Flame-retardant polyolefin-type resin composition, method...

C - Chemistry – Metallurgy – 08 – L

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C08L 33/08 (2006.01) C08K 3/22 (2006.01) C08L 23/04 (2006.01) C08L 23/06 (2006.01) C08L 23/08 (2006.01) C08L 31/04 (2006.01) C08L 35/00 (2006.01) H01B 3/46 (2006.01) C08L 83/06 (2006.01)

Patent

CA 2322734

A flame-retardant polyolefin-type resin composition comprising (A) 100 weight parts polyolefin-type resin, (B) 30 to 200 weight parts powder of a hydrated metal compound, and (C) 0.01 to 50 weight parts branched organopolysiloxane with average unit formula R a SiO(4-a)/2 where each R is a selected from the group consisting of monovalent organic groups selected from the group consisting of C1 to C12 alkyl and C6 to C12 aryl and hydroxyl, wherein aryl constitutes from 50 to 100 mole% of the total monovalent organic groups and the hydroxyl content in each molecule is from 1 to 10 weight%, a is a number from 0.75 to 2.5, and the organopolysiloxane contains at least one RSiO3/2 siloxane unit in each molecule, where R is as previously described. The composition is useful as a flame- retardant coating on electrical cables.

Composition de résine polyoléfinique ignifuge, comprenant (A) 100 parties pondérales de résine de type polyoléfine, (B) 30 à 200 parties pondérales de poudre d'un composé de métal hydraté et (C) 0,01 à 50 parties pondérales d'organopolysiloxane ramifié selon une formule unitaire moyenne R a SiO(4-a)/2, dans laquelle chaque R est choisi parmi des groupes organiques monovalents choisis parmi le groupe comportant un alkyle C1 à C12 et un aryle et un hydroxyle C6 à C12, où l'aryle constitue entre 50 et 100 % molaire des groupes organiques monovalents totaux et le contenu d'hydroxyle dans chaque molécule est de 1 à 10 % d'équivalent en poids, variant de 0,75 à 2,5, et l'organopolysiloxane contient au moins une unité de siloxane RSiO3/2 dans chaque molécule, où R est tel que décrit précédemment. La composition sert de revêtement ignifuge sur les câbles électriques.

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