UV-Curable Coating Composition for Heat- and Humidity-Resistant Resin Surfaces

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Solution Overview

Problem

Existing resin materials, particularly polycarbonate, lack sufficient resistance to ultra-high temperature and high humidity, leading to issues such as surface breakage, erosion, and reduced durability in severe environments.

Innovation Solution

An active-energy-ray-curable coating composition comprising specific ratios of poly(meth)acrylate compounds of pentaerythritol and/or polyurethane (meth)acrylate compounds of polypentaerythritol, poly(meth)acrylates with isocyanuric rings, urethane di(meth)acrylate compounds from alicyclic isocyanates, and urethane tri(meth)acrylate compounds with isocyanurate or allophanate bonds, enhancing abrasion resistance, heat resistance, and humidity resistance.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If conventional coating compositions are used, then abrasion resistance and weather resistance are improved, but resistance to ultra-high temperature and high humidity cannot be achieved

Engineering Contradiction:

Improveresistance to ultra-high temperature and high humidityVSAvoidcomposition complexity

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The patent employs composite materials by combining multiple specific components: poly(meth)acrylate compounds of pentaerythritol and/or polyurethane (meth)acrylate compounds of polypentaerythritol, poly(meth)acrylates having isocyanuric rings, urethane di(meth)acrylate compounds synthesized from alicyclic isocyanates, and urethane tri(meth)acrylate compounds having isocyanurate or allophanate bonds. This multi-component composite system achieves superior resistance to ultra-high temperature and high humidity while maintaining abrasion and weather resistance.

Inventive Principle:

Principle #40Composite materials

Solution Approach 2:

The patent utilizes parameter changes by precisely controlling the specific ratios of each component in the coating composition. By optimizing these parameters (component ratios), the cured film achieves enhanced resistance to ultra-high temperature and high humidity environments, transforming the material's performance characteristics to meet severe environmental requirements.

Inventive Principle:

Principle #35Parameter changes

2Reliability

If resin materials are used without protective coating, then ease of manufacture is improved, but surface breakage and erosion occur leading to deterioration of luster and transparency

Engineering Contradiction:

Improvesurface durabilityVSAvoidcoating process complexity

Core Design Contradiction:

ReliabilityVSEase of manufacture

Solution Approach 1:

The patent applies parameter changes by optimizing the specific ratios of coating components to achieve a cured film with superior surface durability. The precise formulation ensures the coating provides enhanced resistance to surface breakage, erosion, and deterioration of luster and transparency, while maintaining manufacturability through a systematic coating process.

Inventive Principle:

Principle #35Parameter changes

3Strength

If existing coating compositions are used, then abrasion resistance is improved, but adherence in high temperature and high humidity environment deteriorates

Engineering Contradiction:

Improveabrasion resistanceVSAvoidadherence in high temperature and high humidity environment

Core Design Contradiction:

StrengthVSReliability

Solution Approach 1:

The patent employs composite materials with specific components including poly(meth)acrylate compounds of pentaerythritol, polyurethane (meth)acrylate compounds of polypentaerythritol, poly(meth)acrylates having isocyanuric rings, urethane di(meth)acrylate compounds from alicyclic isocyanates, and urethane tri(meth)acrylate compounds with isocyanurate or allophanate bonds. This composite system simultaneously achieves high abrasion resistance and maintains excellent adherence even in high temperature and high humidity environments.

Inventive Principle:

Principle #40Composite materials

Solution Approach 2:

The patent utilizes parameter changes by precisely controlling the specific ratios of each component to optimize both abrasion resistance and environmental adherence. The optimized composition ensures that the cured film maintains strong adherence to substrates under severe thermal and humidity conditions while providing high abrasion resistance.

Inventive Principle:

Principle #35Parameter changes

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 forms a cured film with improved abrasion resistance, high heat resistance, and humidity resistance, ensuring excellent adherence to resin materials even in high-temperature and high-humidity conditions, suitable for automotive and building applications.

Implementation Method 1

active-energy-ray-curable coating composition

Methodology Applied

Scientific EffectPhotopolymerization: Photopolymerisation

Data Source

PatentEP4410853B1Active-energy-ray-curable coating composition and molded article

Publication Date: 2025.11.05 DIC CORP

AI summary

Provided is an active-energy-ray-curable coating composition containing components (A) to (D): as the component (A), a compound represented by a general formula (1) or (2), as the component (B), a compound represented by a general formula (3), as the component (C), a compound represented by a general formula (4), (5), or (6), and as the component (D), a compound represented by a general formula (7) or (8). In the total solid content of the components (A) to (D), a content of the component (A) is 1 to 40% by mass, a content of the component (B) is 30 to 85% by mass, a content of the component (C) is 1 to 30% by mass, and a content of the component (D) is 1 to 40% by mass.