Nanoparticle based inks and methods of making the same

a nanoparticle and ink technology, applied in the field of nanoparticles and inks, can solve the problems that colorants tend to bleed when applied to fabrics, colorants cannot be applied to colorants on a particular substrate in general, etc., to achieve the effect of stabilizing colorants, enhancing substrate independent durability performance of inks, and improving water and detergent resistan

Inactive Publication Date: 2006-07-06
KIMBERLY-CLARK WORLDWIDE INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0012] The present invention is directed to, among other things, new recording mediums, new inks, ink compositions, nanoparticles, methods of making and using nanoparticles, methods for stabilizing colorants against photodecomposition, and methods for stabilizing colorants against oxidation or reduction. In accordance with the present invention such recording mediums, when applied to substrates, exhibit improved water and detergent resistance. The present invention includes methods for enhancing the substrate independent durability performance of inks and methods to stabilize colorants against fading due to interactions with a substrate, as well as methods for color density control. By employing a nanoparticle template upon which to bind a colorant and / or charged polymer-colorant layer(s), this invention provides new recording mediums and ways to control their stability, durability and color intensity.
[0015] The present invention is further directed to a method of stabilizing a colorant by assembling charged polymer layers, including multiple, alternating layers of charged polymer-colorant and colorless charged polymer, on a nanoparticle surface. In one aspect of the present invention, one or more colorant stabilizers are also incorporated in the charged polymer layers, thereby providing multiple levels of colorant protection from photodegradation mechanisms.
[0018] The above described nanoparticles are very effective in ink jet inks. Use of the nanoparticles, as described herein, intensifies the colors and stabilizes the colorants when they are exposed to light and other potentially degrading conditions. Additionally, the nanoparticles are effective in coatings for paper products and textiles.

Problems solved by technology

It is due to this complex behavior that observations for the fading of a particular colorant on a particular substrate cannot be applied to colorants and substrates in general.
Studies have revealed that this is not always the case.
In addition to fading, colorants tend to bleed when applied to fabrics.

Method used

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  • Nanoparticle based inks and methods of making the same
  • Nanoparticle based inks and methods of making the same
  • Nanoparticle based inks and methods of making the same

Examples

Experimental program
Comparison scheme
Effect test

example 1

Preparation of Polyelectrolyte-Magenta Dye-Coated Silica Nanoparticles

[0101] A charged polymer-dye solution was first prepared as follows. A 20 mL sample of 10−2 M poly(butyl acrylate-methacryloxyethyl trimethylammonium bromide charged polymer was stirred while a solution of 0.06 g of acid red 52 (AR52) was added at room temperature. This solution was stirred for 20 min. The charged polymer-dye solution prepared in this fashion was then added to a suspension of 0.1% w / w colloidal silica (prepared from commercially available SNOWTEX™ C) which also contained 0.5 M NaCl. After this mixture was stirred for 20 min, the mixture was centrifuged (10,000 g) and the resulting magenta-colored powder was washed with water 3 times and centrifuged each time. The magenta powder from this experiment was suspended in water and placed in a dialysis bag overnight (ca. 16 h), with water as the partition. No dye was observed to diffuse out of the bag in this dialysis experiment.

example 2

Preparation of a Polyelectrolyte Coated Silica Nanoparticles

[0102] To a stirred suspension of 0.1% w / w colloidal silica (SNOWTEX™ C) in a 0.5 M salt solution was slowly added a 0.01 M charged polymer solution, comprising polybutyl acrylate-methacryloxyethyl trimethylammonium bromide. This mixture was centrifuged (10,000 g) and the resulting washed with water 3 times. This reaction generated a white powder comprising a charged polymer layered nanoparticle.

example 3

Dialysis Control Experiment

[0103] To examine a control dialysis experiment to compare with the results in Example 1, a solution containing only Acid Red 52 dye (AR52) was placed in a dialysis bag overnight with water as a partition. In contrast to the nanoparticle suspension dialysis experiment in Example 1, dye was observed to dialyze out of the bag overnight (ca. 16 h) in this control.

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Abstract

The present invention provides nanoparticle based recording mediums, inks and ink compositions, methods of making nanoparticle based recording mediums and inks, nanoparticles and methods for making nanoparticles, methods for stabilizing colorants against electromagnetic radiation (including radiation in the visible wavelength range), methods for enhancing the substrate independent durability performance of inks, and methods for color density control. The nanoparticle based inks deliver better color, color density control, improved printability, enhanced durability, and increased lightfastness, and are capable of being printed on woven and non-woven fabrics and paper products without special treatment or other limitations.

Description

CROSS REFERENCE TO RELATED APPLICATIONS [0001] This application claims priority to Provisional Application Ser. No. 60 / 237,142, filed Oct. 2, 2000, and Ser. No. 60 / 243,022, filed Oct. 25, 2000, the entirety of which are incorporated herein by reference.TECHNICAL FIELD [0002] The present invention relates to recording mediums, inks, ink compositions, methods of making recording mediums and inks, nanoparticles and methods of making nanoparticles. BACKGROUND OF THE INVENTION [0003] Typically, colorants tend to fade when exposed to electromagnetic radiation such as sunlight or artificial light and the like. It is believed that most of the fading of colorants when exposed to light is due to photodegradation mechanisms. These photodegradation mechanisms include oxidation or reduction of the colorants depending upon the environmental conditions in which the colorant is placed. Fading of colorants also depends upon the substrate upon which they reside. [0004] Product analysis of stable phot...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): C09D151/00B41J2/01B41M5/00B41M5/52B82B1/00C09D11/00
CPCB41M5/5218C09D11/30Y10T428/2998Y10T428/2993Y10T428/254Y10T428/2991B41M5/00B82Y30/00
Inventor NOHR, RONALD S.MACDONALD, JOHN GAVINKRONBERG, BENGT GUNNAR
Owner KIMBERLY-CLARK WORLDWIDE INC
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