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ABSTRACT
A liquid colorant is composed of a binder, in which a discontinuous phase is dispersed, the pigments and possibly other additives. Contrarily to solid colorants, liquid variations provide the following advantages: rapid results, easier and less cumbersome storage, they are non-perishable as they are always reusable. This article describes the coloring method based upon liquid pigment dispersion; implementation, dosage of colorants and choice of pigments according to a large number of criteria (coloring properties, aptitude to be transformed, conservation of mechanical properties, etc.). In conclusion method applications are presented.
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Daniel WYART: Chemical engineer CNAM (Conservatoire national des arts et métiers) - Former Sales and Marketing Director, Plastics Coloring Division – BASF Coatings SAS - with the kind collaboration of Jean-Jacques RIBLET (manager of 2R Couleur)
INTRODUCTION
The following describes a coloring method based on liquid pigment dispersions. By liquid pigment dispersions we mean a stable suspension of a pigment or colorant in a binder compatible with the plastic material. This pigment preparation is introduced at the base of the hopper of the injection molding machine or extruder during processing.
This dossier supplements the general dossier
or directly incorporated (generally by thermoplastic producers) into polymers with their other additives;
added (by processors) to base material granules prior to processing, in the form of masterbatches or dry blends.
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Liquid colorants based on pigment dispersions
Characteristics of liquid colorants
Standards and norms
- Matières plastiques. Évaluation qualitative de l'exsudation des colorants. (remplace : NF T 51-028 : 1965). Indice de classement : T51-028. - NF EN ISO 183 - 09-99
- Plastiques. Méthodes d'exposition à des sources lumineuses de laboratoire. Partie 2 : sources à arc au xénon. - NF EN ISO 4892-2 - 10-99
- Évaluation de la solidité de couleur par exposition à la lumière. - NF T 51-058 - 01-69
- Plastiques....
Directory
Manufacturers-Suppliers
Liquid colorants
2R Couleur http://www.2rcouleur.com[email protected] – France
BASF Color Solutions France http://www.basf-coatings.fr [email protected]...
Economic data
The 2008 price comparison is as follows:
dry pigments base 1
liquid dyes 1.2 to 1.3
masterbatches 1.3 to 1.5
The market share of liquid colorants for injection-molded polymers is currently estimated at 15% by volume of total colorants used in injection and injection-blow...
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