Heat stable pigments for powder coatings

Specially developed Bayferrox® and Colortherm® pigments fulfill the high heat stability requirements necessary in the manufacture of powder coatings.

Powder coatings can be used in a variety of applications. They are predominantly used in the coating of metal or steel parts. Since powder coatings do not emit any volatile material, the product is highly environmentally friendly. 

The High Performance and High Performance Special Pigment ranges, which have been developed specifically for coatings applications, have a narrower specification range for color shade and color strength. In addition, they are distinguished by their high dispersibility. This is achieved by micronization, a very intense milling process which significantly reduces the level of pigment agglomerates. 

Pigments for use in powder coatings have to be extremely heat stable. From the Bayferrox® product ranges, red pigments manufactured using the Laux-process are widely used. As a result of the manufacturing process, which includes a high temperature calcining step, these pigments have a higher intrinsic hardness than other precipitated pigments. They are very resistant to color change during high energy dispersion processes. Moreover, the red pigments show outstanding heat stability. In addition to the Bayferrox® red pigments, two very heat stable manganese ferrites can also be applied; Bayferrox® 303T, a black pigment and Bayferrox® 645 T a brown pigment.

For coloring of yellow and green powder coatings, pigments from the Colortherm® product range are used. Normal iron oxide yellow pigments possess limited heat stability. Colortherm® Yellow 10 is subjected to an inorganic after treatment which was developed to increase the heat stability. Colortherm® Yellow 30 and Colortherm® Yellow 3950, both stabilized zinc ferrites, are also very heat stable and can be used very successfully in the manufacture of powder coatings. Colortherm® Green pigments are made from chromium oxides. They also exhibit excellent heat resistance, light fastness and weather stability.

The Global Competence Center Paint will gladly answer individual customer inquiries with respect to this field of application or to provide further information about LANXESS pigments.