CARBON BLACK PIGMENT FOR WATER-BASED INK

Japanese Patent JP3905681

B2

PROBLEM TO BE SOLVED: To provide a carbon black pigment having excellent dispersion performance into water and suitable for a water-based black ink.
SOLUTION: The carbon black pigment for a water-based ink has an atomic ratio (the intensity of oxygen bonding energy/that of carbon bonding energy) of the entire oxygen atoms to the entire carbon atoms, measured by X-ray photoelectron spectroscopy, of ≥0.1 by chemically modifying carbon black having a nitrogen adsorption specific area (N2SA) of 200-270 m2/g, an iodine adsorption amount (IA) of 190-260 mg/g, a ratio of N2SA to IA of 0.96-1.20, a CTAB specific area of 170-240 m2/g, a DBP absorption amount of 100-150 cm3/100 g, a 24M4DBP absorption amount of 90-120 cm3/100 g, and a Tint of ≥135. Furthermore, the carbon black pigment has particle properties such that the modal diameter Dst of a stokes diameter distribution of an aggregate is 30-60 nm; the half width ΔDst in the distribution is ≤60 nm; the Dupa 50% value of the average particle diameter of an agglomerate is 60-110 nm; and the Dupa 99% value of the maximum diameter of the agglomerate is ≤210 nm.

Keisuke Arai
Masataka Kono

JP2000108949A

April 18, 2007

April 11, 2000

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Tokai Carbon Co., Ltd.

C09C1/48; B82Y20/00; B82Y30/00; C09C3/06; C09D11/00; C09D11/322; C09D11/324; (IPC1-7): C09C1/48; C09C3/06; C09D11/00

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JP2000256576A
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JP2001040239A

Yasuo Fukuda
Kenji Akatsuka

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