Flame retardant compositions

C - Chemistry – Metallurgy – 08 – K

Patent

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C08K 5/00 (2006.01) C08K 5/3435 (2006.01)

Patent

CA 2440904

Polymeric substrates, for example polyolefins such as polypropylene, can be made flame retardant by the incorporation therein of a synergistic mixture of (i.) at least one compound selected from the group consisting of nitroxyl stabilizers, hydroxylamine stabilizers, nitrone stabilizers, substituted hydroxylamine stabilizers, amine oxide stabilizers, benzofuranone stabilizers, phosphite and phosphonite stabilizers, quinone methide stabilizers and monoacrylate esters of 2,2'- alkylidenebisphenol stabilizers and (ii.) at least one compound selected from the group consisting of brominated flame retardants, phosphorus containing flame retardants and inorganic flame retardants such as ammonium polyphosphate or decabromodiphenyl oxide; wherein the amount of organic or inorganic flame retardant of component (ii.) required to achieve an acceptable level of flame retardancy is significantly reduced compared to that needed when component (i. ) is not present.

Selon l'invention, des substrats polymères, par exemple des polyoléfines telles que le polypropylène, peuvent être rendus ignifugeants par intégration d'un mélange synergique (I) d'au moins un composé choisi dans le groupe des stabilisateurs nitroxyle, des stabilisateurs hydroxylamine, des stabilisateurs nitrone, des stabilisateurs hydroxylamine substitués, des stabilisateurs aminoxyde, des stabilisateurs benzofuranone, des stabilisateurs phosphite et phosphonite, des stabilisateurs quinone méthide, et des stabilisateurs d'esters monoacrylate de 2,2'-alkylidène bisphénol, et (II) d'au moins un composé choisi dans le groupe des agents ingnifugeants bromés, des agents ingnifugeants contenant du phosphore, et des agents ingnifugeants minéraux tels que ammonium polyphosphate ou oxyde de décabromodiphényl. La quantité d'agent ingnifugeant organique ou minéral du composant (II) nécessaire pour obtenir un pouvoir ignifugeant acceptable est réduite de manière significative par rapport à la quantité nécessaire en l'absence du composant (I).

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