Topcoats for buffer-coated optical fiber using urethane acrylate and epoxy acrylate and vinyl monomer
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United States of America Patent
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Sep 18, 1984
Grant Date -
N/A
app pub date -
Dec 28, 1982
filing date -
Dec 28, 1982
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
Radiation-curable coating compositions adapted for application to buffer-coated optical fibers are disclosed. These are intended to apply an adherent topcoat having greater toughness and greater hardness than the buffer coating. The new compositions comprise: (1) from 25% to 70% of diethylenic-terminated polyurethane, which may include urea linkages, the polyurethane being based on a diisocyanate having an average molecular weight of from 400 to 5000; (2) from 5% to 40% of a diethylenically unsaturated ester of a diglycidyl ether of a bisphenol, said ether having a molecular weight up to about 1000; and (3) from 5% to 30% of liquid radiation-curable monoethylenically unsaturated monomer having a T.sub.g above about 55.degree. C., especially N-vinyl pyrrolidone. Ultraviolet cures using acrylates as the ethylenic group are preferred.
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