Sulfonium salts having acid-labile groups

US5191124A · kind A · utility

Assignee

• BASF SE

Inventors

• Reinhold Schwalm · Monsheim, DE
• Andreas Boettcher · Leimen, DE

Key dates

• Filing date: Jun 30, 1988
• Grant date: Mar 2, 1993
• Expiry date: Jun 30, 2008

Classification

• Technology area (CPC G): Physics
• CPC primary: G03F7/029
• WIPO field: Organic fine chemistry
• WIPO sector: Chemistry

Abstract

Sulfonium salts of the general formula ##STR1## where R.sup.1, R.sup.2 and R.sup.3 are identical or different and are aliphatic and/or aromatic radicals which may contain heteroatoms, or two of the radicals R.sup.1 and R.sup.3 are bonded to one another to form a ring, with the proviso that one or more of the radicals R.sup.1 to R.sup.3 contain one or more acid-cleavable groups, or one of the radicals R.sup.1 to R.sup.3 is bonded to one or more further sulfonium salt radicals, if desired via acid-cleavable groups, and X.sup..crclbar. is a non-nucleophilic counter-ion, are suitable as photoinitiators for cationic polymerization.