Ciba-Geigy Corporation

Bjorn Elman

Jan-Erik Nystrom

Martin Nylöf

Jan Vågberg

Johan Nyander

Per Engelhardt

Sven Göthe

Katarina Beierlein

Mikael Sellen

Sonny Jonsson

Ann-Britt Pettersson

Per-Erik Sundell

A process for the production of a 5-7 membered ring cyclic sulfonium salt compound, including a 5-7 membered ring cyclic sulfonium salt compound having a non-nucleophilic anion, is described. Members of the latter group are potentially useful as initiators for cationic polymerizations. The process comprises reacting a 1.4-, 1.5-, or 1.6-diol compound or a 5-7 membered ring cyclic ether compound with a mercapto compound and a strong protonic acid yielding the cyclic sulfonium salt compound. Some compounds described are also novel compounds per se.

Process for the production of cyclic sulfonium salts

Initiators for polymerization

Growing community of inventors

Marsta, Sweden

Bjorn Elman