Method for production of polymer-encapsulated pigments

A technology of polymers and pigments, applied in the direction of pigment slurry, microsphere preparation, organic dyes, etc.

Inactive Publication Date: 2008-01-02
CLARIANT PROD DEUT GMBH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Furthermore, it is not possible to obtain high pigment contents...

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0049] a) Preparation of water-based pigment dispersion:

[0050] 200ml of water and 6g of SDS (sodium dodecyl sulfate) were pre-charged into a glass beaker and mixed. 68 g of pigment powder P.Y. 74 were weighed into this mixture and predispersed by a dissolver at 3500 rpm for 15 minutes. This mixture was then introduced into a bead mill which was packed to 85-90% with ceramic beads (0.6-0.8 mm). The mixture was milled at 2000 rpm for 2 hours. Water (123ml) was then added and milling continued for 15 minutes to incorporate the water evenly. The dispersion is then discharged from the mill.

[0051] b) Preparation of stabilized monomer miniemulsion:

[0052] 6 g of styrene (monomer M), 250 mg of hexadecane (superhydrophobe) and 100 mg of AIBN (polymerization initiator PI) were added to a solution of 72 mg of sodium lauryl sulfate (surfactant T) in 24 g of water, And emulsify the mixture for one hour on the highest magnetic stirrer stage. This is followed by fine emulsifica...

Embodiment 2

[0058] The ratio of pigment to styrene was adjusted to 50 / 50. Similar to the preparation method of Example 1.

Embodiment 3

[0060] Similar to the preparation method of Example 1. Use butyl acrylate instead of styrene.

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PUM

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Abstract

The invention relates to a method for production of an aqueous dispersion of polymer-encapsulated pigments, characterised in that (a) an aqueous pigment dispersion, containing at least one organic pigment (P), selected from the group of azo, isoindolinone, isoindoline, anthanthrone, thioindigo, thiazinindigo, triarylcarbonium, quinophthalone, anthraquinone, dioxazine, phthalocyanine, quinacridone, quinacridonquinone, indanthrone, perylene, perinone, pyranthrone, diketopyrrolopyrrole, isoviolanthrone and azomethine pigments, at least one detergent (T), and water is prepared, (b) a monomer miniemulsion, stabilised by a hydrophobic organic compound with a water solubility at 20 DEG C of at most 5x10<-5> g/l, is prepared from a polymerisable monomer (M) and at least one detergent (T) in water, (c) a monomer pigment emulsion is prepared, whereby the aqueous dispersion from (a) and the monomer miniemulsion from (b) are mixed and homogenised and (d) the pigment-containing monomer from (c) is polymerised in the presence of a polymerisation initiator and/or by heat, whereupon an encapsulation of the pigment with the polymer thus formed occurs.

Description

technical field [0001] The invention relates to pigmented aqueous polymer dispersions of pigmented polymer particles in a finely divided state and to pigmented polymer powders prepared therefrom, and to their use as colorants in the printing sector and in varnishes and plastics, inkjet inks, color filters and toners. Background technique [0002] Colorant-containing polymer dispersions in which the colorant is a soluble dye are known from EP-A-1 191041 . The dye is only present in an amount of 0.5% to 50% by weight, based on the polymer matrix. Polymerization is carried out by conventional emulsion polymerization, in which the dye is present in dissolved form in the polymer. DE-A-198 52 784 describes miniemulsions and microemulsions which are suitable for the preparation of nanohybrid particles. In this approach, pigments are dispersed in monomers to form products with a broad distribution of particulate matter (with varying ratios of pigment to polymer within individual ...

Claims

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Application Information

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IPC IPC(8): C09B67/08C09D17/00
CPCC09B67/0013C09D17/003B01J13/02C09B67/00C09B67/0004
Inventor M·甘朔H·J·梅茨U·勒尔K-H·施穆卡特K·兰德费斯泰
Owner CLARIANT PROD DEUT GMBH
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