US5098771A
Expired / Lapsed
US
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Conductive coatings and inks
Assignee: Hyperion Catalysis International Inc
•
Filing: 1989-07-27
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Granted: 1992-03-24
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Expires: 2009-07-27
Abstract
Abstract An electrically conductive composite in a form suitable for applying to the surface of a substrate that includes a polymeric binder into which carbon fibrils are incorporated.
Inventors
- 👤 Stephen O. Friend
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 15:51
CPC Classifications
B; B29; B29C; B29C67/00; B29C67/24; B29C67/246; B29C70/00; B29C70/04; B29C70/06; B29C70/08; B29C70/081; B29C70/58; B29C70/88; B29C70/882; F; F16; F16D; F16D69/00; F16D69/02; F16D69/025; F16D69/026; B29K; B29K2307/00; B29K2995/00; B29K2995/0003; B29K2995/0005; Y; Y10; Y10S; Y10S428/00; Y10S428/901; Y10T; Y10T428/00; Y10T428/24; Y10T428/24802; Y10T428/24917; Y10T428/25; Y10T428/30
Claims Analysis
Total Claims: 38
Claim 1
Independent Claim
37 words
An electrically conductive composite in a form suitable for applying to the surface of a substrate, said composite comprising a polymeric binder into which carbon fibrils in an amount not greater than 30% by weight are incorporated.
Claim 2
Dependent Claim
37 words
An electrically conductive composite in a form suitable for applying to the surface of a substrate, said composite comprising a polymeric binder into which carbon fibrils in an amount not greater than 30% by weight are incorporated.
Claim 3
Dependent Claim
34 words
The composite of claim 1 wherein said composite is in the form of a powder coating, the molecular weight of said binder being sufficiently high such that it is a solid at room temperature.
Claim 4
Dependent Claim
34 words
The composite of claim 1 wherein said composite is in the form of a liquid coating, the molecular weight of said binder being sufficiently low such that it is a liquid at room temperature.
Claim 5
Dependent Claim
28 words
The coating of claim 2 or 3 wherein the amount of said fibrils permits a substrate to which said coating has been applied to be electrostatically overcoated directly.
Claim 6
Dependent Claim
22 words
The coating of claim 2 or 3 wherein the amount of said fibrils is less than or equal to 15% by weight.
Claim 7
Dependent Claim
18 words
The coating of claim 5 wherein the amount of said fibrils is between 0.5 and 10% by weight.
Claim 8
Dependent Claim
18 words
The coating of claim 6 wherein the amount of said fibrils is between 1 and 4% by weight.
Claim 9
Dependent Claim
36 words
The coating of claim 2 or 3 wherein the amount of said fibrils is between 1 and 4% by weight and permits a substrate to which said coating has been applied to be electrostatically overcoated directly.
Claim 10
Dependent Claim
31 words
The composite of claim 1 wherein said composite is in the form of a resistive ink suitable for screen printing on the surface of a substrate to form an electronic component.
Claim 11
Dependent Claim
18 words
The resistive ink of claim 9 wherein said resistivity is between 10 -1 and 10 4 ohm cm.
Claim 12
Dependent Claim
19 words
The resistive ink of claim 9 wherein the amount of said fibrils is between 1 and 30% by weight.
Claim 13
Dependent Claim
46 words
The resistive ink of claim 9 wherein the amount of said fibrils is between 1 and 30% by weight and is sufficient to decrease the bulk resistivity of said binder to a value between 10 -2 and 10 6 ohm cm when applied to a substrate.
Claim 14
Dependent Claim
56 words
The composite of claim 1 wherein said composite further comprises electrically conductive graphite or metal particles and is in the form of a conductive ink suitable for printing on the surface of a substrate, the amount of said fibrils decreasing the bulk resistivity of the particle-filled binder by a predetermined amount when applied to a substrate.
Claim 15
Dependent Claim
38 words
The conductive ink of claim 18 wherein the bulk resistivity of said particle-filled binder is greater than 10 -1 ohm cm and the amount of said fibrils reduces the bulk resistivity to less than 10 -1 ohm cm.
