MINERAL-FILLED POLYCARBONATE-POLYALKYLENE TEREPHTHALATE COMPOSITION, MOULDING COMPOUND AND MOULDED BODIES WITH GOOD IMPACT TOUGHNESS
The invention relates to a composition for producing a thermoplastic moulding compound, wherein the composition contains the following constituents or consists of same: A) between 50 and 70 wt. % of at least one aromatic polycarbonate, B) between 16 and 40 wt. % of at least one polyalkylene terephthalate, C) between 8 and 22 wt. % of at least one mineral filler based on talc, D) between 0.0110 and 0.0280 wt. % of phosphorous acid, and E) between 0 and 8.0 wt. % of at least one additive. Furthermore, the invention relates to a method for producing a thermoplastic moulding compound from the composition, to the moulding compound itself, and to the use of the composition and the moulding compound for producing moulding bodies.
1 . A thermoplastic molding composition comprising:
A) 50% to 70% by weight of at least one aromatic polycarbonate,
B) 16% to 40% by weight of at least one polyalkylene terephthalate,
C) 8% to 22% by weight of at least one talc-based mineral filler,
D) 0.0110% to 0.0280% by weight of phosphorous acid,
E) 0% to 8.0% by weight of at least one additive.
2 . The composition of claim 1 , wherein component A has a weight-average molecular weight Mw, determined by gel permeation chromatography in methylene chloride using polycarbonate based on bisphenol A as a standard, of 22 to 28 kg/mol.
3 . The composition of claim 1 , wherein component B is selected from the group consisting of polyethylene terephthalates and polybutylene terephthalates.
4 . The composition of claim 3 , wherein component B is a polyethylene terephthalate having an intrinsic viscosity of 0.58 dl/g to 0.68 dl/g is employed as component B.
5 . The composition of claim 1 , wherein component C is a talc having an Al 2 O 3 content of less than 0.7% by weight.
6 . The composition of claim 1 , wherein component C has an upper grain size d 95 of less than 6 μm.
7 . The composition of claim 1 , wherein component D is solid.
8 . The composition of claim 1 , wherein the weight ratio of component D to component B is 0.0003:1 to 0.0010:1.
9 . The composition of claim 1 , wherein the composition does not comprise any fillers or reinforcers other than component C.
10 . The composition of claim 1 comprising:
54% to 66% by weight of component A,
20% to 26% by weight of component B,
12% to 18% by weight of component C,
0.0120% to 0.0220% by weight of the component D,
0.3% to 6% by weight of component E.
11 . The composition of claim 1 consisting of components A to E.
12 . A process for producing a molding compound, wherein the constituents of the composition of claim 1 are mixed with one another at a temperature of 200° C. to 320° C. and subsequently cooled and pelletized.
13 . A molding compound produced by the process of claim 12 .
14 . (canceled)
15 . A molded article produced from the composition of claim 1 .
16 . A molded article produced from the molding compound of claim 13 .