Patent US4265789A successfully refreshed from Google Patents.
US4265789A
Expired / Lapsed
US
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Conductive polymer processable as a thermoplastic
Assignee: Polymer Cencentrates Inc
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Filing: 1979-10-22
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Granted: 1981-05-05
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Expires: 1999-10-22
Abstract
Abstract A flexible conductive composition of carbon black or other fine conductive particles dispersed in a high molecular weight polymer matrix composed of two phases--a soft elastomeric, low glass transition temperature phase and a hard, crystalline and high glass transition temperature phase.
Inventors
- 👤 Phillips Christopherson
- 👤 Rene Aelion
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 23:15
CPC Classifications
C; C08; C08K; C08K3/00; C08K3/02; C08K3/04; C08J; C08J3/00; C08J3/20; C08J3/203; H; H01; H01B; H01B1/00; H01B1/20; H01B1/24; Y; Y10; Y10T; Y10T428/00; Y10T428/29; Y10T428/2913; Y10T428/2918; Y10T428/30
Claims Analysis
Total Claims: 18
Claim 1
Independent Claim
171 words
A flexible conductive plastic composite processable as a thermoplastic resin by injection molding or extrusion and having a volume resistivity of less than 10 ohm per cm, a Brabender torque of less than 1500 meter per grams at a temperature of 20° C. above melt, a minimum elongation at break of 50% and a brittleness temperature at failure of less than -10° C., the composition comprising a matrix of two phases, one an elastomeric amorphous polymer of glass transition temperature of less than 10° C., the other phase a crystalline polymer or copolymer with a glass transition temperature above 25° C., the two phases being bound together, the crystalline phase comprising less than 60% of the total of the two phases by mole concentration, and a dispersion in said two phase matrix of conductive particles characterized by a volume resistivity of 0.01 to 1 ohm/cm and a dibutylphthalate/oil absorption of at least 150 cc per 100 grams and comprising as a percentage by weight of the composite of 15% to 75%.
Claim 2
Dependent Claim
171 words
A flexible conductive plastic composite processable as a thermoplastic resin by injection molding or extrusion and having a volume resistivity of less than 10 ohm per cm, a Brabender torque of less than 1500 meter per grams at a temperature of 20° C. above melt, a minimum elongation at break of 50% and a brittleness temperature at failure of less than -10° C., the composition comprising a matrix of two phases, one an elastomeric amorphous polymer of glass transition temperature of less than 10° C., the other phase a crystalline polymer or copolymer with a glass transition temperature above 25° C., the two phases being bound together, the crystalline phase comprising less than 60% of the total of the two phases by mole concentration, and a dispersion in said two phase matrix of conductive particles characterized by a volume resistivity of 0.01 to 1 ohm/cm and a dibutylphthalate/oil absorption of at least 150 cc per 100 grams and comprising as a percentage by weight of the composite of 15% to 75%.
Claim 3
Dependent Claim
32 words
Composite of claim 1 wherein the conductive particle is a carbon black with a nitrogen surface area, BET method, of at least 250 square meter per gram, and less than 2% volatiles.
Claim 4
Dependent Claim
18 words
Composite of claim 1 wherein the matrix comprises a polyolefin diene elastomer phase and a polyolefin crystalline phase.
Claim 5
Dependent Claim
11 words
Composite of claim 3 wherein the diene is 1-4 hexane diene.
Claim 6
Dependent Claim
10 words
Composite of claim 3 where the diene is ethylidene norbornene.
Claim 7
Dependent Claim
14 words
Composite of claim 3 wherein the polyolefin is a copolymer of ethylene and propylene.
Claim 8
Dependent Claim
17 words
Composite of claim 3 wherein the ethylene propylene 1-4 hexane diene is blended with high density polyethylene.
Claim 9
Dependent Claim
14 words
Composite of claim 3 where ethylene propylene 1-4 hexane diene is blended with polypropylene.
Claim 10
Dependent Claim
17 words
Composite of claim 1 wherein the matrix comprises a polybutadiene elastomer phase and a polystyrene crystalline phase.
Claim 11
Dependent Claim
16 words
Composite of claim 1 wherein the matrix comprises a polyether elastomer and a polyurethane crystalline phase.
Claim 12
Dependent Claim
16 words
Composite of claim 10 wherein the polyurethane is a 2,4 toluene diisocyanate copolymerized with butylene adipate.
Claim 13
Dependent Claim
13 words
Composite of claim 10 wherein the polyurethane is based on 2,6 toluene diisocyanate.
Claim 14
Dependent Claim
17 words
Composite of claim 1 wherein the matrix comprises a polyether elastomer phase and a polyester crystalline phase.
Claim 15
Dependent Claim
20 words
Composite of claim 13 wherein the polyester is a terephthalic acid butane diol and the polyether is polytetramethylene ether glycol.
Claim 16
Dependent Claim
11 words
Composite of claim 1 wherein the polymer matrix is a fluoroelastomer.
Claim 17
Dependent Claim
91 words
Process for making the polymeric composite of claim 1, wherein an amount 10 to 90% of mole concentration of the total amount of an elastomer-crystalline polymer material required for a given composite is first pulverized to decrease its particle size and such portion is blended with substantially the totality of the conductive particles required for a given composite in a low force mixer, then adding to this initial blend, in a second step, the remaining non-pulverized polymeric composition, and then finally blending the composite as a whole under low force conditions.
Claim 18
Dependent Claim
19 words
Process in accordance with claim 16 wherein 30 to 70% of initial polymer is pulverized in said first step.
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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) | 1984-05-04 | 1984-11-03 | 1985-05-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-05-04 | 1988-11-03 | 1989-05-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-05-04 | 1992-11-03 | 1993-05-05 | $7700.00 | Window Closed / Lapsed |