STABILIZED MOULDING COMPOUNDS CONSISTING OF POLYAMIDE AND ASA-COPOLYMERS
Thermoplastic molding compositions comprising: 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 B without any maleic anhydride-derived units, c) 3 to 91.8 wt % of one or more impact-modifying grafted rubbers 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) 1 to 25 wt % of one or more styrene copolymers G, h) 1 to 30 wt % of one or more further rubbers, exhibit improved weathering resistance.
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) 3 to 91.8 wt % of one or more impact-modifying grafted rubbers without 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:
where n is 2 to 20,
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):
n=2 to 20
or 0 to 0.9 wt % of a compound of formula (V):
n=2 to 20
or 0 to 0.9 wt % of a compound of formula (VI):
n=2 to 20
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, as component G,
h) 1 to 30 wt % of one or more further rubbers based on olefinic monomers without core-shell construction and with at least 0.1 wt % of functional monomers, as component H,
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
0 to 40 wt % of one or more fibrous or particulate fillers, as component J,
with the proviso that when component E amounts to 0 wt %, at least one of the components of formulae (III), (IV), (V) or (VI) is present in an amount of 0.01 to 0.9 wt %, wherein the wt % are each based on the overall weight of components A to J, and these 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 6 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 acrylate-styrene-acrylonitrile (ASA) graft polymer comprising 55 to 80 wt %, based on C, of an elastomer-crosslinked acrylic ester polymer C1 and 45 to 25 wt %, based on C, of a graft 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 80:20 to 65:35.
5 . The thermoplastic molding composition according to claim 1 , characterized in that C1 comprises from 0.01 to 20 wt %, of a crosslinking monomer.
6 . The thermoplastic molding composition according to claim 1 , characterized in that the average particle diameter of component C is between 50 to 1200 nm.
7 . The thermoplastic molding composition according to claim 1 , characterized in that the weight ratio of components D and E is in the range from 3:1 to 1:1 and the weight ratio of components E and F is in the range from 2:1 to 0.5:1.
8 . The thermoplastic molding composition according to claim 1 , characterized in that component C1 comprises from 2 to 99 wt % of butyl acrylate.
9 . The thermoplastic molding composition according to claim 1 , characterized in that the vinylaromatic component in C2 comprises styrene or α-methylstyrene.
10 . 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 alkyl.
11 . The thermoplastic molding composition according to claim 1 , characterized in that component C comprises a rubber in monomodal or bimodal particle size distribution.
12 . 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.
13 . The thermoplastic molding composition according to claim 1 , characterized in that component G includes from 1.7 to 2.3 wt % of maleic anhydride-derived units.
14 . 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.
15 . The thermoplastic molding composition according to claim 1 , characterized in that component H is a copolymer formed from the following components:
h1) 35 to 89.95 wt % of ethylene, as component h1,
h2) 10 to 60 wt % of 1-octene, 1-butene, propene or mixtures thereof, as component h2, and
h3) 0.05 to 5 wt % of functional monomers, wherein the monomers bear functional groups selected from carboxylic acid, carboxylic anhydride, carboxylic ester, carboxamide, carboximide, amino, hydroxyl, epoxy, urethane or oxazoline groups or mixtures thereof.
16 . A process for producing a thermoplastic molding composition according to claim 1 , comprising the steps of:
mixing components A, B, C, D, G and H and also, optionally, E, F, I and J with one another in any desired order at temperatures of 100 to 300° C. and a pressure of 1 to 50 bar, kneading the mixture, and extruding the kneaded mixture extruded.
17 . A molded article, a fiber or a self-supporting film or sheet comprising a thermoplastic molding composition according to claim 1 .
18 . The thermoplastic molding composition according to claim 1 with the proviso that when component E amounts to 0 wt %, at least one of the components of formulae (III), (IV), (V) or (VI) is present in an amount of 0.1 to 0.8 wt %, wherein the wt % are each based on the overall weight of components A to J, and these add up to 100 wt %.
19 . The thermoplastic molding composition according to claim 1 with the proviso that when component E amounts to 0 wt %, at least one of the components of formulae (III), (IV), (V) or (VI) is present in an amount of 0.2 to 0.8 wt %, wherein the wt % are each based on the overall weight of components A to J, and these add up to 100 wt %.
20 . The thermoplastic molding composition according to claim 5 , characterized in that C1 comprises from 0.1 to 5 wt %, of a crosslinking monomer selected from butylene diacrylate, divinylbenzene, butaynediol dimethacrylate, trimethylolpropane tri(meth)acrylate, diallyl methacrylate, diallyl maleate, diallyl fumarate, triallyl methacrylate, triallyl isocyanurate and mixtures thereof.