Brominated polystyrenic flame retardants

Details Brominated polystyrenic flame retardants Brominated polystyrenic flame retardants

C - Chemistry, Metallurgy

08

L

C08L 25/18 (2006.01) C08J 3/215 (2006.01) C08K 3/22 (2006.01) C09K 21/14 (2006.01)

Patent

CA 2328178

This invention relates to a thermally stable brominated polystyrene composition which contains alkali metal base (e.g., NaOH) in an amount less than about 1 wt.% such that if the flame retardant is dissolved in bromochloromethane and the resultant solution is extracted with water, the resultant water extract exhibits a pH of at least about 9Ø A preferred composition of this type even when heated to 315 °C for one hour did not undergo darkening - the color remained tan. Comparative samples not containing the base turned black under these same conditions. Especially useful compositions additionally have less than 500 ppm, and better still, less than 100 ppm total Cl, and at least about 67 wt.% bromine. Processes for producing the compositions are also described.

L'invention concerne une composition de polystyrène bromuré stable, contenant une base de métal alcalin (ex. NaOH) en quantité inférieure à environ 1 % en poids, de manière que si le matériau ignifugeant est dissous dans du bromochlorométhane et que la solution résultante est extraite avec l'eau, l'extrait aqueux résultant présente un pH d'au moins environ 9,0. Une composition préférée de ce type, même lorsqu'elle est chauffée jusqu'à 315 DEG C pendant une heure, ne noircit pas, sa couleur restant tannique. Des échantillons comparatifs ne contenant pas ladite base, noircissent intégralement dans les même conditions. Les compositions particulièrement utiles contiennent moins de 500 ppm, et idéalement, moins de 100 ppm au total de Cl, et au moins environ 67 % en poids de bromure. Les procédés de production des compositions sont également décrits.

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