Flame retardants for polymers comprising a mixture of two different aryl phosphates, their preparation and their use

Aryl phosphate mixture comprising aryl phosphates type I of the general formula (I)

• 5
• where
• R1 to R4, independently of one another, are hydrogen, alkyl, cycloalkyl, alkenyl, aralkyl or aryl, where the aryl moiety is optionally unsubstituted or have alkyl substitution,
• Y is oxygen or sulphur,
• X is OH, SH, COOH, COOR5, NH2, NHR6, NR6R7 or CN,
• where R5 to R7, independently of one another, are as defined for R1 to R4, and
• n is 0, 1 or 2, and
• aryl phosphates type II of the general formula (II)
• 6
• where
• R8 to R15, independently of one another, are hydrogen, alkyl, cycloalkyl, alkenyl, aralkyl or aryl, where the aryl moiety is optionally unsubstituted or have alkyl substitution,
• m is 0, 1, 2 or 3 and
• A is aromatics which contain at least two functional groups.