Process for the preparation of partially protected phenolic resins
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United States of America Patent
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Sep 2, 1997
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N/A
app pub date -
Dec 14, 1995
filing date -
Dec 20, 1994
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Expired
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Abstract
A process for the preparation of phenolic resins having acid-labile acetal or ketal protecting groups by reacting a phenolic resin with an enol ether in the presence of an acidic catalyst and subsequently treating the reaction mixture with a basic anion exchanger gives heat-resistant polymers which, in combination with acid photogenerators, produce radiation-sensitive compositions of high processing stability with a greatly improved shelf life.
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