Polycarbonate composition

A polycarbonate composition, comprising

• A) 8-70 wt. % of a polycarbonate component,
• B) 25-90 wt. % of a polysiloxane-polycarbonate copolymer component,
• C) a flame retardant component, which comprises 0.5-6 wt. % of a cyclic phosphazene of formula (X)
• wherein,
• k represents 1 or an integer from 1 to 10, preferably an integer from 1 to 8, particularly preferably from 1 to 5,
• having a trimer content (k=1) of from 60 to 98 mol %, based on component C,
• and wherein,
• R is in each case identical or different and represents an amine group;
• C1- to C8-alkyl, preferably methyl, ethyl, propyl or butyl, each optionally halogenated, preferably halogenated with fluorine;
• C1- to C8-alkoxy, preferably methoxy, ethoxy, propoxy or butoxy;
• C5- to C6-cycloalkyl, each optionally substituted by alkyl, preferably C1-C4-alkyl, and/or by halogen, preferably chlorine and/or bromine;
• C6- to C20-aryloxy, preferably phenoxy, naphthoxy, each optionally substituted by alkyl, preferably C1-C4-alkyl, and/or by halogen, preferably chlorine, bromine, and/or by hydroxy;
• C7- to C12-aralkyl, preferably phenyl-C1-C4-alkyl, each optionally substituted by alkyl, preferably C1-C4-alkyl, and/or by halogen, preferably chlorine and/or bromine;
• or a halogen group, preferably chlorine;
• or an OH group, and
• D) an impact modifier component, which comprises 0.5-6 wt. % of methyl methacrylate-butadiene-styrene,
• with the above weight percentages based on said polycarbonate composition as 100 wt. %.

A process for the preparation of a polycarbonate composition, comprising the following steps:

• mixing the components for the preparation of said polycarbonate composition, said components including:
• A) 8-70 wt. % of a polycarbonate component,
• B) 25-90 wt. % of a polysiloxane-polycarbonate copolymer
• C) a flame retardant component, which comprises 0.5-6 wt. % of a cyclic phosphazene of formula (X)
• wherein,
• k represents 1 or an integer from 1 to 10, preferably an integer from 1 to 8, particularly preferably from 1 to 5,
• having a trimer content (k=1) of from 60 to 98 mol %, based on component C, and wherein
• R is in each case identical or different and represents an amine group;
• C1- to C8-alkyl, preferably methyl, ethyl, propyl or butyl, each optionally halogenated, preferably halogenated with fluorine;
• C1- to C8-alkoxy, preferably methoxy, ethoxy, propoxy or butoxy;
• C5- to C6-cycloalkyl, each optionally substituted by alkyl, preferably C1-C4-alkyl, and/or by halogen, preferably chlorine and/or bromine;
• C6- to C20-aryloxy, preferably phenoxy, naphthoxy, each optionally substituted by alkyl, preferably C1-C4-alkyl, and/or by halogen, preferably chlorine, bromine, and/or by hydroxy;
• C7- to C12-aralkyl, preferably phenyl-C1-C4-alkyl, each optionally substituted by alkyl, preferably C1-C4-alkyl, and/or by halogen, preferably chlorine and/or bromine;
• or a halogen group, preferably chlorine;
• or an OH group, and
• D) an impact modifier component, which comprises 0.5-6 wt. % of methyl methacrylate-butadiene-styrene,
• with the above weight percentages based on said polycarbonate composition as 100 wt. %.