Inkjet ink and process for the production thereof
First Claim
1. An inkjet ink consisting essentially of an aqueous liquid containing water and a water-soluble solvent, a carbon black pigment and 0.5 to 10% by weight of a water-soluble resin, the water-soluble resin being a terpolymer obtained from acrylic acid, styrene and α
- -methyl styrene and having a weight average molecular weight of 2,000 to 8,000 and an acid value of 90 to 130 and the styrene and the α
-methyl styrene being employed in a total amount of 3 to 5 mole per mole of the acrylic acid, said ink having a resistance value, measured at an inter-electrode distance of 5 mm, of at least 106 Ω
on a set-solid print surface.
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Accused Products
Abstract
An inkjet ink having sufficient water resistance on a recording sheet but having excellent re-solubility in an ink in a head portion and excellent ejection stability through a nozzle, the inkject ink comprising an aqueous liquid, a pigment and a water-soluble resin, the water-soluble resin being a terpolymer obtained from acrylic acid, styrene and α-methyl styrene and having a weight average molecular weight of 2,000 to 8,000 and an acid value of 90 to 130, and a process for the production of the inkjet ink, which comprises preparing a concentrated aqueous dispersion of a pigment and a terpolymer obtained from acrylic acid, styrene and α-methylstyrene, adding water and an additive to the concentrated dispersion to dilute the concentrated dispersion and maintaining the diluted dispersion at a temperature between 60° C. and 80° C. for 5 to 48 hours.
38 Citations
9 Claims
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1. An inkjet ink consisting essentially of an aqueous liquid containing water and a water-soluble solvent, a carbon black pigment and 0.5 to 10% by weight of a water-soluble resin, the water-soluble resin being a terpolymer obtained from acrylic acid, styrene and α
- -methyl styrene and having a weight average molecular weight of 2,000 to 8,000 and an acid value of 90 to 130 and the styrene and the α
-methyl styrene being employed in a total amount of 3 to 5 mole per mole of the acrylic acid, said ink having a resistance value, measured at an inter-electrode distance of 5 mm, of at least 106 Ω
on a set-solid print surface. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
- -methyl styrene and having a weight average molecular weight of 2,000 to 8,000 and an acid value of 90 to 130 and the styrene and the α
Specification