Patent ID: 6417256
Filing Date: 2002-07-09
Classification: C08K,C08L

Abstract:
A thermoplastic moulding composition containing:A 1 to 99 parts by weight of an aromatic polycarbonate or polyester carbonate; B 1 to 99 parts by weight of at least one graft polymer prepared by solution polymerisation and having a rubber content of from 20 to 50 wt. %, based on the graft polymer, and an average particle diameter of the rubber phase of from 80 to 600 nm, wherein said graft polymer B is prepared by radically polymerising a monomer mixture comprising, B.1 90 to 20 parts by weight aromatic monoalkenyl compounds, B.2 0 to 50 parts by weight ethylenically unsaturated nitrites, B.3 0 to 30 parts by weight of other copolymerisable compounds, in the presence of 15 to 50 parts by weight, per 100 parts by weight of monomers B.1 to B.3, of a soluble, gel-free butadiene polymer or butadiene-styrene copolymer, â€ƒand in the presence of 50 to 200 parts by weight of a solvent per 100 parts by weight of monomers B.1 to B.3, until the polymer content of the total mixture is 30 to 70 wt. %, with thorough mixing and optionally subsequent addition of controller and initiator, wherein the solvent is a mixture of (i) a solvent S1 selected from aliphatic (C1-C8) alcohol, cycloaliphatic (C5-C6) alcohol, ketone, ether, ester, nitrile and mixtures thereof, and (ii) a solvent S2 selected from aliphatic hydrocarbons, cycloaliphatic hydrocarbons aromatic hydrocarbons and mixtures thereof; â€ƒand C at least one organic phosphorus compound represented by formula (III) â€ƒwherein R5, R6, R7, R8, independently of one another, each denote optionally halogenated C1-C8-alkyl, C5-C6-cycloalkyl, C6-C10-aryl or C7-C12-aralkyl, X denotes a mononuclear or polynuclear aromatic group having 6 to 30 C atoms, n represents 0 or 1, and N represents values from 0.3 to 20.