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US 2007/0181855 A1Published application
Carbon-based electrically conducting filler, composition and use thereof
OwnerYuji Nagao, Ryuji Yamamotoinventors
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OwnerYuji Nagao, Ryuji Yamamotoinventors
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A conductive composition comprising a vapor grown carbon fiber having an aspect ratio of 40 to 1,000, preferably 65 to 1,000, and a specific surface area or fiber diameter of the fiber within a predetermined range, and a preferable peak intensity ratio (I0=I1360/I1580) of 0.1 to 1, wherein I1580 represents a peak height at 1,580 cm−1 and I1360 represents a peak height at 1,360 cm−1 in a Raman scattering spectrum; and a resin composition containing the composition; and a production method thereof. The present invention provides: i) a composition which exhibits stable conductivity and less deterioration in physical properties during any molding methods in a conductive plastic in which a conductive filler is dispersed in a polymer; ii) a composite material composition for precision molding which enables production of a molded product with low warpage and is excellent in mechanical properties and performance during the injection molding; and iii) a sliding member composition which exhibits durability under high temperature and heavy load and has a low friction coefficient.
A conductive filler for a conductive resin, characterized by comprising a vapor grown carbon fiber having a specific surface area of 10 to 50 m2/g and an aspect ratio of 65 to 1,000.
A composite material composition produced by kneading a matrix synthetic resin and a vapor grown carbon fiber, wherein the vapor grown carbon fiber has a fiber diameter of 50 to 200 nm, an aspect ratio of 40 to 1,000, and a peak intensity ratio (I0=I1360/I1580) of 0.1 to 1, wherein I1580 represents a peak height at 1,580 cm−1 and 11360 represent peak height at 1,360 cm−1 in a Raman scattering spectrum, and the composition exhibits an anisotropic ratio in mold shrinkage of 0.5 or more.
A method for producing a composite material composition characterized by comprising kneading a thermoplastic resin and a vapor grown carbon fiber having a fiber diameter of 50 to 200 nm, an aspect ratio of 40 to 1,000, a bulk density of 0.01 to 0.1 and a peak intensity ratio (I0=I1360/I1580) of 0.1 to 1, wherein I1580 represents a peak height at 1,580 cm−1 and I1360 represents a peak height at 1,360 cm−1 in a Raman scattering spectrum, wherein the kneading is performed without applying strong shear force, so as to suppress breakage rate of the carbon fiber to 20% or less.
A sliding member composition produced by kneading a matrix synthetic resin and a vapor grown carbon fiber, wherein the vapor grown carbon fiber has a fiber diameter of 50 to 200 nm, an aspect ratio of 40 to 1,000, and a peak intensity ratio (I0=I1360/I1580) of 0.1 to 1, wherein I11580 represents a peak height at 1,580 cm−1 and I11360 represents a peak height at 1,360 cm−1 in a Raman scattering spectrum, and the composition exhibits a heat deflection temperature of 160° C. or higher under heavy load, as determined in accordance with ASTM D 648.
A method for producing a sliding member composition characterized by comprising kneading a thermoplastic resin and a vapor grown carbon fiber having a fiber diameter of 50 to 200 nm, an aspect ratio of 40 to 1,000, a bulk density of 0.01 to 0.1, and a peak intensity ratio (I0=I1360/I1580) of 0.1 to 1, wherein I1580 represents a peak height at 1,580 cm−1 and I1360 represents a peak height at 1,360 cm−1 in a Raman scattering spectrum, wherein the kneading is performed without applying strong shear force so as to suppress breakage rate of the carbon fiber to 20% or less.
Dependencies are inferred from the claim text.