Patent ID: 7481524

Claim:
An inkjet recording ink comprising: a high-molecular dispersant; a water-insoluble colorant encapsulated with said high-molecular dispersant, said colorant being at least one colorant selected from the group consisting of C.I. Pigment Yellow 3, C.I. Pigment Yellow 74, C.I. Pigment Yellow 93, C.I. Pigment Yellow 95, C.I. Pigment Yellow 109, C.I. Pigment Yellow 120, C.I. Pigment Yellow 128, C.I. Pigment Yellow 138, C.I. Pigment Yellow 151, C.I. Pigment Yellow 175, C.I. Pigment Yellow 183, C.I. Pigment Yellow 184, C.I. Pigment Black 1, C.I. Pigment Black 7, C.I. Pigment Black 10, C.I. Pigment Black 31, C.I. Pigment Black 32, C.I. Pigment Red 12, C.I. Pigment Red 122, C.I. Pigment Red 184, C.I. Pigment Red 202, C.I. Pigment Violet 19, C.I. Pigment Violet 32, C.I. Pigment Blue 15:1, C.I. Pigment Blue 15:2, C.I. Pigment Blue 15:3, C.I. Pigment Blue 15:4, C.I. Pigment Blue 15:6, C.I. Pigment Blue 16, and C.I. Pigment Green 7; a water-soluble organic solvent; at least one compound selected from the group consisting of a calcium compound and a magnesium compound; an aluminum compound; and water, wherein said high-molecular dispersant is a block copolymer comprising at least one hydrophobic block and at least one hydrophilic block, and said at least one hydrophobic block and at least one hydrophilic block have been obtained by polymerizing vinyl ethers as monomers, respectively, and a content of said aluminum compound in said ink is from 1:300 to 1:20 in terms of a molar ratio of said aluminum compound to said high-molecular dispersant, wherein a weight percent of said at least one compound to said inkjet recording ink is in the range of from 0.00015 wt.% to 0.05 wt.%, and wherein a weight percent of said aluminum compound to said inkjet recording ink is in the range of from 0.00002 wt.% to 0.002 wt.%.