Prysmian Cavi E Sistemi Energia S.r.l.

Pirelli & C. S. P. A.

Perelli & C. S.p.a.

Raffaella Donetti

Mauro Maritano

Massimiliano Pavan

Luca Castellani

Lidia Terruzzi

Luigia Rossiello

Diego Tirelli

Andrea Pelizzoni

Emiliano Resmini

Massimo Marini

Elio Ganci

Giacomo Stefano Roba

Cristiano Puppi

Franco Peruzzotti

Stefano Testi

Giovanni Brandi

Sabrina Fogliani

Antonio Campana

Raimondo Scordamaglia

Lisa Grassi

Franco Perruzzotti

Optical fiber has a glass portion and at least one coating of crosslinked polymer material surrounding the glass portion, the coating being obtained by crosslinking a composition of (a) at least one radically crosslinkable oligomer containing at least two reactive functional groups and having a number average molecular weight lower than about 1,000, preferably between about 400 and about 900; (b) at least one cationically crosslinkable compound containing at least one reactive functional group; (c) at least one free radical photoinitiator; and (d) at least one cationic photoinitiator. Preferably, the coating is a secondary coating or, in the case of a ribbon of optical fibers, it is a common polymer coating known as a 'common coating'.

Optical fiber with polymeric coating crosslinked in the presence of both radical and cationic photoinitiators

A method for making a sound-insulating load-bearing floor, includes the following steps: providing a load-bearing floor; applying a sound-insulating material onto the load-bearing floor so as to form a substantially continuous coating layer; allowing the substantially continuous coating layer to dry; wherein the sound-insulating material includes: 40% by weight to 95% by weight, preferably 60% by weight to 90% by weight, with respect to the total weight of the sound-insulating material, of at least one rubber in a subdivided form; 5% by weight to 60% by weight, preferably 10% by weight to 40% by weight, with respect to the total weight of the sound-insulating material, of at least one binding agent including at least one water-dispersible polymer having a glass transition temperature (T) of &#x2212;50&#xb0; C. to +50&#xb0; C., preferably of &#x2212;40&#xb0; C. to +10&#xb0; C.

Method for making a sound-insulating load-bearing floor

A method for making a sound-insulating load-bearing floor, includes the following steps: applying a sound-insulating material over a load-bearing floor as to form a continuous coating layer; allowing the continuous coating layer to harden; applying a covering floor over said hardened continuous coating layer; wherein the sound-insulating material includes: 40% by weight to 95% by weight, preferably 60% by weight to 90% by weight, with respect to the total weight of the sound-insulating material, of at least one rubber in a subdivided form; 5% by weight to 60% by weight, preferably 10% by weight to 40% by weight, with respect to the total weight of the sound-insulating material, of at least one binding agent including: a first, component including at least one organic compound having at least one acid functional group or a derivative thereof, the first component having a Brookfield viscosity, measured at 23&#xb0; C., of 0.1 Pa&#xb7;s to 100 Pa&#xb7;s, preferably 0.2 Pa&#xb7;s to 50 Pa&#xb7;s, more preferably 0.5 Pa&#xb7;s to 20 Pa&#xb7;s; and a second component including at least one metal oxide or hydroxide.

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 having: a) a glass portion; and b) at least one protective coating layer disposed to surround the glass portion, the protective coating layer having a modulus of elasticity value between &#x2212;40&#xb0; C. and +60&#xb0; C. between 5 MPa and 600 MPa, preferably not higher than 500 MPa, more preferably not higher than 450 MPa and much more preferably not higher than 300. Preferably the protective coating layer is a single protective coating layer which is disposed in contact with the glass portion.

Optical fiber with cured polymeric coating

A process for manufacturing a water-resistant telecommunication cable. The cable has a solid and compact element having a water-soluble polymer material having vinyl alcohol/vinyl acetate copolymer having a hydrolysis degree of 60-95% and a polymerisation degree higher than 1,800 and at least one solid low-melting and one solid high melting plasticizers. The process produces continuously the water-soluble polymer material by separately feeding, in sequence, a multi-screw extruder, in the flow direction, with the copolymer and the high melting plasticizer melting and mixing them while transporting them through the extruder, and with the low melting plasticizer, melting and mixing them with the copolymer and the high melting plasticizer, subsequently homogenizing the copolymer and the plasticizers and finally discharging the melt, at a temperature lower than or equal to 205&#xb0; C. A process for extruding the above PVA based water-soluble polymer material. The process allows extrusion of PVA with an enhanced productivity and reproducibility requiring shorter times for absorbing the plasticizers onto the polymer.

Process for manufacturing a water-resistant telecommunication cable

A water-resistant telecommunication cable is disclosed comprising a solid and compact element surrounding at least one optical transmitting element, wherein the element is made from a vinyl alcohol/vinyl acetate copolymer having a hydrolysis degree of about 60% to about 95% and a polymerization degree higher than about 2,500; at least a first solid plasticizer having a melting point between 50&#xb0; and 110&#xb0; C., and a second solid plasticizer having a melting point equal or higher than 140&#xb0; C., in an amount of about 10&#x2013;30 and 1&#x2013;10 parts by weight per hundred parts by weight of the copolymer, respectively; the water-soluble polymer material showing: a complex modulus (G*) equal to or higher than 2.5 10Mpa; a ratio of the viscous modulus to the elastic modulus (tan &#x3b4;) equal to or lower than 2.30; and a glass transition temperature (Tg) of about 20&#xb0; to about 35&#xb0; C.

An optical fiber having at least one epoxidized polyolefin based polymer coating. The coating is formed from a crosslinkable composition having (a) at least one epoxidized polydiene oligomer having a first and a second end, the oligomer having at least one hydrocarbon chain that is substantially free of ethylenic double bonds, at least one epoxide group at the first end and at least one reactive functional group at the second end; (b) at least one hydrogenated polydiene oligomer having at least one reactive functional group capable of reacting with the epoxide groups; and (c) at least one photo-initiator. Preferably, the coating is a primary coating coated with a secondary coating.

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Ghemme, Italy

Raffaella Donetti