Patent US5117327A successfully refreshed from Google Patents.
US5117327A
Expired / Lapsed
US
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Norbornene dicarboximide polymer dielectric devices
Assignee: Monsanto Co
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Filing: 1990-12-19
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Granted: 1992-05-26
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Expires: 2010-12-19
Abstract
Abstract Electrical devices, e.g. molded circuit boards, connectors and capacitors, fabricated from electrical insulating component, comprising norbornene dicarboximide thermoplastic polymer exhibiting a glass transition temperature greater than about 200 DEG C., moisture absorption after equilibrating in boiling water of less than about 3 weight percent and an electrical permittivity at 1000 hertz measured at 25 DEG C. and 50 percent relative humidity of less than 2.8. Preferred polymers comprise N-methyl norbornene dicarboximide, N-ethyl norbornene dicarboximide, N-propyl norbornene dicarboximide, N-butyl norbornene dicarboximide, N-trifluoroethyl norbornene dicarboximide, N-phenyl norbornene dicarboximide, N-trifluoromethylphenyl norbornene dicarboximide, N-cyclohexyl norbornene dicarboximide, N-cycloheptyl norbornene dicarboximide, N-cyclooctyl norbornene dicarboximide.
Inventors
- 👤 Jawed Asrar
- 👤 Christopher J. Hardiman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 07:21
CPC Classifications
H; H05; H05K; H05K1/00; H05K1/02; H05K1/03; H05K1/0313; H05K1/032; H05K1/0346; C; C08; C08G; C08G61/00; C08G61/02; C08G61/04; C08G61/06; C08G61/08; H01; H01G; H01G4/00; H01G4/002; H01G4/018; H01G4/06; H01G4/14; H01G4/18; H01R; H01R13/00; H01R13/46; H01R4/00; H01R4/70
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
73 words
A device comprising an electrical conducting component and an electrical insulating component, wherein said electrical insulating component comprises a thermoplastic polymer exhibiting a glass transition temperature greater than about 200° C., moisture absorption after equilibrating in boiling water of less than about 3 weight percent and an electrical permittivity at 1000 hertz measured at 25° C. and 50 percent relative humidity of less than 2.8, wherein said polymer comprises units of norbornene dicarboximide.
Claim 2
Independent Claim
73 words
A device comprising an electrical conducting component and an electrical insulating component, wherein said electrical insulating component comprises a thermoplastic polymer exhibiting a glass transition temperature greater than about 200° C., moisture absorption after equilibrating in boiling water of less than about 3 weight percent and an electrical permittivity at 1000 hertz measured at 25° C. and 50 percent relative humidity of less than 2.8, wherein said polymer comprises units of norbornene dicarboximide.
Claim 3
Dependent Claim
16 words
A device according to claim 1 comprising a molded circuit board, a connector or a capacitor.
Claim 4
Dependent Claim
25 words
A device according to claim 1 wherein said norbornene dicarboximide units comprise N-cycloalkyl norbornene dicarboximide units wherein said cycloalkyl units range from cyclopropyl to cyclooctyl.
Claim 5
Dependent Claim
56 words
A device according to claim 1 wherein said polymer is a saturated or unsaturated homopolymer or copolymer comprising units selected from the group consisting of N-methyl norbornene dicarboximide, N-ethyl norbornene dicarboximide, N-propyl norbornene dicarboximide, N-butyl norbornene dicarboximide, N-trifluoroethyl norbornene dicarboximide, N-phenyl norbornene dicarboximide, N-trifluoromethylphenyl norbornene dicarboximide, N-cyclohexyl norbornene dicarboximide, N-cycloheptyl norbornene dicarboximide, and N-cyclooctyl norbornene dicarboximide.
Claim 6
Dependent Claim
35 words
A device according to claim 1 wherein said polymer exhibits electrical permittivity of less than 2.8 when measured at 25° C. and 50 percent relative humidity over a frequency range of 10 to 100,000 hertz.
Claim 7
Dependent Claim
21 words
A device according to claim 1 wherein said thermoplastic polymer is prepared by metathesis ring-opening polymerization of norbornene dicarboximide monomer units.
Claim 8
Dependent Claim
62 words
A device according to claim 6 wherein said polymer is a saturated or unsaturated homopolymer or copolymer prepared by metathesis ring-opening polymerization of monomer units selected from the group consisting of N-methyl norbornene dicarboximide, N-ethyl norbornene dicarboximide, N-propyl norbornene dicarboximide, N-butyl norbornene dicarboximide, N-trifluoroethyl norbornene dicarboximide, N-phenyl norbornene dicarboximide, N-trifluoromethylphenyl norbornene dicarboximide, N-cyclohexyl norbornene dicarboximide, N-cycloheptyl norbornene dicarboximide, and N-cyclooctyl norbornene dicarboximide.
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) | 1995-05-26 | 1995-11-25 | 1996-05-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1999-05-26 | 1999-11-25 | 2000-05-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2003-05-26 | 2003-11-25 | 2004-05-26 | $7700.00 | Window Closed / Lapsed |