US4469747A
Expired / Lapsed
US
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Dielectric films and process for preparing same
Assignee: Kureha Corp
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Filing: 1982-02-10
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Granted: 1984-09-04
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Expires: 2002-02-10
Abstract
Abstract The dielectric film contains from 40 to 97% by volume of a thermoplastic resin, from 2 to 50% by volume of a ceramic dielectric and from 1 to 25% by volume of carbon black. The composite film contain a base film layer composed of said dielectric film and the dielectric film of the thermoplastic resin provided on at least one surface thereof.
Inventors
- 👤 Tohru Sasaki
- 👤 Syuuzi Terasaki
- 👤 Tomoo Susa
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 07:01
CPC Classifications
H; H01; H01G; H01G4/00; H01G4/002; H01G4/018; H01G4/20; H01B; H01B3/00; H01B3/18; H01B3/30; H01B3/40; Y; Y10; Y10S; Y10S428/00; Y10S428/91; Y10T; Y10T428/00; Y10T428/25; Y10T428/252; Y10T428/26; Y10T428/263; Y10T428/30; Y10T428/31504; Y10T428/31507; Y10T428/3154; Y10T428/31551; Y10T428/31645; Y10T428/31725; Y10T428/31736; Y10T428/3175; Y10T428/31757; Y10T428/31765; Y10T428/31786; Y10T428/31797; Y10T428/31855; Y10T428/31909; Y10T428/31913; Y10T428/3192
Claims Analysis
Total Claims: 33
Claim 1
Independent Claim
37 words
A dielectric film comprising from about 40 to 97% by volume of a thermoplastic resin, from about 2 to 50% by volume of a ceramic dielectric and from about 1 to 25% by volume of carbon black.
Claim 2
Dependent Claim
37 words
A dielectric film comprising from about 40 to 97% by volume of a thermoplastic resin, from about 2 to 50% by volume of a ceramic dielectric and from about 1 to 25% by volume of carbon black.
Claim 3
Dependent Claim
24 words
The dielectric film in accordance with claim 1 wherein the thermoplastic resin is in the amount ranging from about 45 to 95% by volume.
Claim 4
Dependent Claim
23 words
The dielectric film in accordance with claim 2 wherein the thermoplastic resin is in the amount ranging from 50 to 93% by volume.
Claim 5
Dependent Claim
27 words
The dielectric film in accordance with any one of claims 1 to 3 wherein the thermoplastic resin is a non-polar thermoplastic resin or a polar thermoplastic resin.
Claim 6
Dependent Claim
17 words
The dielectric film in accordance with claim 4 wherein the non-polar thermoplastic resin is polyethylene or polypropylene.
Claim 7
Dependent Claim
40 words
The dielectric film in accordance with claim 4 wherein the polar thermoplastic resin is a polyvinylidene fluoride homopolymer or a polyvinylidene fluoride copolymer obtainable by the copolymerization of more than about 50 mol% of vinylidene fluoride with a fluorine-containing compound.
Claim 8
Dependent Claim
28 words
The dielectric film in accordance with claim 6 wherein the polar thermoplastic resin is one having a relative dielectric constant at 1 KHz is larger than about 6.
Claim 9
Dependent Claim
21 words
The dielectric film in accordance with claim 7 wherein the relative dielectric constant at 1 KHz is larger than about 8.
Claim 10
Dependent Claim
22 words
The dielectric film in accordance with claim 1 wherein the ceramic dielectric is in the range from 5 to 45% by volume.
Claim 11
Dependent Claim
22 words
The dielectric film in accordance with claim 9 wherein the ceramic dielectric is in the range from 10 to 40% by volume.
Claim 12
Dependent Claim
26 words
The dielectric film in accordance with any one of claims 1, 9 and 10 wherein the ceramic dielectric is a ferroelectric or a ceramic paraelectric material.
Claim 13
Dependent Claim
30 words
The dielectric film in accordance with claim 11 wherein the ferroelectric is a ceramic of the BaTiO 3 type, of the lead titanozirconate type or of the niobic acid type.
