Coated optical fiber and radiation-curable resin composition
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United States of America Patent
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N/A
Issued Date -
Oct 16, 2003
app pub date -
Feb 25, 2003
filing date -
Aug 15, 1997
priority date (Note) -
Abandoned
status (Latency Note)
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Abstract
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/mm.sup.2, the tensile strength is more than 0.15 kg/mm.sup.2.
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