White ink composition for ink-jet printing
First Claim
Patent Images
1. A white ink composition for ink-jet printing, which consists essentially of 4.5 to 40% by weight of inorganic white pigment having a particle size of less than 3 μ
- m on the basis of the ink composition;
a binder resin selected from the group consisting of a rosin-modified maleic acid resin, a xylene resin, a rosin-modified xylene resin, an ester gum, a ketone resin, a nitrocellulose, a novolak phenol resin, a resole phenol resin, a rosin-modified phenol resin, an alkylphenol resin, a terpene-modified phenol resin, a glycerine ester of rosin, a polyethyleneglycol ester of rosin, and a hydrogenated rosin or an ester thereof in an amount of 0.1 to 5 parts by weight per part by weight of the inorganic white pigment;
55 to 90% by weight of a solvent capable of dissolving said binder resin selected from the group consisting of an alcohol, a ketone, an ether, an acetate ester and cyclohexanone on the basis of the ink composition; and
0.25 to 5% by weight of a specific resistance-controlling agent capable of adjusting the specific resistance of the composition to less than 2,000 Ω
.cm on the basis of the ink composition, said specific resistance-controlling agent being selected from the group consisting of an alkali metal halide;
an ammonium halide;
a thiocyanate of an alkali metal, an alkaline earth metal or ammonium; and
a nitrate of an alkali metal, an alkaline earth metal or ammonium.
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Abstract
A dark or black print article is ink-jet printed with a white ink composition comprising at least a white pigment having a particle size of less than 3 μm, a solvent and a binder resin with a good print stability. The white ink composition has a good dispersion stability, a good redispersability, and no nozzle clogging.
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Citations
33 Claims
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1. A white ink composition for ink-jet printing, which consists essentially of 4.5 to 40% by weight of inorganic white pigment having a particle size of less than 3 μ
- m on the basis of the ink composition;
a binder resin selected from the group consisting of a rosin-modified maleic acid resin, a xylene resin, a rosin-modified xylene resin, an ester gum, a ketone resin, a nitrocellulose, a novolak phenol resin, a resole phenol resin, a rosin-modified phenol resin, an alkylphenol resin, a terpene-modified phenol resin, a glycerine ester of rosin, a polyethyleneglycol ester of rosin, and a hydrogenated rosin or an ester thereof in an amount of 0.1 to 5 parts by weight per part by weight of the inorganic white pigment;
55 to 90% by weight of a solvent capable of dissolving said binder resin selected from the group consisting of an alcohol, a ketone, an ether, an acetate ester and cyclohexanone on the basis of the ink composition; and
0.25 to 5% by weight of a specific resistance-controlling agent capable of adjusting the specific resistance of the composition to less than 2,000 Ω
.cm on the basis of the ink composition, said specific resistance-controlling agent being selected from the group consisting of an alkali metal halide;
an ammonium halide;
a thiocyanate of an alkali metal, an alkaline earth metal or ammonium; and
a nitrate of an alkali metal, an alkaline earth metal or ammonium. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 28, 32)
- m on the basis of the ink composition;
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12. A white ink composition for ink-jet printing, which comprises 4.5 to 40% by weight of inorganic white pigment having a particle size of less than 3 μ
- m on the basis of the ink composition;
a binder resin selected from the group consisting of a rosin-modified maleic acid resin, a xylene resin, a rosin-modified xylene resin, an ester gum, a ketone resin, a nitrocellulose, a novolak phenol resin, a resole phenol resin, a rosin modified phenol resin, an alkylphenol resin, a terpene-modified phenol resin, a glycerine ester of rosin, a polyethyleneglycol ester of rosin, and a hydrogenated rosin or an ester thereof in an amount of 0.1 to 5 parts by weight per part by weight of the inorganic white pigment;
55 to 90% by weight of a solvent capable of dissolving said binder resin selected from the group consisting of an alcohol, a ketone, an ether, an acetate ester and cyclohexanone on the basis of the ink composition; and
