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Hangzhou Fancheng Chemical Co.,Ltd | Updated: Dec 29, 2016

For coloration purposes organic and inorganic pigments are widely used. Inorganic pigments are found in nature like iron oxide pigments which are synthesized and sold by LANXESS as high purity BAYFERROX® pigments. Inorganic pigments do show very high chemical resistance and light fastness. The colours are not as bright as organic pigments or even dyestuffs. Hiding power is the strength to cover surfaces by strong light scattering.

Organic pigments are more transparent but still do show some hiding power. The colours can be reasonably bright. Inorganic pigments find their main application in the construction field for indoor and outdoor usage while organic pigments dominate paint and printing.

Compared to dyes pigments have generally good stability properties but are difficult to process. Since pigments do not dissolve in any standard solvents they have to be dispersed requiring addition of dispersion additives and grinding.

So, for very large consumption it is economic for producers to install own appropriate grinding and mixing technology. If colours are used for shading a production may be less economic due to large cleaning downtimes and product losses in the equipment. In view of this, ready to use pigment dispersions - also called pigment preparations - have found acceptance in the market. 

To achieve fast drying time, solvent based systems have been dominating in the past but have been replaced more and more by water based systems. This is due to ecological concerns like toxicity, odour and ease of disposal. Especially the amount of volatile components has to be minimized.

So for applications which do use water based or similar polar systems water based pigment dispersions can be used.