Use of unsaturated diacyl or acylcarbonate peroxides in cross-linking processes
AssigneeAkzo Nobel N.V.
InventorsJernej Jelenic, Charles Manuel Navarro, John Meijer
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Abstract
The invention relates to curing process wherein specific unsaturated diacyl-peroxides and/or unsaturated acylperoxycarbonates are used. These peroxides were found to be pre-eminently suited to the curing of silicone rubbers and polyester resins. Their use does not lead to blooming, bad smell and/or discoloration of the cured product, while allowing low residual monomer levels to be obtained at processing temperatures below the temperature used in conventional processes wherein peroxyesters are used.
Claims13
A process of curing a polymer, other than a blend of poly(ethylene terephthalate) and a monovinylarene/cojugated diene block copolymer, wherein an organic peroxide is used as a source of free radicals, characterized in that at least one organic peroxide is selected from the group consisting of peroxides according to formula
- and mixtures thereof, wherein
- n=0 or 1,
- R1, R2, and R3 are independently selected from a first group consisting of hydrogen, C1-C20 alkyl, C2-C20 alkenyl, C2-C20 alkynyl, C3-C20 cycloalkyl, C3-C20 cycloalkenyl, C6-C20 aryl, C7-C20 aralkyl, and C7-C20 alkaryl, wherein the first group may include linear or branched alkyl moieties and which optionally are substituted with one or more groups selected from hydroxy, alkoxy, linear or branched polyalkyloxy aryloxy, halogen, ester, ketone, carboxy, nitrile, and amido, where any pair of R1-R2, R1-R3, and R2-R3may be linked to form a cyclic structure and R1, R2, and R3 may also be linked to form a polycyclic structure, and R4is selected from a second group of radicals consisting of C1-C20 alkyl, C1-C20 alkenyl, C2-C20 alkynyl, C3-C20 cycloalkyl, C3-C20 cycloalkenyl C6-C20 aryl, C7-C20 aralkyl, and C7-C20 alkaryl, wherein the second group may include linear or branched alkyl moieties and which optionally are substituted with one or more groups selected from hydroxy, alkoxy, linear or branched polyalkyloxy, aryloxy, halogen, ester, ketone, carboxy, nitrile, and amido, and radicals of formulae II and III,
- wherein
- m=0 or 1,
- R5 is selected from C1-20 alkylene, C1-20 alkenylene, C2-C20 alkynylene, C3-C20 cycloalkylene, C3-C20 cycloalkenylene, C6-C20 arylene, C7-20aralkylene, and C7-20aralkenylene groups, which groups may include linear or branched alkyl moieties and all of which may optionally contain one or more hetero atoms, and wherein
- R6, R7, R8, and R1′, R2′, R3′are independently selected from the group consisting of compounds according to the definition of R1, R2, and R3, respectively.
Dependencies are inferred from the claim text.