Objects formed by injection molding of molding compositions comprising: (a) 10 to 80 parts by weight of at least one aromatic polycarbonate resin; (b) 90 to 20 parts by weight of a mixture of (b1) 20-99% by weight of a graft copolymer with a rubbery graft base and (b2) 80-1% by weight of a copolymer of (b2i) styrene, alpha-methyl styrene, methyl methacrylate or a mixture thereof and (b2ii) acrylonitrile, methacrylonitrile, maleic anhydride, N-substituted maleimide or a mixture thereof and (c) per 100 parts of (a) and (b) together 2-25 parts by weight of talc. By choosing a talc with a mean particle size between 1.5 and 20 micrometers one obtains objects with a mat surface appearance. The dullness of the surface can further be increased by using a graft copolymer with a relatively low grafting efficiency of 0.5 to 50%.
1. Thermoplastic molding compounds containing A. 5 to 95 parts by weight of an aromatic polycarbonate, B. 1 to 50 parts by weight of a vinyl copolymer and C. 5 to 95 parts by weight of one or more graft polymers obtained by graft polymerization, characterized in that 10 to 100% of component A is replaced by a mixture of two polycarbonates A.1 and A.2 of identical structure, 1) the relative solution viscosity of A.1 being 1.18 to 1.24, 2) the relative solution viscosity of A.2 being 1.24 to 1.34 and 3) the difference between the relative solution viscosities of A.1 and A.2 being greater than or equal to 0.06
A polycarbonate composition containing inorganic material with an anisotropic particle geometry and with an iron content of less than about 100 ppm is disclosed. The composition is suitable for producing molded articles exhibiting improved mechanical properties both at ambient and low temperatures.
A thermoplastic molding composition containing talc is disclosed. The composition wherein talc has a median particle size of less than 1000 nm further contains a polycarbonate and/or polyester-carbonate, and a graft polymer having as graft base a rubber having a glass transition temperature of below about 10.degree. C. is suitable for preparing molded articles having improved mechanical properties, such as weld line strength, elongation at break and toughness at low temperatures.
A thermoplastic composition contains a polycarbonate resin, an aromatic vinyl copolymer, an impact modifier and a mineral filler, wherein the composition has a lightness L* of greater than or equal to about 70 under one or more of CIE D.sub.65, CWF-2 or C illumination using a 2.degree. observer at 360 to 750 nanometers (nm), including specular components. Alternatively, a thermoplastic composition may contain a polycarbonate resin, a vinyl aromatic copolymer, an impact modifier and a mineral filler, and less than or equal to about 400 parts per million iron, by weight of the composition. An article may be formed by molding, extruding, shaping or forming such a composition to form the article.
Blends of (a) a carbonate polymer component and (b) a monovinylidene aromatic copolymer component not containing a grafted rubber polymer component and (c) an inorganic filler component are prepared having improved combinations of processability, resistance to linear thermal expansion and low temperature toughness. Specifically shaped, small particle size fillers (c) are preferably employed which provide the resistance to linear thermal expansion and maintain the impact resistance of the filled blend.
