Canon Finetech Inc.

Junko Morioka

Tomoya Yamamoto

Takayuki Ookawa

Yukiko Tachibana

Hitoshi Inoue

Ryoji Yashiro

In the present invention, an inkjet recording ink can be provided, which ink can record stably an image with good fastness and elegant-quality over a long period in any conditions. The ink includes a high-molecular dispersant, a water-insoluble colorant, water-soluble organic solvent and water, in which the high-molecular dispersant is a block copolymer including at least one hydrophobic block and at least one hydrophilic block, which have been obtained by polymerizing vinyl ethers as monomers, respectively; and the water-insoluble colorant is a specific pigment. Further the present invention can provide a inkjet recording method, an inkjet cartridge, and an inkjet recording system.

Ink for inkjet recording, method of inkjet recording, ink cartridge and inkjet recording apparatus

An inkjet recording ink is composed of an encapsulated water-insoluble colorant encapsulated with a high-molecular dispersant, a water-soluble organic solvent, and water. The water-insoluble colorant is at least one colorant selected from the group consisting of C.I. Solvent Yellow 21, 42, 79, 82, 83:1, 88 and 151, at least one colorant selected from the group consisting of C.I. Solvent Red 8, 49, 83:1, 91, 127 and 218, at least one colorant selected from the group consisting of C.I. Solvent Black 3, 27, 29 and 45, or at least one colorant selected from the group consisting of C.I. Solvent Blue 25, 38, 44, 67 and 70. The high-molecular dispersant is a block copolymer comprising at least one hydrophobic block and at least one hydrophilic block, which have been obtained by polymerizing vinyl ethers as monomers, respectively. The inkjet recording ink can stably record images of high fastness and excellent quality over a long period even under severe environmental conditions.

Inkjet recording ink, inkjet recording method, ink cartridge, and inkjet recording system

A water-based inkjet printer ink contains at least a colorant and a resin. The resin is a block copolymer, which contains at least one hydrophilic block and at least one hydrophobic block. Each of the blocks is a vinyl ether polymer, wherein said block copolymer is obtained by polymerizing vinyl ethers as monomer by using at least one aluminum compound selected from the group consisting of tripropylaluminum, triisopropylaluminum and aluminum compounds as Ziegler-Natta catalysts.

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Mitsukaido, Japan

Junko Morioka