Impact strength modified polycarbonate compounds

Details Impact strength modified polycarbonate compounds Impact strength modified polycarbonate compounds

C - Chemistry, Metallurgy

08

L

C08L 69/00 (2006.01) C08L 51/04 (2006.01) C08L 51/08 (2006.01)

Patent

CA 2748221

The present invention relates to impact strength modified polycarbonate compounds comprising a first graft polymer based on silicon acrylate composite rubber as a graft basis, wherein the proportion of silicone rubber is 65 - 95 % by weight (relative to the graft basis), a second graft polymer comprising free copolymer, that is, not bonded to the rubber, having a weight-averaged mean molecular weight of 60000 to 150000 g/mol, to the use of the polycarbonate compounds for producing molded parts, and to the molded parts themselves. The compositions and molding compounds according to the invention comprise an optimal combination of good elongation at rupture, good hydrolysis resistance, and low melting viscosity.

La présente invention porte sur des compositions de polycarbonate à résilience modifiée, contenant un premier polymère greffé à base de caoutchouc composite silicone acrylate en tant que base de greffage, la fraction de caoutchouc silicone représentant 65 - 95 % en poids (par rapport à la base de greffage), et un second polymère greffé, lequel contient un copolymère libre, c'est-à-dire non chimique lié au caoutchouc avec une masse moléculaire moyenne en poids de 60 000 à 150 000 g/mole. L'invention porte également sur l'utilisation des compositions de polycarbonate pour la fabrication de corps moulés et sur les corps moulés eux-mêmes. Les compositions et matières moulées de l'invention comprennent une combinaison optimale de bon allongement à la rupture, bonne résistance à l'hydrolyse et faible viscosité à l'état fondu.

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