Claim 16
Dependent Claim
46 words
The conductive ink of claim 13 wherein the bulk resistivity of said particle-filled binder is greater than 1 ohm cm, and the amount of said fibrils is less than or equal to 30% by weight and reduces the bulk resistivity to less than 1 ohm cm.
Claim 17
Dependent Claim
13 words
The conductive ink of claim 13 wherein said metal particles comprise silver flakes.
Claim 18
Dependent Claim
21 words
The composite of claim 1 wherein said fibrils comprise tubes having graphitic layers that are substantially parallel to the fibril axis.
Claim 19
Dependent Claim
18 words
The composite of claim 17 wherein the length to diameter ratio of said fibrils is at least 5.
Claim 20
Dependent Claim
18 words
The composite of claim 17 wherein the diameter of said fibrils is between 3.5 and 75 nanometers, inclusive.
Claim 21
Dependent Claim
17 words
The composite of claim 17 wherein said fibrils are substantially free of a continuous thermal carbon overcoat.
Claim 22
Dependent Claim
12 words
The composite of claim 1 wherein said binder comprises a thermoplastic resin.
Claim 23
Dependent Claim
20 words
The composite of claim 21 wherein said binder comprises a polyethylene, polypropylene, polyamide, polyurethane, polyvinyl chloride, or thermoplastic polyester resin.
Claim 24
Dependent Claim
12 words
The composite of claim 1 wherein said binder comprises a thermoset resin.
Claim 25
Dependent Claim
16 words
The composite of claim 23 wherein said binder comprises a saturated polyester, alkyd, or epoxy resin.
Claim 26
Dependent Claim
13 words
The coating of claim 2 or 3 further comprising at least one pigment.
Claim 27
Dependent Claim
27 words
A substrate coated with an electrically conductive composite comprising a polymeric binder into which carbon fibrils in an amount not greater than 30% by weight are incorporated.
Claim 28
Dependent Claim
27 words
A substrate coated with an electrically conductive composite comprising a polymeric binder into which carbon fibrils in an amount not greater than 30% by weight are incorporated.
Claim 29
Dependent Claim
19 words
The substrate of claim 26 wherein the conductivity of said composite permits said substrate to be electrostatically overcoated directly.
Claim 30
Dependent Claim
34 words
The substrate of claim 26 wherein said substrate comprises a substrate for a printed circuit board and said composite is a resistive ink printed on said substrate in the form of an electronic component.
Claim 31
Dependent Claim
12 words
The substrate of claim 28 wherein said electronic component is a resistor.
Claim 32
Dependent Claim
39 words
The substrate of claim 26 wherein said substrate comprises a substrate for a printed circuit board and said composite is a conductive ink printed on said substrate in the form of a conductive trace for electrically connecting electronic components.
Claim 33
Independent Claim
39 words
A method for coating a substrate comprising the steps of preparing an electrically conductive coating by incorporating carbon fibrils in an amount not greater than 30% by weight into a polymeric binder; and applying said coating to said substrate.
Claim 34
Independent Claim
39 words
A method for coating a substrate comprising the steps of preparing an electrically conductive coating by incorporating carbon fibrils in an amount not greater than 30% by weight into a polymeric binder; and applying said coating to said substrate.
Claim 35
Dependent Claim
16 words
The method of claim 31 further comprising electrostatically applying an overcoating directly to the coated substrate.
Claim 36
Independent Claim
39 words
A method for printing on a substrate comprising the steps of preparing an ink by incorporating carbon fibrils in an amount not greater than 30% by weight into a polymeric binder; and screen printing said ink on said substrate.
Claim 37
Independent Claim
39 words
A method for printing on a substrate comprising the steps of preparing an ink by incorporating carbon fibrils in an amount not greater than 30% by weight into a polymeric binder; and screen printing said ink on said substrate.
Claim 38
Dependent Claim
17 words
The coating of claim 25 wherein said coating is overpigmented such that it does not appear black.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
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| 3.5 Years (Year 4) | 1995-03-24 | 1995-09-23 | 1996-03-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1999-03-24 | 1999-09-23 | 2000-03-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2003-03-24 | 2003-09-23 | 2004-03-24 | $7700.00 | Window Closed / Lapsed |