LED lighting elements comprising molded parts made of translucent polycarbonate compositions having a deep gloss effect

Patent metadata

Field	Value
Publication number	US-11598495-B2
Application number	US-201816633056-A
Country	US
Kind code	B2
Filing date	Jul 19, 2018
Priority date	Jul 24, 2017
Publication date	Mar 7, 2023
Grant date	Mar 7, 2023

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.

First claim

The invention claimed is:

1. 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.

2. LED lighting element according to claim 1 , wherein the colourants are selected from the group consisting of colourants based on anthraquinone, and anthrapyridone.

3. LED lighting element according to claim 1 , wherein one colourant is a colourant based on anthraquinone and the other colourant is another colourant based on anthraquinone or a colourant based on anthrapyridone.

4. LED lighting element according to claim 1 , wherein the moulding compound contains from 0.0002% to 0.015% by weight of carbon black.

5. LED lighting element according to claim 1 , wherein the LED is an RGB-LED and/or the LEDs are RGB-LEDs.

6. LED lighting element according to claim 1 , wherein the moulding has been printed on the side on which the LED(s) is/are disposed.

7. LED lighting element according to claim 1 , wherein the moulding has a thickness of 0.5 mm to 4 mm.

8. 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.

Assignees

• Covestro Deutschland Ag

Inventors

• Piermatteo Ciro
• Berger Armin
• Malvestiti Gianmaria
• Taravella Vincenzo

Classifications

• C08K5/0041 Primary

  Optical brightening agents, organic pigments · CPC title

• F21K9/66 Primary

  Details of globes or covers forming part of the light source · CPC title

• C08K3/04

  Carbon · CPC title

• F21Y2115/10

  Light-emitting diodes [LED] · CPC title

• C09B1/32

  substituted by aryl groups (anthrimides C09B1/48) · CPC title