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US4521322A
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US
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Process for manufacturing a piezo- or pyroelectric polymer material comprising a cross-linking step
Assignee: Thales SA
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Filing: 1983-10-20
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Granted: 1985-06-04
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Expires: 2003-10-20
Abstract
Abstract The invention relates to piezoelectric or pyroelectric polymer materials. It provides a process for manufacturing these materials comprising pressing polymer pellets while heating, dipping the obtained sheets in water, stretching the sheets, electrically polarizing the sheets by applying between the two faces of the sheets an electric orientation field, irradiating the sheets to obtain crosslinking and reheating the sheets.
Inventors
- 👤 Dominique Broussoux
- 👤 Hugues Facoetti
- 👤 Francois Micheron
- 👤 Lucien Monnerie
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 18:47
CPC Classifications
H; H10; H10N; H10N30/00; H10N30/01; H10N30/04; H10N30/045; H10N30/09; H10N30/098; H10N30/80; H10N30/85; H10N30/857; Y; Y10; Y10S; Y10S310/00; Y10S310/80; Y10T; Y10T428/00; Y10T428/31504; Y10T428/3154
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
80 words
A process for manufacturing at least one piezoelectric or pyroelectric element formed from a polymer material capable of acquring piezoelectric or pyroelectric properties comprising pressing polymer pellets to form polymer sheets dipping the polymer sheets in water, stretching the dipped sheets, electrically polarizing said polymer sheets by applying between the two faces of said sheets an electric orientation field, irradiating said polymer sheets to obtain a cross-linking rate close to 0.5, and reheating said polymer sheets to form said element.
Claim 2
Dependent Claim
80 words
A process for manufacturing at least one piezoelectric or pyroelectric element formed from a polymer material capable of acquring piezoelectric or pyroelectric properties comprising pressing polymer pellets to form polymer sheets dipping the polymer sheets in water, stretching the dipped sheets, electrically polarizing said polymer sheets by applying between the two faces of said sheets an electric orientation field, irradiating said polymer sheets to obtain a cross-linking rate close to 0.5, and reheating said polymer sheets to form said element.
Claim 3
Dependent Claim
21 words
The manufacturing process as claimed in claim 1, wherein said stretching step takes place before or during said electric polarizing step.
Claim 4
Dependent Claim
19 words
The manufacturing process as claimed in claim 1, wherein said irradiating step takes place after said electric polarizing step.
Claim 5
Dependent Claim
24 words
The manufacturing process as claimed in claim 2, wherein said irradiating step takes place after said stretching step and before said electric polarizing step.
Claim 6
Dependent Claim
15 words
The manufacturing process as claimed in claim 1, wherein said polymer material is vinylidene polyfluoride.
Claim 7
Dependent Claim
18 words
The manufacturing process as claimed in claim 1, wherein said polymer material is an alloy including vinylidene polyfluoride.
Claim 8
Dependent Claim
15 words
The manufacturing process as claimed in claim 1, wherein said material comprises vinylidene polyfluoride copolymers.
Claim 9
Dependent Claim
19 words
The manufacturing process as claimed in claim 1, wherein said irradiating concerns only a part of said polymer material.
Claim 10
Dependent Claim
16 words
The manufacturing process as claimed in claim 1, wherein said irradiating is achieved by electron irradiation.
Claim 11
Dependent Claim
25 words
The manufacturing process as claimed in claim 1, wherein said irradiating is achieved by electron irradiation of vinylidene polyfluoride at a dose of 40 Mrads.
Claim 12
Dependent Claim
119 words
A process for manufacturing at least one piezoelectric or pyroelectric element formed from a polymer material capable of acquiring piezoelectric or pyroelectric properties comprising: pressing polymer pellets at about 220° C. for about 10 minutes to form polymer sheets, dipping the polymer sheets in water, stretching the dipped sheets to 4 times their initial value at about 75° C., to a thickness of about 170 microns, electrically polarizing said polymer sheets by applying between the two faces of said sheets an electric orientation field on the order of 15 kV, irradiating said polymer sheets to obtain a cross-linking rate close to 0.5, and reheating said polymer sheets to about 80° C. for about 30 minutes to form said element.
Claim 13
Dependent Claim
119 words
A process for manufacturing at least one piezoelectric or pyroelectric element formed from a polymer material capable of acquiring piezoelectric or pyroelectric properties comprising: pressing polymer pellets at about 220° C. for about 10 minutes to form polymer sheets, dipping the polymer sheets in water, stretching the dipped sheets to 4 times their initial value at about 75° C., to a thickness of about 170 microns, electrically polarizing said polymer sheets by applying between the two faces of said sheets an electric orientation field on the order of 15 kV, irradiating said polymer sheets to obtain a cross-linking rate close to 0.5, and reheating said polymer sheets to about 80° C. for about 30 minutes to form said element.
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) | 1988-06-03 | 1988-12-03 | 1989-06-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-06-03 | 1992-12-03 | 1993-06-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-06-03 | 1996-12-03 | 1997-06-04 | $7700.00 | Window Closed / Lapsed |