Stabilized acrylonitrile/styrene/acrylate molding compositions

A thermoplastic molding composition consisting essentially of:

• a) 63.7% by weight of one or more styrene copolymers as component A, wherein component A is a styrene-acrylonitrile copolymer composed of 65% by weight styrene and 35% by weight of acrylonitrile,
• b1) 24.5% by weight of one or more impact-modifying graft rubbers having no olefinic double bond in the rubber phase as component B, wherein component B is an acrylate-styrene-acrylonitrile (ASA) graft polymer with an average particle diameter of from 93 nm, and which comprises from 55 to 80% by weight, based on B, of an elastomerically crosslinked acrylate polymer B1, and from 45 to 20% by weight, based on B, of a graft shell B2 made of styrene and acrylonitrile monomer, wherein component B has a swelling index of 11.6, and wherein the component B1 is composed of
• b11 from 80 to 99.9% by weight, of n-butyl acrylate, and
• b12 from 0.1 to 5% by weight, of dihydrodicyclopentadienyl acrylate,
• b2) 9.8% by weight of one or more impact-modifying graft rubbers having no olefinic double bond in the rubber phase as component BB, wherein component BB is an acrylate-styrene-acrylonitrile (ASA) graft polymer with an average particle diameter of 443 nm, and which comprises from 55 to 80% by weight, based on BB, of an elastomerically crosslinked acrylate polymer BB1, and from 45 to 20% by weight, based on BB, of a graft shell BB2 made of styrene and acrylonitrile monomer, wherein component BB has a swelling index of 13.6, and wherein the component BB1 is composed of
• bb11 from 80 to 99.9% by weight, of n-butyl acrylate, and
• bb12 from 0.1 to 5% by weight, of dihydrodicyclopentadienyl acrylate,
• c) 0.5% by weight of a compound of the formula (I) as component C:
• d) 0.5% by weight of a mixture of the formula (II) as component D:
• f) 1% by weight of one or more additives, selected from the group consisting of dyes, pigments, colorants, antistatic agents, antioxidants, stabilizers for improving thermal stability, for increasing lightfastness, for raising hydrolysis resistance and chemical resistance, agents to counteract decomposition by heat, lubricants, mold release agents, silicone oils, oligomeric isobutylene, where these differ from components C, and Das component F,
• wherein the ratio by weight of component C to component D is in the range from 3:1 to 1:1 and where each of the % by weight values is based on the sum weight of components A, B, BB, C, D, E, and F, and the sum of these values does not exceed 100% by weight, and the thermoplastic molding has a penetration (Nm) as determined in accordance with ISO 6603-2 on plaques (60×60×2 mm), produced to ISO 294 in a mold family at a melt temperature of 260° C. and at a mold temperature of 60° C., after a weathering time of 1500 hrs, of from 11.7 to 13.4.

A thermoplastic molding composition consisting essentially of:

• a) 63.7% by weight of one or more styrene copolymers as component A, wherein component A is a styrene-acrylonitrile copolymer composed of 65% by weight styrene and 35% by weight of acrylonitrile,
• b1) 24.5% by weight of one or more impact-modifying graft rubbers having no olefmic double bond in the rubber phase as component B, wherein component B is an acrylate-styrene-acrylonitrile (ASA) graft polymer with an average particle diameter of from 93 nm, and which comprises from 55 to 80% by weight, based on B, of an elastomerically crosslinked acrylate polymer B 1, and from 45 to 20% by weight, based on B, of a graft shell B2 made of styrene and acrylonitrile monomer, wherein component B has a swelling index of 11.6, and wherein the component B1 is composed of
• b11 from 80 to 99.9% by weight, of n-butyl acrylate, and
• b12 from 0.1 to 5% by weight, of dihydrodicyclopentadienyl acrylate,
• b2) 9.8% by weight of one or more impact-modifying graft rubbers having no olefinic double bond in the rubber phase as component BB, wherein component BB is an acrylate-styrene-acrylonitrile (ASA) graft polymer with an average particle diameter of 443 nm, and which comprises from 55 to 80% by weight, based on BB, of an elastomerically crosslinked acrylate polymer BB1, and from 45 to 20% by weight, based on BB, of a graft shell BB2 made of styrene and acrylonitrile monomer, wherein component BB has a swelling index of 13.6, and wherein the component BB1 is composed of
• bb11 from 80 to 99.9% by weight, of n-butyl acrylate, and
• bb12 from 0.1 to 5% by weight, of dihydrodicyclopentadienyl acrylate,
• c) 0.5% by weight of a compound of the formula (I) as component C:
• t,?
• d) 0.25% by weight of a mixture of the formula (II) as component D:
• t,?
• e) 0.25% by weight of a compound of the formula (III) as component E:
• t,?
• or 0.25% by weight of a compound of the formula (V):
• t,?
• f) 1% by weight of one or more additives, selected from the group consisting of dyes, pigments, colorants, antistatic agents, antioxidants, stabilizers for improving thermal stability, for increasing lightfastness for raising hydrolysis resistance and chemical resistance, agents to counteract decomposition by heat, lubricants, mold release agents, silicone oils, oligomeric isobutylene, where these differ from components C, D, and E, as component F,
• wherein the ratio by weight of component C to component D is in the range from 3:1 to 1:1 and where each of the % by weight values is based on the sum weight of components A, B, BB, C, D, E, and F, and the sum of these values does not exceed 100% by weight, and the thermoplastic molding has a penetration (Nm) as determined in accordance with ISO 6603-2 on plaques (60×60×2 mm), produced to ISO 294 in a mold family at a melt temperature of 260° C. and at a mold temperature of 60° C., after a weathering time of 1500 hrs, of from 11.7 to 13.4.