Flame retardant compositions

C - Chemistry – Metallurgy – 08 – K

Patent

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Details

C08K 5/34 (2006.01) C08K 5/3435 (2006.01) C08K 5/3492 (2006.01)

Patent

CA 2498975

Organic polymeric substrates, for example polyolefins such as polypropylene, can be made flame retardant by the incorporation of a mixture of (i) at least one sterically hindered alkoxyamine stabiliser and (ii) at least one conventional flame retardant selected from the group consisting of the melamine based flame retardants. The compositions of the invention combine good flame retardant properties with light stability and good mechanical properties. Polyolefin molded articles are stabilised against light, heat and oxygen and made flame retardant with the incorporation of at least one sterically hindered alkoxyamine and at least one conventional flame retardant, while allowing normally high levels of flame-retardant fillers to be greatly reduced or eliminated.

L'invention concerne des substrats polymères organiques, par exemple des polyoléfines telles que le polypropylène, que l'on peut rendre ignifuges en y incorporant un mélange (i) d'au moins un stabilisant à base d'alcoxyamine à encombrement stérique et (ii) d'au moins un agent ignifugeant classique choisi dans le groupe comprenant les agents ignifugeants à base de mélamine. Ces compositions allient de manière avantageuse de bonnes propriétés ignifugeantes à une stabilité à la lumière et à de bonnes propriétés mécaniques. Les articles moulés à base de polyoléfine sont stables à la lumière, à la chaleur et à l'oxygène et ignifugés par incorporation d'au moins un agent ignifugeant à base d'alcoxyamine à encombrement stérique et d'au moins un agent ignifugeant classique, tandis que les charges ignifugeantes d'ordinaire présentes en concentrations élevées sont considérablement réduites ou éliminées.

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