Organic colouring agents and coloured polymer compositions with a high stability to weathering
AssigneeBayer MaterialScience AG
InventorsAlexander Meyer, Michael Wagner, Jörg Reichenauer
Life of this patent
Estimating the term…
Abstract
The present invention relates to organic coloring agents with a high color stability to weathering for thermoplastics. The invention furthermore relates to a polymer composition containing at least one thermoplastic and at least one organic coloring agent, preferably a combination of at least two organic coloring agents, of a specific structure. The invention moreover relates to the use of the coloring agents according to the invention for coloring polymer compositions, in particular for transparent formulations such as are required for the production of panes for use in buildings, motor vehicles and track vehicles or aircraft.
Claims8
A transparent polycarbonate composition comprising a colouring agent combination of the structures selected from the group consisting of:
- XIV. (3), (4), (7)
- XV. (3), (5), (7)
- XXI. (7), (4) and
- XXII. (7), (5) and mixture thereof,
- wherein the structures are as follows:
- wherein
- R is selected from the group consisting of H and the p-methylphenylamine radical;
- wherein
- R3 is a halogen;
- n=4;
- wherein
- R1 and R2, independently of one another, represent a linear or branched alkyl radical, or halogen;
- n represents a natural number between 0 and 4, wherein the colouring agent composition is used in amounts, based on the particular individual components, of from 0.000001 wt. % to 1 wt. %, based on the total polymer composition, and wherein the change in the colour value E after 3,000 h of artificial weathering with exposure to xenon light at 0.75 W is less than 3.0.
Dependencies are inferred from the claim text.