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Clariant Develops Innovative Wax for UV-Cured Paint Systems

Published on 2002-05-23. Author : SpecialChem

Migration-Resistant and UV-Reactive

A wax for UV paints which has been launched by Clariant is the only one of its kind world-wide. It is available in two physical forms with the product names Licomont® ER 165 and Ceridust® 5091. In stark contrast to conventional wax types, it can be firmly anchored in the paint film through light energy. This property contributes greatly to major improvements in UV-curable coatings.

This is due to the modification of the wax with recently-introduced reactive double bonds. These lead to additional bonds between wax and other substances in the paint during curing. The result is a two or three dimensional cross linkage which fixes the wax in the paint and prevents migration to the surface.

A striking feature is the extraordinary solvent resistance of UV- curable paints which, due to the use of migration-resistant waxes, is almost twice as good as that with the wax types familiar to date. A further advantage of the use of reactive waxes is to be found in the excellent and - more particularly - lasting matting as the firm anchoring of the wax in the coating practically prevents polishing.  Furthermore, temperature stability, surface lubricity and anti- blocking have all been considerably improved through the addition of the innovative Clariant waxes.

The two new products, Licomont® ER 165 in granule form and Ceridust® 5091 as a micropowder, are chemically identical and differ only in grain size and form. Ceridust® 5091 can be used directly in the paint/coating manufacture, whereas Licomont® ER 165 is used by preference in the manufacture of binder resins.

Fossil Origin

The raw material for the manufacture of Licomont® ER 165 and Ceridust® 5091 is montan wax. Crude montan wax is extracted from lignite and then refined and finished in a number of process steps:

During deresinification, the resins and tarry substances are extracted. The next step is bleaching with chromic acid. Hydrolyzation of the wax ester follows. The final product of the refining process is montan wax acid. This blend of acids is the raw material for the synthesis of the UV-reactive waxes from Clariant.

Impressive Variety

The term "wax" does not actually describe a class of chemical substances. Rather it is a collective term for all materials which display the typical "wax properties". A distinction is made between natural waxes (beeswax and carnauba wax) fossil waxes (montan waxes, paraffins) and fully-synthetic waxes (polyolefin waxes).

The areas of application for waxes are wide-ranging. Waxes used to provide abrasion resistance in printing inks ensure that the ink remains on the substrate and are not rubbed off. In conventional paint systems and in powder coating, waxes provide improved scratch resistance, very good matting and good slip properties. Used as a dispersion aid in masterbatches, waxes permit an even distribution of the pigments. In PVC processing they act as separators and lubricants in the manufacture of sheeting, profiles and pipes. They ensure that the hot PVC molten mass does not stick to the calender/extruder. Montan waxes bring up the shine in cars, shoes and furniture.

The Business Line Waxes at Clariant AG offers waxes based on montan waxes, polyolefin waxes, amide waxes and oxidized waxes, as well as special products. Where necessary, they can be tailored precisely, in close cooperation with customer, to his wishes and requirements. Clariant waxes are available as granules, flakes or powder. The term Ceridust is used exclusively for the micronized waxes which, due to a special process, take the form of extremely fine powder and are consequently very easily dispersible. The d50-value for this type of wax can be as low as 5 µm.

Source: Clariant AG

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