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US 4,956,203 AGranted
Electrically conductive silicone compositions
AssigneeDow Corning Corporation
InventorLoretta N. Kroupa
Life of this patent
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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.sub.3 Si).sub.2 NH where R is a substituted or unsubstituted alkyl radical of from 1 to 6 carbon atoms or hydroxyl endblocked polymethylphenylsiloxane.
Claims7
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.sub.3 Si).sub.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.degree. C.,
- (C) admixing from 3 to 40 parts by weight of conductive carbon particles, and
- (D) drying and powdering the resulting hydrophobic carbon particles.
1 more element
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.sub.3 Si).sub.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.
1 more element
Dependencies are inferred from the claim text.