Submarine optical cable with water-blocking filling composition
AssigneePrysmian Cavi E Sistemi Energia S.R.L.
InventorsClaudio Bosisio, Massimillano Pavan, Mauro Maritano
Life of this patent
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Abstract
Optical cable, in particular for submarine connections. A water blocking resin filling composition of reduced hardness is disposed into interstices. Preferably, the resin composition is a polyurethane resin having less than about 35% by weight of a polyol/polyisocyanate mixture and about 60% to about 90% by weight of a mineral oil. The polyurethane resin preferably has less than about 12% by weight of a coupling agent. The cable has an optical core surrounded by a plurality of metallic wires and an outer polymeric sheath. The optical core is of the “tight” type with a plurality of optical fibers embedded into a polymeric matrix disposed around a strength member.
Claims14
Optical cable comprising:
- an outer sheath;
- an optical core disposed within said outer sheath, said optical core comprising at least one optical fiber housed therein;
- at least one longitudinal cavity disposed along and in contact with said optical core;
- wherein
- said at least one longitudinal cavity is at least partially filled with a resin material having a needle penetration higher than about 200 l/10 mm, measured according to ASTM D 5-65.
Optical cable comprising:
- an outer sheath;
- an optical core disposed within said outer sheath, said optical core comprising at least one optical fiber housed therein;
- at least one longitudinal cavity disposed along and in contact with said optical core;
- wherein
- said at least one longitudinal cavity is at least partially filled with a polyurethane resin obtainable from a liquid curable composition comprising less than about 35% by weight of a polyol/polyisocyanate mixture and from about 65% to about 90% by weight of a mineral oil.
Dependencies are inferred from the claim text.