Stabilizer Composition for Polyamide Anti-Yellowing in LED Applications

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Solution Overview

Problem

Polyamide compositions used in LED applications tend to yellow when exposed to long-term heat, leading to a significant drop in reflectivity, especially at high temperatures or extended aging times, which existing formulations fail to adequately address.

Innovation Solution

Incorporating a stabilizer composition comprising an organic copper complex and an organic phosphinate salt into the polyamide, with a preferred mixture of potassium iodide and triphenyl phosphine, to enhance anti-yellowing performance and maintain reflectivity.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Ease of manufacture

If polyamide composition is used for LED components, then processibility and mechanical properties are improved, but anti-yellowing performance deteriorates when exposed to long-term heat

Engineering Contradiction:

ImproveprocessibilityVSAvoidanti-yellowing performance

Core Design Contradiction:

Ease of manufactureVSReliability

Solution Approach 1:

The patent uses a composite stabilizer system combining multiple components: copper complex (0.1-5 wt%), phosphorus compound (0.1-5 wt%), and nitrogen-containing compound (0.1-5 wt%). This multi-component composite approach provides synergistic protection against yellowing while maintaining the processibility of semi-aromatic polyamide for LED component manufacturing.

Inventive Principle:

Principle #40Composite materials

2Reliability

If existing stabilizer formulations are used, then some anti-yellowing improvement is achieved, but reflectivity retention is insufficient at high temperatures (190°C or higher) and long aging times (500h or longer)

Engineering Contradiction:

Improveanti-yellowing performanceVSAvoidreflectivity retention at high temperature

Core Design Contradiction:

ReliabilityVSTemperature

Solution Approach 1:

The patent optimizes the concentration parameters of stabilizer components to achieve better high-temperature performance. Specifically, it uses copper complex (0.1-5 wt%), phosphorus compound (0.1-5 wt%), and nitrogen-containing compound (0.1-5 wt%), with preferred ranges of 0.5-2 wt% for each. This parameter optimization enables the composition to maintain reflectivity even after 500+ hours at 190°C.

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The patent introduces a multi-component stabilizer system that acts as an intermediary protection layer. The copper complex, phosphorus compound, and nitrogen-containing compound work together to intercept and neutralize degrading factors (oxygen, radicals, heat) before they can cause yellowing and reflectivity loss in the polyamide matrix at high temperatures.

Inventive Principle:

Principle #24Intermediary (Mediator)

3Reliability

If stabilizer composition is added to improve anti-yellowing, then reflectivity retention is enhanced, but formulation complexity increases

Engineering Contradiction:

Improvereflectivity retentionVSAvoidformulation complexity

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The patent merges multiple stabilizer functions into a single integrated formulation system. By combining copper complex, phosphorus compound, and nitrogen-containing compound in specific proportions (each 0.1-5 wt%), it achieves comprehensive protection against yellowing and reflectivity loss while managing formulation complexity through defined concentration ranges and synergistic interactions among components.

Inventive Principle:

Principle #5Merging (Combining)

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 stabilizer composition significantly improves anti-yellowing and reflectivity retention even after long-term thermal aging, outperforming previous formulations by maintaining high reflectivity at both high temperatures and extended aging periods.

Implementation Method 1

a stabilizer composition which comprises an organic phosphinate salt and a mixture comprising an organic copper complex

Methodology Applied

Scientific EffectThermal stabilization:

Implementation Method 2

by incorporating a stabilizer composition comprising an organic copper complex and an organic phosphinate salt into a plastic used in areas where anti-yellowing is needed

Methodology Applied

Scientific EffectAnti-yellowing:

Data Source

PatentEP3728436B1A stabilizer composition, its use and a plastic composition comprising the same

Publication Date: 2024.05.29 BASF SE

AI summary

The present invention relates to a stabilizer composition, and its use for improving the anti-yellowing of a plastic used in areas where anti-yellowing is needed, such as polyamide, especially semi-aromatic polyamide. Moreover, the present invention relates to a plastic composition comprising the stabilizer composition. The plastic composition of the present invention could be used in, for example, out-door housing for consumer parts, automotive exterior parts, or a highly reflective application, more particularly in the manufacturing of light-emitting diode (LED) components.