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Radiofrequency activated inkjet inks and apparatus for inkjet printing

Inactive Publication Date: 2006-05-25
CODACO +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0005] One aspect of the present invention provides fast-drying RF inkjet compositions. The RF inkjet compositions include at least one RF susceptor, a colorant and at least one polar carrier. It is believed that the RF inkjet composition generates heat when exposed to radiofrequency energies from ionic conduction caused by the movement of dissociated ions. This internally-generated heat enhances evaporation of volatile liquids from the ink compositions and results in shorter drying times. In some instances, the inkjet compositions provided herein, may be dried at a rate fast enough to allow for a printing speed of one page per second, or even faster, without any smearing of the inks.
[0006] In one embodiment of the RF inkjet composition, RF energy is used to cause a chemical reaction in the ink during drying. This produces images with improved resistance properties due to crosslinking. However the wet inks retain resolubility during printing as drying and crosslinking occur upon RF activation. Accordingly these inks cause reduced clogging of the inkjet heads.
[0007] Another embodiment of the inkjet inks provides RF inkjet compositions wherein chemical reactions are used for binding of inks to media. In one aspect of this invention, media containing reactive groups for reaction with the RF activated inkjet inks are used. Reaction between inks and media occur upon exposure to RF energy. This allows printing on non-porous media such as plastic films or modified paper substrates with improved resistance properties of images produced.

Problems solved by technology

However the wet inks retain resolubility during printing as drying and crosslinking occur upon RF activation.

Method used

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  • Radiofrequency activated inkjet inks and apparatus for inkjet printing
  • Radiofrequency activated inkjet inks and apparatus for inkjet printing
  • Radiofrequency activated inkjet inks and apparatus for inkjet printing

Examples

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example 1

Preparation of a Radiofrequency-Activatable Styrene-Acrylic Ionomer

[0089] This example describes the production of a styrene-acrylic resin ionomer for use in radiofrequency-activatable RF inkjet composition. The solution was prepared from a commercially available styrene-acrylic resin, JONCRYL™ 682. JONCRYL™ 682 is a low molecular weight styrene-acrylic resin available from Johnson Polymer, Sturtevant, Wis. JONCRYL™ 682 has an acid number of 238 mg KOH / g, glass transition temperature of 56° C. and a weight average molecular weight of approximately 1700. An amount of 25.424 parts by weight of JONCRYL™ 682™ was neutralized with 7.926 parts of a 85 wt. % active potassium hydroxide pellets and 66.649 parts water. The resulting neutralized batch was then heated to 80° C. under nitrogen and agitated for 3 hours until a clear mixture was obtained. The resulting solids of the mixture was 30% and pH of 13.3.

example 2

Preparation of RF Inkjet Composition from a Styrene-Acrylic Ionomer

[0090] This example describes the production of radiofrequency-activatable black inks from the ionomer of Example 1. Six inkjet inks are made from a commercially available ink to which the ionomer of Example 1 is added. Three inks also include glycerol as an organic polar carrier. The ink formulations (I1-I6) for each of the six inkjet inks are provided in Table 1. The amount of each component in Table 1 is given in wt. %, based on the total weight of the ink formulation.

TABLE 1INK FORMULATIONSI1I2I3I4I5I6Water50-90 43-7738-6850-90  43-77  38-68Isopropanol0-15 0-13 0-110-15  0-13  0-11Butylene Glycol0.1-15  0.75-13  0.75-12  0.1-15  0.75-13 0.75-12Glycerol0 0 01.3 3.86.3Ionomer515253.7511.2518.75Carbon Black1-150.5-13 0.75-7.5 1-150.5-13 0.75-7.5

example 3

Preparation of RF Inkjet Composition from a Styrene-Acrylic Ionomer

[0091] This example describes the production of radiofrequency-activatable inks from the ionomer of Example 1. Six inkjet inks are made from a commercially available ink to which the ionomer of Example 1 is added. Each of the inks include glycerol as an organic polar carrier. The ink formulations (I7-I12) for each of the six inkjet inks are provided in Table 2. The amount of each component in Table 2 is given in wt. %, based on the total weight of the ink formulation.

TABLE 2INK FORMULATIONSI7I8I9I10I11I12Water70-90 60-77 53-68 70-90 60-7753-68 Isopropanol0-5 0-4 0-4 0-5 0-40-4 Ethylene Glycol0-100-9 0-8 0-100-90-8 Glycerol5-105-105-106.5-11.5  8-12.510-14 Ionomer515253.7511.2518.75Water Soluble Dye5-10 4-8.5 4-7.55-10  4-8.5 4-7.5

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Abstract

This invention relates to fast-drying RF inkjet composition and apparatus for inkjet printing RF inkjet compositions. The compositions and apparatus are useful for inkjet printing onto a variety of media including both porous and non-porous substrates. The RF inkjet composition desirably includes RF susceptors combined with polar carriers which may be activated by RF energy to generate heat within the RF inkjet composition, resulting in enhanced evaporative drying.

Description

FIELD OF THE INVENTION [0001] The present invention provides radiofrequency (RF) activatable inkjet inks, methods for printing the inks and apparatus for inkjet printing using RF inkjet compositions. BACKGROUND OF THE INVENTION [0002] Most inkjet inks currently available are low viscosity liquids which contain large amounts of water, often 90 weight percent or greater. The use of water as a solvent in these inks is advantageous because it is inexpensive, environmentally friendly and non-toxic. Unfortunately, water also has a relatively high boiling point and a high latent heat of evaporation. For this reason, inkjet inks which contain large amounts of water tend to be slow-drying. Slow-drying inks are disfavored for many printing applications because they lead to slow printing rates. [0003] To speed up the printing rate of water-based inkjet inks, printing equipment may employ external heating devices to speed up the evaporation of water from the inks. Inkjet drying techniques inclu...

Claims

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Application Information

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IPC IPC(8): B41J2/01
CPCB41J2/17593B41J11/002C09D11/30C09D11/34C09D11/40D06P1/5221D06P1/5257D06P5/2011D06P5/2066D06P5/2083D06P5/30B41J11/00216
Inventor DIAMOND, ARTHUR S.GORBOLD, JONATHAN M.GORBOLD, TIMOTHY D.TEACHOUT, BRIAN L.BROTTON, DAVID E.CAMPBELL, J. DAVIDCHYLLA, RICHARD W. JR.DALTON, MICHAEL A.DEBLING, JON A.
Owner CODACO
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