Thermoplastic resin composition

C - Chemistry – Metallurgy – 08 – L

Patent

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Details

C08L 27/12 (2006.01) C08L 27/18 (2006.01) C08L 67/00 (2006.01) C08L 67/02 (2006.01) C08L 67/04 (2006.01)

Patent

CA 2166060

A thermoplastic resin composition comprising a fluoropolymer having a molecular weight of 5x102 to 5x105 and containing 2x102 to 1x105 terminal methylol groups per 1x106 carbon atoms, a liquid crystal polyester, and optionally further a perfluororesin containing less than 2x102 terminal methylol groups per 1x106 carbon atoms. The composition can be improved in dimensional stability represented by molding shrinkage and coefficient of linear expansion without detriment to the characteristics inherent in fluororesins, such as excellent resistances to heat, chemical and weathering, surface characteristics (e.g. nonstickiness and low friction), stainproofness, and electrical insulation.

Composition de résine thermoplastique comprenant un polymère fluoré d'un poids moléculaire de 5x10?2¿ à 5x10?5¿, et contenant de 2x10?2¿ à 1x10?5¿ de groupes méthylol terminaux pour chaque 1x10?6¿ atomes de carbone, un polyester à cristaux liquides, ainsi que, éventuellement, une résine perfluorée contenant moins de 2x10?2¿ groupes méthylol terminaux pour chaque 1x10?6¿ atomes de carbone. On peut améliorer la stabilité dimensionnelle de cette composition, représentée par le niveau de retrait au moulage et le coefficient d'expansion linéaire, sans effets préjudiciables aux caractéristiques inhérentes aux résines fluorées, telles que leur excellente résistance à la chaleur, aux produits chimiques et aux agents atmosphériques, ainsi que leurs caractéristiques de surface (telles que l'absence d'adhérence et le faible coefficient de friction), leur résistance aux taches ainsi que leur capacité d'isolation électrique.

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