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US 6,187,835 B1Granted
Radiation-curable optical fiber coatings having reduced yellowing and fast cure speed
AssigneeDsm N.V.
InventorsDavid M. Szum, Chander P. Chawla, Timothy E. Bishop
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Abstract
Radiation-curable inner and outer primary optical fiber coatings are disclosed having both fast cure speed and reduced rates of yellowing. The compositions comprise particular photoinitiators and UV absorbers which are used in amounts to provide the combination of properties. The UV absorber can have ethylenic unsaturation. Outer primary coatings can be formulated to screen inner primary coatings and have fast cure speed.
Claims17
A coated optical fiber comprising the combination of:
- an optical fiber
- a radiation-cured inner primary optical fiber coating, and
- a radiation-cured outer primary optical fiber coating,
- wherein said outer primary optical fiber coating comprises, before radiation-cure, the following combination of pre-mixture ingredients:
- about 5 wt. % to about 95 wt. % of at least one radiation-curable urethane acrylate oligomer,
- about 5 wt. % to about 95 wt. % of at least one reactive diluent,
- about 0.1 wt. % to about 20 wt. % of at least one photoinitiator, wherein said photoinitiator is selected to provide a fast cure speed, and
- about 0.1 wt. % to about 20 wt. % of at least one UV absorbing compound which does not substantially impair the fast cure speed of the inner or outer primary coating.
5 more elements
Dependencies are inferred from the claim text.