Ultraviolet curable buffer coatings for optical glass fiber...

Details Ultraviolet curable buffer coatings for optical glass fiber... Ultraviolet curable buffer coatings for optical glass fiber...

C - Chemistry, Metallurgy

08

G

402/144, 204/91.

C08G 18/50 (2006.01) C03C 25/10 (2006.01) C08F 283/00 (2006.01) C08G 18/67 (2006.01) C08G 18/75 (2006.01) C08G 18/81 (2006.01)

Patent

CA 1255843

ULTRAVIOLET CURABLE BUFFER COATINGS FOR OPTICAL GLASS FIBER BASED ON LONG CHAIN OXYALKYLENE DIAMINES ABSTRACT An ultraviolet curing liquid coating composition is provided which, when cured with ultraviolet light in the presence of an appropriate photoinitiator, provides a buffer coating for optical glass fiber having adequate strength at room or expected elevated temperature and stability at such elevated temperature, a high index of refraction above 1.48, and a low tensile modulus which remains low to resist microbending difficulties down to around -60°C. This coating composition consists essentially of a linear acrylate-terminated polyurethane oligomer including urea groups introduced by the presence in the oligomer of the reaction product with isocyanate functionality of about 30% to about 90% by weight of the acrylate-terminated oligomer of a polyoxyalkylene diamine having a molecular weight in the range of from about 1000 to about 8000 in which the alkylene group contains from 2-4 carbon atoms.

507427

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