US4543294A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Polymer dielectric comprising copolymer of vinylidene fluoride, tetrafluoroethylene and ethylene
Assignee: Kureha Corp
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Filing: 1984-05-31
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Granted: 1985-09-24
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Expires: 2004-05-31
Abstract
Abstract A copolymer of 20 to 33 mol. % vinylidene fluoride, 15 to 45 mol. % of ethylene and 30 to 65 mol. % of tetrafluoroethylene gives a dielectric material having a large dielectric constant of 4.0 or above and a small dielectric dissipation factor (tan δ) of 0.8% or below, and is suitable for use as a condenser film.
Inventors
- 👤 Teruo Sakagami
- 👤 Noriyuki Arakawa
- 👤 Haruko Kakutani
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 10:28
CPC Classifications
H; H01; H01B; H01B3/00; H01B3/18; H01B3/30; H01B3/44; H01B3/443; H01B3/445; H01G; H01G4/00; H01G4/002; H01G4/018; H01G4/06; H01G4/14; H01G4/18; H01G4/186; Y; Y10; Y10T; Y10T428/00; Y10T428/26; Y10T428/261; Y10T428/31504; Y10T428/3154; Y10T428/31544
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
81 words
A polymer dielectric comprising a copolymer of 20 to 33 mol. % of vinylidene fluoride, 15 to 45 mol. % of ethylene and 30 to 65 mol. % of tetrafluoroethylene, and having a dielectric constant of 4.0 or above and a dielectric dissipation factor of 0.8% or below at 20° C. and 1 KHz, said copolymer having been obtained through suspension polymerization in water, or bulk polymerization, and having a sufficiently large degree of polymerization to provide said dielectric dissipation factor.
Claim 2
Dependent Claim
81 words
A polymer dielectric comprising a copolymer of 20 to 33 mol. % of vinylidene fluoride, 15 to 45 mol. % of ethylene and 30 to 65 mol. % of tetrafluoroethylene, and having a dielectric constant of 4.0 or above and a dielectric dissipation factor of 0.8% or below at 20° C. and 1 KHz, said copolymer having been obtained through suspension polymerization in water, or bulk polymerization, and having a sufficiently large degree of polymerization to provide said dielectric dissipation factor.
Claim 3
Dependent Claim
94 words
A dielectric film laminate comprising a plurality of dielectric films stacked in layers, each dielectric film comprising a copolymer of 20 to 33 mol. % of vinylidene fluoride, 15 to 45 mol. % of ethylene and 30 to 65 mol. % of tetrafluoroethylene, and having a dielectric constant of 4.0 or above and a dielectric dissipation factor of 0.8% or below at 20° C. and 1 KHz, said copolymer having been obtained through suspension polymerization in water, or bulk polymerization, and having a sufficiently large degree of polymerization to provide said dielectric dissipation factor.
Claim 4
Dependent Claim
94 words
A dielectric film laminate comprising a plurality of dielectric films stacked in layers, each dielectric film comprising a copolymer of 20 to 33 mol. % of vinylidene fluoride, 15 to 45 mol. % of ethylene and 30 to 65 mol. % of tetrafluoroethylene, and having a dielectric constant of 4.0 or above and a dielectric dissipation factor of 0.8% or below at 20° C. and 1 KHz, said copolymer having been obtained through suspension polymerization in water, or bulk polymerization, and having a sufficiently large degree of polymerization to provide said dielectric dissipation factor.
Claim 5
Dependent Claim
19 words
A polymer dielectric as claimed in claim 1, wherein said copolymer has been obtained through suspension polymerization in water.
Claim 6
Dependent Claim
17 words
A polymer dielectric as claimed in claim 1, wherein said copolymer has been obtained through bulk polymerization.
Claim 7
Dependent Claim
24 words
A polymer dielectric as claimed in claim 1, which is in the form of a film having a thickness of 1 to 200 microns.
Claim 8
Dependent Claim
25 words
A polymer dielectric as claimed in claim 5, which is in the form of a stretched film having a thickness of 1 to 100 microns.
Claim 9
Dependent Claim
20 words
A dielectric film laminate as claimed in claim 2, wherein each film has a thickness of 1 to 50 microns.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1988-09-23 | 1989-03-25 | 1989-09-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-09-23 | 1993-03-25 | 1993-09-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-09-23 | 1997-03-25 | 1997-09-24 | $7700.00 | Window Closed / Lapsed |