Compositions comprising A) 40 to 99 parts by wt. (in each case based on the sum of the parts by weight of components A+B+C+D) of aromatic polycarbonate and/or aromatic polyester carbonate, B) 0.5 to 20 parts by wt. (in each case based on the sum of the parts by weight of components A+B+C+D) of graft polymer, characterized in that the graft base is a silicone/acrylate composite rubber of mutually penetrating silicone rubber and polyalkyl (meth)acrylate rubber, wherein the content of silicone rubber is 65 - 95 wt.% (based on the graft base), C) 2 - 8 parts by wt. (in each case based on the sum of the parts by weight of components A+B+C+D) of graft polymer, characterized in that component C a graft polymer of C.1 5 to 95 wt.% of at least one vinyl monomer on C.2 95 to 5 wt.% of at least one graft base is chosen from at least one rubber of the group consisting of butadiene rubber and isoprene rubber, D) 0.4 to 20 parts by wt. (in each case based on the sum of the parts by weight of components A+B+C+D) of flameproofing agent chosen from the group consisting of mono- and oligomeric phosphoric acid esters of the formula (VIII) wherein R 1, R 2, R 3 and R 4 represent cresyl, phenyl, xylenyl, propylphenyl or butylphenyl, n is 1, q represents values from 0.5 to 6 and X is derived from resorcinol, hydroquinone, bisphenol A or diphenylphenol. E) 0 to 50 parts by wt. (in each case based on the sum of the parts by weight of components A+B+C+D) of one or more additives chosen from the group consisting of flameproofing synergists, antidripping agents, lubricants and mould release agents, nucleating agents, stabilizers, antistatics, acids, fillers and reinforcing substances and dyestuffs and pigments. wherein the composition is free of rubber-free vinyl (co)polymer and polyalkylene terephthalate, A) 40 to 99 parts by wt. (in each case based on the sum of the parts by weight of components A+B+C+D) of aromatic polycarbonate and/or aromatic polyester carbonate, B) 0.5 to 20 parts by wt. (in each case based on the sum of the parts by weight of components A+B+C+D) of graft polymer, characterized in that the graft base is a silicone/acrylate composite rubber of mutually penetrating silicone rubber and polyalkyl (meth)acrylate rubber, wherein the content of silicone rubber is 65 - 95 wt.% (based on the graft base), C) 2 - 8 parts by wt. (in each case based on the sum of the parts by weight of components A+B+C+D) of graft polymer, characterized in that component C a graft polymer of C.1 5 to 95 wt.% of at least one vinyl monomer on C.2 95 to 5 wt.% of at least one graft base is chosen from at least one rubber of the group consisting of butadiene rubber and isoprene rubber, C.1 5 to 95 wt.% of at least one vinyl monomer on C.2 95 to 5 wt.% of at least one graft base is chosen from at least one rubber of the group consisting of butadiene rubber and isoprene rubber, D) 0.4 to 20 parts by wt. (in each case based on the sum of the parts by weight of components A+B+C+D) of flameproofing agent chosen from the group consisting of mono- and oligomeric phosphoric acid esters of the formula (VIII) wherein R 1, R 2, R 3 and R 4 represent cresyl, phenyl, xylenyl, propylphenyl or butylphenyl, n is 1, q represents values from 0.5 to 6 and X is derived from resorcinol, hydroquinone, bisphenol A or diphenylphenol. R 1, R 2, R 3 and R 4 represent cresyl, phenyl, xylenyl, propylphenyl or butylphenyl, n is 1, q represents values from 0.5 to 6 and X is derived from resorcinol, hydroquinone, bisphenol A or diphenylphenol. E) 0 to 50 parts by wt. (in each case based on the sum of the parts by weight of components A+B+C+D) of one or more additives chosen from the group consisting of flameproofing synergists, antidripping agents, lubricants and mould release agents, nucleating agents, stabilizers, antistatics, acids, fillers and reinforcing substances and dyestuffs and pigments. wherein the composition is free of rubber-free vinyl (co)polymer and polyalkylene terephthalate,