Dainichiseika Color & Chemicals Mfg. Co., Ltd.

Nagano Keiki Co., Ltd.

Yuzuru Sato

Yoshikazu Murakami

Hiroyuki Shimanaka

Toshiaki Kobayashi

Seiji Doi

Jun Kamabayashi

Takayuki Ite

There is provided a carbon material dispersion which has excellent dispersibility and in which the dispersibility is retained stably over a long period of time even when the carbon material dispersion contains a carbon material at a high concentration. The carbon material dispersion is a carbon material dispersion containing a carbon material, water, and a polymeric dispersant, wherein the polymeric dispersant is a polymer including 5 to 40% by mass of a constituent unit (1) derived from a monomer 1, such as 2-vinylpyridine, 50 to 80% by mass of a constituent unit (2) derived from a monomer 2 represented by formula (1) (wherein Rrepresents a hydrogen atom or the like, A represents O or NH, X represents an ethylene group or a propylene group, Y represents O, NHCOO, or NHCONH, each of Rrepresents a hydrogen atom or the like, n represents 20 to 100, and Rrepresents a hydrogen atom or the like), and 0.5 to 40% by mass of a constituent unit (3) derived from a monomer 3 copolymerizable with above-described monomers.

Carbon material dispersion

A numeral-displaying face provided with a numeral-display and an exterior wall intersecting a periphery of the numeral-displaying face are provided on a cover and a case body of an indicator. A monitor indicator for checking an operating condition of the indicator is provided on the exterior wall. An outer circumference of the monitor indicator is flush with the exterior wall. A fallen object does not collide with the monitor indicator, so that damage on the monitor indicator can be prevented.

Indicator

Growing community of inventors

Tokyo, Japan

Yuzuru Sato