Patent ID: 6380306
Filing Date: 2002-04-30
Classification: C08L

Abstract:
A thermoplastic molding material containing, based on the total weight of the molding material,A) from 72 to 88.5% by weight of a thermoplastic polymer of, based on A), a1) from 50 to 100% by weight of styrene or &agr;-methylstyrene or mixtures thereof, a2) from 0 to 50% by weight of acrylonitrile and a3) from 0 to 50% by weight of one or more further mono-ethylenically unsaturated monomers, B) from 10 to 20% by weight of a first graft polymer having an average particle diameter d50 from 400 to 600 nm, consisting of, based on B), b1) from 30 to 90% by weight of a rubber-elastic graft core of, based on b1), b11) from 80 to 99.99% by weight of n-butyl acrylate, b12) from 0.01 to 20% by weight of at least one crosslinking monomer selected from the group consisting of dihydrodicyclopentadienyl acrylate, allyl esters of acrylic acid and ally esters of methacrylic acid, and, b13) from 0 to 40% by weight of one or more further monoethylenically unsaturated monomers, and b2) from 10 to 70% by weight of a graft shell of, based on b2), b21) from 50 to 100% by weight of styrene or &agr;-methylstyrene or mixtures thereof, b22) from 0 to 50% by weight of acrylonitrile, and b23) from 0 to 50% by weight of one or more further monoethylenically unsaturated monomers, C) from 1.5 to 8% by weight of a second graft polymer having a bimodal particle size distribution, the average particle diameter d50 being from 25 to 200 nm on the one hand and from 350 to 550 nm on the other hand, comprising, based on C), c1) from 30 to 90% by weight of a rubber-elastic graft core of, based on c1), c11) from 50 to 100% by weight of butadiene or isoprene or mixtures thereof, and, c12) from 0 to 50% by weight of one or more further monoethylenically unsaturated monomers, and, c2) from 10 to 70% by weight of a graft shell of, based on c2), c21) from 50 to 100% by weight of styrene or &agr;-methylstyrene or mixtures thereof, c22) from 0 to 50% by weight of acrylonitrile and, c23) from 0 to 50% by weight of one or more further monoethylenically unsaturated monomers and D) from 0 to 50% by weight of lubricants or mold release agents, pigments, dyes, flameproofing agents, antioxidants, light stabilizers, fibrous or particulate fillers or reinforcing materials or antistatic agents or other additives, or mixtures thereof, the sum of the graft polymers B) and C) accounting for from 11.5 to 25% by weight of the sum of the three components A), B) and C), and the sum of the four components A) to D) being 100% by weight.