Brother Kogyo Kabushiki-kaisha

Yuka Tsuzaka

Mitsunori Maeda

Satoshi Okuda

Akihiko Taniguchi

Kazuma Goto

Taro Nagano

Shinpei Ito

Keisuke Yuhara

A water-based ink for ink-jet recording includes: water; a solid solution pigment composed of at least a first pigment and a second pigment; and a non-solid solution pigment which is the same as the first pigment. An image L*of the first pigment has the highest chromaticness C* among those of pigments composing the solid solution pigment, the image L*having lightness L* which is closest to 60 among a plurality of solid images recorded on a recording paper by using one of aqueous dispersions containing the pigments composing the solid solution pigment at a same solid content concentration, respectively, while changing recording duty at every 5% in a range of 0% to 100%.

Water-based ink for ink-jet recording and ink set

A water-based ink for ink-jet recording includes dyes and water. The dyes include a blue dye having a hue angle of 220&#xb0; to 280&#xb0;; a yellow dye having a hue angle of 70&#xb0; to 120&#xb0;; and a copper phthalocyanine dye. A mass ratio (C/B) of a content (C) of the copper phthalocyanine dye to a content (B) of the blue dye in an entire amount of the water-based ink is equal to or more than 0.5, and a total content of the dyes in the entire amount of the water-based ink is equal to or more than 6% by mass.

Water-based ink for ink-jet recording

There is provided a water-based ink for ink-jet recording including: water; a self-dispersible black pigment; and a resin-dispersed pigment of which hue angle is in a range of 180&#xb0; to 270&#xb0; and of which sedimentation velocity in the water-based ink is slower than sedimentation velocity of the self-dispersible black pigment in the water-based ink. A ratio (R/S) of a solid content weight (R) of the resin-dispersed pigment to a solid content weight (S) of the self-dispersible black pigment in the water-based ink is in a range of 0.26 to 0.80.

Water-based ink for ink-jet recording and ink container

A water-based ink set for ink-jet recording includes: a water-based yellow ink containing water and a yellow dye having a blending amount in an entire amount of the water-based yellow ink of 2 to 3% by weight, the water-based yellow ink having a hue angle of 45&#xb0; to 65&#xb0;; a water-based magenta ink containing water and a magenta dye having a blending amount in an entire amount of the water-based magenta ink of 2 to 3% by weight, the water-based magenta ink having a hue angle of 340&#xb0; to 360&#xb0; or 0&#xb0; to 5&#xb0;; a water-based cyan ink containing water and a cyan dye having a blending amount in an entire amount of the water-based cyan ink of 2 to 3% by weight, the water-based cyan ink having a hue angle of 200&#xb0; to 230&#xb0;; and a water-based black ink containing water and a black dye having a blending amount in an entire amount of the water-based black ink of 6 to 7.5% by weight.

Water-based ink set for ink-jet recording and ink-jet recording apparatus

There is provided a water-based ink for ink-jet recording including: water; a self dispersible black pigment of which mean particle diameter is not less than 140 nm; and a resin-dispersed pigment which is a copper phthalocyanine-based pigment and of which sedimentation velocity in the water-based ink is slower than sedimentation velocity of the self-dispersible black pigment in the water-based ink.

A water-based ink set for ink-jet recording includes: a water-based yellow ink containing a yellow pigment, a resin dispersant, and water; a water-based magenta ink containing a magenta pigment, a resin dispersant, and water; a water-based cyan ink containing a cyan pigment, a resin dispersant, and water; and a water-based black ink containing self-dispersible carbon black and water. At least one water-based color ink selected from the group consisting of the water-based yellow ink, the water-based magenta ink, and the water-based cyan ink further contains a dye. The self-dispersible carbon black has an average particle size of 120 to 170 nm.

Water-based ink set for ink-jet printing

A water-based ink for ink-jet recording includes a colorant, water, a surfactant, and a compound represented by the following formula (1).  In the formula (1), R is an alkyl ether group or an alkyl ester group in which a number of carbon atoms of a main chain is not less than 6, and each of an alkyl group of the alkyl ether group and an alkyl group of the alkyl ester group is in a straight chain form or a branched chain form.

Water-based ink for ink-jet recording and ink cartridge

There is provided a water-based ink for ink jet-recording containing a pigment; a surfactant; and water, wherein a slope value of the water-based ink at an evaporation rate of 0% is not more than 15%/hour; and a slope value of the water-based ink at an evaporation rate of 30% is not less than 9%/hour, the slope value of the water-based ink being measured by a centrifugal transmission sedimentation method.

Water-based ink for ink-jet recording and method for evaluating water-based ink for ink-jet recording

A water-based ink for ink-jet recording includes: a colorant containing a self-dispersible pigment; water; and fumed silica. The blending ratio of the fumed silica to the self-dispersible pigment may be not less than 0.2 and not more than 1 by weight. Using the self-dispersible pigment and the fumed silica in combination can satisfy improved optical density and an excellent discharge property.

There is provided a water-based ink set for ink-jet recording, including: a water-based yellow ink which contains water, a water-soluble organic solvent and a yellow colorant containing a yellow dye (Y-1) and a yellow dye (Y-2) indicated below; a water-based magenta ink which contains water, a water-soluble organic solvent and a magenta colorant containing a magenta dye (M-1) and a magenta dye (M-2) indicated below; a water-based cyan ink which contains water, a water-soluble organic solvent and a cyan colorant containing a cyan dye (C-1) indicated below; and a water-based black ink which contains water, a water-soluble organic solvent and a black colorant containing carbon black. 

Growing community of inventors

Nagoya, Japan

Yuka Tsuzaka