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AssigneeDSM, N.V., JSR Corporation
InventorsMiyuki Ishikawa, Zen Komiya, Takashi Ukachi
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Provided is a radiation curable resin composition suitable for use as a primary coating material for optical fibers, which can form a cured coating with a low modulus of elasticity exhibiting a high breaking strength, and small light transmission loss; the coating composition comprises (A) a polymer containing polymerizable unsaturated groups in an average amount of 1.2 per molecule, a urethane bond in a molecular chain, and having a number average molecular weight from 3,000 to 30,000, (B) a poly-functional monomer having two or more polymerizable unsaturated groups, (C) a monomer having one polymerizable unsaturated group, and (D) a radiation active initiator. The secant modulus of the coating is less than 0.15 kg/mm2, the tensile strength is more than 0.15 kg/mm2.
A radiation curable resin composition comprising:
A coated optical fiber comprising:
15 The coated optical fiber of claim 14, wherein said coating is formed from a radiation-curable composition comprising:
The coated optical fiber of claim 15, wherein the polymer composition (A) comprises a polyether polyol urethane-based polymer.
The coated optical fiber of claim 15, wherein the polymer composition (A) comprises a polymer derived from a polyoxyalkylene polyether polyol.
The coated optical fiber of claim 15, wherein the polymer composition includes at least one polymer having 2-10 urethane bonds.
The coated optical fiber of claim 15, wherein the radiation-curable compostion comprises, relative to the total radiation-curable composition, between 40 and 70% wt of the polymer composition (A).
The coated optical fiber of claims 15, wherein the poly-functional monomer (B) has a molecular weight of 800 or less.
The coated optical fiber of claim 15, wherein the monomer (C) comprises a polymerizable vinyl group.
The coated optical fiber of claim 15, wherein the radiation-curable composition has a viscosity, at 25° C., of from 1,000 to 20,000 cP.
The coated optical fiber of claim 15, wherein said coating has a viscoelasticity curve having a total of at least one peak and at least one shoulder, or at least two peaks in a temperature range from −50° C. to +35° C. in a temperature dependency curve of loss tangent.
Dependencies are inferred from the claim text.