US4622355A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Radiation-hardened polymeric films
Assignee: United States, ENERGY THE, Secretary of, Department of
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Filing: 1984-07-16
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Granted: 1986-11-11
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Expires: 2004-07-16
Abstract
Abstract The radiation-induced conductivity of polymeric dielectrics with low electronic mobility is reduced by doping with electron donor or electron acceptor compounds at a level of 1015 to 1021 molecules of dopant/cm3. Polyesters, polyolefins, perfluoropolyolefins, vinyl polymers, vinylidene polymers, polycarbonates, polysulfones and polyimides can benefit from such a treatment. Usable dopants include 2,4,7-trinitro-9-fluorenone, tetracyanethylene, 7,7,8,8-tetracyanoquinodimethane, m-dinitrobenzene, 2-isopropylcarbazole, and triphenylamine.
Inventors
- 👤 Charles Arnold, Jr.
- 👤 Robert C. Hughes
- 👤 R. Glen Kepler
- 👤 Steven R. Kurtz
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 20:50
CPC Classifications
C; C08; C08J; C08J7/00; C08J7/04; C08J7/06; C08J7/065; H; H01; H01B; H01B1/00; H01B1/06; H01B1/12
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
54 words
Polymeric dielectric compositions with reduced radiation-induced conductivity, containing from about 10 15 to 10 21 molecules/cm 3 of a compatible organic Lewis acid or Lewis base as dopant, said dielectric being a low electronic mobility polymer selected from the group consisting of polyesters, polyolefins, perfluorinated polyolefins, vinyl polymers, vinylidene polymers, polycarbonates, polysulfones, and polyimides.
Claim 2
Dependent Claim
54 words
Polymeric dielectric compositions with reduced radiation-induced conductivity, containing from about 10 15 to 10 21 molecules/cm 3 of a compatible organic Lewis acid or Lewis base as dopant, said dielectric being a low electronic mobility polymer selected from the group consisting of polyesters, polyolefins, perfluorinated polyolefins, vinyl polymers, vinylidene polymers, polycarbonates, polysulfones, and polyimides.
Claim 3
Dependent Claim
12 words
The composition of claim 1 wherein the polymer is a polyethylene terephthalate.
Claim 4
Dependent Claim
12 words
The composition of claim 1 wherein the dopant is a Lewis acid.
Claim 5
Dependent Claim
11 words
The composition of claim 3 wherein the Lewis acid is 2,4,7-trinitro-9-fluorenone.
Claim 6
Dependent Claim
11 words
The composition of claim 3 wherein the Lewis acid is tetracyanoethylene.
Claim 7
Dependent Claim
11 words
The composition of claim 3 wherein the Lewis acid is 7,7,8,8-tetracyanoquinodimethane.
Claim 8
Dependent Claim
11 words
The composition of claim 3 wherein the Lewis acid is m-dinitrobenzene.
Claim 9
Dependent Claim
25 words
The composition of claim 4 wherein the concentration of the dopant is within the range of about 10 18 to 10 19 molecules/cm 3 .
Claim 10
Dependent Claim
12 words
The composition of claim 1 wherein the dopant is 2-isopropylcarbazole or triphenylamine.
Claim 11
Dependent Claim
37 words
A process for the reduction of radiation-induced conductivity in a polymeric dielectric, comprising immersing the dielectric in a solution of an electron donor or an electron acceptor dopant, washing the resulting swollen dielectric, and removing the solvent.
Claim 12
Dependent Claim
37 words
A process for the reduction of radiation-induced conductivity in a polymeric dielectric, comprising immersing the dielectric in a solution of an electron donor or an electron acceptor dopant, washing the resulting swollen dielectric, and removing the solvent.
Claim 13
Dependent Claim
26 words
The process of claim 10 wherein the dopant solution has a concentration approximately similar to the concentration of dopant desired in the reduced radiation-induced conductivity dielectric.
Claim 14
Dependent Claim
21 words
The process of claim 11 wherein the dopant solution consists of a Lewis acid dissolved in benzyl alcohol or ethylene glycol.
Claim 15
Dependent Claim
10 words
The process of claim 11 wherein the dopant is 2,4,7-trinitro-9-fluorenone.
Claim 16
Dependent Claim
85 words
The process of claim 10 wherein the dielectric is a polyethylene terephthalate film with a thickness between about 1 and 1000 microns, and wherein: (a) the immersion is carried out for 2 to 10 seconds at about 140° to 160° C. in an about 0.005 g/cm 3 solution of 2,4,7-trinitro-9-fluorenone in ethylene glycol, and (b) the removal of the solvent is effected at about 50° to 2000° C. for a period of about 1 to 3 minutes at a pressure about 1 to 760 torrs.
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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) | 1989-11-10 | 1990-05-12 | 1990-11-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-11-10 | 1994-05-12 | 1994-11-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-11-10 | 1998-05-12 | 1998-11-11 | $7700.00 | Window Closed / Lapsed |