US5716435A — Recording fluid for ink-jet printing and process …

Claim 1

Independent Claim 139 words

A water-dispersed inkjet recording liquid containing, as a colorant, a water-based dispersion of an organic pigment (A) having an average particle diameter of 10 to 150 nm measured by laser scattering, the water-based dispersion of the organic pigment (A) being obtained by mechanically kneading a mixture containing at least the following components, the organic pigment (A), a water-soluble inorganic salt (B) in an amount by weight at least three times as large as the amount of the organic pigment (A), a water-soluble solvent (C) and a resin (E) selected from the group consisting of a rosin, an epoxy resin, a (meth)acrylic resin, a rosin-modified maleic acid resin and a rosin-modified phenolic resin, to finely mill the organic pigment (A), and then removing the water-soluble inorganic salt (B) and the water-soluble solvent (C) by washing the kneaded mixture with water.

Claim 2

Dependent Claim 139 words

A water-dispersed inkjet recording liquid containing, as a colorant, a water-based dispersion of an organic pigment (A) having an average particle diameter of 10 to 150 nm measured by laser scattering, the water-based dispersion of the organic pigment (A) being obtained by mechanically kneading a mixture containing at least the following components, the organic pigment (A), a water-soluble inorganic salt (B) in an amount by weight at least three times as large as the amount of the organic pigment (A), a water-soluble solvent (C) and a resin (E) selected from the group consisting of a rosin, an epoxy resin, a (meth)acrylic resin, a rosin-modified maleic acid resin and a rosin-modified phenolic resin, to finely mill the organic pigment (A), and then removing the water-soluble inorganic salt (B) and the water-soluble solvent (C) by washing the kneaded mixture with water.

Claim 3

Dependent Claim 208 words

A water-dispersed inkjet recording liquid according to claim 1, wherein the water-based dispersion of the organic pigment (A) is a product obtained by further adding a pigment derivative of the formula (1), P-- X--Y--Z--N(R.sup.1)R.sup.2 !.sub.n ( 1) wherein P is an organic pigment residue, a heterocyclic ring residue or an aromatic polycyclic compound residue, X is a divalent binding group formed of a chemically rational combination of 2 to 15 atoms selected from the group consisting of S, C, N, O and H, Y is a divalent binding group selected from the group consisting of "(1) a divalent bond, (2) --NR-- in which R is H or an alkyl" group having 1 to 18 carbon atoms, and (3) --O--, Z is an alkylene group having 1 to 6 carbon atoms, either each of R 1 and R 2 is independently an optionally substituted alkyl group having 1 to 18 carbon atoms or R 1 and R 2 form a heterocyclic ring which may have a substituent, and n is an integer of 1 to 3, to the mixture, kneading the mixture to finely mill the organic pigment (A), and then removing the water-soluble inorganic salt (B) and the water-soluble solvent (C) by washing the kneaded mixture with water.

Claim 4

Dependent Claim 40 words

A water-dispersed inkjet recording liquid according to claim 1, wherein the organic pigment (A) is at least one selected from the group consisting of quinacridone organic pigments, phthalocyanine organic pigments, benzimidazolone organic pigments, isoindolinone organic pigments and azo organic pigments.

Claim 5

Dependent Claim 25 words

A water-dispersed inkjet recording liquid according to claim 1, wherein the water-dispersed inkjet recording liquid further contains a water-based resin in addition to the colorant.

Claim 6

Dependent Claim 20 words

A water-dispersed inkjet recording liquid according to claim 4, wherein the water-dispersed inkjet recording liquid further contains a neutralizing agent.

Claim 7

Dependent Claim 26 words

A water-dispersed inkjet recording liquid according to claim 4, wherein the organic pigment (A) is contained in the range of from 0.1 to 10% by weight.

Claim 8

Dependent Claim 29 words

A water-dispersed inkjet recording liquid according to claim 4, wherein the water-dispersed inkjet recording liquid has a viscosity in the range of from 0.8 to 15 centipoise (25° C.).

Claim 9

Dependent Claim 34 words

A water-dispersed inkjet recording liquid according to claim 4, wherein the water-based resin is contained in an amount of 0.5 to 10 parts by weight per 100 parts by weight of the recording liquid.

