbidity of the solution increased due to the increase in the amount of the manganese element, the film defect was at a level without any problem.

Embodiment 4～6

[0143] 0.0046% by weight (equivalent to 0.214 mol / t) of magnesium acetate, 0.00045% by weight (corresponding to 0.059mol / t) of calcium acetate, 0.0075% by weight (corresponding to 0.735mol / t) of lithium acetate, except that, obtain polyethylene terephthalate by the same method as in Example 1 Alcohol ester resin compositions and films. In Examples 4, 5, and 6, due to the addition of a highly active metal catalyst, the gelation rate of the polyethylene terephthalate resin composition increased, and the amount of production of linear oligomers also increased, but Membrane defects were at a non-problematic level.

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Abstract

Provided is a polyethylene terephthalate resin composition which has excellent transparency, heat resistance and wet heat resistance and is suppressed in the formation of a gel that leads to film defects, while being capable of reducing the amount of linear oligomers generated during a melting process, and which is suitable for industrial material applications, especially for mold release applications. A polyethylene terephthalate resin composition which is characterized by having an elemental manganese content of 30-60 ppm, an elemental potassium content of 2-10 ppm, an elemental antimony content of 70-150 ppm, a molar ratio of metal elements to elemental phosphorus (M / P = (M1 + M2 / 2) / P) satisfying the formula below, and a gelation rate of 5% by weight or less. 0.6 <= (M1 + M2 / 2) / P <= 1.3(In the formula, M1 represents the content (mol / t) of a divalent metal element selected from among Mg, Mn and Ca; M2 represents the content (mol / t) of a monovalent metal element selected from among Li, Na and K; and P represents the content (mol / t) of elemental phosphorus.)

Description

technical field [0001] The present invention relates to a polyethylene terephthalate resin composition and a film formed therefrom. Background technique [0002] Polyethylene terephthalate resin compositions are excellent in mechanical properties, thermal properties, chemical resistance, electrical properties, and moldability, and are widely used in various applications, and demand is increasing. [0003] However, as its uses and needs expand, the properties and productivity required for polyesters are also becoming stricter in the respective fields of use. [0004] Usually, the polyethylene terephthalate resin composition is melted and extruded at a temperature above the melting point of polyester, such as 250°C to 300°C, during molding processing, but this temperature condition causes polyester thermal decomposition, and oxidative decomposition in the presence of oxygen. As a result, there is a problem that gel-like foreign substances are generated and defects on the sur...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L67/02C08G63/183C08J5/18C08K3/08
CPCC08J5/18C08K3/08C08G63/183C08L67/02C08G63/83C08G63/866C08G63/87C08J2367/02C08K2003/026C08L67/03C08L2203/16
Inventor 藤原奖斋浩光吉村仁上垣内善规
Owner TORAY IND INC
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