LED lighting elements comprising molded parts made of translucent polycarbonate compositions having a deep gloss effect
AssigneeCovestro Deutschland AG
InventorsCiro Piermatteo, Armin Berger, Gianmaria Malvestiti, Vincenzo Taravella
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Abstract
The present invention relates to LED lighting elements comprising translucent mouldings composed of polycarbonate-based moulding compounds, comprising a colourant mixture, carbon black, scattering additive and optionally white pigment, as used, for example, as covers with a day/night design. Through combination with one or more RGB-LEDs, it is possible to achieve surprising colour effects in night design with presence of a deep gloss effect in mouldings that are black and grey in day design.
Claims8
A LED lighting element comprising a moulding and one or more LEDs arranged in the LED lighting element such that they shine through the moulding, wherein the moulding has been produced from a translucent moulding compound consisting of
- a) 95% by weight to 99.95% by weight of aromatic polycarbonate,
- b) 0.0005% by weight of 0.02% by weight of a colourant mixture composed of colourants other than component c and component e, comprising at least two colourants selected from the group consisting of colourants based on anthraquinone, anthrapyridone, perinone, methine and quinoline,
- c) 0.00001% by weight to 0.02% by weight of carbon black, wherein the carbon black has a particle size of 10 to 30 nm;
- d) 0.05% to 0.6% by weight of at least one scattering additive selected from the group consisting of PMMA containing acrylate based scattering additives and silsesquioxane;
- e) 0.03% to 0.1% by weight of at least one white pigment, wherein the white pigment is titanium dioxide;
- f) optionally one or more further additives other than component b to component e., selected from the group consisting of demoulding agents, antioxidants, flame retardants, UV absorbers, IR absorbers, anti-dripping agents, optical brighteners, thermal stabilizers.
A LED lighting element comprising a moulding and one or more LEDs arranged in the LED lighting element such that they shine through the moulding, wherein the moulding has been produced from a translucent moulding compound consisting of
- a) 95% by weight to 99.95% by weight of aromatic polycarbonate;
- b) 0.0005% by weight of 0.02% by weight of a colourant mixture composed of colourants other than component c and component e, comprising at least two colourants selected from the group consisting of colourants based on anthraquinone, anthrapyridone, perinone, methine and quinoline;
- c) 0.00001%0.002% by weight to 0.02% by weight of carbon black, wherein the carbon black has a particle size of 10 to 30 nm;
- d) 0.05% to 0.6% by weight of at least one scattering additive from the group consisting of PMMA containing acrylate-based scattering additives and silsesquioxane;
- f) optionally one or more further additives other than component b to e, selected from the group consisting of demoulding agents, antioxidants, flame retardants, UV absorbers, IR absorbers, anti-dripping agents, optical brighteners and/or thermal stabilizers, and wherein the moulding compound is free of white pigment.
Dependencies are inferred from the claim text.