CARBON BLACK, METHOD FOR PRODUCING THE SAME, AND ITS USE

• US 20100160539A1
• Filed: 07/27/2006
• Published: 06/24/2010
• Est. Priority Date: 07/27/2005
• Status: Active Grant

• Current Assignee: Denka Singapore Private Limited
• Original Assignee: Denka Singapore Private Limited
• Inventors: Sasaki, Yoshio
• Granted Patent: US 8,114,937 B2
• Time in Patent Office: Days
• US Class Current: 524/577
• CPC Class Codes: C01P 2004/32 Spheres
• CPC Class Codes: C09C 1/54 Acetylene black; thermal black ; Preparation thereof separation or recovery C09C1/487

Abstract

A carbon black having excellent conductivity-imparting ability, a method for producing the same, and a conductive composition containing the same are disclosed. The carbon black comprises a chain body comprising (1) chain parts of spherical carbon particles and (2) chain parts of rod-shaped carbon particles, the chain part (1) and the chain part (2) being connected, and is produced by supplying a raw material mixture comprising acetylene gas, hydrocarbon and a catalyst for carbon nanotube formation to a high temperature field having a temperature equal to or higher than a thermal decomposition temperature of the hydrocarbon, and heat treating the mixture, or by supplying hydrocarbon containing a catalyst for carbon nanotube formation, during pyrolysis of acetylene gas and/or in the state that acetylene gas has been pyrolyzed, and heat treating the resulting mixture at a temperature equal to or higher than a thermal decomposition temperature of the hydrocarbon.

Claims

1. A carbon black comprising a chain body which comprises (1) chain parts of spherical carbon particles and (2) chain parts of rod-shaped carbon particles, the chain part (1) and the chain part (2) being connected.

2. The carbon black as claimed in claim 1, wherein the chain part of the spherical carbon particles comprises acetylene black, and the chain part of the rod-shaped carbon particles comprises a carbon black other than acetylene black.

3. A carbon black powder comprising the carbon black as claimed in claim 1 or 2 and a carbon black other than the carbon black.

4. The carbon black powder as claimed in claim 3, which contains the carbon black as claimed in claim 1 or 2 in an amount of 10% by weight or more based on the weight of the carbon black powder.

7. A composition comprising resins and/or rubbers, and the carbon black as claimed in claim 1 or 2 or the carbon black powder as claimed in claim 3 or 4 compounded therewith.

5. A method of producing a carbon black, comprising supplying a raw material mixture comprising acetylene gas, hydrocarbon and a catalyst for carbon nanotube formation to a high temperature field having a temperature equal to or higher than a thermal decomposition temperature of the hydrocarbon, and heat treating the mixture.

6. A method of producing a carbon black, comprising supplying hydrocarbon containing a catalyst for carbon nanotube formation, during pyrolysis of acetylene gas and/or in the state that acetylene gas has been pyrolyzed, and heat treating the resulting mixture at a temperature equal to or higher than a thermal decomposition temperature of the hydrocarbon.