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US 4,708,989 AGranted
Polymer based dielectric material with high dielectric permittivity
AssigneeThomson-CSF
InventorsDominique Broussoux, Francois Micheron
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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.
Claims11
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.
3 more elements
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:
- 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.
3 more elements
Dependencies are inferred from the claim text.