Flame-retardant polymeric composition with low halogen content, a concentrate of said composition, and a method for preparing said composition

摘要

A flame-retardant polymeric composition comprising (i) a polymer; (ii) a triazine or a mixture of halogenated or non-halogenated triazines; (iii) a bismuth compound of formula Bi_zA_w where A is X, O, CO₃, O₂CO₃; and (iv) a compound chosen between red phosphorus, a phosphorous compound or an organic compound capable of forming free radicals, in which the maximum content of halogen on the total of the components from (i) to (iv) in said composition is 1 wt %.