STABILIZED POLYAMIDE/ABS MOLDING MASSES
Thermoplastic molding compositions comprising the following components: a) 3 to 91.8 wt % of a polyamide, as component A b) 3 to 91.8 wt % of a styrene copolymer, as component B c) 5 to 91.8 wt % of an impact-modifying grafted rubber, as component C d) 0.2 to 1.5 wt % of a compound of formula (I), as component D: e) 0 to 0.9 wt % of a mixture of formula (II), as component E: f) 0 to 0.9 wt % of a further stabilizer component F, g) 0 to 25 wt % of one or more styrene copolymers which include from 0.5 to 5 wt % of maleic anhydride-derived units, as component G, and also optionally further added-substance materials, have advantageous weathering properties.
1 . A thermoplastic molding composition comprising the following components:
a) 3 to 91.8 wt % of at least one polyamide, as component A
b) 3 to 91.8 wt % of one or more styrene copolymers without any maleic anhydride-derived units, as component B
c) 5 to 91.8 wt % of one or more impact-modifying grafted rubbers with olefinic double bonding in the rubber phase, as component C
d) 0.2 to 1.5 wt % of a compound of formula (I), as component D:
e) 0 to 0.9 wt % of a mixture of formula (II), as component E:
f) 0 to 0.9 wt % of a compound of formula (III), as component F:
or 0 to 0.9 wt % of a compound of formula (IV):
or 0 to 0.9 wt % of a compound of formula (V):
or 0 to 0.9 wt % of a compound of formula (VI):
g) 1 to 25 wt % of one or more styrene copolymers which, based on overall component G, include from 0.5 to 5 wt % of maleic anhydride-derived units,
h) 0 to 40 wt % of one or more further rubbers,
i) 0 to 40 wt % of one or more added-substance materials other than components D, E, F, G, and H, as component I, and
j) 0 to 40 wt % of one or more fibrous or particulate fillers, as component J,
with the proviso that when component E amounts to precisely 0 wt %, component F amounts to 0.01 to 0.9 wt % of one or more of compounds III, IV, V or VI, wherein the weight % are each based on the overall weight of components A to J and add up to 100 wt %.
2 . The thermoplastic molding composition according to claim 1 , characterized in that the swelling index of component C is in the range from 7 to 20.
3 . The thermoplastic molding composition according to claim 1 , characterized in that component B comprises a copolymer of acrylonitrile, styrene and/or α-methylstyrene, phenylmaleimide, methyl methacrylate or mixtures thereof.
4 . The thermoplastic molding composition according to claim 1 , characterized in that component C comprises a mixture of an acrylonitrile-butadiene-styrene (ABS) graft polymer comprising 50 to 80 wt %, based on C, of an elastomer-crosslinked butadiene polymer B1 and 50 to 20 wt %, based on C, of a grafted sheath C2 formed from a vinylaromatic monomer and one or more polar, copolymerizable, ethylenically unsaturated monomers, optionally a further copolymerizable, ethylenically unsaturated monomer in a weight ratio of from 85:15 to 65:35.
5 . The thermoplastic molding composition according to claim 1 , characterized in that the average particle diameter of component C is between 50 to 800 nm.
6 . The thermoplastic molding composition according to claim 1 , characterized in that components D:E are used in a weight ratio of from 4:1 to 0.25:1.
7 . The thermoplastic molding according to claim 1 , characterized in that the vinylaromatic component in C2 comprises styrene or α-methylstyrene.
8 . The thermoplastic molding composition according to claim 1 , characterized in that the ethylenically unsaturated component in C2 comprises acrylonitrile and/or alkyl methacrylates and/or alkyl acrylates having C 1 -C 8 alkyls.
9 . The thermoplastic molding composition according to claim 1 , characterized in that component C comprises a rubber which has a bimodal particle size distribution.
10 . The thermoplastic molding composition according to claim 1 , characterized in that component G includes from 1.0 to 2.5 wt % of maleic anhydride-derived units.
11 . The thermoplastic molding composition according to claim 10 , characterized in that component G includes from 1.7 to 2.3 wt % of maleic anhydride-derived units.
12 . The thermoplastic molding composition according to claim 1 , characterized in that component A includes from 0.05 to 0.5 wt % of triacetonediamine (TAD) end groups.
13 . A process for producing thermoplastic molding compositions according to claim 1 , characterized in that components A, B, C, D and G, and also optionally E, F, H, I and J are mutually mixed with one another in any desired order at temperatures of 100 to 300° C. and a pressure of 1 to 50 bar, then kneaded and extruded.
14 . The process of claim 13 wherein the thermoplastic molding composition produced is a molded article, a self-supporting film and a self-supporting sheet or a fiber.
15 . A molded article, a fiber or a self-supporting film or sheet comprising of a thermoplastic molding composition according to claim 1 .
16 . The thermoplastic molding composition according to claim 1 , with the proviso that when component E amounts to precisely 0 wt %, component F amounts to 0.1 to 0.9 wt % of one or more of compounds III, IV, V or VI, wherein the weight % are each based on the overall weight of components A to J and add up to 100 wt %.
17 . The thermoplastic molding composition according to claim 1 , with the proviso that when component E amounts to precisely 0 wt %, component F amounts to 0.2 to 0.9 wt % of one or more of compounds III, IV, V or VI, wherein the weight % are each based on the overall weight of components A to J and add up to 100 wt %.