Modified pigments and use thereof

Abstract

A modified organic pigment can be used to make a coating composition, such as a paint, a varnish, or a printing ink. The modified organic pigment is obtained by reacting the pigments during the pigment synthesis with at least one interface-active compound, where the interface-active compound is a compound within a three-dimensional Hansen space determined by three coordinates, Hansen solubility parameters (HSPs), D=18.21, P=8.44, H=13.16 with a radius of 6.7 units about a center of the three-dimensional Hansen space, determined with the aid of the HSPiP software, version 5.0.0.4.

Description

BACKGROUND OF THE INVENTIONFIELD OF THE INVENTION[0001]The present invention relates to modified organic pigments, and to the production and use thereof in paints, varnishes, printing inks and other coating materials.DISCUSSION OF THE BACKGROUND[0002]Pigments are colouring substances present in insoluble dispersed form in the application medium. Application media are, for example, organic solvents, paints, varnishes, pigment preparations, printing inks and other coatings in which the pigment is incorporated. Typically, the crude pigments formed in the synthesis are ground or comminuted. There are various known fine distribution methods for conversion of a crude pigment to pigment or pre-pigment form, called dry grinding and wet grinding methods. In the dry and wet grinding methods, use of grinding bodies results in abrasion and hence introduction of extraneous substances into the product.[0003]In other known processes for production of particulate pigments, the pulverulent pigments ...

AI Technical Summary

Benefits of technology

The present invention relates to modified organic pigments that can be obtained by reacting the pigments during synthesis with interface-active compounds. The interface-active compounds are selected based on their ability to interact with the pigment surface. The modified pigments have improved properties such as increased solubility, reduced crystallinity, and improved color brightness. The interface-active compounds can be chemical amphiphilic, ionic, nonionic compounds of low or high molecular weight, polyether-modified fatty adds, polyether-modified fatty acid amide amines, polyether-modified amine derivatives, polyether-modified oils and fats, polyether-modified styrene-maleic add copolymers and maleate resins, phosphorylated polyether derivatives, polyether-modified anthanthrone, anthraquinone, isoindanthrone, anthanthrone, anthraquinone, isodibenzanthrone, triphendioxazine, quinacridone, perylene, diketopyrrolopyrrole and phthalocyanine pigments. The modified pigments can be used in various applications such as pigment preparations and paint, varnish, printing ink, coating materials, floor coatings, potting compounds and filling compounds.

Problems solved by technology

In the dry and wet grinding methods, use of grinding bodies results in abrasion and hence introduction of extraneous substances into the product.

However, particles of small diameter have a particularly high tendency to agglomerate and therefore have to be stabilized.

Recombination of the primary particles and aggregates can lead to formation of sediment, increasing viscosity, losses of gloss, inadequate colour depth, low hiding capacity, phase separation of the pigments and poor reproducibility of colour shades.

Owing to the complexity of amphiphilic substances which additionally also fulfil unique functions, it is not easy to develop a simple model concept.

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