Patent US4708989A successfully refreshed from Google Patents.
US4708989A
Expired / Lapsed
US
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Polymer based dielectric material with high dielectric permittivity
Assignee: Thales SA
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Filing: 1986-06-18
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Granted: 1987-11-24
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Expires: 2006-06-18
Abstract
Abstract The invention relates to dielectric materials formed from polymers and having high dielectric permittivity. The invention provides alloys of ferroelectric polymers with different Curie temperatures, these alloys optimizing the dielectric properties over an extensive temperature and frequency range.
Inventors
- 👤 Dominique Broussoux
- 👤 Francois Micheron
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 12:39
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
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
91 words
A polymer based dielectric material having a high dielectric constant, comprising: an alloy of at least two ferroelectric polymers each having a different Curie temperature, said alloy being composed of the following combinations of polymers: 1. a homopolymer of vinylidene fluoride and at least one copolymer of vinylidene fluoride and trifluoroethylene; 2. at least two copolymers of vinylidene fluoride and trifluoroethylene; 3. at least two terpolymers, each comprising vinylidene fluoride and trifluoroethylene monomers and another fluorinated unsaturated monomer; or 4. a copolymer of (2) above and a terpolymer of (3) above.
Claim 2
Dependent Claim
91 words
A polymer based dielectric material having a high dielectric constant, comprising: an alloy of at least two ferroelectric polymers each having a different Curie temperature, said alloy being composed of the following combinations of polymers: 1. a homopolymer of vinylidene fluoride and at least one copolymer of vinylidene fluoride and trifluoroethylene; 2. at least two copolymers of vinylidene fluoride and trifluoroethylene; 3. at least two terpolymers, each comprising vinylidene fluoride and trifluoroethylene monomers and another fluorinated unsaturated monomer; or 4. a copolymer of (2) above and a terpolymer of (3) above.
Claim 3
Dependent Claim
47 words
The dielectric material as claimed in claim 1, wherein the alloy is formed of 50% by weight of a copolymer comprising 60 mole % vinylidene fluoride and 40 mole % trifluoroethylene, and 50% of a copolymer comprising 70 mole % vinylidene fluoride and 30 mole % trifluoroethylene.
Claim 4
Dependent Claim
47 words
The dielectric material as claimed in claim 1, wherein the alloy is formed of 30% by weight of a copolymer comprising 60 mole % vinylidene fluoride and 40 mole % trifluoroethylene, and 70% of a copolymer comprising 50 mole % vinylidene fluoride and 50 mole % trifluoroethylene.
Claim 5
Dependent Claim
65 words
The dielectric material as claimed in claim 1, wherein said alloy is formed by a third by weight of a copolymer comprising 50 mole % vinylidene fluoride and 50 mole % trifluoroethylene, a third of a copolymer comprising 60 mole % vinylidene fluoride and 40 mole % trifluoroethylene, and a third of a copolymer comprising 70 mole % vinylidene fluoride and 30 mole % trifluoroethylene.
Claim 6
Dependent Claim
64 words
The dielectric material as claimed in claim 1, wherein said alloy is formed of 45% by weight of a copolymer comprising 50 mole % vinylidene fluoride and 50 mole % trifluoroethylene, of 35% of a copolymer comprising 60 mole % vinylidene fluoride and 40 mole % trifluoroethylene and of 20% of a copolymer comprising 70 mole % vinylidene fluoride and 30 mole % trifluoroethylene.
Claim 7
Dependent Claim
38 words
The dielectric material as claimed in claim 1, wherein said alloy is formed of 40% by weight of vinylidene fluoride homopolymer and 60% of a copolymer comprising 60 mole % vinylidene fluoride and 40 mole % of trifluoroethylene.
Claim 8
Dependent Claim
37 words
The dielectric material as claimed in claim 1, wherein said alloy is formed of 60% by weight of vinylidene fluoride homopolymer and 40% of a copolymer comprising 70 mole % vinylidene fluoride and 30 mole % trifluoroethylene.
Claim 9
Dependent Claim
55 words
The dielectric material as claimed in claim 1, wherein said alloy is formed of 30% by weight of a terpolymer comprising 35 mole % trifluoroethylene, 60 mole % vinylidene fluoride and 5 mole % hexafluoropropene and 70% of a terpolymer comprising 35 mole % trifluoroethylene, 55 mole % vinylidene fluoride and 10 mole % trifluorochloroethylene.
Claim 10
Dependent Claim
57 words
The dielectric material as claimed in claim 1, wherein said alloy is formed of 30% by weight of a terpolymer comprising 35 mole % trifluoroethylene, 60 mole % vinylidene fluoride and 5 mole % hexafluoroethylene, and 70 mole % of a terpolymer comprising 35 mole % trifluoroethylene, 60 mole % vinylidene fluoride and 5 mole % trifluorochloroethylene.
Claim 11
Dependent Claim
51 words
The dielectric material as claimed in claim 1, wherein said alloy is formed of 70% by weight of a terpolymer comprising 35 mole % trifluoroethylene, 55 mole % vinylidene fluoride and 10 mole % trifluorochloroethylene and 30% of a copolymer comprising 60 mole % vinylidene fluoride and 40 mole % trifluoroethylene.
Claim 12
Independent Claim
40 words
A method of preparing a dielectric film comprising: forming a film of a dielectric material from an alloy of at least two ferroelectric polymers each having a different Curie temperature, said alloy being composed of the following combinations of polymers:
Claim 13
Independent Claim
40 words
A method of preparing a dielectric film comprising: forming a film of a dielectric material from an alloy of at least two ferroelectric polymers each having a different Curie temperature, said alloy being composed of the following combinations of polymers:
Claim 14
Dependent Claim
55 words
a homopolymer of vinylidene fluoride and at least one copolymer of vinylidene fluoride and trifluoroethylene; 2. at least two copolymers of vinylidene fluoride and trifluoroethylene; 3. at least two terpolymers, each comprising vinylidene fluoride and trifluoroethylene monomers and another fluorinated unsaturated monomer; or 4. a copolymer of (2) above and a terpolymer of (3) above.
Claim 15
Dependent Claim
55 words
a homopolymer of vinylidene fluoride and at least one copolymer of vinylidene fluoride and trifluoroethylene; 2. at least two copolymers of vinylidene fluoride and trifluoroethylene; 3. at least two terpolymers, each comprising vinylidene fluoride and trifluoroethylene monomers and another fluorinated unsaturated monomer; or 4. a copolymer of (2) above and a terpolymer of (3) above.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1990-11-23 | 1991-05-25 | 1991-11-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-11-23 | 1995-05-25 | 1995-11-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-11-23 | 1999-05-25 | 1999-11-24 | $7700.00 | Window Closed / Lapsed |