CABLE MAINTENANCE APPARATUS AND METHOD

WIPO Patent Application WO1987006069

A3

Two process (1) and (2A) and (2B) are claimed as is the cpd. in (ii) of process (1). (1) Process for repairing a multi-wire electrical cable after exposure to water resulting in water-bridging comprises (i) opening the outer covering; (ii) distributing granules of a water-swellable, water-insoluble polymer mixed with granules of a lubricating and bond-breaking substances into the interstices for a sufficient time to dry the insulation; (iii) removing the polymer granules; and (iv) restoring the outer covering. The cpd. in (ii) is also claimed. The polymer granules are pref. 50-150 mesh and have attached carboxylate, sulphate, phosphate and/or sulphonate gps. These granules cause no electrochemical heating. The lubricating and bond-breaking substances comprise pref. 70-90 vol.% and are pref. non-silica talc or clay. (2A) Process for electrochemically coating a metallic wire having a positive ionic deposition comprises (a) prepg. a soln. of a polymer having anionic gps. and at least one non-involved cationic substance; (b) placing the wire in the soln.; (c) passing a small DC current through the soln. so that the wire is the anode, and the substance with cations is left in soln. This provides a hydrophobic insulation which is chelated on the wire, with an anionic-cationic linkage established between the polymer and the metal. (2B) Above process is the basis of another claimed process for repairing a cable carrying at least one pair of wires, e.g. telephone wires, which carry a small DC current after a short caused by water. It essentially comprises sprinkling polymer granules having anionic gps. and at least one non-involved cationic substance over isolated and sepd. wires followed by passing a small DC current through the wire.

JPS53118437	METHOD OF MAKING URETHANE BINDER FOR CATODE ELECTRODEPOSITION
JP6719185	Method for preparing cationic electrodeposition coating composition

FREEMAN CLARENCE S (US)
FREEMAN KATHERINE M (US)

PCT/US1987/000565

January 14, 1988

March 23, 1987

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FREEMAN CLARENCE S (US)
FREEMAN KATHERINE M (US)

C09D5/44; C25D13/16; H01B7/00; H01B7/28; H01B7/285; H01B7/288; H01B13/30; H01R43/00; H02G1/00; H02G1/16; H01B; H02G; (IPC1-7): H02G1/16

US3939882A	1976-02-24
US4308416A	1981-12-29
GB2038111A	1980-07-16
US3403089A	1968-09-24
FR1473753A	1967-03-17
GB1146613A	1969-03-26
DE2250042A1	1974-05-02
US4129544A	1978-12-12

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