Ink jet recording liquid and ink jet recording method

Details Ink jet recording liquid and ink jet recording method Ink jet recording liquid and ink jet recording method

1999-10-13

2003-09-16

Egwim, Kelechi (Department: 1713)

Compositions: coating or plastic

Coating or plastic compositions

Marking

C524S556000, C524S560000, C524S577000, C427S466000, C427S469000

Reexamination Certificate

active

06620229

ABSTRACT:

BACKGROUND OF THE INVENTION
1. Field of Utilization
The present invention relates to an ink jet recording liquid and an ink jet recording method.
2. Description of the Related Art
Because the so-called ink jet printer in which a liquid or molten solid ink is jetted from a nozzle, slit, or porous film for recording on a paper, cloth, or film is advantageous in that a printer is small in size, inexpensive in price, and quiet in operation, the ink jet printer has been used popularly as the black monochromatic or full color printer. In particular, the so-called piezo ink jet system in which a piezo-electric element is used, and the so-called thermal ink jet system in which liquid droplets are formed by applying thermal energy for recording are advantageous because of high speed printing and high resolution printing.
Though the conventional ink which uses water soluble dye used generally for the ink jet recording system is excellent in long term preservation stability, the ink is disadvantageous in water resistance and light resistance. On the other hand, the ink which uses pigment is excellent in water resistance and light resistance, and also gives high optical density and no bleeding picture quality and very promising, and many proposals have been presented recently and used practically. For example, Japanese Published Unexamined Patent Application No. 56-147871 proposes a recording liquid comprising an aqueous liquid containing pigment, polymer dispersant and non-ionic surfactant. U.S. Pat. No. 5,085,698 Specification and U.S. Pat. No. 5,221,334 Specification propose that AB or BAB block copolymer is used as a dispersant for pigment. Furthermore, U.S. Pat. No. 5,172,133 Specification proposes use of specific pigment, water soluble resin, and solvent.
On the other hand, U.S. Pat. No. 5,571,311 discloses a method in which the substitute containing water dissolving group is introduced to carbon black, Japanese Published Unexamined Patent Application No. 8-81646 discloses a method in which water soluble monomer is polymerized on the surface of carbon black, and Japanese Published Unexamined Patent Application No. 8-3498 discloses a method in which carbon black is subjected to oxidation treatment. Furthermore, Japanese Published Unexamined Patent Application No. 9-194775 discloses a method in which an ink containing oxidized carbon black and ternary copolymer consisting of acrylic acid, styrene, and methylstyrene.
However, it has been known that the pigment ink is generally disadvantageous in rub resistance. Japanese Published Unexamined Patent Application No. 55-65269 discloses a method for improving the rub resistance by adding a surfactant in a ink, if this method is applied to a pigment ink, though the rub resistance is improved, the sufficient image density cannot be obtained and feathering occurs possibly. As described hereinabove, a pigment ink which is excellent in optical density, rub resistance, feathering, and long term preservation stability has not been obtained.
Accordingly, it is the object of the present invention to provide a pigment based ink jet recording liquid which is excellent in optical density, rub resistance, feathering, and long term preservation stability when the ink is used for printing on plain paper, and to provide a recording method in which the ink jet recording liquid described hereinabove is used.
SUMMARY OF THE INVENTION
The inventors of the present invention were engaged in work to solve the above-mentioned problem, and as a result of enthusiastic consideration, found that it was essential to satisfy the conditions described hereunder to obtain an ink jet recording liquid which was excellent in optical density, rub resistance, feathering, and long-term preservation stability, and accomplished the present invention.
In detail, the present invention provides an ink jet recording liquid containing pigment, water soluble organic solvent, and water as the essential components, and additionally containing water soluble resin and/or surfactant, wherein
1) the temporal change rate of dynamic contact angle on a plain paper is in a range from 0.5 to 3.5 degrees/second,
2) the number average particle diameter of dispersed particles in the ink jet recording liquid is in a range from 15 to 100 nm, and
3) the volume average particle diameter of dispersed particles in the ink jet recording liquid is in a range from 30 to 200 nm,
the ink jet recording liquid in which the water soluble resin is a polymer dispersion, and pigment is dispersed by the water soluble resin,
the ink jet recording liquid in which the pigment is water self-dispersible pigment, and the water soluble resin and/or surfactant is anionic or nonionic,
the ink jet recording liquid in which the water soluble resin comprises copolymer having a hydrophilic component and a hydrophobic component.
the ink jet recording liquid in which monomer which constitutes the hydrophilic component of the water soluble resin is one or more monomers selected from a group consisting of acrylic acid, methacrylic acid, and (anhydrous) maleic acid,
the ink jet recording liquid in which monomer which constitutes the hydrophobic component of the water soluble resin is one or more monomers selected from a group consisting of styrene, alkylester of (meth) acrylic acid, and aryl and alkylarylester of (meth) acrylic acid,
the ink jet recording liquid in which HLB of the water soluble resin is in a range from 8.5 to 30.0, and the content of the water soluble resin is 0.1% by weight or higher,
the ink jet recording liquid in which the viscosity of the ink jet recording liquid is in a range from 1.5 to 6.0 mPa·s,
an ink jet recording method for printing the ink jet recording liquid described above by means of ink jet recording, and
the ink jet recording method in which the ink jet recording is thermal ink jet recording.
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS
The preferred embodiments are described in detail hereinafter.
An ink jet recording liquid of the present invention contains pigment, water soluble organic solvent, and water as the essential components, and further contains water soluble resin and/or surfactant.
The pigment used in an ink jet recording liquid of the present invention may be organic pigment or inorganic pigment.
Examples of black pigment include carbon black pigment such as furnace black, lamp black, acetylene black, and channel black. Specified color pigment such as red, green, blue, brown, and white, metallic luster pigment such as gold color pigments and silver color pigment, achromatic or hypochromic extender pigment, and plastic pigments may be used, in addition to black and three primary colors of cyan, magenta, and yellow. Alternatively, newly synthesized pigment for the present invention may be used.
Examples of black pigment include Raven 7000, Raven 5750, Raven 5250, Raven 5000 ULTRAII, Raven 3500, Raven 2000, Raven 1500, Raven 1250, Raven 1200, Raven 1190 ULTRAII, Raven 1170, Raven 1255, Raven 1080, Raven 1060 (these are products of Columbian Carbon Ltd.), Regal 400R, Regal 330R, Regal 660R, Mogul L, Black Pearls L, Monarch 700, Monarch 800, Monarch 880, Monarch 900, Monarch 1000, Monarch 1100, Monarch 1300, Monarch 1400(these are products of Cabot Specialty Chemicals, Inc.), Color Black FW1, Color Black FW2, Color Black FW2V, Color Black 18, Color Black FW200, Color Black S150, Color Black S160, Color Black S170, Printex 35, Printex U, Printex V, Printex 140U, Printer 140V, Special Black 6, Special Black 5, Special Black 4A, Special Black 4 (these are products of Degussa-Huls AG), No. 25, No. 33, No. 40, No. 47, No. 52, No. 900, No. 2300, MCF-88, MA600, MA7, MA8, MA100 (Mitsubishi Chemical Corp.), however the black pigment is by no means limited to these examples.
Though it is difficult to discuss uniformly the structure of preferred carbon black, a carbon black having the particle size of 15 to 30 nm, BET specific surface area of 70 to 300 m
2
/g, DBP oil absorption of 0.5 to 1.0×10
−3
l/g, volatile component of 0.5 to 10% by weight, and ash of 0.01 to 1.0% by weight is

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