Filled perfluoropolymers

H - Electricity – 01 – B

Patent

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Details

H01B 3/44 (2006.01) C08K 3/00 (2006.01) C08L 27/18 (2006.01) C08L 27/20 (2006.01) C09D 11/00 (2006.01)

Patent

CA 2554114

The present invention relates to plenum cables jacketed with a composition comprising perfluoropolymer and inorganic char-forming agent, which passes the NFPA-255 burn test, and to preferred compositions for forming the jacket on such cables and other melt-fabricated articles, wherein hydrocarbon polymer is also present in the composition, and to these same compositions which may include other inorganic particulate filler and provide improved ink- printability on the melt-fabricated article surface, and to extrusion conditions, notably extrusion at low temperatures (271~C to 343~C) and at a draw ratio balance less than 1, that enable the cable jacket to be extrusion- formed at a line speed of at least 91.5 m/min.

La présente invention concerne un câble pour vide technique enveloppé d'une composition contenant un perfluoropolymère et un agent inorganique de formation d'une couche superficielle carbonisée, conforme au test de combustion NFPA-255, ainsi que des compositions préférées de formation de l'enveloppe sur lesdits câbles et autres articles fabriqués par fusion. Lesdites compositions contiennent également un polymère d'hydrocarbure, et peuvent contenir d'autres charges particulaires inorganiques, permettant d'obtenir une capacité d'impression supérieure sur la surface de l'article fabriqué par fusion. L'invention concerne également les conditions d'extrusion, notamment l'extrusion à basse température (271 ·C à 343·C) et avec un rapport d'étirage inférieur à 1 permettant à l'enveloppe du câble d'être formée par extrusion à une vitesse linéaire d'au moins 91,5 m/min.

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