Claim 14
Dependent Claim
15 words
The dielectric film in accordance with claim 12 wherein the paraelectric is BaTiO 3 .
Claim 15
Dependent Claim
14 words
The dielectric film in accordance with claim 11 wherein the ceramic is titanium oxide.
Claim 16
Dependent Claim
21 words
The dielectric film in accordance with claim 1 wherein carbon black is in the range from 2 to 20% by volume.
Claim 17
Dependent Claim
23 words
The dielectric film in accordance with claim 15 wherein carbon black is in the amount ranging from about 3 to 15% by weight.
Claim 18
Dependent Claim
74 words
A composite film comprising a base film comprising from about 40 to 97% by volume of a thermoplastic resin, from about 2 to 50% by volume of a ceramic dielectric and from about 1 to 25% by volume of carbon black and a dielectric layer comprising a thermoplastic resin having a volume resistivity lower than that of the base film, said dielectric layer being disposed on at least one surface of said base film.
Claim 19
Dependent Claim
74 words
A composite film comprising a base film comprising from about 40 to 97% by volume of a thermoplastic resin, from about 2 to 50% by volume of a ceramic dielectric and from about 1 to 25% by volume of carbon black and a dielectric layer comprising a thermoplastic resin having a volume resistivity lower than that of the base film, said dielectric layer being disposed on at least one surface of said base film.
Claim 20
Dependent Claim
18 words
The composite film in accordance with claim 17 wherein the composite film is laminated by means of coextrusion.
Claim 21
Dependent Claim
25 words
The composite film in accordance with claim 17 wherein the laminated composite film is prepared by means of coextrusion and subjected to stretching or drafting.
Claim 22
Dependent Claim
32 words
The composite film in accordance with any one of claims 17 or 19 wherein the base film is provided with a linear portion of the thermoplastic resin that contains no carbon black.
Claim 23
Dependent Claim
24 words
The composite film in accordance with claim 17 wherein the base film is laminated with the dielectric layer without interposition of an adhesive layer.
Claim 24
Dependent Claim
21 words
The composite film in accordance with claim 17 wherein a relative dielectric constant of said dielectric layer is higher than 10.
Claim 25
Dependent Claim
20 words
The composite film in accordance with claim 17 wherein a thickness of said dielectric layer is less than 5 microns.
Claim 26
Dependent Claim
20 words
The composite film in accordance with claim 23 wherein the thickness of said dielectric layer is less than 3 microns.
Claim 27
Dependent Claim
26 words
The composite film in accordance with claim 23 wherein the thickness of said dielectric layer is less than 2 times the thickness of said base film.
Claim 28
Dependent Claim
27 words
The composite film in accordance with claim 25 wherein the thickness of said dielectric layer is equal to or thinner than the thickness of said base film.
Claim 29
Dependent Claim
29 words
The composite film in accordance with claim 25 wherein the thickness of said dielectric layer is from 1/2 to 1/50 with respect to the thickness of said base film.
Claim 30
Dependent Claim
24 words
The composite film in accordance with claim 17 wherein the thermoplastic resin constituting said dielectric layer and said base film is a polyvinylidene fluoride.
Claim 31
Dependent Claim
23 words
The composite film in accordance with claim 17 wherein said dielectric layer comprises the thermoplastic resin in which the ceramic dielectric is dispersed.
Claim 32
Dependent Claim
40 words
A process for preparing a composite film which comprises the steps of coextruding a base film and a dielectric layer with one disposed on the other into a sheet and drawing the resulting film in a uniaxial or biaxial direction.
Claim 33
Dependent Claim
40 words
A process for preparing a composite film which comprises the steps of coextruding a base film and a dielectric layer with one disposed on the other into a sheet and drawing the resulting film in a uniaxial or biaxial direction.
References Cited (Backward Citations)
US3865626A
Cited
US3551197A
Cited
US4303720A
Cited
JPS552044A
Cited
US4298719A
Cited
US4241128A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1987-09-04 | 1988-03-05 | 1988-09-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-09-04 | 1992-03-05 | 1992-09-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-09-04 | 1996-03-05 | 1996-09-04 | $7700.00 | Window Closed / Lapsed |