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US 4,729,803 AGranted
Method of filling a cable with a flooding compound
AssigneeWitco Corporation
InventorsThomas D. Hindman, Thomas J. Roessing, Joseph D. Burkhard
Life of this patent
Estimating the term…
Abstract
A flooding compound for a waterproof communications cable is formed from a heated mixture of 92-94% by weight of a microcrystalline wax, 3-5% polyethylene and 2-4% of a rubber. The heated mixture is extruded between the plastic jacket and core sheath of a cable. The compound exhibits the adhesive and slip characteristics of, and is a replacement for, atactic polypropylene.
Claims6
A method of filling a cable with a flooding compound comprising;
- (a) dissolving a wax soluble rubber in a microcrystalline wax at an elevated temperature between 220.degree. F. to 260.degree. F., said rubber comprising an ethylene-propylene copolymer;
- (b) dissolving polyethylene in the mixture of step (a), and said wax being present in at least 90% by weight;
- (c) extruding the mixture of step (b) at about said elevated temperature, between a metal sheath and a plastic cable covering of said cable, and wherein the extruded mixture has the jacket slip characteristics of atactic polypropylene as defined by the R.E.A. 15 lb. minimum test standard.
A method of filing a cable with a flooding compound comprising;
- (a) dissolving a wax soluble rubber in a microcrystalline wax at an elevated temperature;
- (b) dissolving polyethylene in the mixture of step (a), wherein the wax is present in at least 90% by weight;
- (c) extruding the mixture of step (b) at about said elevated temperature, between a metal sheath and a plastic cable covering of said cable, and wherein the extruded mixture has the jacket slip characteristics of atactic polypropylene as defined by the R.E.A. 15 lb. minimum test standard.
Dependencies are inferred from the claim text.