Jochen Wilms, BYK-Chemie (Altana Group) Showed developments in use of natural and modified clay minerals as PIN flame retardant synergists, based on mined bentonites (montmorillonite, smectite). Functionalisation with amines enables exfoliation of clays in processing, improving dispersion of platelets into the polymer. These platelets, with a high aspect ratio (surface area/thickness) can inhibit gas movement through the polymer in case of fire, prevent dripping, stabilise char and also improve polymer mechanical properties and scratch resistance. The clays can also be delivered in a concentrate with a special grafted polymer. The use of coupling agents brings in general polarity, so improving the effects of the clay.
BYK-Chemie (Altana Group)
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