Ultraviolet-curable cationic vinyl ether polyurethane coating compositions
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United States of America Patent
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Sep 11, 1990
Grant Date -
N/A
app pub date -
Sep 13, 1988
filing date -
Sep 13, 1988
priority date (Note) -
Expired
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Abstract
Substantially hydroxy free, liquid, ultraviolet-curable compositions comprise cationically polymerizable ethylenically unsaturated material including a vinyl ether-terminated polyurethane which is the reaction product of isocyanate-reactive material including a monohydric vinyl ether and a diisocyanate having the formula: ##STR1## in which R is an alkylene group containing from 1-10 carbon atoms, this polyurethane having a number average molecular weight in the range of from 2000 to 6000, and a curing effective amount of a cationic photoinitiator which initiates a cationic cure when exposed to ultraviolet light, but less than 1% thereof based on the weight of the unsaturated material subjected to polymerization. These coatings are applied with a thickness of from 1 to 10 mils and cured with ultraviolet light, and they are particularly adapted to provide primary and single coatings for optical glass fiber.
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