US6648954B2 — Water-based pigment dispersion, use thereof and p…

Claim 1

Independent Claim 164 words

A water-based pigment dispersion comprising 100 parts by weight of a fused polycyclic pigment, 3 to 30 parts by weight of a sulfonic acid group-containing pigment derivative and water, wherein the sulfonic acid group-containing pigment derivative has only one sulfonic acid group in a molecule of a pigment of which the type is the same as the type of the pigment to be dispersed, the sulfonic acid group forms at least one salt selected from the group consisting of ammonia salt, an organic amine salt and a salt in which at least 15% of the sulfonic acid group is liberated and the rest is a salt with monovalent metal, the content of metal ion having a valence of at least 2 in a solid matter of the above water-based pigment dispersion is 500 ppm or less, and the above pigment is dispersed in water according to electrostatic repulsion due to the sulfonic acid group-containing pigment derivative adsorbed on the particle surface of the pigment.

Claim 2

Dependent Claim 164 words

A water-based pigment dispersion comprising 100 parts by weight of a fused polycyclic pigment, 3 to 30 parts by weight of a sulfonic acid group-containing pigment derivative and water, wherein the sulfonic acid group-containing pigment derivative has only one sulfonic acid group in a molecule of a pigment of which the type is the same as the type of the pigment to be dispersed, the sulfonic acid group forms at least one salt selected from the group consisting of ammonia salt, an organic amine salt and a salt in which at least 15% of the sulfonic acid group is liberated and the rest is a salt with monovalent metal, the content of metal ion having a valence of at least 2 in a solid matter of the above water-based pigment dispersion is 500 ppm or less, and the above pigment is dispersed in water according to electrostatic repulsion due to the sulfonic acid group-containing pigment derivative adsorbed on the particle surface of the pigment.

Claim 3

Dependent Claim 37 words

A water-based pigment dispersion according to claim 1 , wherein the total amount of a chloride ion content and a sulfuric acid ion content in the solid matter in the water-based dispersion is 100 ppm or less.

Claim 4

Dependent Claim 75 words

A water-based pigment dispersion according to claim 1 , wherein the sulfonic acid group-containing pigment derivative includes a pigment derivative having only one sulfonic acid group in a molecule in an amount of at least 60% by weight and a pigment derivative having at least two sulfonic acid groups in a molecule in an amount of 20% by weight or less based on the pigment to which a sulfonic acid group is to be introduced.

Claim 5

Dependent Claim 21 words

A water-based pigment dispersion according to claim 1 , wherein the sulfonic acid group-containing pigment derivative is a directly sulfonated pigment.

Claim 6

Dependent Claim 16 words

A water-based pigment dispersion according to claim 1 , wherein the pigment is a benzimidazolone pigment.

Claim 7

Dependent Claim 23 words

A water-based pigment dispersion according to claim 1 , wherein the pigment has an average primary particle diameter of 150 nm or less.

Claim 8

Dependent Claim 25 words

A water-based pigment dispersion according to claim 1 , wherein the pigment has a dispersed particle diameter of 50 nm<D50<150 nm and 150 nm<D99<400 nm.

Claim 9

Dependent Claim 29 words

A water-based pigment dispersion according to any one of claims 1 to 5 , 6 and 7 , wherein the particles of the pigment have a negative zeta potential.

Claim 10

Dependent Claim 21 words

A water-based pigment dispersion according to claim 1 , wherein the water-based pigment dispersion has a pH of 7 to 10.

Claim 11

Dependent Claim 25 words

A water-based pigment dispersion according to claim 1 , wherein the water-based pigment dispersion has a conductivity of 600 μS/cm or less at 25° C.

Claim 12

Dependent Claim 26 words

A water-based pigment dispersion according to claim 1 , wherein the water-based pigment dispersion has a surface tension of at least 60 mN/m at 25° C.

Claim 13

Dependent Claim 25 words

A water-based pigment dispersion according to claim 1 , wherein the water-based pigment dispersion has a viscosity of 4.0 mPa·s or less at 25° C.

Claim 14

Dependent Claim 169 words

An inkjet recording liquid containing the water-based pigment dispersion comprising 100 parts by weight of a fused polycyclic pigment, 3 to 30 parts by weight of a sulfonic acid group-containing pigment derivative and water, wherein the sulfonic acid group-containing pigment derivative has only one sulfonic acid group in a molecule of a pigment of which the type is the same as the type of the pigment to be dispersed, the sulfonic acid group forms at least one salt selected from the group consisting of ammonia salt, an organic amine salt and a salt in which at least 15% of the sulfonic acid group is liberated and the rest is a salt with monovalent metal, the content of metal ion having a valence of at least 2 in a solid matter of the above water-based pigment dispersion is 500 ppm or less, and the above pigment is dispersed in water according to electrostatic repulsion due to the sulfonic acid group-containing pigment derivative adsorbed on the particle surface of the pigment.

