POLYCARBONATE COMPOSITION WITH IMPROVED OPTICAL PROPERTIES
The invention relates to a polycarbonate composition and copolycarbonate composition ((co)polycarbonates) with improved optical properties of the mouldings produced therefrom.
1 .- 8 . (canceled)
9 . A composition comprising
A) one or more aromatic polycarbonate(s) or copolycarbonate(s);
B) from 0.05 to 8 parts by weight, based on the sum of the parts by weight of A and B, of a phosphorus-containing ionic liquid of the formula (I)
where each of R 1 to R 4 is mutually independently a substituted alkyl or aryl moiety; and
C) from 10 ppm to 2000 ppm of at least one additive from the group of phosphorus-based heat stabilizers.
10 . The composition as claimed in claim 9 , wherein a further additive is present, which further additive is a light stabilizer.
11 . The composition as claimed in claim 9 , wherein the polycarbonate is a bisphenol-A-based polycarbonate.
12 . The composition as claimed in claim 9 , wherein the heat stabilizers are selected from the group of tris(2,4-di-tert-butylphenyl)phosphite (Irgafos 168), tetrakis(2,4-di-tert-butylphenyl) [1,1biphenyl]-4,4′-diylbisphosphonite, triisoctyl phosphate (TOF), octadecyl 3-(3,5-di-tert butyl-4-hydroxyphenyl)propionate (Irganox 1076), bis(2,4-dicumylphenyl)pentaerythritol diphosphite (Doverphos S-9228), bis(2,6-di-tertbutyl-4-methylphenyl)pentaerythritol diphosphite (ADK STAB PEP-36) or triphenylphosphine (TPP).
13 . The composition as claimed in claim 9 , wherein the at least one phosphorus-based heat stabilizer comprises a mixture of heat stabilizers from the class of phosphates, phosphites, and sterically hindered phenols.
14 . The composition as claimed in claim 9 , wherein the composition comprises further additives and/or fillers.
15 . A molding comprising a composition as claimed in claim 9 .
16 . A transparent molding comprising a composition as claimed in claim 9 .
17 . The composition as claimed in claim 9 , wherein B is present in the amount from 0.1 to 5 parts by weight based on the sum of the parts by weight of A and B.
18 . The composition as claimed in claim 9 , wherein B is present in the amount 0.15 to 4 parts by weight based on the sum of the parts by weight of A and B.
19 . The composition as claimed in claim 9 , wherein B is present in the amount from 0.2 to 3 parts by weight based on the sum of the parts by weight of A and B.
20 . The composition as claimed in claim 9 , wherein B is present in the amount from 0.25 to 2.5 parts by weight based on the sum of the parts by weight of A and B.
21 . The transparent molding according to claim 16 , contained in an optical component, a protective cover for an optical component, a foil, a sheet, a lens, a housing, an automobile glazing element or an architectural glazing element.