| 摘要 |
Buffer-coated and overcoated optical glass fiber is disclosed in which the topcoat has the high strength and high tensile modulus combined with good elongation and solvent resistance associated with extruded jacket coatings, but which is applied by ordinary coating procedures and cured by exposure to ultraviolet radiation. The coating compositions which enable this to be achieved comprise 30% to about 80% of linear diethylenic polyester polyurethanes which are the linear polyurethane reaction product of an organic diisocyanate with hydroxy-functional polyester formed by reacting a diol, such as ethylene glycol, with certain dicarboxylic acids, such as adipic acid. This polyurethane is end capped with a monoethylenically unsaturated monohydric alcohol. At least 50% of this diethylenic polyester polyurethane is combined with at least 5% of liquid diethylenic diester of a diglycidyl ether of a bisphenol, and at least 5% of liquid monoethylenically unsaturated monomer having a glass transition temperature above about 55 DEG C., these proportions being based on total reactive components. |