Claim 15

Dependent Claim 169 words

An inkjet recording liquid containing the water-based pigment dispersion comprising 100 parts by weight of a fused polycyclic pigment, 3 to 30 parts by weight of a sulfonic acid group-containing pigment derivative and water, wherein the sulfonic acid group-containing pigment derivative has only one sulfonic acid group in a molecule of a pigment of which the type is the same as the type of the pigment to be dispersed, the sulfonic acid group forms at least one salt selected from the group consisting of ammonia salt, an organic amine salt and a salt in which at least 15% of the sulfonic acid group is liberated and the rest is a salt with monovalent metal, the content of metal ion having a valence of at least 2 in a solid matter of the above water-based pigment dispersion is 500 ppm or less, and the above pigment is dispersed in water according to electrostatic repulsion due to the sulfonic acid group-containing pigment derivative adsorbed on the particle surface of the pigment.

Claim 16

Dependent Claim 101 words

A process for the production of a water-based pigment dispersion, comprising a step of introducing at least one sulfonic acid group into a molecule by sulfonating a pigment, a step of obtaining a sulfonic acid group-containing pigment derivative having only one sulfonic acid group by removing a pigment derivative having at least two sulfonic acid groups from a reaction product, and a step of dispersing the sulfonic acid group-containing pigment derivative obtained in the above step and a fused polycyclic pigment having the same type pigment molecule structure as the structure of the above sulfonic acid group-containing pigment derivative in water.

Claim 17

Dependent Claim 101 words

A process for the production of a water-based pigment dispersion, comprising a step of introducing at least one sulfonic acid group into a molecule by sulfonating a pigment, a step of obtaining a sulfonic acid group-containing pigment derivative having only one sulfonic acid group by removing a pigment derivative having at least two sulfonic acid groups from a reaction product, and a step of dispersing the sulfonic acid group-containing pigment derivative obtained in the above step and a fused polycyclic pigment having the same type pigment molecule structure as the structure of the above sulfonic acid group-containing pigment derivative in water.

Claim 18

Dependent Claim 33 words

A process according to claim 14 , wherein the step of removing the pigment derivative having at least two sulfonic acid groups from the reaction product is carried out by an ultrafiltration method.

Claim 19

Dependent Claim 25 words

A process according to claim 14 , wherein the water-based pigment dispersion is dispersed in water containing monovalent metal ion, ammonia or an organic amine.

Claim 20

Dependent Claim 44 words

A process according to claim 14 , wherein at least 15% of the sulfonic acid group-containing pigment derivative is present in a liberated state in the water-based pigment dispersion when the sulfonic acid group-containing pigment derivative forms a salt of a monovalent metal ion.

Claim 21

Dependent Claim 34 words

A process according to claim 14 , wherein the content of metal ion having a valence of at least 2 in a solid content of the water-based pigment dispersion is 500 ppm or less.

Claim 22

Dependent Claim 21 words

A process according to claim 14 , wherein the pigment has an average primary particle diameter of 150 nm or less.

Claim 23

Dependent Claim 23 words

A process according to claim 14 , wherein the pigment has a dispersed particle diameter of 50 nm<D50<150 nm and 150 nm<D99<400 nm.

Claim 24

Dependent Claim 73 words

A process according to claim 14 , wherein the sulfonic acid group-containing pigment derivative includes a pigment derivative having only one sulfonic acid group in a molecule in an amount of at least 60% by weight and a pigment derivative having at least two sulfonic acid groups in a molecule in an amount of 20% by weight or less based on the pigment to which a sulfonic acid group is to be introduced.

Annuity Stage	Window Opens	Payment Deadline	Surcharge Period Until	Estimated Fee	Status
3.5 Years (Year 4)	2006-11-17	2007-05-19	2007-11-18	$2000.00	Window Closed / Lapsed
7.5 Years (Year 8)	2010-11-17	2011-05-19	2011-11-18	$3760.00	Window Closed / Lapsed
11.5 Years (Year 12)	2014-11-17	2015-05-19	2015-11-18	$7700.00	Window Closed / Lapsed

Water-based pigment dispersion, use thereof and process for the production thereof

Abstract

Inventors

Bibliographic Details

Claims Analysis

References Cited (Backward Citations)

USPTO Annuity & Maintenance Windows

Assigned Categories & Tags

Assign Category Tag