Claim 10

Dependent Claim 191 words

A process for the production of a water-dispersed inkjet recording liquid, which comprises the following steps a) - d, a) mechanically kneading a mixture containing at least the following components, an organic pigment (A), a water-soluble inorganic salt (B) in an amount by weight at least three times as large as the amount of the organic pigment (A), a water-soluble solvent (C) and a resin (E) selected from the group consisting of a rosin, an epoxy resin, a (meth)acrylic resin, a rosin-modified maleic acid resin and a rosin-modified phenolic resin, to finely mill the organic pigment (A), b) removing the water-soluble inorganic salt (B) and the water-soluble solvent (C) from the mixture of the finely milled organic pigment (A) by washing the mixture with water, to obtain a water-based dispersion of the organic pigment (A) having an average particle diameter of 10 to 150 nm (measured by laser scattering), c) adding and dispersing a water-based resin to/in the water-based dispersion, and d) adding water and an additive to the dispersion to dilute the dispersion and filtering the diluted dispersion through a filter having an opening diameter of 3 μm or less.

Claim 11

Dependent Claim 191 words

A process for the production of a water-dispersed inkjet recording liquid, which comprises the following steps a) - d, a) mechanically kneading a mixture containing at least the following components, an organic pigment (A), a water-soluble inorganic salt (B) in an amount by weight at least three times as large as the amount of the organic pigment (A), a water-soluble solvent (C) and a resin (E) selected from the group consisting of a rosin, an epoxy resin, a (meth)acrylic resin, a rosin-modified maleic acid resin and a rosin-modified phenolic resin, to finely mill the organic pigment (A), b) removing the water-soluble inorganic salt (B) and the water-soluble solvent (C) from the mixture of the finely milled organic pigment (A) by washing the mixture with water, to obtain a water-based dispersion of the organic pigment (A) having an average particle diameter of 10 to 150 nm (measured by laser scattering), c) adding and dispersing a water-based resin to/in the water-based dispersion, and d) adding water and an additive to the dispersion to dilute the dispersion and filtering the diluted dispersion through a filter having an opening diameter of 3 μm or less.

Claim 12

Dependent Claim 165 words

A process according to claim 9 wherein the mixture in the step a) further contains a pigment derivative of the formula (1), P-- X--Y--Z--N(R.sup.1)R.sup.2 !.sub.n ( 1) wherein P is an organic pigment residue, a heterocyclic ring residue or an aromatic polycyclic compound residue, X is a divalent binding group formed of a chemically rational combination of 2 to 15 atoms selected from the group consisting of S, C, N, O and H, Y is a divalent binding group selected from the group consisting of (1) a direct bond, (2) --NR-- in which R is H or an alkyl group having 1 to 18 carbon atoms, and (3) --O--, Z is an alkylene group having 1 to 6 carbon atoms, either each of R 1 and R 2 is independently an optionally substituted alkyl group having 1 to 18 carbon atoms or R 1 and R 2 form a heterocyclic ring which may have a substituent, and n is an integer of 1 to 3.

Claim 13

Dependent Claim 38 words

A process for the production of a water-dispersed inkjet recording liquid according to claim 9, wherein the water-based resin is dispersed in the water-based dispersion in the step c) by kneading the water-based resin and the water-based dispersion.

Claim 14

Dependent Claim 42 words

A process for the production of a water-dispersed inkjet recording liquid according to claim 9, wherein in the step c), the organic pigment has a concentration of 10 to 40% by weight and the organic pigment and the water-based resin are dispersed.

Claim 15

Dependent Claim 62 words

A process for the production of water-dispersed inkjet recording liquid according to claim 9, wherein the additive in the step d) contains at least one selected from the group consisting of a neutralizing agent for the water-based resin, a dispersing agent, an aqueous solvent for retaining wettability, an antifungal agent, an agent for adjusting penetration, a chelating agent and an antifoaming agent.

Annuity Stage	Window Opens	Payment Deadline	Surcharge Period Until	Estimated Fee	Status
3.5 Years (Year 4)	2001-02-09	2001-08-11	2002-02-10	$2000.00	Window Closed / Lapsed
7.5 Years (Year 8)	2005-02-09	2005-08-11	2006-02-10	$3760.00	Window Closed / Lapsed
11.5 Years (Year 12)	2009-02-09	2009-08-11	2010-02-10	$7700.00	Window Closed / Lapsed

Recording fluid for ink-jet printing and process for the production thereof

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