Patent ID: 11932571
Assignee: COVESTRO (NETHERLANDS) B.V.
Field: Macromolecular chemistry, polymers (Chemistry)
Classification: CPC C  G | IPC C  G

Claim 0:
1. A method for coating an optical fiber, comprising:
providing a glass optical fiber; applying a primary coating composition onto the surface of the glass optical fiber;
optionally, imparting a dose of UV light sufficient to at least partially cure said primary coating composition;
applying a secondary coating composition to the primary coating composition;
exposing the primary coating composition and the secondary coating composition to at least one radiation source capable of emitting ultraviolet radiation to affect curing of said primary coating composition and said secondary coating composition, to form a cured primary coating on the surface of the optical fiber, and a cured secondary coating on the surface of the cured primary coating;
wherein the primary coating composition is a composition comprising:
a reactive oligomer component comprising at least one reactive urethane oligomer comprising a polymerizable group;
wherein at least 20% of a molar fraction of the polymerizable groups in the reactive oligomer component consist of methacrylate groups;
a reactive diluent monomer component comprising monofunctional reactive diluent monomers having at least one polymerizable group that is able to (co)polymerize with the polymerizable group(s) of the reactive oligomer component; wherein the reactive diluent monomer component comprises a monofunctional acrylate monomer;
wherein at least 50% of a molar fraction of the polymerizable groups of the reactive diluent monomer component consist of acrylate groups, acrylamide groups, N-vinyl amide groups, or mixtures thereof;
a photoinitiator component; and
optionally, an additive component.