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Highly Soluble, Thermally Stable Photoacid Initiators

IP.com Disclosure Number: IPCOM000108398D
Original Publication Date: 1992-May-01
Included in the Prior Art Database: 2005-Mar-22
Document File: 1 page(s) / 33K

Publishing Venue

IBM

Related People

Hacker, NP: AUTHOR [+2]

Abstract

Disclosed are new triphenylsulfonium salt photoinitiators which exhibit enhanced solubility in organic solvents and polymers and are thermally stable, yet efficiently generate acid upon photolysis.

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Highly Soluble, Thermally Stable Photoacid Initiators

      Disclosed are new triphenylsulfonium salt photoinitiators which
exhibit enhanced solubility in organic solvents and polymers and are
thermally stable, yet efficiently generate acid upon photolysis.

      Triphenylsulfonium perfluorobutanesulfonate,
perfluorohexanesulfonate, perfluoro-octanesulfonate and
perfluorodecanesulfonate were prepared from reaction of
triphenylsulfonium bromide with the respective perfluroalkanesulfonic
acid.  These triphenylsulfonium perfluoroalkanesulfonate salts were
all soluble in organic solvents including toluene.  In contrast all
other triphenylsulfonium salts (e.g., triflate or
hexafluoroantimonate) are insoluble in toluene.  The
triphenylsulfonium perfluoroalkanesulfonate salts generated acid upon
photolysis in poly(4-tertbutoxycarbonyloxystyrene) films to give
poly(4-hydroxystyrene), identified by infrared spectroscopy.  In
addition the triphenylsulfonium perfluoroalkanesulfonate salts were
thermally stable showing less than 0.5% weight loss at 300~C by
thermogravimetric analysis.

      Disclosed anonymously.