White ink composition for ink-jet printing

Claim 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 μm 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.

Claim 15

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 μm 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.

Claim 16

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 μm 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.

Claim 17

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 μm 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.

Claim 18

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 μm 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.