1. Composition containing polycarbonate and from 0.05 wt. % to 0.5 wt. % of a UV absorber and from 0.0001 wt. % to 0.03 wt. % 2-2-hydroxy-4-(2-ethylhexyl)oxyphenyl-4,6-di(4-phenyl)phenyl-1,3,5-triazine, wherein the UV absorber has the formula (4):
wherein R1 and X are the same or different and can be H or alkyl or alkylaryl or
the formula (6):
wherein R12 represents aryl or alkyl.
2. Composition according to claim 1, wherein R1 represents 1-methylpropyl and X represents tert.-butyl.
3. Composition according to claim 1, wherein R1 represents H and X represents octyl.
4. Composition according to claim 1, wherein R1 and X represent 1-methyl-1-phenyl-ethyl.
5. Composition according to claim 1, wherein the UV absorber is 2-(5 chloro-2H-benzotriazol-2-yl)-6-((1,1-dimethylethyl)-4-methyl)-phenol.
6. Composition according to claim 1, wherein the UV absorber is 2,2\u2032-methylenebis6-(2H-benzotriazol-2-yl)-4-(1,1,3,3-tetramethylbutyl)-phenol (CAS No. 103597-45-1).
7. Composition according to claim 1, wherein R12 represents ethyl.
8. Composition according to claim 1, wherein R12 represents 2-ethylhexyl.
9. Composition according to claim 1, wherein the UV absorber is 1,3-bis-(2\u2032-cyano-3\u2032,3\u2032-diphenylacryloyl)oxy-2,2-bis-{(2\u2032-cyano-3\u2032,3\u2032-diphenylacryloyl)oxymethyl}-propane (CAS No. 178671-58-4).
10. Composition according to claim 1, containing from 0.05 wt. % to 0.4 wt. % UV absorber.
11. Composition according to claim 1, containing from 0.0001 wt. % to 0.01 wt. % 2-2-hydroxy-4-(2-ethylhexyl)oxyphenyl-4,6-di(4-phenyl)phenyl-1,3,5-triazine (CAS No. 204583-39-1).
12. Process for the preparation of a composition according to claim 1, wherein polycarbonate and from 0.05 wt. % to 0.5 wt. % of a UV absorber and from 0.0001 wt. % to 0.03 wt. % of the compound 2-2-hydroxy-4-(2-ethylhexyl)oxyphenyl-4,6-di(4-phenyl)phenyl-1,3,5-triazine (CAS No. 204583-39-1) are combined and mixed.
13. Sheet containing the composition according to claim 1.
14. Sheet according to claim 13, wherein the sheet is a solid or multi-wall sheet.
15. Sheet according to claim 13, wherein the sheet is a multi-layer sheet which has a base layer, the base layer containing the composition.
16. Process for the production of a sheet according to claim 13, comprising the steps of extruding or coextruding said composition.
17. Composition according to claim 1, characterised in that the UV absorber and 2-2-hydroxy-4-(2-ethylhexyl)oxyphenyl-4,6-di(4-phenyl)phenyl-1,3,5-triazine (CAS No. 204583-39-1) are present in a weight ratio of from 5000:1 to 30:1.
18. Composition according to claim 1, wherein the UV absorber has the formula (4):
wherein R1 and X are the same or different and can be H or alkyl or alkylaryl.
The claims below are in addition to those above.
All refrences to claim(s) which appear below refer to the numbering after this setence.
1. A device (10) for measuring the rotating angle of two objects (11, 12) comprising the two objects (11, 12) which rotate relative to each other around a rotating axis (D), with precisely one transmitter (20), which is assigned to one of the objects (11) and which emits light that is either polarized or becomes polarized by means of a polarization filter, and with a polarizer (30), such that the transmitter (20) and the polarizer (30) rotate relative to each other as a function of the rotating angle, and such that the polarizer (30) has a polarizing area (31) and a non-polarizing area (32), where the non-polarizing area (32) is positioned eccentric to the rotating axis (D), and such that the device (10) has at least a first receptor (41) and a second receptor (42) which measure at least a portion of the luminosity passing through the polarizer (30) or reflected by the polarizer (30), in order to produce signals that are dependent on the rotating angle, and where the first receptor (41) has a first reception area (41a), and the second receptor (42) has a second reception area (42a) which is distinct from the first reception area (42a),
wherein the receptors are positioned so as to produce a sine wave signal with maxima of different amplitudes but no phase shift.
2. The device according to claim 1, wherein the non-polarizing area (32) is designed as a circular segment or a circular sector.
3. The device according to claim 1, wherein the non-polarizing area (32) is designed as an absorptive area.
4. The device according to claim 1, wherein the non-polarizing area (32) is designed as a reflective area which is positioned at angle of 180\xb0 relative to the surface of the polarizing area (31).
5. The device according to claim 1, wherein the polarizer (30) is designed as a reflective polarizer.
6. The device according to claim 1, wherein there is positioned between the polarizer (30) and the receptors (41, 42, 43, 44, 45, 46, 47, 48) a diaphragm (50), which has a hole 51, 52, 53, 54, 55, 56, 57, 58 for each receptor (41, 42, 43, 44, 45, 46, 47, 48) and, in particular, has a central hole (49) for the transmitter (20).
7. The device according to claim 1, wherein the first and second receptor (41, 42) are symmetrically positioned at an angular distance of 180\xb0 from the transmitter (20), and a third and fourth receptor (43, 44), are provided, such that the four receptors (41, 42, 43, 44) are positioned at an angular distance of 90\xb0 one from the other.
8. The device according to claim 1, wherein the polarizing area (31) of the polarizer (30) has at least two different polarizing directions.
9. The device according to claim 7, wherein a total of eight receptors (41, 42, 43, 44, 45, 46, 47, 48) are provided which are positioned an equal angular distance one from the other.