Color-Stable LED Substrates via Composite Colorant Mixture
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Solution Overview
Problem
Existing transparent or translucent thermoplastic compositions used in optical components like lenses and light guides undergo unacceptable color changes when exposed to LED light, particularly due to the influence of LED radiation, which affects their optical properties and stability.
Innovation Solution
A polymer composition incorporating a specific mixture of colorants, including perinone-based, indanthrone-based, phthalocyanine, and phthalocyanine complex colorants, along with stabilizers and UV absorbers, is used to create colored molded articles with high color stability under LED light exposure, maintaining optical properties and mechanical integrity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If conventional colorants are used in transparent or translucent thermoplastic compositions, then the material can be produced with good processability and initial optical properties, but the color stability deteriorates when exposed to LED light
Solution Approach 1:
The patent uses a composite colorant system combining multiple colorants (solvent violet 36, solvent blue 97, and at least one from perinone, indanthrone, or phthalocyanine groups) rather than a single colorant. This composite approach creates synergistic effects where the colorants protect each other from LED light degradation, resolving the contradiction between initial processability and long-term color stability under LED exposure
Solution Approach 2:
The patent specifies precise concentration ranges for each colorant component (violet component: 0.01-1000 ppm, blue component: 0.01-1000 ppm, and additional colorants: 0.01-100 ppm) to optimize the balance between LED light resistance and color stability. By controlling these compositional parameters, the material maintains both processability and enhanced resistance to LED light-induced color changes
2Stability of the object's composition
If LED light resistance is improved through colorant selection, then color stability increases, but the complexity of the composition increases
Solution Approach 1:
The patent establishes specific concentration ranges for each colorant component to simplify the composition design process. By defining clear parameter boundaries (violet: 0.01-1000 ppm, blue: 0.01-1000 ppm, additional colorants: 0.01-100 ppm), the complex multi-colorant system becomes manageable and reproducible, resolving the contradiction between achieving color stability and maintaining composition simplicity
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The composition ensures minimal color change and high stability of the colorants under LED light, maintaining optical properties and mechanical integrity, with improved heat resistance and refractive index, suitable for use in LED-exposed applications.
Implementation Method 1
The invention relates to the use of a colorant mixture containing at least one colorant of structure 1a) and/or 1b) and at least one further colorant selected from the group comprising the perinone-based colorants and colorants based on a different structure 1a) or 1b) for producing colored molded articles with high color stability to the action of LED light
Data Source
AI summary
The invention relates to a transparent or translucent thermoplastic moulding compound comprising a colorant mixture comprising at least one colorant of the structure 1a) and/or 1b) and at least one further colorant selected from the group comprising the perinone-based colorants other than structure 1a) or 1b) and colorants based on a phthalocyanine, phthalocyanine complex or indanthrene. The invention relates in particular to transparent or translucent thermoplastic moulding compounds comprising such a colorant mixture for the production of optical components, for example lenses or optical fibres, which have elevated colour stability on illumination with LED light, and to the production and use thereof.