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US 4,259,540 AGranted
Filled cables
AssigneeBell Telephone Laboratories, Incorporated
InventorRaffaele A. Sabia
Life of this patent
Estimating the term…
Abstract
An improved filling material having superior handling characteristics and useful for waterproofing electrical cables is disclosed. The material is a styrene-ethylene butylene styrene block copolymer dissolved in a naphthenic or paraffinic oil, with polyethylene added for consistency.
Claims8
A cable comprising:
- a plurality of conductors contained within a sheath leaving voids between the conductors, and between the conductors and the sheath, and a filling material filling the voids the invention characterized in that the filling material comprises a mixture of:
- (X) an ASTM Type 103, 104A or 104B, or mixtures thereof, (paraffinic or naphthenic) oil, having a minimum sp. gr. of 0.860, a minimum SUS viscosity at 210 degrees F. of 45, a maximum pour point ASTM D 97 of 20 degrees F. and a maximum of 5 percent aromatic oils,
- (Y) a styrene-ethylene butylene-styrene block copolymer having a styrene-rubber ratio of approximately 0.2 to 0.5,
- (Z) polyethylene having a softening point of 110 degrees C. to 130 degrees C.
- the ingredients X, Y and Z having relative proportions falling within the shaded area bounded by ABCDEF of the FIGURE.
2 more elements
An encapsulating compound comprising a mixture of:
- (X) an ASTM Type 103, 104A or 104B, or mixtures thereof, (paraffinic or naphthenic) oil, having a minimum sp. gr. of 0.860, a minimum SUS viscosity at 210 degrees F. of 45, a maximum pour point ASTM D 97 of 20 degrees F. and a maximum of 5 percent aromatic oils,
- (Y) a styrene-ethylene butylene-styrene block copolymer having a styrene-rubber ratio of approximately 0.2 to 0.5,
- (Z) polyethylene having a softening point of 110 degrees C. to 130 degrees C.,
- the ingredients X, Y and Z having relative proportions falling within the shaded area bounded by ABCDEF of the FIGURE.
1 more element
Dependencies are inferred from the claim text.