Ultraviolet curable coatings for optical glass fiber based...

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

C - Chemistry, Metallurgy

08

G

402/131, 400/551

C08G 18/81 (2006.01) B29D 11/00 (2006.01) C03C 25/10 (2006.01) C08G 18/50 (2006.01) C08G 18/67 (2006.01) C08G 18/78 (2006.01) C08G 18/79 (2006.01)

Patent

CA 1270090

ULTRAVIOLET CURABLE COATINGS FOR OPTICAL GLASS FIBER BASED ON A POLYFUNCTIONAL CORE ABSTRACT An ultraviolet curing liquid coating composition which, when cured with ultraviolet light in the presence of an appropriate photoinitiator, provides a coating adapted for the coating of optical glass fiber. This coating composition comprises as the essential component, an acrylate-terminated polyurethane oligomer based on a polyfunctional core which is at least trifunctional and which supports one branch for each functionality in the core. Each of the branches leads to an acrylate-functional terminal group, with there being from about 150 to about 2500 units of molecular weight in each branch between the trifunctional core and the acrylate-functional terminal group. Depending primarily upon the molecular weight of the branches, one can provide coating compositions for buffer coat, single coat or topcoat use.

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