Sulfonium initiators, process for production and use in cationic polymerizable compositions

摘要

The invention relates to an initiator comprising at least one structural element characterized by the following formula:
wherein X - is a non or low coordinating anion, R1, R2, R3, R4 are independently linear, cyclic or branched C 1 - C 20 alkyl or alkylene groups, wherein one or more of the methylene groups contained in the alkyl or alkylene group can be substituted by -CO-,-CONH-, -CON(CH 3 )-, -S- and/or -O-, and wherein R1, R2, R3 and/or R4 can act as a bridging element connecting two or more structural elements. The invention is also related to a process of producing the initiator and to a curable composition comprising the initiator, a process for producing the curable composition a kit comprising a cationically curable composition and the inventive initiator and the use of the initiator or the curable composition comprising the initiator for various applications, especially in the dental field.