Water-excluding filling compositions

Details Water-excluding filling compositions Water-excluding filling compositions

H - Electricity

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31/102, 337/47

H01B 13/32 (2006.01) C10M 101/00 (2006.01) C10M 169/00 (2006.01) G02B 6/44 (2006.01) H01B 7/285 (2006.01) H02G 15/00 (2006.01)

Patent

CA 1188500

ABSTRACT This invention relates to hydrophobic mineral oil-based composi- tions and to the use of such compositions as filling compositions particularly for telecommunication cable splice cases. It has been found that filling composition comprising a fluid mineral oil and a hydrophobic fumed silica has excellent water-exclusion properties. Fumed silica can be rendered hydro- phobic by treating its surface, and has excellent properties for use as a hydrophobic filling compound, without having the disadvantages of petrolatum- based compositions generally available. The use of a fumed silica thickener having a hydrophobic surface provides a filling composition having improved water-excluding properties and a very low water content compared to similar compositions containing untreated, hydrophilic fumed silica. Resistance to oil separation can be further improved by the addition of a low molecular weight polymeric thickener which is soluble in the mineral oil: depolymerized butyl rubber is preferred.

403796

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