Highly dielectric film

a dielectric film, high-dielectric technology, applied in the direction of thermoelectric devices, fixed capacitors, transportation and packaging, etc., can solve the problems of difficult film thickness, difficult film formation, lowering of withstand voltage, etc., to achieve excellent winding property, high dielectric property, and thin

Inactive Publication Date: 2009-12-10
DAIKIN IND LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0017]It is an object of the present invention to provide a highly dielectric film which has high dielectric property, can be made thin and is excellent in winding property (flexibility).

Problems solved by technology

Therefore, making a film thinner has been studied, but if a film is made too thin, film formation becomes difficult, and lowering of a withstand voltage is recognized.
However dielectric constants of any of these films are not more than 20, and those polymers are materials making it difficult to make a film thinner.
However in these methods, it is difficult to produce a thin film having a high dielectric constant and few voids.
In the case of using a rigid hydrocarbon polymer, it is possible to produce a thin film having a high mechanical strength but there is a large effect of a dielectric constant of the polymer itself, thereby limiting improvement of a film dielectric constant, and a film becomes hard.
Therefore, it cannot be said that such a film is suitable as a film for a film condenser which is required to have excellent winding property (flexibility).
In the case of using a vinylidene fluoride polymer, it is difficult to obtain a film in which highly dielectric inorganic particles are homogeneously incorporated in a polymer, and further improvement in making a thin film and increasing a dielectric constant is required.
However the film is as thick as 150 μm, and cannot be said to be suitable as a film for a film condenser which is required to have excellent winding property (flexibility).

Method used

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Examples

Experimental program
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example 1

[0102]Into a 3-liter separable flask were poured 900 parts by mass of N-methylpyrrolidone (NMP) (available from Tokyo Chemical Industry Co., Ltd.) and 100 parts by mass of polyvinylidene fluoride (PVdF) polymer (VP832 available from DAIKIN INDUSTRIES, LTD., dielectric constant: 9.8 (1 kHz, 25° C.)), and 4-hour stirring was carried out at 80° C. under nitrogen gas atmosphere with a mechanical stirrer to obtain a polymer solution having a concentration of 10% by mass. This polymer solution was a light-yellow homogeneous solution.

[0103]To this NMP solution of PVdF were added 100 parts by mass of barium titanate (BT-01 available from Sakai Chemical Industry Co., Ltd.) having an average particle size of 0.1 μm and further 10 parts by mass of PLANEACT KR-55 available from AJINOMOTO CO., INC. as a titanium coupling agent.

[0104]To this mixture was added the same mass of glass beads (GB503M available from Potters-Ballotini Co., Ltd.) as that of the mixture, and the obtained mixture was put i...

examples 2 to 10

[0108]Compositions of the present invention were prepared in the same manner as in Example 1 except that amounts of PVdF, barium titanate and a titanium coupling agent were changed as shown in Table 1, and a viscosity and dispersion stability thereof were evaluated. Further dielectric films were formed in the same manner as in Example 1, and a dielectric constant at each frequency, flexibility, surface center roughness and void content of the obtained films were evaluated. The results are shown in Table 1.

TABLE 1Example12345678910Composition (part by mass)Solvent (NMP)900900850800850900900900900900PVdF100100150200150100100100100100Barium titanate100150225300225150150150150150Coupling agent101522.53011.31.515157.51.5Characteristics of compositionDispersion stability◯◯◯◯◯◯◯◯◯◯Viscosity (Pa · s)0.580.581.451.580.590.590.590.590.590.59Characteristics of filmFilm thickness (μm)5.15.24.85.24.95.03.28.46.57.2Dielectric100 Hz37656463646464646361constant 1 kHz35606362626263636159 10 kHz34585...

examples 11 to 24

[0109]Compositions of the present invention were prepared in the same manner as in Example 1 except that various surfactants were added in an amount of 10% by mass based on barium titanate instead of the titanium coupling agent and amounts of PVdF and barium titanate were changed as shown in Table 2, and dispersion stability thereof was evaluated. Further dielectric films were formed in the same manner as in Example 1, and a dielectric constant at each frequency and flexibility of the obtained films were evaluated. The results are shown in Table 2.

[0110]Added surfactants S1 to S13 are as follows.

S1: Nonionic surfactant (poly-oxyethylene-distyrene-phenyl-ether) (EMULGEN A60 available from KAO CORPORATION)

S2: Anionic surfactant (special polycarboxylic acid polymer surfactant) (HOMOGENOL L18 available from KAO CORPORATION)

S3: Cationic surfactant (imidazoline surfactant) (HOMOGENOL L95 available from KAO CORPORATION)

S4: Nonionic surfactant (sorbitan monooleate) (REODOL sp10 available fr...

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Abstract

There is provided a highly dielectric film which has high dielectric property, can be formed into a think film and is excellent in winding property (flexibility). The highly dielectric film comprises (A) a vinylidene fluoride polymer, (B) barium titanate oxide particles and / or lead zirconium titanate oxide particles, and (C) an affinity improving agent, wherein the barium titanate oxide particles and / or lead zirconium titanate oxide particles (B) and the affinity improving agent (C) are contained in amounts of 10 to 500 parts by mass and 0.01 to 30 parts by mass, respectively based on 100 parts by mass of the vinylidene fluoride polymer (A).

Description

TECHNICAL FIELD[0001]The present invention relates to a highly dielectric film being useful, for example, as a dielectric film for a film condenser.BACKGROUND ART[0002]In recently years, plastic insulating materials are expected as film materials for film condensers for communication, electronic devices, electric power, medium and low voltage phase advancement and inverter, piezoelectric devices, pyroelectric devices and dielectric materials for transfer printing carrier since they have a high insulation resistance, excellent frequency characteristics and excellent flexibility.[0003]A film condenser is usually comprised of a film structure comprising a dielectric polymer film subjected to aluminum or zinc deposition on its surface, or a film structure comprising multi-layers of aluminum foils and dielectric polymer films, and recently there are used a lot of condenser films comprising a dielectric polymer film and an electrode formed thereon by metal deposition.[0004]Hydrocarbon pol...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): C08K3/22B05D3/00H01L41/45
CPCC09D127/16H01B3/002H01B3/445H01G4/1227Y10T428/24917H01L37/025H01L41/37H01L41/317Y10T428/31H01G4/1245Y10T428/3154Y10T428/31699H10N15/15H10N30/077H10N30/092
Inventor KOH, MEITENYOKOTANI, KOUJIMATSUMURA, MIHARU
Owner DAIKIN IND LTD
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