Patent ID: 7456212

Claim:
A cyclic ketone peroxide polymerization initiator composition comprising: one or more cyclic ketone peroxides of formula (I) wherein R 1 -R 6 are independently selected from the group consisting of hydrogen, linear or branched C 1 -C 20 alkyl, C 3 -C 20 cycloalkyl, C 6 -C 20 aryl, C 7 -C 20 aralkyl and C 7 -C 20 alkaryl, and each of R 1 -R 6 may be optionally substituted with one or more groups selected from hydroxy, C 1 -C 20 alkoxy, linear or branched C 1 -C 20 alkyl, C 6 -C 20 aryloxy, halogen, ester, carboxy, nitrile, and amido, and whereby each of the combination of groups R 1 and R 2, R 3 and R 4, and R 5 and R 6, together with the carbon to which each combination of groups is attached may optionally form a cyclic moiety; and one or more dialkyl peroxides according to formula R 7 —O—O—R 8 (II), wherein R 7 and R 5 are independently selected from the group consisting of unsubstituted, linear or branched C 4 -C 20 alkyl, C 3 -C 20 cycloalkyl, C 6 -C 20 aryl, C 7 -C 20 aralkyl, and C 7 -C 20 alkaryl, wherein the composition does not form explosive crystals when stored at −25° C. for 24 hours.