Canon Finetech Inc.

Kanako Aratani

Takahiro Tsutsui

Shintaro Suzuki

Masato Kawakami

Yuusuke Sumikawa

Ryuta Aoto

An ink jet recording ink including a pigment; water; and water-soluble compounds. The pigment comprises a resin-dispersed pigment dispersed with a (meth)acrylate-based random copolymer having an acid value of 100-160 mgKOH/g. The water-soluble compounds include at least ethylene urea and a water-soluble compound having a hydrophilicity-hydrophobicity coefficient defined by the following equation (A) of 0.37 or less The total content of the water-soluble compounds is 22-50 mass % with respect to the total amount of the ink The content of the ethylene urea is 11.0 mass % or more with respect to the total amount of the ink, and the proportion of the amount of the ethylene urea in the total amount of the water-soluble compounds is 50% by mass or less,Hydrophilicity-hydrophobicity coefficient=((water activity value of 20% aqueous solution)&#x2212;(molar fraction of water in 20% aqueous solution))/(1&#x2212;(molar fraction of water in 20% aqueous solution))&#x2003;&#x2003;Equation (A).

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Kashiwa, Japan

Kanako Aratani