Polycarbonate compositions containing polyethercarbonate polyols

1 . A transparent thermoplastic composition containing

A) aromatic polycarbonate, and

B) polyether carbonate polyol,

C) optionally at least one heat stabilizer and/or transesterification stabilizer,

D) optionally at least one UV absorber, and

E) optionally one or more further additives distinct from components B, C and D,

wherein “transparent” means a visual transmittance Ty (D65 observed at) 10° of at least 84%, determined according to ISO 13468-2:2006 at a thickness of 4 mm, and a haze of <5%, determined according to ASTM D1003:2013 at a layer thickness of 4 mm.

2 . The thermoplastic composition as claimed in claim 1 containing:

A) 70.0% by weight to 99.95% by weight of the aromatic polycarbonate, and

B) 0.05% to 2.0% by weight of the polyether carbonate polyol.

3 . The transparent thermoplastic composition as claimed in claim 1 , wherein the composition contains:

A) 80.0% to 99.9% by weight of the aromatic polycarbonate and

B) 0.1% to 1.2% by weight of the polyether carbonate polyol,

C) 0% to 1.0% by weight of the at least one heat stabilizer and/or transesterification stabilizer,

D) 0% to 1.0% by weight of the at least one UV absorber, and

E) optionally the one or more further additives distinct from components B, C and D.

4 . The transparent thermoplastic composition as claimed in claim 1 , wherein the composition contains at least 0.2% by weight of the polyether carbonate polyol.

5 . The transparent thermoplastic composition as claimed in claim 1 containing the at least one UV absorber as component D.

6 . The transparent thermoplastic composition as claimed in claim 1 , consisting of the components A, B, optionally C, optionally D, optionally E and optionally blend partners.

7 . The transparent thermoplastic composition as claimed in claim 1 , consisting of:

A) 95.0% to 99.9% by weight of the aromatic polycarbonate, and

B) 0.1% to 1.2% by weight of the polyether carbonate polyol,

C) 0% to 1.0% by weight of the at least one heat stabilizer and/or transesterification stabilizer,

D) 0% to 1.0% by weight of the at least one UV absorber, and

E) optionally the one or more further additives, wherein the further additives are selected from the group consisting of antioxidants, demolding agents, flame retardants, IR absorbers, antistats, optical brighteners, colorants, and/or additives for laser marking.

8 . The transparent thermoplastic composition as claimed in claim 1 , wherein the polyether carbonate polyol present has a hydroxyl number according to DIN 53240-1:2013-06 of ≥20 mg KOH/g to ≤120 mg KOH/g.

9 . The transparent thermoplastic composition as claimed in claim 1 , wherein the polyether carbonate polyol present is exclusively one having a hydroxyl number according to DIN 53240-1:2013-06 of ≥20 mg KOH/g to ≤120 mg KOH/g and/or a CO 2 content of 10% to 25% by weight.

10 . The transparent thermoplastic composition as claimed in claim 1 , wherein the polyether carbonate polyol has a hydroxyl number of ≥20 mg KOH/g to ≤250 mg KOH/g determined according to DIN 532401:2013-06 and is obtainable by copolymerization of ≥2.0% to ≤30.0% by weight of carbon dioxide and ≥70% to ≤98% by weight of propylene oxide in the presence of a hydroxy-functional starter molecule.

11 . The transparent thermoplastic composition as claimed in claim 1 , wherein the polyether carbonate polyol contains blocks according to formula (IV), wherein R is an organic radical, wherein e and f are each an integer, and wherein a ratio e/f is from 2:1 to 1:20,

12 . A molding produced from a transparent thermoplastic composition as claimed in claim 1 .

13 . The molding as claimed in claim 12 , wherein the molding is part of a headlight cover or a headlight cover, part of a display, part of a lighting unit, or a lens.

14 . A method to improve the transmittance in the VIS range of a transparent thermoplastic composition comprising forming the transparent thermoplastic composition as claimed in claim 1 .

15 . The method as claimed in claim 14 , wherein the polyether carbonate polyol has a hydroxyl number according to DIN 53240-1:2013-06 of ≥20 mg KOH/g to ≤120 mg KOH/g and/or a CO 2 content of 10% to 25% by weight.

16 . The transparent thermoplastic composition as claimed in 7 , wherein the colorants comprise an organic dye.

17 . The transparent thermoplastic composition of claim 1 , wherein the polyether carbonate polyol of component B) has a molecular weight Mn of 400 to 10 000 g/mol.

18 . The transparent thermoplastic composition of claim 1 , wherein the polyether carbonate polyol of component B) has a molecular weight Mn of 500 to 6000 g/mol.

19 . The transparent thermoplastic composition of claim 11 , wherein the organic radical is alkyl, alkylaryl or aryl.