CARBON BLACK PIGMENT FOR AQUEOUS INK

摘要

PROBLEM TO BE SOLVED: To obtain a carbon black pigment highly dispersible in water and suitable for aqueous black inks. SOLUTION: This carbon black pigment for aqueous inks has the following characteristics: nitrogen adsorption specific surface area (N2SA) is 160-200 m2/g; iodine adsorption(IA) is 140-190 mg/g; N2SA/IA is 0.96-1.20; CTAB specific surface area is 140-170 m2/g; DBP oil absorption is 100-140 mL/100 g; 24M4DBP oil absorption is 90-110 mL/100 g; tinting strength (Tint) is >=120; the ratio of total oxygen atom to total carbon atom (oxygen bond energy intensity/carbon bond energy intensity) determined by X-ray photoelectron spectroscopy is >=0.1; the mode diameter Dst of the aggregate's Stokes-equivalent diameter distribution is 50-70 nm; half-value widthΔDst is <=60 nm; agglomerate's mean diameter Dupa50% is 60-110 nm; and agglomerate's maximum diameter Dupa99% is <=250 nm.