Optical fiber cable provided with stabilized waterblocking mater

Details Optical fiber cable provided with stabilized waterblocking mater Optical fiber cable provided with stabilized waterblocking mater

1992-11-30

1994-02-08

Lee, John D.

Optical waveguides

Optical transmission cable

Loose tube type

252194, 252304, 385141, 523173, G02B 644

Patent

active

052855139

ABSTRACT:
A cable of this invention includes a core comprising a plurality of coated optical fibers and a filling composition of matter which is disposed about the fibers. Typically, the fibers and the filling material are diposed within a tubular member which is disposed within a sheath system. The sheath system include longitudinally extending strength members and a plastic jacket. The filling composition which fills interstices in the core is one which includes an oil constituent which is a relatively high molecular weight aliphatic hydrocarbon. The aliphatic hydrocarbon is a synthetic oil such as polyalphaolefin or mineral oil. A relatively large percent by weight of an antioxidant system is used to prevent thermal oxidative degradation of the filling material as well as of materials in contact with the filling material. Advantageously, for stabilization and metal deactivation, the composition includes zinc dialkyldithiophosphate or diaryldithiophosphate. A styreneethylene propylene copolymer is also included in order to reduce oil separation of the filling material. A fumed silica is used to impart gel properties to the material.

REFERENCES:
patent: 4701016 (1987-10-01), Gartside, III et al.
patent: 4803244 (1989-02-01), Umpleby
patent: 4826278 (1989-05-01), Gartside, III et al.
patent: 4836640 (1989-06-01), Gartside, III et al.
patent: 4844575 (1989-07-01), Kinard et al.
patent: 5187763 (1993-02-01), Tu

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