Patent ID: 7297734

Claim:
A process for preparing a synergistic stabilizer mixture comprising the components of the general formulae (I), (II) and (III), wherein the mixture comprises compound (I) in a fraction of 65-95%, compound, by weight (II) in a fraction of from 5 to 35%, by weight, and compound (III) in a fraction of from 0 to 10% by weight, wherein n and m independently of one another are a number from 0 to 100, but cannot both be 0, R 1 is hydrogen, C 5 -C 7 cycloalkyl or a C 1 -C 12 alkyl group, R 2 and R 3 independently of one another are a hydrogen atom, a C 1 -C 18 alkyl group or, together with the carbon atom connecting them, a ring with a size of from 5 to 13 or, together with the carbon atom joining them, a group of the formula (IV), R 4 and R 6 independently of one another are either hydrogen, a C 1 -C 22 alkyl group, an oxygen radical O*, —OH, —NO, —CH 2 CN, benzyl, allyl, a C 1 -C 30 alkyloxy group, a C 5 -C 12 cycloalkyloxy group, a C 6 -C 10 aryloxy group, in which the aryl radical may optionally be substituted further, a C 7 -C 20 arylalkyloxy group, in which the aryl radical may optionally be substituted further, a C 3 -C 10 alkenyl group, a C 3 -C 8 alkynyl group, a C 1 -C 10 acyl group, halogen, unsubstituted phenyl or C 1 -C 4 alkyl-substituted phenyl, comprising the steps of reacting at least one compound of the formula (V) in which R 1 , R 2 , R 3 and R 4 are as defined above and R 6 − is the anion of a protic acid with an epihalohydrin of the formula (VI) in which X is a chlorine, bromine or iodine atom and in an inert organic solvent in a phase transfer reaction to form a reaction mixture, and polymerizing the reaction mixture, wherein the inert organic solvent is used in a ratio of from 2:1 to 1:5 with respect to compound (VI).