Flame retardant UV cured buffered optical fibers and buffer composition
AssigneeDsm IP Assets B.V.
InventorsDavid Chase, Kenneth Dake, Kelly Hawkinson, Jack Kelly, Edward Murphy
Life of this patent
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Abstract
An optical fiber comprising a flame retardant UV light-curable tight-buffer coating coated onto the fiber, wherein said tight-buffer coating is substantially halogen-free, and has a limiting oxygen index of at least about 22%, and wherein said tight-buffer coating is removable from said fiber with a strip-force of less than about 1800 grams when the fiber is upjacketed with said coating at a line speed of at least 300 m/min.
Claims46
An optical fiber comprising a flame retardant UV light-curable tight-buffer coating coated onto the fiber, wherein said tight-buffer coating is substantially halogen-free, and has a limiting oxygen index of at least about 22%, and wherein said tight-buffer coating is removable from said fiber with a strip-force of less than about 1800 grams when the fiber is upjacketed with said coating at a line speed of at least 300 m/min.
An optical fiber comprising a flame retardant UV light-curable tight-buffer coating coated on the optical fiber, wherein said tight-buffer coating is substantially halogen-free, and has a limiting oxygen index of at least about 24%, and wherein said tight-buffer coating is removable from said fiber with a strip-force of less than about 1800 grams when the fiber is upjacketed with said coating at a line speed of at least 300 m/min.
An optical fiber comprising a substantially halogen-free flame retardant UV light-curable tight-buffer coating, wherein said fiber has an added signal-loss attenuation of no more than about 0.8 dB/km at 850 nm.
A radiation-curable optical fiber tight-buffer coating composition, comprising, in the uncured state, at least one monomer or oligomer having a radiation-curable functional group and a halogen-free flame-retardant material, wherein said coating composition, when coated onto an optical fiber and cured, has a limiting oxygen index of at least about 22%, and is removable from said optical fiber with a strip-force of less than about 1800 grams when the fiber is upjacketed with said coating at a line speed of at least 300 m/min.
A radiation-curable optical fiber tight-buffer coating composition, comprising, in the uncured state, at least one monomer or oligomer having a radiation-curable functional group and a halogen-free flame-retardant material, wherein said coating composition, when coated onto an optical fiber and cured, has a limiting oxygen index of at least about 24%, and is removable from said optical fiber with a strip-force of less than about 1800 grams when the fiber was upjacketed with said coating at a line speed of at least 300 m/min.
A radiation-curable optical fiber tight-buffer coating composition, comprising, in the uncured state, at least one monomer or oligomer having a radiation-curable functional group, aluminum trihydroxide and a polyarylphosphate, wherein said composition, when applied to an optical fiber and cured at a line speed of at least 300 meters/min, results in a coated optical fiber with a microbend signal-loss attenuation of no more than about 0.8 dB/km at 850 nm and no more than about 0.4 db/km at 1300 db/km, and a strip force of less than about 1800 grams.
A method for making a flame-retardant optical fiber comprising:
- a) providing a tight-buffer coating composition, said tight-buffer coating composition being substantially halogen-free, and when cured, having a limiting oxygen index of at least about 22%, and being removable from said fiber with a strip-force of less than about 1800 grams when the fiber is upjacketed with said coating at a line speed of at least 300 m/min;
- b) applying said tight-buffer composition to an optical fiber;
- and
- curing said tight-buffer composition.
A method for making a flame-retardant optical fiber comprising upjacketing an optical fiber with a tight-buffer coating composition, wherein said tight-buffer coating composition is substantially halogen-free, and when cured, has a limiting oxygen index of at least about 24%, and is removable from said fiber with a strip-force of less than about 1800 grams when the fiber is upjacketed with said coating at a line speed of at least 300 m/min.
A radiation-curable optical fiber tight-buffer composition comprising:
- (A) about 10 wt % to about 70 wt % of a urethane (metha)crylate oligomer, relative to the total weight of said composition, said urethane acrylate oligomer being free of phosphorus-containing urethane (meth)acrylate oligomer;
- (B) about 5 wt % to about 30 wt % of one or more reactive diluents;
- relative to the total weight of said composition;
- (C) about 10 wt % to about 70 wt % of one or more halogen-free flame retardant materials, relative to the total weight of said composition;
- and
- (D) about 0.1 wt % to about 15 wt % of an photoinitiator, relative to the total weight of said composition.
A radiation-curable optical fiber tight-buffer composition comprising:
- (A) about 10 wt % to about 70 wt % of a phosphorous-containing urethane (meth)acrylate oligomer, relative to the total weight of said composition;
- (B) about 5 wt % to about 30 wt % of one or more reactive diluents;
- relative to the total weight of said composition;
- and
- (C) about 0 wt % to about 70 wt % of one or more halogen-free flame retardant materials, relative to the total weight of said composition, wherein said one or more flame retardant materials exclude urethane acrylate phosphorous-based oligomer;
- and
- (D) about 0.1 wt % to about 15 wt % of an photoinitiator, relative to the total weight of said composition.
Dependencies are inferred from the claim text.