colour | Pigments


Right: Macrolex Gran’s hollow granular


structure simplifies handling


compared to powders, claims Rhein Chemie


colourants. Because of this ‘single-sourcing’ of SPDs, multinational customers are supplied with precisely the same colours at multiple plant locations.” The Rhein Chemie Additives business unit of


Lanxess has developed its organic Macrolex Gran colourants for amorphous and semi-crystalline plastics. The company says that, due to their microgranule form, the colourants compare favourably with powders and compact granules owing to their good dispersion and processing properties, together with safer handling. Macrolex microgranules consist of hollow spheres that


are easily crushed, which means they can be quickly, evenly and completely distributed and incorporated into the plastic. The good processability of the product is said to be due to the fact that the hollow spheres comprise particularly small primary particles of between 2-10 microns depending on the colour. Lanxess adds that the good free-flowing properties of the 0.3mm spheres makes precise metering easier and prevents clumping during the mixing process. The four times higher bulk density compared with powder is also beneficial in processing, transport and storage. In addition, Rhein Chemie says the Macrolex granules


make an important contribution to occupational safety and environmental protection - containers can be easily and completely emptied, for example. Dust development during processing with Macrolex Gran is said to be much less than with powders, which means there is a considerably reduced risk of dust explosion with a consequent saving on expensive protective measures and facility cleaning. According to the company, the Macrolex Gran microgranule size has been selected so that the hollow spheres are big enough to form very little dust yet small enough to enable rapid and complete


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