Food Colorant Meets Bio-Based Plastic
Combining plastics based on renewable raw materials with food colorants opens up new ways of achieving closed loop recycling. This has inspired the Grafe Group, Blankenhain, Germany, to develop a range of corresponding color masterbatches which it is presenting at Fakuma for the first time.
The silica (SiO2) encapsulated colorants (SECs) from Sensient Imaging Technologies GmbH, Bitterfeld-Wolfen, Germany, greatly restrict migration in plastics formulations. Silica was chosen because this natural material is found in foods and is approved for food applications. The silica matrix – a protective layer encapsulating the colorants – limits the oxidizing effect of oxygen on the colorant molecules. This improves the colorants’ resistance to solvents, water, pH, and environmental influences. At the same time, it reduces migration of the colorants out of the matrix. A wide range of natural and synthetic food colorants is available for the production of different color masterbatches. The coloring has been tested in various polymers, and this has led to the development of several color combinations, e. g. brown, green, orange, yellow, red and purple.
Grafe Advanced Polymers GmbH
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