Moulded plastic parts with a plastic matrix filled with...

C - Chemistry – Metallurgy – 08 – K

Patent

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Details

C08K 3/00 (2006.01) B29B 15/10 (2006.01) B29C 70/64 (2006.01) C08K 9/00 (2006.01)

Patent

CA 2182965

To improve the resistance to scratching of plastic molded articles comprising a polymer matrix filled with inorganic fillers, the filler content being 50 to 90 % by weight in relation to the filled matrix, it is suggested that the filler comprise two filler fractions (a) and (b), wherein the filler fraction (a) has a particle size distribution with 98 % by weight of the particles having a particle size <= 150 µm and is distributed essentially uniformly in the polymer matrix, and wherein the filler fraction (b) comprises particles having a particle size of approximately 300 µm to approximately 3000 µm, wherein the proportion of the filler fraction (b) is approximately 1 to 35 % by weight of the total filler content, and wherein the proportion of the filler fraction (b) in an outer surface layer of the molded article is enriched to at least 30 % by weight in relation to the total mass of the filled matrix.

Afin d'améliorer la résistance aux égratignures de pièces moulées en matière plastique avec une matrice en matière plastique remplie de charges inorganiques, les charges représentant 50 à 90 % en poids de la matrice remplie, la charge comprend deux portions (a) et (b). La portion (a) a une répartition granulométrique telle que 98 % en poids des particules ont une taille égale ou inférieure à 150 mu m et sont uniformément réparties dans la matrice en plastique. La portion (b) comprend des particules d'une taille comprise entre 300 mu m et 3000 mu m environ. La portion (b) représente 1 à 35 % en poids de la teneur totale en charges et est concentrée dans une couche marginale superficielle de la pièce moulée jusqu'à au moins 30 % en poids de la masse totale de la matrice remplie.

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