Canon Finetech Inc.

Yuusuke Sumikawa

Takahiro Tsutsui

Shintaro Suzuki

Masato Kawakami

Eriko Himura

Kanako Aratani

Ryuta Aoto

An ink jet recording head, includes a nozzle array of nozzle flow paths; ink ejection orifices communicating with the nozzle flow paths; heaters in the nozzle flow paths; and ink with which the head is filled. The ink contains a coloring material, an acetylene glycol-based surfactant, and water, the surfactant containing one or more kinds of an acetylene glycol or an ethylene oxide adduct thereof, an average addition number of moles of ethylene oxide of the whole surfactant being 3 to 7. The ink has a viscosity of 1.5 mPa&#xb7;s to 3.0 mPa&#xb7;s. The head is a line type head having an opening area of each ink ejection orifice of 100 &#x3bc;mto 350 &#x3bc;m, a total number of nozzles of 1,200 or more, and a length of the nozzle array of 2 inches or more, and the head is driven at a frequency of 1 kHz to 10 kHz.

Recording head for ink jet recording, ink jet recording apparatus, and ink jet recording method

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).

Ink jet recording ink, ink jet recording method, ink jet recording head, and ink jet recording apparatus

An ink-jet recording ink set includes: an ink (I) containing a dye D1, a compound C1 represented by the following formula and having a U+V of S1, and water; and an ink (II) containing a dye D2, a compound C2 represented by the following formula and having a U+V of S2, and water in which in case that a surface tension &#x3b3;L1 (mN/m) of an evaluation liquid L1 obtained by adding, to a 5 mass % aqueous solution of the dye D1, a compound C3 in an amount corresponding to 1 mass % of the aqueous solution, and a surface tension &#x3b3;L2 (mN/m) of an evaluation liquid L2 obtained by adding, to a 5 mass % aqueous solution of the dye D2, the compound C3 in an amount corresponding to 1 mass % of the aqueous solution satisfy a relationship of &#x3b3;L1&#x2212;&#x3b3;L2&#x2267;10 (mN/m), the S1 and the S2 satisfy a relationship of 2&#x2266;S2&#x2212;S1&#x2266;7. 

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Kashiwa, Japan

Yuusuke Sumikawa