Optical fiber buffer coated with halogenated dihydroxy-terminate

Details Optical fiber buffer coated with halogenated dihydroxy-terminate Optical fiber buffer coated with halogenated dihydroxy-terminate

1984-05-21

1986-02-25

Kendell, Lorraine T.

Stock material or miscellaneous articles

Composite

Of bituminous or tarry residue

428375, 428392, G02B 516

Patent

active

045726108

ABSTRACT:
A radiation-curable diethylenically unsaturated polyurethane resin is disclosed which cures to provide cured coatings possessing reasonable physical integrity at room temperature, a tensile modulus of less than about 10000 psi at -40.degree. C., preferably less than 5000 psi at -60.degree. C., and a high index of refraction, above 1.48. This polyurethane resin is constituted by an essentially saturated, halogenated, dihydroxy-terminated linear liquid polybutadiene polymer, in which the halogen is preferably chlorine, reacted with an organic diisocyanate and a monoethylenically unsaturated monomer carrying a single hydroxy group to form a diethylenic diurethane having a halogen-containing essentially saturated polybutadiene backbone. Coating compositions are disclosed which consist essentially of the above diethylenically unsaturated diurethane having a polybutadiene backbone together with less than 40% of a liquid solvent therefor which is preferably a monoethylenically unsaturated liquid having a low glass transition temperature, and the compositions preferably include a photoinitiator enabling cure on ultraviolet exposure. These coatings are used as a buffer coating on optical glass fiber.

REFERENCES:
patent: 3962514 (1976-06-01), Rittler
patent: 4472019 (1984-09-01), Bishop et al.

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