Filled optical fiber cables
First Claim
1. A cable comprising one or more optical fibers contained within a sheath leaving voids between the fibers and the sheath, and a filling material at least partially filling the voids, characterized in thatthe filling material comprises a mixture of (1) 85 to 94 weight percent ASTM Type 103, 104A, or 104B, or mixtures thereof, paraffinic or napthenic oil having a minimum specific gravity of 0.855;
- a minimum SUS viscosity at 210 degrees F. of 40; and
a maximum pour point ASTMD 97 of -5 degrees F.; and
a maximum of 5 percent aromatic oils;
(2) from 6 to 15 weight percent of a styrene-ethylene-butylene-styrene block copolymer having a styrene-rubber ratio of approximately 0.2 to 0.5;
with the foregoing ingredients (1) and (2) comprising at least 99 weight percent of said filling material, and further comprising up to 1 weight percent thermal oxidative stabilizer.
3 Assignments
0 Petitions
Accused Products
Abstract
A filling composition comprising a styrene-rubber-styrene block copolymer and an oil is used to prevent water entry into optical fiber cable. The composition provides:
(1) suitably low viscosity to allow filling the cable at elevated temperatures;
(2) low modulus to minimize microbending loss in the optical fibers; and
(3) high slump temperature to minimize flow of the material at an elevated service temperature from the end of a filled cable.
56 Citations
2 Claims
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1. A cable comprising one or more optical fibers contained within a sheath leaving voids between the fibers and the sheath, and a filling material at least partially filling the voids, characterized in that
the filling material comprises a mixture of (1) 85 to 94 weight percent ASTM Type 103, 104A, or 104B, or mixtures thereof, paraffinic or napthenic oil having a minimum specific gravity of 0.855; - a minimum SUS viscosity at 210 degrees F. of 40; and
a maximum pour point ASTMD 97 of -5 degrees F.; and
a maximum of 5 percent aromatic oils;
(2) from 6 to 15 weight percent of a styrene-ethylene-butylene-styrene block copolymer having a styrene-rubber ratio of approximately 0.2 to 0.5;
with the foregoing ingredients (1) and (2) comprising at least 99 weight percent of said filling material, and further comprising up to 1 weight percent thermal oxidative stabilizer. - View Dependent Claims (2)
- a minimum SUS viscosity at 210 degrees F. of 40; and
Specification