Multilayer composite material containing special polycarbonate compositions as a matrix material

A process for producing a layer of fibre composite material, wherein a molten, aromatic polycarbonate-based composition comprising

• A) aromatic polycarbonate,
• B) 1% by weight to 14% by weight of talc,
• C) 7% by weight to 15% by weight of at least one cyclic phosphazene of formula (1)
• where
• R is the same or different and is an amine radical, an in each case optionally halogenated C1- to C8-alkyl radical, C1- to C8-alkoxy radical, in each case optionally alkyl- and/or halogen-substituted C5- to C6-cycloalkyl radical, in each case optionally alkyl- and/or halogen- and/or hydroxyl-substituted C6- to C20-aryloxy radical, in each case optionally alkyl- and/or halogen-substituted C7- to C12-aralkyl radical or a halogen radical or an OH radical,
• k is an integer from 1 to 10,
• D) 0% to 11% by weight of at least one phosphorus compound of the general formula (V)
• where
• R1, R2, R3 and R4 are each independently a C1- to C8-alkyl radical, in each case optionally halogenated and in each case branched or unbranched, and/or C5- to C6-cycloalkyl radical, C6- to C20-aryl radical or C7- to C12-aralkyl radical, in each case optionally substituted by branched or unbranched alkyl and/or halogen,
• n is independently 0 or 1,
• q is an integer from 0 to 30,
• X is a mono- or polycyclic aromatic radical having 6 to 30 carbon atoms or a linear or branched aliphatic radical having 2 to 30 carbon atoms, each of which may be substituted or unsubstituted, and bridged or unbridged;
• E) 0% to 0.2% by weight of at least one stabilizer selected from the group consisting of alkyl phosphate, ethylenediaminetetraacetic acid and citric acid,
• F) optionally further additives,
• wherein the composition is free of PTFE,
• is applied to a raw fibre tape composed of fibre material that has been preheated to above the glass transition temperature of the polycarbonate.

A process for producing a multilayer composite material, comprising the following steps:

• providing at least one inner layer of fibre composite material and two outer layers of fibre composite material, wherein the individual layers of fibre composite material are produced by applying a molten, aromatic polycarbonate-based composition comprising
• A) aromatic polycarbonate,
• B) 1% by weight to 14% by weight of talc,
• C) 7% by weight to 15% by weight of at least one cyclic phosphazene of formula (1)
• where
• R is the same or different and is an amine radical, an in each case optionally halogenated C1- to C8-alkyl radical, C1- to C8-alkoxy radical, in each case optionally alkyl- and/or halogen-substituted C5- to C6-cycloalkyl radical, in each case optionally alkyl- and/or halogen- and/or hydroxyl-substituted C6- to C20- aryloxy radical, in each case optionally alkyl- and/or halogen-substituted C7- to C12-aralkyl radical or a halogen radical or an OH radical, k is an integer from 1 to 10,
• D) 0% to 11% by weight of at least one phosphorus compound of the general formula (V)
• where
• R1, R2, R3 and R4 are each independently a C1- to C8-alkyl radical, in each case optionally halogenated and in each case branched or unbranched, and/or C5- to C6-cycloalkyl radical, C6- to C20-aryl radical or C7- to C12-aralkyl radical, in each case optionally substituted by branched or unbranched alkyl and/or halogen,
• n is independently 0 or 1,
• q is an integer from 0 to 30,
• X is a mono- or polycyclic aromatic radical having 6 to 30 carbon atoms or a linear or branched aliphatic radical having 2 to 30 carbon atoms, each of which may be substituted or unsubstituted, and bridged or ;
• E) 0% to 0.2% by weight of at least one stabilizer selected from the group consisting of alkyl phosphate, ethylenediaminetetraacetic acid and/or citric acid,
• F) optionally further additives,
• wherein the composition is free of PTFE,
• to a raw fibre tape composed of fibre material that has been preheated to above the glass transition temperature of the polycarbonate,
• layering the layers of fibre composite material in the desired orientation relative to one another, based on the orientation of the fibre material,
• bonding the layered layers of fibre composite material to form the multilayer composite material.