Process for production of monosulfonium salts, cationic polymerization initiators, curable compositions, and products of curing
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United States of America Patent
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Issued Date -
Nov 2, 2006
app pub date -
Jun 24, 2004
filing date -
Jun 25, 2003
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Abstract
A monosulfonium salt in which very little unreacted raw material remains, which has a purity of at least 96%, and which has one sulfonio group in its molecule is manufactured without a refining step. After (a) an aryl compound, (b) a sulfoxide compound, (c) a dehydrating agent, and (d) a BF.sub.4, PF.sub.6, AsF.sub.6, or SbF.sub.6 salt of an alkali metal or an alkaline earth metal are introduced into a reaction system, (e) an inorganic acid is added, so that the aryl compound (a) and the sulfoxide compound (b) are subjected to dehydration condensation.
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