Pirelli Cavi S.p.a.

Pirelli Cavi E Sistemi S.p.a.

Prysmian Cavi E Sistemi Energia S.r.l.

Societa Cavi Pirelli S.p.a.

Antonio Campana

Claudio Bosisio

Mauro Maritano

Antonio Zaopo

Massimiliano Pavan

Raffaella Donetti

Raimondo Scordamaglia

Telecommunication cable having an elongated element housing at least one transmitting element. The elongated element has a water-soluble polymeric composition of a vinyl alcohol/vinyl acetate copolymer having a saponification degree of about 60% to about 95%; a plasticizer; a hydrolysis stabilizer compound having a chelant group having two hydrogen atoms bonded to two respective heteroatoms selected from nitrogen, oxygen and sulfur. The two hydrogen atoms have a distance between each other of 4.2&#xd7;10m to 5.8&#xd7;10m. The stabilizer compound is present in an amount of at least 0.75 mmoles per 100 g of copolymer. The elongated element is in particular a buffer tube housing a plurality of optical fibers. The presence of the stabilizer reduces the increase of the hydrolysis degree of the copolymer upon aging, thus maintaining the desired water blocking properties of the copolymer.

Water-resistant telecommunication cable

An optical fiber cable having improved compatibility with a waterblocking filling composition is provided. In particular, the optical fiber cable has a cable component, wherein an optical fiber can be housed, such as a buffer tube or a slotted core, made of a polyolefinic material having high compatibility with a waterblocking filler disposed therein. The cable component is manufactured by employing a suitable polyolefinic material, polyethylene in particular, having a density in the finished component of at least 0.940 g/ml, preferably of about 0.942 g/ml or higher, up to about, e.g., 0.975. The material preferably has a melt flow index (MFI) at 190 &deg; C. and 2.16 kg lower than about 3 and a shear sensitivity of the same, a shear sensitivity higher than about 40.

Optical fiber cable with components having improved compatibility with waterblocking filling compositions

A hydrogen-absorbing composition for optical fiber cables comprises a catalyst selected from the group including the transition metals, their salts and organic and inorganic complexes, and a hydrocarbon compound including at least 90% of a substantially homogeneous, silicon-free hydrocarbon not obtained by polymerization of monomers including conjugate dienes and having double bonds reactive to hydrogen at room temperature in a corresponding amount to an iodine number in the 70 to 1,000 mg/g range; a viscosity in the 500 to 70,000 cSt range at room temperature, and a viscosity at room temperature lower than 70,000 cSt after ageing by exposure to air, in thin layer, for at least 7 days at 100.degree. C. Fiber optic cables according to the invention comprise at least one optical fiber received in a respective housing and, in at least an internal volume portion, an effective amount of said hydrogen-absorbing composition.

Hydrogen-absorbing composition for optical fiber cables and optical

The optical fibre element comprises at least one optical fibre housing constituted by a polyolefin material having at least one additive which protects it against degradation due to oxidation, heat or the proximity of metals, and (b) at least one H.sub.2 -absorbing buffer. The additive is selected from the group comprising anti-oxidants, stabilizers and metal deactivators which cause a reduction in the hydrogen absorption capacity of less than 30% in the, or each, H.sub.2 -absorbing buffer when the, or each, buffer has been in contact with said polyolefin containing the, or each, additive for 30 days at 100.degree. C. in an air atmosphere saturated with water vapor at 150 mbar.

Optical fibre element comprising an optical fibre housing constituted by

The optical fiber element comprises at least one layer of coating constituted by a polyacrylate reticulated by UV radiation and at least one H.sub.2 -absorbing buffer, said polyacrylate comprising at least one photo-initiator of UV reticulation possibly together with an activator for it wherein said photo-initiator and its activator, if any, are selected from the group which comprises those photo-initiators and those activators which cause a reduction in the hydrogen absorption capacity of less than 30% in a H.sub.2 -absorbing buffer which has been in contact with said polyacrylate containing them for 30 days at 100.degree. C. in an air atmosphere saturated with water vapor at 150 mbar.

Optical fibre element comprising a polyacrylate coating layer

An optical fibers cable and the relative components comprise a barrier mixture, to protect the optical fibers, comprising (a) at least a silicon unsaturated organic compound having more than 0.2 mmoles of unsaturated groups per 100 g of said compound, (b) at least a catalyst selected from the group comprising inorganic and organic complexes of transition metals and organic salts of transition metals; said barrier mixture is a further object of the invention and consists of an homogeneous phase.

Optical fiber cables and components thereof containing an homogeneous

An optical fibers cable and the relative components comprise a barrier mixture to protect the optical fibers; the barrier mixture is a further object of the invention and consists of an homogeneous phase comprising (a) at least a silicon unsaturated organic compound having more than 0.2 mmoles of unsaturated groups per 100 g of the compound, (b) at least a catalyst selected from the group comprising inorganic and organic complexes of transition metals and organic salts of transition metals, and (c) at least an organic solvent substantially non-volatile.

A paper-polymeric material, laminated tape, an electric cable insulated with such tape and a method of making the tape. The tape includes a film of polymeric material to at least one surface of which a paper tape comprising cellulose fibers is bonded by contacting the paper tape at room temperature with the film heated to a temperature above its melting temperature. Prior to contacting the paper tape with the heated film, fibrils are caused to project from at least one surface of the paper tape by subjecting it to a high voltage, electrostatic field. In the laminated tape, the fibrils are embedded in the material of the film to provide an improved bond between the film and the paper tape.

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Milan, Italy

Antonio Campana