Carbon nanotube dispersion and utilization of same
First Claim
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1. A carbon nanotube dispersion comprising carbon nanotubes dispersed in a liquid medium, wherein:
- the liquid medium includes an alcohol solvent and a polyvinyl butyral resin, 0.5 mg to 200 mg of the carbon nanotubes are dispersed per 100 mL of the alcohol solvent,a weight ratio of the polyvinyl butyral resin to the carbon nanotubes is between 0.5 and 2 andthe polyvinyl butyral resin exhibits a solution viscosity of 5 mPa·
s to 30 mPa·
s at 20°
C. when dissolved at a concentration of 10% by weight in a mixed solvent consisting of ethanol and toluene at a volume ration of 1;
1.
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Abstract
The present invention provides a carbon nanotube dispersion, in which carbon nanotubes are uniformly dispersed and a satisfactory dispersed state is maintained over a long period of time, and also inherent properties of carbon nanotubes can be exhibited. The carbon nanotube dispersion contains an alcohol solvent (preferably a lower alcohol having about 1 to 4 carbon atoms) and a polyvinyl acetal resin.
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Citations
20 Claims
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1. A carbon nanotube dispersion comprising carbon nanotubes dispersed in a liquid medium, wherein:
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the liquid medium includes an alcohol solvent and a polyvinyl butyral resin, 0.5 mg to 200 mg of the carbon nanotubes are dispersed per 100 mL of the alcohol solvent, a weight ratio of the polyvinyl butyral resin to the carbon nanotubes is between 0.5 and 2 and the polyvinyl butyral resin exhibits a solution viscosity of 5 mPa·
s to 30 mPa·
s at 20°
C. when dissolved at a concentration of 10% by weight in a mixed solvent consisting of ethanol and toluene at a volume ration of 1;
1. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
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15. A method for producing a dispersion comprising carbon nanotubes dispersed in a liquid medium, comprising:
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preparing a liquid medium containing an alcohol solvent and a polyvinyl butyral resin, placing carbon nanotubes in a container along with the liquid medium and carrying out a dispersion treatment on the contents of the container, wherein 0.5 mg to 200 mg of the carbon nanotubes are dispersed per 100 mL of the alcohol solvent, a weight ratio of the polyvinyl butyral resin to the carbon nanotubes is between 0.5 and 2 and the dispersion treatment includes at least stirring and application of ultrasound; and the polyvinyl butyral resin exhibits a solution viscosity of 5 mPa·
s to 30 mPa·
s at 20°
C. when dissolved at a concentration of 10% by weight in a mixed solvent consisting of ethanol and toluene at a volume ratio of 1;
1. - View Dependent Claims (16, 17, 18, 19)
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20. A liquid dispersion comprising carbon nanotubes dispersed in a liquid medium, wherein the liquid medium comprises at least one alcohol and at least one polyvinyl butyral resin, a weight-to-volume ratio of the carbon nanotubes to the alcohol is 0.5-200 milligrams of carbon nanotubes per 100 milliliters of alcohol and a weight ratio of the polyvinyl butyral resin to the carbon nanotubes is between 0.5 and 2 and
the polyvinyl butyral resin exhibits a solution viscosity of 5 mPa· - s to 30 mPa·
s at 20°
C. when dissolved at a concentration of 10% by weight in a mixed solvent consisting of ethanol and toluene at a volume ratio of 1;
1.
- s to 30 mPa·
Specification