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Pigmented inkjet ink with a polymeric dispersant containing a long aliphatic chain (meth)acrylate

A polymeric dispersant, inkjet ink technology, applied in the direction of ink, household utensils, applications, etc.

Inactive Publication Date: 2008-04-16
AGFA NV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0012] Although many kinds of polymeric dispersants have been proposed, the dispersion stability of pigments (especially in inkjet) still needs further improvement

Method used

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  • Pigmented inkjet ink with a polymeric dispersant containing a long aliphatic chain (meth)acrylate

Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0086] Preparation of Pigmented Inkjet Ink

[0087] The pigmented inkjet inks of the present invention can be prepared by precipitating or grinding pigments in a dispersion medium in the presence of a polymeric dispersant.

[0088] Mixing devices may include pressure kneaders, open kneaders, planetary mixers, dissolvers, and Dalton Universal Mixers. Suitable grinding and dispersing devices are ball mills, bead mills, colloid mills, high-speed dispersers, two-roll mill dispersers, bead mills, pigment conditioners, and three-roll mill dispersers. Dispersions can also be prepared using ultrasonic energy.

[0089] The preparation method of very fine pigment dispersion is found in for example: US 5679138 (KODAK), US 5538548 (BROTHER), US 5443628 (VIDEOJET SYSTEMS), US 4836852 (OLIVETTI), US 5285064 (EXTREL), US5184148 (CANON) and US 5223026 (XEROX).

[0090] spectral separation factor

[0091] The spectral separation factor SSF has been found to be an excellent method of ch...

Embodiment 1

[0140] This example illustrates the high quality (ie, wide color gamut (high SSF)) and high stability of magenta pigmented inkjet inks comprising long aliphatic chain (meth)acrylates.

[0141] Synthesis of Statistical Copolymers

[0142] Polymeric dispersants POL-1 to POL-8 with different compositions were synthesized. The polymeric dispersants POL-6 to POL-8 comprise long aliphatic chain methacrylate (LCMA).

[0143] Table 2

[0144] Quantity (grams)

[0145] BuA

[0146] The synthesis of the polymeric dispersant POL-6 (ie statistical copolymer P(AA-c-BuA-c-MMA-c-LCMA)) is illustrated.

[0147] In a 250 ml flask, add the following ingredients in succession: 0.10 g WAKO TM V601 initiator, 104.79 grams of IPA, 14.94 grams of acrylic acid, 20.33 grams of butyl acrylate, 5.74 grams of methyl methacrylate, 3.99 grams of decyl methacrylate, and 0.10 grams of alpha-methylstyrene dimer. After addition to the flask, the mixture was stirred and nitrogen was b...

Embodiment 2

[0169] This example demonstrates that polymeric dispersants comprising long aliphatic chain (meth)acrylates not only have excellent dispersion stability, but are also less sensitive to changes in the dispersion medium composition of pigmented inkjet inks. These changes can occur when volatile components in inkjet inks evaporate, for example, in open ink containers or at the nozzle plate of an inkjet printhead. 1,2-Hexanediol was used to vary the composition of the dispersion medium of pigmented inkjet inks.

[0170] Contrast with the preparation of pigment-containing inkjet ink COMP-7 and COMP-8 and invention pigment-containing inkjet ink INV-4 and INV-5: dilute respectively with 5% by weight of 1,2-hexanediol in Example 1 Prepared comparative pigmented inkjet inks COMP-5 and COMP-6, and inventive pigmented inkjet inks INV-1 and INV-2.

[0171] evaluate

[0172] The average particle size of each of the comparative pigmented inkjet inks COMP-5 to COMP-8 and the inventive pi...

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Abstract

A pigmented inkjet ink comprising a pigment and a polymeric dispersant wherein the polymeric dispersant is a statistical copolymer comprising between 3 and 11 mol% of a long aliphatic chain (meth)acrylate wherein the long aliphatic chain contains at least 10 carbon atoms.

Description

technical field [0001] The present invention relates to stable pigmented inkjet inks with polymeric dispersants comprising long chain (meth)acrylates. Background technique [0002] Pigment dispersions are prepared using dispersants. A dispersant is a substance that promotes and stabilizes the dispersion of pigment particles in a dispersion medium. Dispersants are generally surface-active substances with anionic, cationic or nonionic structures. The presence of a dispersant substantially reduces the required dispersion energy. Due to mutual attractive forces, dispersed pigment particles may tend to re-agglomerate after a dispersion operation. The use of dispersants also counteracts this tendency of the pigment particles to reagglomerate. [0003] Dispersants must meet particularly high demands when used in inkjet inks. Insufficient dispersion manifests itself as increased viscosity of liquid systems, loss of gloss and / or hue shift. Furthermore, a particularly good dispe...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09D11/00
CPCC09D11/101C09D11/326C09D11/40
Inventor L·格勒宁达尔G·德罗弗
Owner AGFA NV