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Ink jet ink

a technology of inkjet ink and water, which is applied in the field of aqueous inkjet ink, can solve the problems of insufficient dispersion of pigments for inkjet applications, inability to use non-aqueous ink, and inability to disperse pigments that may be “well dispersed” for other applications, etc., and achieves simple shaking, reduced settling of titanium dioxide particles, and easy re-dispersion and rejuvenation

Inactive Publication Date: 2005-12-22
EI DU PONT DE NEMOURS & CO
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The present invention provides an aqueous inkjet ink that includes a titanium dioxide pigment and a combination of dispersants. The dispersants include a graft copolymer, a block copolymer, and a phosphated acrylic copolymer. The use of these dispersants reduces settling of titanium dioxide particles and allows for soft settling, meaning the pigment can be easily re-dispersed and re-juvenated by low shear mixing. The ink also includes a liquid carrier and optional additives such as other dispersants, humectants, and rheology modifiers. The invention provides an improved method for formulating an aqueous inkjet ink with titanium dioxide pigment.

Problems solved by technology

There are many applications, though, where aqueous ink is typically unsuitable and non-aqueous ink must be used.
Generally, pigments that can be dispersed well in water do not disperse well in non-aqueous solvent, and vice versa.
Thus, pigments that may be “well dispersed” for other applications are often still inadequately dispersed for inkjet applications.
Current white ink formulations are not acceptable for numerous applications, such as commercial inkjet applications, primarily because of poor stability resulting in pigment settling and agglomeration.
Poor stability may result in “nozzle outs” or plugging of the ink jet nozzles.
Poor stability also results in poor hiding, non-uniform coverage and poor clarity in the printed surface.
White ink formulations based on inorganic white pigments, such as titanium dioxide (TiO2), may fail because of poor stabilization of the TiO2 pigment.
Pigment agglomeration and flocculation are often at fault in poor performance of white inks, particularly white inkjet inks, due to settling and nozzle plugging problems.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

examples

[0182] Various abbreviations used in these Examples are listed below.

DPMdipropylene glycol methyl etherDPMAgipropylene glycol methyl ether acetateTPnPtripropylene glycol propyl etherDPnPdipropylene glycol propyl etherTPMtripropylene glycol methyl etherDMEADimethyl ethylaminePNPpropylene glycol n-propyl ethercpscentipoisenBAn-butyl acrylateMAmethyl acrylateAAacrylic acidMAAmethacrylic acidMMAmethyl methacrylateGMAglycidyl methacrylate

Methods

[0183] Titanium dioxide slurries were prepared from titanium dioxide pigments, dispersants, water and optional additives using a Dispermat® High Speed Disperser (HSD), available from VMA-Getzmann GMBH, to premix ingredients followed by media milling using an Eiger minimill, available from Eiger Machinery, Inc. Premixing of all slurry ingredients was performed using a Model AE5—CEX Dispermat operated typically at 2000 rpm with an attached 60 mm Cowels blade. Slurry premix was loaded into a 1-liter stainless steel vessel for media milling.

[0184...

example 4

INK EXAMPLE 4

[0219] Ink Example 4 was prepared by diluting Slurry Ex 6 with water to obtain a titanium dioxide slurry with 15% solids (79.2 grams of water added to 20.8 grams of Slurry Ex 6 to make a 6% solids ink). This diluted slurry was converted into an ink with the following formulation.

TABLE 8Ink Example 4 FormulationSlurry 6 diluted to 15% solids40DPM36.92DPnP24.61PYK0.5pigment solids, (%)6.00Viscosity7.56Surface Tension26.37

[0220] Ink Ex 4 was printed onto a polyvinyl butyral interlayer. The interlayer was used to produce a decorative laminate as described in previously incorporated WO2004018197. The polyvinyl butyral interlayer was printed in a rectangle configuration in multiple passes to test for the % transmission, % haze and % clarity. Each pass was set for printing 100% coverage. After printing, the vinyl butyral interlayer was used to make a decorative laminate. A BKY Gardner Hazegard Plus Instrument was used to measure the % T, % H, and % C. Haze (wide angle scatte...

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Abstract

The present invention pertains to an aqueous inkjet ink made from certain aqueous titanium dioxide slurries, and an associated inkjet ink set for inkjet printing. The invention also pertains to a method of inkjet printing with the ink and ink set. The use of the specific titanium dioxide slurries described herein result in inkjet inks having improved stability and better anti-settling performance with less pigment agglomeration and flocculation over time.

Description

BACKGROUND OF THE INVENTION [0001] 1. Field of the Invention [0002] The present invention pertains to an aqueous inkjet ink made from certain titanium dioxide slurries and an associated inkjet ink set for inkjet printing. The invention also pertains to a method of inkjet printing with the ink and ink set. The use of the specific titanium dioxide slurries described herein result in inkjet inks having improved stability and better anti-settling performance with less pigment agglomeration and flocculation over time. [0003] 2. Description of the Related Art [0004] Inkjet printing is a non-impact printing process in which droplets of ink are deposited on print media, such as paper or polymeric substrates, to form the desired image. The droplets are ejected from a printhead in response to electrical signals generated by a microprocessor. [0005] Colored inkjet inks comprise one or more colorants that are dissolved (e.g., dyes) and / or dispersed (e.g., pigments and dispersed dyes) in the ink...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): C09D11/00C09D11/10
CPCB41M5/0023C09D11/101C09D11/40C09D11/326C09D11/36C09D11/322
Inventor LIN, TYAU-JEENMCINTYRE, PATRICK F.ELWAKIL, HAMDY A.
Owner EI DU PONT DE NEMOURS & CO
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