Patent ID: 6988795

Claim:
An inkjet ink comprising a pigment, a water-soluble solvent and water, the water-soluble solvent comprising: a first water-soluble solvent group comprising a water-soluble solvent represented by the following general formula (I) and having a solubility parameter SP 1 ; a second water-soluble solvent group comprising a water-soluble solvent having a solubility parameter which is at least 1 greater than the solubility parameter SP 1 and; a third water-soluble solvent group comprising a water-soluble solvent having a solubility parameter which is at least 1 less than the solubility parameter SP 1 ; wherein respective contents (% by mass) of the water-soluble solvent groups contained in the inkjet ink satisfy the following equation (1) and the following equation (2): HO—(CHR—CH 2 —O—) n —H General formula (I) W 2 /W 1 ≧1.5 Equation (1) 0.25≦ W 3 /W 1 ≦0.75 Equation (2) wherein in general formula (I), equation (1) and equation (2), n represents an integer of 3 to 6; R represents hydrogen or a methyl group; W 1 represents a content (% by mass) of the first water-soluble solvent group contained in the inkjet ink; W 2 represents a content (% by mass) of the second water-soluble solvent group contained in the inkjet ink; and W 3 represents a content (% by mass) of the third water-soluble solvent group contained in the inkjet ink.