RUBBER-MODIFIED FLAME-RETARDANT MOLDING COMPOUNDS
The invention relates to thermoplastic molding compositions comprising A) from 55 to 98% by weight of at least one vinylaromatic copolymer impact-modified with a particulate graft rubber, B) from 1 to 44% by weight of a flame retardant comprising B1) an expandable graphite, B2) a phosphorus-comprising flame-retardant compound, and B3) a fluorine-comprising polymer, C) from 1 to 20% by weight of a non-particulate rubber comprising polar groups, and D) from 0 to 40% by weight of further additives, where the percentages by weight are in each case based on the total weight of components A) to D) and give a total of 100% by weight, and also to processes for the preparation of these molding compositions, to the use of these molding compositions for the production of moldings, of fibers, of foams, or of foils, and also to the resultant moldings, fibers, foams, and foils.
1 .- 11 . (canceled)
12 . A thermoplastic molding composition comprising
A) from 55 to 98% by weight of at least one vinylaromatic copolymer impact-modified with a particulate graft rubber,
B) from 1 to 44% by weight of a flame retardant comprising
B1) from 20 to 79.99% by weight of an expandable graphite,
B2) from 20 to 79.99% by weight of a phosphorus-comprising flame-retardant compound, and
B3) from 0.01 to 4% by weight of a fluorine-comprising polymer,
where the percentages by weight are in each case based on the total weight of components B1) to B3) and give a total of 100% by weight, and
C) from 1 to 20% by weight of a non-particulate rubber comprising polar groups, and
D) from 0 to 40% by weight of further additives,
where the percentages by weight are in each case based on the total weight of components A) to D) and give a total of 100% by weight.
13 . The thermoplastic molding composition according to claim 12 , comprising an ethylene-acrylate rubber as component C).
14 . The thermoplastic molding composition according to claim 12 , comprising, as component A), acrylonitrile-styrene-acrylate polymers (“ASA”) and/or acrylonitrile-butadiene-styrene polymers (“ABS”).
15 . The thermoplastic molding composition according to claim 12 , comprising, as component B2), at least one compound selected from inorganic or organic phosphates, phosphites, phosphonates, phosphate esters, red phosphorus, and triphenylphosphine oxide.
16 . The thermoplastic molding composition according to claim 12 , comprising, as component B2), a mixture composed of red phosphorus and of at least one inorganic or organic phosphate, phosphite, phosphonate, phosphate ester, or triphenylphosphine oxide.
17 . The thermoplastic molding composition according to claim 12 , comprising, as component B2), a mixture composed of red phosphorus and ammonium polyphosphate.
18 . The thermoplastic molding composition according to claim 12 , comprising, as component B2), a mixture composed of red phosphorus and ammonium polyphosphate and triphenyl phosphate.
19 . The thermoplastic molding composition according to claim 12 , comprising a fluorinated ethylene polymer as component B3).
20 . A process for the preparation of the thermoplastic molding compositions according to claim 12 , which comprises mixing components A), B), C), and, if present, D) in the melt.
21 . A fiber, a foil, a molding, or a foam obtainable from the thermoplastic molding compositions according to claim 12 .