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Polyester film for capacitors

A polyester film and capacitor technology, which is applied in the direction of fixed capacitor dielectrics, fixed capacitor components, and applications, can solve problems such as reduced operating efficiency

Inactive Publication Date: 2003-02-12
TEIJIN LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although thin film capacitors can achieve miniaturization and large capacity of capacitors by forming a thinner film as a dielectric, the operation efficiency is reduced in the processing steps of capacitors, especially metal vapor deposition and cutting processing on the film and The operational efficiency of the step of winding a stacked capacitor film element is reduced

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0162] 100 parts by weight of 2,6-naphthalene dicarboxylate, 60 parts by weight of ethylene glycol, and 0.03 parts of manganese acetate tetrahydrate are used as transesterification catalysts, and calcium carbonate particles with an average particle diameter of 1.0 μm and an average particle size of 1.0 μm are added. The kaolin particles (plate-shaped aluminum silicate particles) with a particle size of 0.7 μm are made to contain 0.45% by weight of calcium carbonate particles and 0.3% by weight of kaolin particles. The transesterification reaction is carried out according to the usual method, and then 0.023 parts of trimethyl phosphate are added to Essentially terminates the transesterification reaction.

[0163] 0.024 parts of antimony trioxide was added to the reaction mixture. Next, a conventional polymerization reaction was carried out under high temperature and high vacuum to obtain polyethylene 2,6-naphthalene dicarboxylate (PEN Tg=121° C.) with an intrinsic viscosity of ...

reference example 1

[0168] Each step was performed in the same manner as in Example 1, except that the average mesh gap of the melt filtering screen was 50 μm. The thin film was formed into a film and evaluated as a capacitor element. The results are shown in Table 1. Capacitors have a lot of dishing and a low insulation breakdown voltage. "Comparative Example 1"

reference example 2

[0178] Each step was carried out in the same manner as in Example 3, except that the average mesh gap of the melt filtering screen was 50 μm. The thin film was formed into a film and evaluated as a capacitor element. The results are shown in Table 2. The capacitor has many disks and has a low dielectric breakdown voltage. "Comparative Example 3"

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PUM

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Abstract

A film which is a biaxially oriented film comprising polyethylene-2,6-naphthalenedicaboxylate as a principal component, having a thermal strain ratio RMD (150) in the machine direction of the film at a temperature of 150 DEG C is -1.5%< / =RMD (150)< / =0.0% when the thermal strain ratio RMD (T) in the machine direction of the film at a temperature T DEG C based on the length LMD (t) in the machine direction (MD) of the film at a temperature t DEG C is defined by <DF>RMD (T) = äÄLMD(T) - LMD (35)Ü / LMD (35)ü x 100 (%), < / DF> excellent in insulation characteristics without lowering processing characteristics, especially the characteristics during hot-pressing and suitable as a dielectric for capacitors.

Description

technical field [0001] The present invention relates to a polyester film for capacitors. Background technique [0002] As for capacitors, along with the miniaturization of electrical and electronic devices, their miniaturization and larger capacity are required, while since higher voltages are used for capacitors, improved insulation characteristics are required. In response to this demand, in film capacitors, studies have been conducted on thinner films as dielectrics and reduction of pinholes present in the films. The capacitance per unit volume based on a thin film as a dielectric is inversely proportional to the square of the thickness of the film and proportional to the dielectric constant of the dielectric. Although thin film capacitors can achieve miniaturization and large capacity of capacitors by forming a thinner film as a dielectric, the operation efficiency is reduced in the processing steps of capacitors, especially metal vapor deposition and cutting processing...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01G4/18
CPCH01G4/18Y10S428/91Y10T428/25Y10T428/258Y10T428/259Y10T428/256Y10T428/257Y10T428/31786Y10T428/31797C08J5/18
Inventor 古谷幸治楠目博饭田真
Owner TEIJIN LTD
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