Brother Kogyo Kabushiki-kaisha

Pitney Bowes Inc.

Akihiko Taniguchi

Shunichi Higashiyama

Masaya Fujioka

Kazuma Goto

Hideo Ohira

Masashi Tsuda

Noriatsu Aoi

Narumi Koga

Ryuji Kato

Satoshi Okuda

Noriaki Satoh

Michiko Aoyama

Junichiro Sugimoto

Ayako Ohishi

Hiromitsu Sago

Judith D Auslander

Mitsunori Maeda

Richard A Bernard

Masahito Kato

Hiroyuki Tanaka

Yoshito Toyoda

Yuka Tsuzaka

Takefumi Kawakami

Hirotake Nakamura

Yoichiro Shimizu

Koichiro Hara

Takahiro Norimatsu

A water-based ink for ink-jet recording includes: a first resin-dispersed pigment, a second resin-dispersed pigment, and water, wherein the following conditions (1) and (2) are satisfied,1&#x2265;1.2&#x2003;&#x2003;Condition (1):2&#x3c;1.2&#x2003;&#x2003;Condition (2): D1: an average particle size (nm) of the first resin-dispersed pigment after being mixed with an aqueous solution of calcium ions; D1: an average particle size (nm) of the first resin-dispersed pigment after being mixed with pure water; D2: an average particle size (nm) of the second resin-dispersed pigment after being mixed with an aqueous solution of calcium ions; D2: an average particle size (nm) of the second resin-dispersed pigment after being mixed with pure water.

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

There is provided a water-based ink for ink-jet recording including: a self-dispersible black pigment; a resin-dispersed chromatic pigment including a resin-dispersed magenta pigment and a resin-dispersed cyan pigment; and water. A ratio (Col/Bk) of a solid content mass (Col) of the resin-dispersed chromatic pigment to a solid content mass (Bk) of the self-dispersible black pigment is in a range of 0.24 to 0.73 and a mean particle diameter of the self-dispersible black pigment is greater than a mean particle diameter of the resin-dispersed chromatic pigment.

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

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 liquid discharge recording apparatus includes: a liquid containing first glycol ether; a liquid discharge head which discharges the liquid; an absorber which absorbs the liquid discharged from the liquid discharge head; and second glycol ether which is contained in the absorber and of which vapor pressure is lower than that of the first glycol ether.

Liquid discharge recording apparatus and method for recovering liquid

A liquid discharge recording apparatus includes: a liquid; a liquid discharge head configured to discharge the liquid; an absorber configured to absorb the liquid discharged from the liquid discharge head; and unsaturated fatty acid of which specific gravity is smaller than that of the liquid and which is contained in the absorber.

A liquid discharge recording apparatus includes: a first liquid containing 2-pyrrolidone; a liquid discharge head configured to discharge the first liquid; a second liquid containing a solvent of which freezing point is less than 20 degrees Celsius and of which specific gravity is less than 1.12 g/cm; and an absorber which contains the second liquid and which is configured to absorb the first liquid exited from the liquid discharge head.

A liquid discharge recording apparatus includes a first liquid containing first 1,2-alkanediol; a liquid discharge head configured to discharge the first liquid; a second liquid containing second 1,2-alkanediol of which vapor pressure is lower than that of the first 1,2-alkanediol; and an absorber which contains the second liquid and which is configured to absorb the first liquid exited from the liquid discharge head.

An ink set containing a water-based ink for ink jet recording and a treatment liquid. The water-based ink contains a phosphate group-modified self-dispersing pigment, water, and a water-soluble organic solvent. The treatment liquid contains a monovalent metal ion, water, and a water-soluble organic solvent.

Ink set, ink-jet recording apparatus, and ink-jet recording method

An ink set containing a water-based ink for ink jet recording and a treatment liquid. The water-based ink contains a phosphate-group modified self-dispersing pigment, water, and a water-soluble organic solvent. The treatment liquid contains an aggregating agent, water, and a water-soluble organic solvent. A dynamic surface tension of the water-based ink, measured under the condition where a life time is about 50 ms, is in the range of 35 mN/m to 45 mN/m. A dynamic surface tension of the treatment liquid, measured under the condition where a life time is about 50 ms, is in the range of 33 mN/m to 45 mN/m.

Ink set and ink-jet recording method

A water-based ink for ink jet recording, containing: a coloring agent; water; and a water-soluble organic solvent. The coloring agent contains a phosphate group-modified self-dispersing pigment. The water-based ink further contains at least one of a reducing sugar and a sugar alcohol and a calcium ion.

Water-based ink for ink jet recording

A water-based ink for inkjet recording exhibits a blue color defined as L*&#x3c;45, 25&#x3c;C*&#x3c;28, 255&#x3c;h&#x3c;278, and comprises a mixture of dyes and pigments, glycerol and polyethylene glycol #200 as water-soluble organic solvents and a polymeric dispersant. The ink will preferably have a ratio of glycerol to polyethylene glycol 200 within the range of from 2:1 to 3.5 1. The water-based ink preferably includes C.I. Pigment Blue 60 as a colorant and provides good printing stability and good storage stability. Tests show the inks to have good jettability.

Postal blue ink with high reliability

A water-based ink for ink jet recording, containing: a coloring agent; water; and a water-soluble organic solvent. The coloring agent contains a phosphate group-modified self-dispersing pigment. The water-based ink further contains at least one selected from the group consisting of boric acid, diglycolic acid, and a chelating agent.

An ink set for ink-jet recording includes a plurality of color inks, wherein the following formulae (a) to (d) are satisfied.Light OD reduction rate (%)=[()/]&#xd7;100&#x2003;&#x2003;(a)Ozone OD reduction rate (%)=[()/]&#xd7;100&#x2003;&#x2003;(b)Total OD reduction rate (%)=&#x3c;about 40%&#x2003;&#x2003;(c)max&#x2212;min&#x3c;about 15%&#x2003;&#x2003;(d)'A' and 'B' are OD values before and after a light fastness test for a first single-color patch, respectively, and &#x201c;c&#x201d; and &#x201c;D&#x201d; are OD values before and after an ozone resistance test for a second single-color patch, respectively. &#x201c;Zmax&#x201d; and &#x201c;Zmin&#x201d; are a maximum and a minimum of all the total OD reduction rates (Z), respectively.

Ink set for ink-jet recording

A water-based ink includes a dye (1) represented by the general formula (1); a dye (2) at least one dye selected from the group consisting of a dye having free acid that is represented by the general formula (2-1), C. I. Acid Red 52 and 289; DPP; and a surfactant represented by the general formula (3). The dyes, DPP, and the surfactant are blended so as to satisfy the conditions (A) to (D). 

Growing community of inventors

Kakamigahara, Japan

Akihiko Taniguchi