Coating composition for optical fiber

Details Coating composition for optical fiber Coating composition for optical fiber

1998-04-24

2000-05-02

Berman, Susan W.

Stock material or miscellaneous articles

Coated or structually defined flake, particle, cell, strand,...

Rod, strand, filament or fiber

522 97, 528 65, C08F 250, D02G 300, C08G 1810

Patent

active

060570342

ABSTRACT:
In the coating composition for a optical fiber of the present invention, a polyurethane (meth)acrylate oligomer (A), which is based on a urethane prepolymer having an equivalent ratio of NCO group in a polyisocyanate (a) to OH group in a polyol (b) of more than 3.0, is used and the oligomer (A) has a mixing weight ratio of an oligomer (d) having a number average molecular weight of 800 or less to an oligomer (e) having a number average molecular weight of 1,000 or more of 30/70-70/30.
The coating composition of this invention has a low viscosity, and therefore, is suitable for a rapid fiber-drawing in a production of an optical fiber. Further, a cured material obtained from the coating composition of the present invention has both a high elastic modulus and a high elongation, which properties are required for a hard material, and has a slight change of elastic modulus with a change of temperature to improve a long-term reliability of an optical fiber.

REFERENCES:
patent: 4902440 (1990-02-01), Takeyama et al.
patent: 5496870 (1996-03-01), Chawla et al.

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