High tracking index liquid crystalline polymers and related...

C - Chemistry – Metallurgy – 09 – K

Patent

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Details

C09K 19/38 (2006.01) C08K 3/22 (2006.01) C08K 7/00 (2006.01) C08K 11/00 (2006.01) C08L 67/00 (2006.01) C09K 19/52 (2006.01) C09K 21/14 (2006.01) C08G 63/60 (2006.01)

Patent

CA 2410570

Excellent tracking index as well as flame-resistant properties are achieved with other desirable characteristics of LCPs in a resin composition consisting essentially of: a) a wholly aromatic polyester which is melt processible and which displays anisotropy in the molten state; b) a non-conductive filler material having a diameter of less than about 3 m, with said non-conductive filler material being present in an amount sufficient to increase the comparative tracking index (CTI) rating of said composition to above 220 volts and render the composition non-burning. Optionally, an extraordinarily small amount of non-volatile fluorescent brightener can be added to the resin composition. In combination with the non-conductive filler, the fluorescent brightener is found to surprisingly and significantly improve the flame- retardant property of the resin.

La présente invention concerne une composition de résine se distinguant par les bonnes caractéristiques de ses polymères cristaux liquides, notamment en ce qui concerne le coefficient de cheminement et l'inflammabilité. En l'occurrence, cette composition de résine est constituée essentiellement d'un polyester totalement aromatique (a) et d'un matériau de comblement non conducteur (b). Le polyester totalement aromatique (a) se prête au traitement à l'état fondu, état dans lequel il est anisotrope. Le matériau de comblement non conducteur (b), dont le diamètre particulaire moyen reste inférieur à environ 3?m, est présent en une proportion suffisante pour augmenter le coefficient de cheminement comparatif de la composition au-dessus des 220 volts, et rendre ininflammable la composition. On peut éventuellement ajouter à la composition une infime quantité d'azurant optique fluorescent non-volatil. Associé au matériau de comblement non conducteur, l'azurant optique fluorescent s'avère améliorer de façon surprenante et importante les qualités d'inflammabilité de la résine.

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