US4435475A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Dielectric film
Assignee: Kureha Corp
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Filing: 1981-04-01
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Granted: 1984-03-06
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Expires: 2001-04-01
Abstract
Abstract A film prepared by molding a resin compound of a polyvinylidene fluoride admixed with a polycarbonate and/or a thermoplastic polyester and stretching into at least one direction is disclosed. The film shows excellent dielectric properties.
Inventors
- 👤 Tohru Sasaki
- 👤 Syuuzi Terasaki
- 👤 Hideo Munakata
- 👤 Mitsuru Ohta
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 06:22
CPC Classifications
H; H01; H01G; H01G4/00; H01G4/002; H01G4/018; H01G4/06; H01G4/14; H01G4/18; Y; Y10; Y10T; Y10T428/00; Y10T428/31; Y10T428/31504; Y10T428/31507; Y10T428/3154; Y10T428/31544; Y10T428/31786; Y10T428/31855; Y10T428/31935
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
78 words
A dielectric film having minutely rough surfaces and prepared by (a) molding a resin composition comprising (i) 99.5 to 70 parts by weight of a polyvinylidene fluoride and (ii) 0.5 to 30 parts by weight of a resin selected from the group consisting of a polycarbonate, a thermoplastic polyester, and mixtures thereof into a continuous sheet and (b) stretching the continuous sheet of (a) in at least one direction to give a dielectric film with minutely rough surfaces.
Claim 2
Dependent Claim
78 words
A dielectric film having minutely rough surfaces and prepared by (a) molding a resin composition comprising (i) 99.5 to 70 parts by weight of a polyvinylidene fluoride and (ii) 0.5 to 30 parts by weight of a resin selected from the group consisting of a polycarbonate, a thermoplastic polyester, and mixtures thereof into a continuous sheet and (b) stretching the continuous sheet of (a) in at least one direction to give a dielectric film with minutely rough surfaces.
Claim 3
Dependent Claim
17 words
A dielectric film according to claim 1, wherein said polyvinylidene fluoride is a homopolymer of vinylidene fluoride.
Claim 4
Dependent Claim
22 words
A dielectric film according to claim 1, wherein said polyvinylidene fluoride has an inherent viscosity in a range of 0.6 to 1.8.
Claim 5
Dependent Claim
39 words
A dielectric film according to claim 1, wherein said resin compound is prepared by compounding 1 to 20 parts by weight of said polycarbonate or said thermoplastic polyester into 99 to 80 parts by weight of said polyvinylidene fluoride.
Claim 6
Dependent Claim
25 words
A dielectric film according to claim 1, wherein said thermoplastic polyester is a polymethylene terephthalate, a polyethylene terephthalate, a polybutylene terephthalate or a polyethylene naphthalate.
Claim 7
Dependent Claim
34 words
A dielectric film according to claim 1, wherein said polyvinylidene fluoride is a copolymer of vinylidene fluoride and another monomer copolymerizable with vinylidene fluoride, containing more than 50 mole % of vinylidene fluoride units.
Claim 8
Dependent Claim
27 words
A dielectric film according to claim 6, wherein said monomer copolymerizable with vinylidene fluoride is selected from the group consisting of tetrafluoroethylene, trifluoroethylene, trifluorochloroethylene and vinyl fluoride.
References Cited (Backward Citations)
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Cited
US3991451A
Cited
US4173033A
Cited
US4166876A
Cited
US4297427A
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) | 1987-03-06 | 1987-09-05 | 1988-03-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-03-06 | 1991-09-05 | 1992-03-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-03-06 | 1995-09-05 | 1996-03-06 | $7700.00 | Window Closed / Lapsed |