Optical cable components

G - Physics – 02 – B

Patent

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Details

G02B 6/44 (2006.01) C08L 23/12 (2006.01) C08L 23/14 (2006.01)

Patent

CA 2497238

This invention is directed to optical cable components fabricated from an extrudable blend of high crystalline polypropylene and an impact modifying polymer to provide an enhanced balance flexural modulus, Izod notched value, grease resistance, and low shrinkage properties. The polypropylene has a crystallinity of greater than 56 weight percent and a melt flow of from 1 to 20 grams per 10 minutes at 230 degree C. At 23 degrees C, the composition yields an extrudant having a 1-percent secant modulus of at least 1,600 MPa and a notched Izod of at least 35 J/m. The composition also yields an extruded tube having a shrinkage of less than 2.0 percent after 24 hours at 100 degrees C. One example of the impact modifying polymer is an ethylene/1-octene polyethylene copolymer.

La présente invention concerne des composantes de câble optique fabriquées à partir d'un mélange extrudable de polypropylène hautement cristallin et d'un polymère modificateur de la résistance au choc permettant d'obtenir un meilleur équilibre en termes de module d'élasticité en flexion, de résistance au choc Izod entaillé, de résistance à la pénétration des graisses et de faibles coefficients de retrait. Le polypropylène utilisé a une cristallinité supérieure à 56 % en masse et un indice de fluidité compris entre 1 et 20 g/10 min. à 230 ·C. A 23 ·C, la composition produit un extrudat ayant un module sécant 1 % d'au moins 1'600 Mpa et une résistance au choc Izod entaillé d'au moins 35 J/m. La composition permet également de produire un tube extrudé ayant un coefficient de retrait inférieur à 2,0 % après 24 heures à 100 ·C.

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