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 (I) wherein X <SUP>-</SUP> is a non or low coordinating anion, R1, R2, R3, R4 are independently linear, cyclic or branched C<SUB>1</SUB> - C<SUB>20</SUB> 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<SUB>3</SUB>)-, -S- and/or -0-, 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.