Coated optical fiber
AssigneeShin-Etsu Chemical Co., Ltd.
InventorsShouhei Kozakai, Masatoshi Asano, Shigeru Konishi, Toshio Ohba
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Abstract
In a coated optical fiber comprising a quartz glass fiber, a primary coating and a secondary coating, the secondary coating is formed by curing a resin composition comprising (A) 20-90 wt % of a polyurethane (meth)acrylate oligomer which is synthesized from an alicyclic polyisocyanate, contains 5-90 wt % of a polyurethane (meth)acrylate oligomer having a Mn of up to 1,000, and has an overall Mn of up to 10,000, and (B) 80-10 wt % of an ethylenically unsaturated compound, with electron beams accelerated at 50-125 kV. The coated optical fiber has a minimized transmission loss.
Claims5
A coated optical fiber comprising a quartz glass fiber, a primary coating thereon and a secondary coating on the primary coating,
- said secondary coating being a cured product of a resin composition comprising
- (A) 20 to 90% by weight of a polyurethane (meth)acrylate oligomer which is synthesized using an alicyclic polyisocyanate as an essential starting reactant, contains 5 to 90% by weight of a polyurethane (meth)acrylate oligomer having a number average molecular weight of up to 1,000, and has an overall number average molecular weight of up to 10,000, and
- (B) 80 to 10% by weight of an ethylenically unsaturated compound,
- the resin composition being cured with electron beams accelerated at a voltage of 50 to 125 kV.
Dependencies are inferred from the claim text.