Patent US4956203A successfully refreshed from Google Patents.
US4956203A
Expired / Lapsed
US
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Electrically conductive silicone compositions
Assignee: Dow Silicones Corp
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Filing: 1989-11-20
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Granted: 1990-09-11
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Expires: 2009-11-20
Abstract
Abstract An improved electrically conductive polydiorganosiloxane of the type comprising a polydiorganosiloxane and conductive carbon particles has been developed. The improved electrical conductivity results from the addition of a conductivity improver comprising disilazane of the formula (R 3 Si) 2 NH where R is a substituted or unsubstituted alkyl radical of from 1 to 6 carbon atoms or hydroxyl endblocked polymethylphenylsiloxane.
Inventors
- 👤 Loretta N. Kroupa
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 22:22
CPC Classifications
H; H01; H01B; H01B1/00; H01B1/20; H01B1/24; C; C08; C08K; C08K3/00; C08K3/02; C08K3/04; C08K5/00; C08K5/54; C08K5/544; C08K5/5445; C08K2201/00; C08K2201/001; Y; Y10; Y10T; Y10T428/00; Y10T428/29; Y10T428/2982; Y10T428/2991; Y10T428/2998
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
116 words
A method of preparing an improved electrically conductive carbon particle comprising (A) adding 100 parts by weight of inert solvent to a mixer, (B) admixing from 6 to 30 parts by weight per 100 parts by weight of the carbon particles of (C) of conductivity improver selected from the group consisting of disilazane of the formula (R 3 Si) 2 NH where R is a substituted or unsubstituted alkyl radical of from 1 to 6 carbon atoms, and hydroxyl endblocked polymethylphenylsiloxane having a viscosity of from 0.1 to 1.0 Pa.s at 25° C., (C) admixing from 3 to 40 parts by weight of conductive carbon particles, and (D) drying and powdering the resulting hydrophobic carbon particles.
Claim 2
Independent Claim
116 words
A method of preparing an improved electrically conductive carbon particle comprising (A) adding 100 parts by weight of inert solvent to a mixer, (B) admixing from 6 to 30 parts by weight per 100 parts by weight of the carbon particles of (C) of conductivity improver selected from the group consisting of disilazane of the formula (R 3 Si) 2 NH where R is a substituted or unsubstituted alkyl radical of from 1 to 6 carbon atoms, and hydroxyl endblocked polymethylphenylsiloxane having a viscosity of from 0.1 to 1.0 Pa.s at 25° C., (C) admixing from 3 to 40 parts by weight of conductive carbon particles, and (D) drying and powdering the resulting hydrophobic carbon particles.
Claim 3
Dependent Claim
37 words
The method of claim 1 in which the conductivity improver consists of disilizane of the formula (R 3 Si) 2 NH where R is a substituted or unsubstituted alkyl radical of from 1 to 6 carbon atoms.
Claim 4
Dependent Claim
27 words
The method of claim 1 in which the conductivity improver consists of hydroxyl endblocked polymethylphenylsiloxane having a viscosity of from 0.1 to 1.0 Pa.s at 25° C.
Claim 5
Independent Claim
96 words
A method of preparing an improved electrically conductive carbon particle comprising (A) adding 100 parts by weight of inert solvent to a mixer, (B) admixing from 6 to 30 parts by weight per 100 parts by weight of the carbon particles of (C) of conductivity improver consisting of disilazane of the formula (R 3 Si) 2 NH where R is a substituted or unsubstituted alkyl radical of from 1 to 6 carbon atoms, (C) admixing from 3 to 40 parts by weight of conductive carbon particles, and (D) drying and powdering the resulting hydrophobic carbon particles.
Claim 6
Independent Claim
96 words
A method of preparing an improved electrically conductive carbon particle comprising (A) adding 100 parts by weight of inert solvent to a mixer, (B) admixing from 6 to 30 parts by weight per 100 parts by weight of the carbon particles of (C) of conductivity improver consisting of disilazane of the formula (R 3 Si) 2 NH where R is a substituted or unsubstituted alkyl radical of from 1 to 6 carbon atoms, (C) admixing from 3 to 40 parts by weight of conductive carbon particles, and (D) drying and powdering the resulting hydrophobic carbon particles.
Claim 7
Dependent Claim
11 words
The improved carbon particle produced by the method of claim 1.
Claim 8
Dependent Claim
11 words
The improved carbon particle produced by the method of claim 2.
Claim 9
Dependent Claim
11 words
The improved carbon particle produced by the method of claim 3.
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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) | 1993-09-10 | 1994-03-12 | 1994-09-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-09-10 | 1998-03-12 | 1998-09-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-09-10 | 2002-03-12 | 2002-09-11 | $7700.00 | Window Closed / Lapsed |