METHOD FOR POLYMERIZATION OF ETHYLENE-UNSATURATED MONOMERS IN PRESENCE OF DIACYLPEROXIDES AS SOURCE OF FREE RADICALS Russian patent published in 2008 - IPC C08F4/34 C07C409/34 

FIELD: organic chemistry, chemical technology.

SUBSTANCE: invention relates to methods for polymerization of ethylene-unsaturated monomers in the presence of free radical initiating agents. Method involves the following steps: peroxidation step wherein an aqueous mixture is prepared and this mixture contains diacylperoxide of the formula (I): by interaction of one or some acid halogen anhydrides of the formula (II): with (i) MOOH/M₂O₂ wherein M represents any metal or ammonium-containing group that interacts with H₂O₂ to form MOOH/M₂O₂ without decomposition of one or some peroxides taking part in the process; M is chosen from group consisting of ammonium, sodium, potassium, magnesium, calcium and lithium, and/or (ii) one or some peracids of the formula (III): , or with their M salts in aqueous phase. Acid halogen anhydride or mixture of acid halogen anhydrides contact with water only containing MOOH/M₂O₂ and/or one or some peracids or peracid salts, preferably M₂O₂ or peracid salt M. Values of radicals in formulae (I), (II) and (III) are given in the invention description. One or some solvents for acid halogen anhydride, one or some salts, one or some colloidal and/or surface-active substances can be added before, in process or after the peroxidation step. Also, the process can comprise one or some steps for purification of an aqueous mixture, one or some steps of homogenization of an aqueous mixture. Then the process involves a step for transfer of product from precede steps that comprises diacylperoxide of the formula (I) into polymerization reactor, and thermal decomposition of this diacylperoxide to form organic free radicals in the presence of one or some ethylene-unsaturated monomers with polymerization of indicated monomers in indicated polymerization reactor. Invention provides synthesis and using peroxides in process for short time period that solved problems associated with peroxides.

EFFECT: improved method of polymerization.

13 cl, 3 ex