Flame retardant compositions

C - Chemistry – Metallurgy – 08 – K

Patent

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Details

C08K 5/5399 (2006.01) C08K 5/16 (2006.01) C08K 5/32 (2006.01) C08K 5/34 (2006.01) C08K 5/3432 (2006.01) C08K 5/00 (2006.01)

Patent

CA 2476294

Organic polymeric substrates, for example polyolefins such as polypropylene, can be made flame retardant by the incorporation of a synergistic mixture of (i) at least one compound selected from the group consisting of the (a) sterically hindered nitroxyl stabilizers, (b) sterically hindered hydroxylamine stabilizers and (c) sterically hindered alkoxyamine stabilizers and (ii) at least one phosphazene flame retardant. Advantageously, a further flame retardant may be added, without the need of adding an antimony synergist. The compositions of the invention combine good flame retardant properties with light stability and good mechanical properties.

Selon la présente invention, des substrats polymères organiques, par exemple des polyoléfines telles que du polypropylène, peuvent être rendus ignifuges par incorporation d'un mélange synergique comprenant (i) au moins un composé sélectionné dans le groupe constitué (a) des stabilisants de nitroxyle à encombrement stérique, (b) des stabilisants d'hydroxylamine à encombrement stérique et (c) des stabilisants d'alcoxyamine à encombrement stérique et (ii) au moins un ignifuge de phosphazène. De manière avantageuse, un autre ignifuge peut être ajouté, sans qu'il soit nécessaire d'ajouter un synergiste d'antimoine. Les compositions selon l'invention associent de bonnes propriétés ignifuges avec une stabilité à la lumière et de bonnes propriétés mécaniques.

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