High dielectric film

A dielectric and electrode technology, applied in the field of high dielectric films, can solve the problems of low driving voltage, easy generation of pinholes, low relative dielectric constant, etc., and achieve the effect of low dielectric loss and high relative dielectric constant.

Inactive Publication Date: 2015-06-10
DAIKIN IND LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0018] However, when the film thickness is reduced, pinholes are likely to occur, thereby causing a problem that dielectric breakdown is likely to occur
In addition, conventionally, there have been examples of using a hydrophobic film made of a fluorine material as a hydrophobic film, but such a hydrophobic film has a low relative permittivity (5 or less).
[0019] In order to solve this problem, for example, Patent Document 1 proposes that only the surface of the metal constituting the electrode is anodized to form a dielectric film, thereby suppressing the occurrence of pinholes and making the dielectric film thinner. As a result, the driving voltage is reduced; however, it is desirable to provide technology that can drive conductive liquids at lower voltages

Method used

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Examples

Experimental program
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Effect test

Synthetic example 1

[0308] Synthesis example 1 (production of VdF / TFE copolymer (a1))

[0309] 1.3 kg of pure water was charged into an autoclave with an inner volume of 4 L, and after nitrogen substitution was sufficiently performed, 1.3 g of octafluorocyclobutane was charged, and the temperature in the system was maintained at 37° C. at a stirring speed of 580 rpm. Thereafter, 200 g of a mixed gas of tetrafluoroethylene (TFE) / 1,1-difluoroethylene (vinylidene fluoride, VdF) = 7 / 93 mol %, 1 g of ethyl acetate, and then di-n-propylene peroxydicarbonate were added. 1 g of a 50% by mass methanol solution of the ester was used to initiate polymerization. Since the pressure in the system decreased as the polymerization proceeded, a mixed gas of tetrafluoroethylene / 1,1-difluoroethylene=7 / 93 mol % was continuously supplied to maintain the pressure in the system at 1.3 MPaG. Stirring was continued for 20 hours. Next, the pressure was released, and after returning to atmospheric pressure, the reaction p...

Synthetic example 2

[0310] Synthesis example 2 (production of VdF / TFE copolymer (a2))

[0311] 1.3 kg of pure water was charged into an autoclave with an inner volume of 4 L, and after nitrogen substitution was sufficiently performed, 1.3 g of octafluorocyclobutane was charged, and the inside of the system was kept at 37° C. at a stirring speed of 580 rpm. Thereafter, 200 g of a mixed gas of tetrafluoroethylene (TFE) / 1,1-difluoroethylene (vinylidene fluoride, VdF) = 20 / 80 mol %, 1 g of ethyl acetate, and then di-n-propylene peroxydicarbonate were added. 1 g of a 50% by mass methanol solution of the ester was used to initiate polymerization. Since the pressure in the system decreased as the polymerization proceeded, a mixed gas of tetrafluoroethylene / 1,1-difluoroethylene=20 / 80 mol % was continuously supplied to maintain the pressure in the system at 1.3 MPaG. Stirring was continued for 20 hours. Next, the pressure was released, and after returning to atmospheric pressure, the reaction product was ...

Synthetic example 3

[0312] Synthesis example 3 (production of VdF / TFE copolymer (a3))

[0313] 1.3 kg of pure water was put into an autoclave with a phase inner volume of 4 L, and after nitrogen replacement was fully carried out, 1.3 g of octafluorocyclobutane was put in, and the temperature in the system was maintained at 37° C. and the stirring speed was 580 rpm. Thereafter, 200 g of a mixed gas of tetrafluoroethylene (TFE) / 1,1-difluoroethylene (vinylidene fluoride, VdF) = 18 / 82 mol %, 1 g of ethyl acetate, and then di-n-propyl peroxydicarbonate were added. 1 g of a 50% by mass methanol solution of the ester was used to initiate polymerization. Since the pressure in the system decreased as the polymerization proceeded, a mixed gas of tetrafluoroethylene / 1,1-difluoroethylene=18 / 82 mol % was continuously supplied to maintain the pressure in the system at 1.3 MPaG. Stirring was continued for 20 hours. Next, the pressure was released, and after returning to atmospheric pressure, the reaction prod...

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Abstract

The purpose of the present invention is to provide a film which has a high relative dielectric constant and a low dielectric loss tangent. The present invention is a high dielectric film which is characterized by being formed of a vinylidene fluoride / tetrafluoroethylene copolymer (A) that has a vinylidene fluoride / tetrafluoroethylene molar ratio of from 95 / 5 to 80 / 20. This high dielectric film is also characterized by being configured from an α-type crystal structure and a β-type crystal structure, with the β-type crystal structure occupying 50% or more.

Description

【Technical field】 [0001] This invention relates to high dielectric films. 【Background technique】 [0002] Regarding the high dielectric film, since it has a high relative permittivity, it has been proposed to use the high dielectric film as a film for electrowetting or the like. [0003] Electrowetting refers to changing the wettability (wettability) of the surface of a hydrophobic dielectric film between hydrophobicity (hydrophobicity) and hydrophilicity using an electric field. Using this electrowetting, it is possible to drive the conductive liquid arranged on the above-mentioned surface. This mechanism is capable of driving conductive liquid without a mechanical movable part, which is advantageous for downsizing and prolonging the life of the device. Therefore, proposals have been made to apply electrowetting devices especially for various applications, such as optical elements in display devices, liquid lenses capable of arbitrarily changing the focal length, and tran...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L27/16C08J5/18C08K3/20G02B3/14G02B26/00G02B26/02G02F1/19H01G4/18
CPCC08J5/18C08K3/22G02B26/005G02B26/02C08J2327/16C08K2003/2227C08K2201/003C08L2203/16C08L27/16C08J2327/18G02B3/14H01G4/18H01G4/1209H01G4/206C08K3/36C08K2003/2206C08K2003/222C08K2003/2237
Inventor 立道麻有子太田美晴横谷幸治小松信之仲村尚子茂内普巳子硲武史木下雅量高明天石川卓司井口贵视内田一畅深谷伦行北原隆宏小谷哲浩
Owner DAIKIN IND LTD
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