Novel optical fiber gel fluid

Inactive Publication Date: 2002-01-10
SILVERSTEIN ROBERT
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Compatibility of a polymer gel system in flooded cable designs can have a serious effect on cable lifetime and reliability.
Although polyolefins can lead to improvements in cable performance and reduced cost, they may not be compatible with many traditional, low cost polyolefin and hydrocarbon-based cable gel compounds.
However, costs are high compared to conventional mineral base oils.
1-Decene is expensive and costs about three times more than ethylene making PAO very expensive.
Compared to waterblocking gels based on mineral oils, however, these gels are even more expensive, which decreases the cost savings associated with use of polyolefins such as polypropylene for buffer tube applications.
While the known water resistant optical cable gel fluids possess some unique features, they are expensive and not completely suitable for many potential applications.

Method used

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Embodiment Construction

[0010] The present invention provides a novel optical fiber cable gel for use with fiber optic elements. The gels are made from fluids of high molecular weight ethylene-alpha-olefin polymers produced by polymerization of ethylene, an alpha-olefin different from ethylene, and optionally a third monomer different from the alpha-olefin and having 3 to 20 carbon atoms, in the presence of a combination catalyst comprising a compound of a transition metal of Group IVb of the Periodic Table and an aluminoxane. The copolymer or terpolymer may be further processed by thermal cracking to yield novel cracked polymers, and the cracked polymers may be hydrogenated. The copolymers or terpolymers may also be hydroisomerized.

[0011] The ethylene-alpha-olefin polymers useful in the practice of the present invention are those having a low pour point, less than about -30.degree. C. and a relatively high molecular weight, such as greater than 700, preferably greater than 1000, more preferably greater th...

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Abstract

A novel optical fiber gel fluid is provided.

Description

[0001] This application claims priority from U.S. Provisional Application Ser. No. 60 / 187,459, filed Mar. 6, 2000, currently pending.[0002] The present invention generally relates to a novel optical fiber gel fluid. More particularly the present invention relates to an optical fiber gel fluid comprising ethylene-alpha-olefin copolymers.BACKGROUND OF THE PRESENT INVENTION[0003] In providing cushioning of the fiber optic elements which are carried in a jacket or sheath, care must be taken to assure that the optical qualities of the fiber optic elements are not diminished. It is desirable for buffer tube as well as cable jacket polymer and waterblocking gels to have as little interaction as possible. Compatibility of a polymer gel system in flooded cable designs can have a serious effect on cable lifetime and reliability. Since 1995, polypropylene and polyethylene buffer tubes have become increasingly attractive from an application and installation standpoint.[0004] Although polyolefin...

Claims

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Application Information

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IPC IPC(8): G02B6/44
CPCG02B6/032Y10T428/2933G02B6/4494G02B6/44384
InventorSILVERSTEIN, ROBERT
OwnerSILVERSTEIN ROBERT