| abstract |
The present invention relates to a new class of peroxides and to a process for the preparation of these peroxides having general formula (I), wherein n=1 or 2, R1, R2, R4, R5 and R6 are independently selected from the group comprising hydrogen, C1-C20 alkyl, C3-C20 cycloalkyl, C6-C20 aryl, C7-C20 aralkyl, and C7-C20 alkaryl, or R1 and R2 form a C3-C12 cycloalkyl group, which groups may include linear or branched alkyl moieties; and each of R1, R2, R4, R5 and R6 may optionally be substituted with one or more groups selected from hydroxy, alkoxy, linear or branched alkyl, aryloxy, halogen, ester, carboxy, nitrile, and amido, and R1 and R2 may form a ring, and R3 is independently selected from the group comprising C1-C20 alkyl, C3-C20 cycloalkyl, C6-C20 aryl, C7-C20 aralkyl, and C7-C20 alkaryl, which groups may include linear or branched alkyl moieties; and R3 may optionally be substituted with one or more groups selected from hydroxy, alkoxy, linear or branched alkyl, aryloxy, halogen, ester, carboxy, nitrile, and amido, and any pair of the optionally substituted R3, R4, R5, and R6 may form a ring, comprising the reaction of the corresponding ketone peroxide with general formula (II), wherein n, R1, and R2 have the identified meaning, with an alkyl vinyl ether with general formula (IIIa) or with an acetal with general formula (IIIb), wherein R3, R4, R5, and R6 have the identified meaning, in the presence of a catalyst, to the use of these peroxides as polymerization initiator, curing for unsaturated polyester, and/or modifying agent, and to formulations comprising these peroxides and a carrier or diluent. |