Patent ID: 8163822

Claim:
A process for producing a composition comprising a melt polycarbonate, at least one phosphine of formula (I), and at least one aliphatic carboxylic ester: wherein Ar 1 and Ar 2 are, identically or differently optionally substituted aryl moieties, and R′ is an optionally substituted aryl moiety or one of the following moieties (Ia) to (Ih) wherein R is an optionally substituted C 6 -C 14 -aryl moiety, n and m are respectively and independently of one another an integer from 1 to 7 and wherein the H atoms of moieties (Ia) to (Ic) are optionally replaced by substituents, and with the proviso that R′ can also be optionally substituted 4-phenyl-phenyl or optionally substituted α-naphthyl if both of the Ar moieties in formula (I) are also respectively optionally substituted 4-phenyl-phenyl or optionally substituted a α-naphthyl; said process comprising introducing said at least one phosphine of formula (I) and said at least one carboxylic ester into the melt stream of said melt polycarbonate via an ancillary extruder downstream from a final polycondensation stage and optionally mixing said at least one phosphine of formula (I), said at least one carboxylic ester, and said melt polycarbonate in a static mixer.