Methods of inkjet printing
First Claim
1. A method of inkjet printing, comprising:
- providing a substrate;
inkjet printing an aqueous inkjet ink composition from a printhead in a controlled manner onto a surface of the substrate to provide an inkjet printed image on the surface of the substrate,wherein the aqueous inkjet ink composition has a dynamic viscosity of less than or equal to 5 centipoise (5 mPa-sec) at 25°
C., and consists essentially of;
(a) one or more polymer-dispersed pigment colorants in a total amount of at least 0.9 weight % and up to and including 6 weight %, based on the total weight of the aqueous inkjet ink composition;
(b) a composition consisting of one or more compounds represented by the following Structure (I);
HO—
CH2—
CH2—
R
(I)wherein R is a substituted or unsubstituted phenyl group or a substituted or unsubstituted phenoxy group, in a total amount of at least 0.5 weight % and up to and including 2 weight %, based on the total weight of the aqueous inkjet ink composition; and
(c) one or more compounds selected from water-soluble humectants, co-solvents, and a combination of water-soluble humectants and co-solvents, in an amount of less than or equal to 20 weight %, based on the total weight of the aqueous inkjet ink composition,wherein each of the one or more polymer-dispersed pigment colorants has a 50th percentile particle diameter of less than 70 nm and a 95th percentile particle diameter of less than 150 nm, all particle diameters being measured using a dynamic light scattering particle size analyzer.
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Abstract
Substrates can be inkjet printed using an aqueous inkjet ink composition having a dynamic viscosity of 5 centipoise (5 mPa-sec) or less at 25° C., and consisting essentially of: (a) a polymer-dispersed pigment colorant at 0.9-6 weight %; (b) a composition consisting of one or more compounds represented by the following Structure (I):
HO—CH2—CH2—R (I)
wherein R is a substituted or unsubstituted phenyl group or a substituted or unsubstituted phenoxy group, at 0.5-2 weight %; and (c) a water-soluble humectant, co-solvents, or both, at 20 weight %. Each polymer-dispersed pigment colorant has a 50th percentile particle diameter of less than 70 nm and a 95th percentile particle diameter of less than 150 nm, measured using a dynamic light scattering particle size analyzer. Replenishment or maintenance fluids containing a Structure (I) compound can also be used during the inkjet printing process.
20 Citations
20 Claims
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1. A method of inkjet printing, comprising:
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providing a substrate; inkjet printing an aqueous inkjet ink composition from a printhead in a controlled manner onto a surface of the substrate to provide an inkjet printed image on the surface of the substrate, wherein the aqueous inkjet ink composition has a dynamic viscosity of less than or equal to 5 centipoise (5 mPa-sec) at 25°
C., and consists essentially of;(a) one or more polymer-dispersed pigment colorants in a total amount of at least 0.9 weight % and up to and including 6 weight %, based on the total weight of the aqueous inkjet ink composition; (b) a composition consisting of one or more compounds represented by the following Structure (I);
HO—
CH2—
CH2—
R
(I)wherein R is a substituted or unsubstituted phenyl group or a substituted or unsubstituted phenoxy group, in a total amount of at least 0.5 weight % and up to and including 2 weight %, based on the total weight of the aqueous inkjet ink composition; and (c) one or more compounds selected from water-soluble humectants, co-solvents, and a combination of water-soluble humectants and co-solvents, in an amount of less than or equal to 20 weight %, based on the total weight of the aqueous inkjet ink composition, wherein each of the one or more polymer-dispersed pigment colorants has a 50th percentile particle diameter of less than 70 nm and a 95th percentile particle diameter of less than 150 nm, all particle diameters being measured using a dynamic light scattering particle size analyzer. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18)
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19. A method of printing an image using a continuous inkjet printer system, the method comprising:
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providing a substrate; providing a jetting module having a plurality of nozzles including a nozzle in fluid communication with a main fluid supply containing an aqueous inkjet ink composition; causing drops of the aqueous inkjet ink composition to be formed while it is jetted through the nozzle in fluid communication with the main fluid supply by drop stimulation in response to time-varying electrical signals; providing a catcher including a drop contact face; using a deflection mechanism to deflect at least some of the drops of the aqueous inkjet ink composition onto the drop contact face of the catcher while allowing other drops of the aqueous inkjet ink composition to pass by the catcher and to be deposited onto a surface of the substrate; and causing the drops of the aqueous inkjet ink composition that contact the drop contact face to flow along the drop contact face, wherein the aqueous inkjet ink composition has a dynamic viscosity of less than or equal to 5 centipoise (5 mPa-sec) at 25°
C. as measured using a rolling ball viscometer, and consists essentially of;(a) one or more polymer-dispersed pigment colorants in a total amount of at least 0.9 weight % and up to and including 6 weight %, based on the total weight of the aqueous inkjet ink composition; (b) a composition consisting of one or more compounds represented by the following Structure (I);
HO—
CH2—
CH2—
R
(I)wherein R is a substituted or unsubstituted phenyl group or a substituted or unsubstituted phenoxy group, in a total amount of at least 0.5 weight % and up to and including 2 weight %, based on the total weight of the aqueous inkjet ink composition; and (c) one or more compounds selected from water-soluble humectants, co-solvents, and a combination of water-soluble humectants and co-solvents, in an amount of less than or equal to 20 weight %, based on the total weight of the aqueous inkjet ink composition, wherein each of the one or more polymer-dispersed pigment colorants has a 50th percentile particle diameter of less than 70 nm and a 95th percentile particle diameter of less than 150 nm, all particle diameters being measured using a dynamic light scattering particle size analyzer.
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20. A method of continuous inkjet printing, comprising:
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supplying a main fluid supply of a continuous inkjet printer with an aqueous inkjet ink composition having a dynamic viscosity of less than or equal to 5 centipoise (5 mPa-sec) at 25°
C., and consisting essentially of;(a) one or more polymer-dispersed pigment colorants in a total amount of at least 0.9 weight % and up to and including 6 weight %, based on the total weight of the aqueous inkjet ink composition; (b) a composition consisting of one or more compounds represented by the following Structure (I);
HO—
CH2—
CH2—
R
(I)wherein R is a substituted or unsubstituted phenyl group or a substituted or unsubstituted phenoxy group, in a total amount of at least 0.5 weight % and up to and including 2 weight %, based on the total weight of the aqueous inkjet ink composition; and (c) one or more compounds selected from water-soluble humectants, co-solvents, and a combination of water-soluble humectants and co-solvents, in an amount of less than or equal to 20 weight %, based on the total weight of the aqueous inkjet ink composition, wherein each of the one or more polymer-dispersed pigment colorants has a 50th percentile particle diameter of less than 70 nm and a 95th percentile particle diameter of less than 150 nm, all particle diameters being measured using a dynamic light scattering particle size analyzer; ejecting a continuous stream of drops of the first aqueous inkjet ink composition from a drop generator mechanism; in response to electrical signals received from a control mechanism, selecting between printing drops for imaging a substrate and nonprinting drops that are collected and returned to the main fluid supply, both types of drops from the aqueous inkjet ink composition; and replenishing the main fluid supply as a function of resistivity of the aqueous inkjet ink composition in the main fluid supply, with an aqueous particle-free fluid comprising the (b) composition.
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Specification