Since the late 1990s nanocomposites (polymer-layered silicates based on aluminosilicate clay minerals like montmorillonite, composed of layers with gaps (gallery spaces) in between) have been gaining increasing attention in flame retardancy area. Nanocomposites particularly prevent dripping and promote char formation. Therefore, they have been used as synergists in some polymer/flame retardant combinations. Previously nanocompositeflame retardants have been tested in the plastics like polypropylene, polymethylmethacrylate (PMMA), polystyrene, and polyamides.It is shown that silicate nanocomposites can be successfully used as a flame retardant additive in the case of biodegradable matrix ( poly(lactid) acid).Nanocomposites prepared by melt blending were investigated. The materials were composed of poly(lactid acid) with addition of 2, 3, 5 and 8 wt.% of nanofillers (two grades of montmorillonite and calcium carbonate). Melt strength and fire resistance of the composites have been presented.

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