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Electret film and electret comprising same

An electretization and electret technology, which is applied to the electret field with a conductive layer, can solve the problems such as the increase of the temperature of the electret, the decrease of the performance, and the decrease of the performance of the electret itself, so as to achieve high energy conversion efficiency. , the effect of high mass productivity

Active Publication Date: 2013-01-16
YUPO CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0012] As a method of providing a conductive layer, there are usually coating of conductive paint, vapor deposition of metal, etc., and the coating method has the following disadvantages: when the temperature is excessively increased in the drying process, the performance of the electret itself is reduced
In addition, the evaporation method has the disadvantage that the temperature of the electret rises due to the direct contact between the vaporized metal and the electret, and performance degradation occurs similarly to the coating method.

Method used

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  • Electret film and electret comprising same
  • Electret film and electret comprising same
  • Electret film and electret comprising same

Examples

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Embodiment

[0223] Hereinafter, the present invention will be more specifically described using Examples, Comparative Examples, and Test Examples. Materials, usage amounts, proportions, operations, etc. shown below can be appropriately changed without departing from the spirit of the present invention. Therefore, the scope of the present invention is not limited to the specific examples shown below. In addition, "%" described below is "% by weight" unless otherwise indicated.

[0224] Table 1 summarizes the materials used in the production examples, examples, and comparative examples of the electretized thin film (ii) of the present invention.

[0225] [Table 1]

[0226]

[0227]

manufacture example 1

[0229] After kneading the thermoplastic resin composition a with an extruder set at 230°C, it was supplied to an extrusion die set at 250°C, extruded into a sheet, and cooled by a cooling device to obtain a non- Stretch sheet. This non-stretched sheet was heated to 135° C., and stretched 5 times in the longitudinal direction using a plurality of roller sets with different peripheral speed differences to obtain a 5-fold stretched film. Next, after kneading the thermoplastic resin composition c with an extruder set at 250°C, it was supplied to an extrusion die set at 250°C, extruded into a sheet, and laminated on the above-mentioned The surface and back of the film are stretched 5 times to obtain a laminated film with a three-layer structure. Next, the laminated film was cooled to 60°C, heated again to about 145°C in a tenter furnace, stretched 8 times in the transverse direction, annealed in an oven adjusted to 160°C, cooled to 60°C, and trimmed. Meanwhile, a porous resin fil...

manufacture example 2

[0231] After kneading the thermoplastic resin composition b with an extruder set at 230°C, it was supplied to an extrusion die set at 250°C, extruded into a sheet, and cooled by a cooling device to obtain a non- Stretch sheet. This non-stretched sheet was heated to 150° C., and stretched 4 times in the longitudinal direction using a plurality of roller sets with different peripheral speed differences to obtain a 4-fold stretched film. Next, after kneading the thermoplastic resin composition d with an extruder set at 250° C., it was supplied to an extrusion die set at 250° C., extruded into a sheet, and laminated on each of the four prepared above. Double-stretch the front and back of the film to obtain a laminated film with a three-layer structure. Next, the laminated film was cooled to 60°C, heated again to about 150°C in a tenter furnace, stretched 7.5 times in the transverse direction, annealed in an oven adjusted to 160°C, cooled to 60°C, and repaired. Meanwhile, a porou...

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Abstract

Disclosed is an electret film (ii) that can stably maintain a high charge state over a long period of time and is formed by injecting charges into a porous resin film (i) having high dielectric strength. Specifically, the electret film (ii) is characterized in that a porous resin film (i) which comprises a core layer (A) having a biaxially stretched porous resin film and a surface layer (B) having a stretched resin film provided on at least one side of the core layer (A), has a water vapor permeation coefficient of 0.1 to 2.5 gmm / m224 hr, and has a surface resistivity (at least one surface thereof) of 1*1013-9*1017[Omega] is subjected to direct current high-voltage discharge treatment to electretize the film (i). Also disclosed is an electret (iii) comprising the electret film (ii) and anelectroconductive layer.

Description

technical field [0001] The present invention relates to an electretized thin film and an electret containing the same, and more particularly to an electretized thin film in which charge density is kept stable for a long period of time by storing charges inside the thin film, and a material for electric and electronic input / output devices containing the same A variety of electrets with good performance and a conductive layer. Background technique [0002] The so-called electret is a material that maintains a semi-permanent electrical polarization inside and forms an electric field (applies an electric force) to the outside even in the absence of an external electric field. It refers to polymer materials, inorganic materials, etc. that have traditionally been difficult to conduct electricity A material that is subjected to heat treatment or electrical treatment so that a part of the material is semi-permanently polarized, that is, a material that is electrostatically charged, ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01G7/02B32B5/18B32B7/02H04R19/01
Inventor 小池弘饭田诚一郎
Owner YUPO CORP