0.25 to 5% by weight of a specific resistance-controlling agent capable of adjusting the specific resistance of the composition to less than 2,000 Ω
.cm on the basis of the ink composition, said specific resistance-controlling agent being selected from the group consisting of an alkali metal halide;
an ammonium halide;
a thiocyanate of an alkali metal, an alkaline earth metal or ammonium; and
a nitrate of an alkali metal, an alkaline earth metal or ammonium;
wherein said white ink composition is non-aqueous. - View Dependent Claims (16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 30)
- m on the basis of the ink composition;
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13. A method for ink-jet printing, which comprises injecting a white ink composition which consists essentially of 4.5 to 40% by weight of inorganic white pigment having a particle size of less than 3 μ
- m on the basis of the ink composition;
a binder resin selected from the group consisting of a rosin-modified maleic acid resin, a xylene resin, a rosin-modified xylene resin, an ester gum, a ketone resin, a nitrocellulose, a novolak phenol resin, a resole phenol resin, a rosin modified phenol resin, an alkylphenol resin, a terpene-modified phenol resin, a glycerine ester of rosin, a polyethyleneglycol ester of rosin, and a hydrogenated rosin or an ester thereof in an amount of 0.1 to 5 parts by weight per part by weight of the inorganic white pigment;
55 to 90% by weight of a solvent capable of dissolving said binder resin selected from the group consisting of an alcohol, a ketone, an ether, an acetate ester and cyclohexanone on the basis of the ink composition; and
0.25 to 5% by weight of a specific resistance-controlling agent capable of adjusting the specific resistance of the composition to less than 2,000 Ω
.cm on the basis of the ink composition, said specific resistance-controlling agent being selected from the group consisting of an alkali metal halide;
an ammonium halide;
a thiocyanate of an alkali metal, an alkaline earth metal or ammonium; and
a nitrate of an alkali metal, an alkaline earth metal or ammonium, from a nozzle in the form of fine particles, and forming a print of desired pattern on a print article white deflecting the fine particles as desired by deviation electrodes controlled by an electrical signal. - View Dependent Claims (15, 29, 33)
- m on the basis of the ink composition;
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14. A method for ink-jet printing, which comprises injecting a white ink composition comprising 4.5 to 40% by weight of inorganic white pigment having a particle size of less than 3 μ
- m on the basis of the ink composition;
a binder resin selected from the group consisting of a rosin-modified maleic acid resin, a xylene resin, a rosin-modified xylene resin, an ester gum, a ketone resin, a nitrocellulose, a novalak phenol resin, a resole phenol resin, a rosin-modified phenol resin, an alkylphenol resin, a terpene-modified phenol resin, a glycerine ester of rosin, a polyethyleneglycol ester of rosin, and a hydrogenated rosin or an ester thereof in an amount of 0.1 to 5 parts by weight per part by weight of the inorganic white pigment;
55 to 90% by weight of a solvent capable of dissolving said binder resin selected from the group consisting of an alcohol, a ketone, an ether, an acetate ester and cyclohexanone on the basis of the ink composition; and
0.25 to 5% by weight of a specific resistance-controlling agent capable of adjusting the specific resistance of the composition to less than 2,000 Ω
.cm on the basis of the ink composition, said specific resistance-controlling agent being selected from the group consisting of an alkali metal halide;
an ammonium halide;
a thiocyanate of an alkali metal, an alkaline earth metal or ammonium; and
a nitrate of an alkali metal, an alkaline earth metal or ammonium, from a nozzle in the form of fine particles, electrically charging the fine particles and forming a print of desired pattern on a print article while deflecting the fine particles as desired by deviation electrodes controlled by an electrical letter signal;
wherein said white ink composition is non-aqueous. - View Dependent Claims (27, 31)
- m on the basis of the ink composition;
Specification