Topcoats for buffer-coated optical fiber

Details Topcoats for buffer-coated optical fiber Topcoats for buffer-coated optical fiber

G - Physics

02

B

117/195, 400/515

G02B 6/02 (2006.01) C08F 299/02 (2006.01) C08F 299/06 (2006.01) C09D 4/06 (2006.01)

Patent

CA 1201840

TOPCOATS FOR BUFFER-COATED OPTICAL FIBER ABSTRACT Radiation-curable coating compositions adapted for application to buffer-coated optical fibers are disclos- ed. 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 molecu- lar 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 Tg above about 55°C., especially N-vinyl pyrrolidone. Ultraviolet cures using acrylates as the ethylenic group are preferred.

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