UV-Protective Coating Composition with Non-Crystallizing UV Absorber

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Solution Overview

Problem

Current UV protective coatings for optoelectronic devices face challenges due to the photodegradation of UV absorbers, leading to decreased UV blocking capability and substrate exposure, with existing solutions either compromising on stability, absorptivity, or increasing costs and thickness.

Innovation Solution

A UV-protective coating composition combining an acrylate polymer with a non-crystallizing UV-absorber composition that includes a dibenzoylresorcinol and a triazine compound, where the dibenzoylresorcinol is present at 10-25 weight percent, preventing crystallization and maintaining high absorptivity while ensuring photostability.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If UV absorber loading is increased to maintain UV blocking capability, then UV protection is improved, but coating thickness and cost increase

Engineering Contradiction:

ImproveUV blocking capabilityVSAvoidUV absorber loading

Core Design Contradiction:

ReliabilityVSQuantity of substance

Solution Approach 1:

The patent combines multiple UV absorbers (organic UV absorber and inorganic UV absorber) in a composite coating system. This allows achieving high UV blocking capability through synergistic effects of different absorber types, maintaining protection while using optimized, not excessive, amounts of UV absorbers

Inventive Principle:

Principle #40Composite materials

Solution Approach 2:

The patent optimizes the concentration ratios and types of UV absorbers used in the coating. By carefully selecting and adjusting the parameters of UV absorber composition and distribution, the coating achieves effective UV protection with minimized absorber loading

Inventive Principle:

Principle #35Parameter changes

2Reliability

If UV absorber loading is increased to compensate for degradation, then UV protection is improved, but coating physical properties deteriorate

Engineering Contradiction:

ImproveUV protection durationVSAvoidcoating physical properties

Core Design Contradiction:

ReliabilityVSStrength

Solution Approach 1:

The composite coating system integrates UV absorbers with compatible polymer matrices and stabilizers, creating a synergistic composition that maintains both UV protection and coating physical properties. The inorganic UV absorber provides long-term stability without compromising the coating's mechanical and optical properties

Inventive Principle:

Principle #40Composite materials

Solution Approach 2:

The patent incorporates stabilizers and compatible polymer matrices beforehand to prevent UV absorber degradation and maintain coating integrity over time, cushioning against the potential harmful effects of UV exposure and coating deterioration

Inventive Principle:

Principle #11Beforehand cushioning (Prior cushioning)

3Reliability

If triazine UV absorbers are used to achieve high photostability, then UV stability is improved, but compatibility with coating matrices deteriorates

Engineering Contradiction:

ImprovephotostabilityVSAvoidcompatibility with coating matrices

Core Design Contradiction:

ReliabilityVSAdaptability or versatility

Solution Approach 1:

The patent merges triazine UV absorbers with other UV absorbers and compatible polymer matrices in a composite coating system. This combination approach allows the triazine component to provide photostability while the overall formulation maintains compatibility through the synergistic interaction of multiple components

Inventive Principle:

Principle #5Merging (Combining)

Solution Approach 2:

The patent uses compatible polymer matrices and stabilizers as intermediary substances that facilitate the integration of triazine UV absorbers into the coating system, enabling photostability to be achieved without compromising matrix compatibility

Inventive Principle:

Principle #24Intermediary (Mediator)

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 solution provides effective UV protection with high photostability and absorptivity, minimizing coating thickness and UV absorber loading, while maintaining substrate transparency and ease of application, without excessive cost or interference with substrate properties.

Implementation Method 1

a non-crystallizing UV-absorber composition that includes a dibenzoylresorcinol and a triazine compound

Methodology Applied

Scientific EffectUV absorption: Absorption (EM radiation)

Implementation Method 2

the dibenzoylresorcinol is present at a level sufficient to prevent the substantial crystallization of the triazine compound, under temperature and humidity conditions of evaporation for solvents or solvent mixtures in the coating composition

Methodology Applied

Scientific EffectCrystallization prevention: Crystallisation

Data Source

PatentEP2302006B1Protective coating compositions and devices

Publication Date: 2012.11.28 GENERAL ELECTRIC CO

AI summary

In one aspect of the present invention, a UV-protective coating composition is described. The UV protective coating composition includes an acrylate polymer; and a non-crystallizing UV-absorber composition. The non-crystallizing UV absorber composition includes a dibenzoylresorcinol and at least one triazine compound. The dibenzoylresorcinol is present at a level in the range of from about 10 weight percent to about 25 weight percent, based on the total weight of the coating composition. Also provided is an article that includes the UV protective coating composition, and a method to protect the article.