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Aqueous pigment concentrates, aqueous inkjet inks and uses thereof

A water-based pigment and water-based ink technology, applied in the field of water-based inkjet inks and water-based pigment concentrates, can solve problems such as unstable static surface tension, damage to ink printing machines, and changes in wetting performance, reducing VOC emissions and reducing cost. foam, and the effect of stabilizing filter performance

Pending Publication Date: 2022-07-08
TIGERWERK LACK & FARBENFAB
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

When prior art inkjet inks are set to have low static surface tension (e.g. 25°C When measured at 23-30mN / m), it is observed that the surface tension of the ink gradually increases with time, resulting in changes in the wetting properties of the ink on the substrate and the instability of the ink
Ink instability can cause serious damage to the press, especially the printhead and ink supply system
The reason for the instability of the static surface tension required for ink compositions during storage or continuous recycling is not fully understood, but is believed to be due to modified, especially polyether-modified polysiloxanes in slightly alkaline aqueous solutions caused by poor long-term stability of polyether-modified polysiloxanes, or due to the adsorption of polyether-modified polysiloxanes to the pigment surface, polysiloxanes cannot be used as free surfactants for the required substrate wetting
[0027] On the other hand, prints obtained from aqueous inkjet inks in corrugators have poor abrasion resistance due to the removal of applied prints (e.g. primers, color Inks, clear inks (varnishes), through abrasion), resulting in unacceptable / poor image quality, or even worse, corrugator stoppages due to jamming, so cannot be used for in-line digital printing in corrugators or in corrugated board lines application

Method used

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  • Aqueous pigment concentrates, aqueous inkjet inks and uses thereof
  • Aqueous pigment concentrates, aqueous inkjet inks and uses thereof
  • Aqueous pigment concentrates, aqueous inkjet inks and uses thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0180] Embodiment 1. An aqueous pigment concentrate comprising

[0181] - one or more pigments, wherein the total pigment concentration in the aqueous pigment concentrate is from 5 to 40 wt.%, preferably wherein the one or more pigments comprise organic pigments,

[0182] - one or more pigment dispersants, wherein the total pigment dispersant concentration in the aqueous pigment concentrate is from 0.5 to 5 wt.%,

[0183] - One or more non-ionic surfactants with a hydrophilic-lipophilic balance (HLB) value of at least 12, wherein the total concentration of non-ionic surfactants with an HLB value of at least 12 in the aqueous pigment concentrate is 0.1 to 10wt.%, and

[0184] - water as balance;

[0185] Preferably wherein the ratio of said total nonionic surfactant concentration to said total pigment dispersant concentration is from 0.1 to 5 and / or preferably wherein the sum of said total nonionic surfactant concentration and said total pigment dispersant concentration is th...

Embodiment 2

[0186] Embodiment 2. The aqueous pigment concentrate of Embodiment 1, wherein the one or more pigment dispersants comprise an organic polymer having pigment affinity groups and 3000Da to 70000Da The weight average molecular weight Mw;

[0187] Preferably wherein the pigment affinity groups are acid groups, especially wherein the polymer has an acid number of 5 to 300 mgKOH / g.

Embodiment 3

[0188] Embodiment 3. The aqueous pigment concentrate of embodiment 1 or 2, wherein the one or more pigment dispersants comprise pigment dispersants having a glass transition temperature Tg of 20 to 170°C.

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Abstract

The present invention provides an aqueous pigment concentrate comprising one or more pigments wherein the total pigment concentration in the aqueous pigment concentrate is from 5 to 40 wt.%, one or more pigment dispersants wherein the total pigment dispersant concentration in the aqueous pigment concentrate is from 0.5 to 5 wt.%, and one or more pigment dispersants wherein the total pigment dispersant concentration in the aqueous pigment concentrate is from 0.5 to 5 wt.%. One or more nonionic surfactants having a hydrophilic-lipophilic balance (HLB) value of at least (12) wherein the total concentration of the nonionic surfactants having an HLB value of at least (12) in the aqueous pigment concentrate is 0.1 to 10 wt.%, and as a balance water. Also provided is an aqueous ink comprising the aqueous pigment concentrate, and its use for inkjet printing, preferably on corrugated boards or on liners used to produce corrugated boards.

Description

Technical field [0001] This application relates to the field of inkjet printing. In one aspect of the present application, an aqueous pigment concentrate is provided. In a second aspect of the application there is provided an aqueous inkjet ink comprising a pigment concentrate according to the first aspect. In a third aspect, use of the ink for inkjet printing is provided. Background technique [0002] Corrugated cardboard is produced by bonding at least one corrugated cardboard sheet and one or two flat cardboard sheets. Up to seven paper sheets can be used to produce corrugated board (resulting in so-called triple-layer corrugated board). Corrugated board is generally characterized by the following most critical properties: The lightweight paper acquires extraordinary stability / stiffness when formed into corrugations and bonded together with flat sheets, creating a hollow structure. In this way, stable, lightweight materials made of paper can be produced for various ap...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09D11/322C09D11/326
CPCC09D11/322C09D11/10C09D11/38C09D11/00
Inventor 尤里·格纳秋克克里斯托夫·卢梅茨伯格迪特尔·霍尔茨英格尔
Owner TIGERWERK LACK & FARBENFAB