Radiation curable coating composition with hydrophobic properties for optical fibers and optical fibers coated thereby

摘要

A radiation curable secondary coating composition for forming a secondary polymeric coating having good hydrophobic properties on a primary polymeric coating on an optical fiber is disclosed. The secondary coating composition is a mixture of a radiation curable composition capable of forming a polymeric coating, such as aliphatic difunctional and trifunctional urethane oligomers, and a hydrophobic agent selected from the group consisting of an aqueous dispersion of negatively charged hydrophobic resin particles, fluoropropylmethylcyclotrisiloxane, fluoropropylmethylsiloxanediol, trifluoropropylsiloxypolydimethylsiloxane, polybutadiene diacrylate and polybutadiene dimethacrylate.