Novel sulfonium salts and the use thereof as photoinitiators
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United States of America Patent
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Jun 12, 1990
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N/A
app pub date -
Feb 29, 1988
filing date -
Feb 29, 1988
priority date (Note) -
Expired
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Abstract
Sulfonium and oxysulfonium salts, useful as photoinitiators, have directly attached to the sulfur atom thereof: at least one aromatic or heterocyclic aromatic substituent containing at least 14 aromatic atoms and having a removable positive hydrogen ion, said substituent exhibiting a higher energy occupied molecular orbital than at least one other substituent directly attached to said sulfur atom; and at least one substituent comprising an electron withdrawing group and exhibiting a lower energy unoccupied molecular orbital than at least one other substituent directly attached to said sulfur atom; said salt being capable, upon exposure to visible radiation, of undergoing irreversible intramolecular rearrangement to form a Bronsted acid comprising the anion of said salt and said removable positive hydrogen ion.
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