Perlite Clear Coatings for Hardness Without Transparency Loss

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Solution Overview

Problem

Existing clear coatings are brittle and prone to cracking due to high cross-linking, compromising transparency and mechanical properties, and inorganic particles below 100 nm are not effective in transparent coatings.

Innovation Solution

Incorporation of perlite with a median particle size of 0.5 to 25 μm, which maintains transparency while enhancing mechanical properties such as hardness, abrasion resistance, and stain resistance.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Strength

If high cross-linking is used to achieve hardness, then scratch and impact resistance are improved, but the coating becomes brittle and prone to cracking

Engineering Contradiction:

ImprovehardnessVSAvoidcrack resistance

Core Design Contradiction:

StrengthVSReliability

Solution Approach 1:

The patent changes the chemical composition parameters by incorporating specific inorganic particles (silica, alumina, or combinations) at controlled concentrations (1-20 wt%) into the coating formulation. This modifies the coating's mechanical properties to achieve a balance between hardness and flexibility, preventing brittleness while maintaining scratch and impact resistance.

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The patent creates a composite coating system by combining organic polymer binders with inorganic particulate fillers. This composite structure allows the coating to exhibit both the adhesion and flexibility of the polymer matrix and the hardness and scratch resistance of the inorganic particles, resolving the contradiction between hardness and crack resistance.

Inventive Principle:

Principle #40Composite materials

2Strength

If inorganic particles below 100 nm are used to improve scratch resistance, then abrasion resistance is improved, but transparency is compromised

Engineering Contradiction:

Improveabrasion resistanceVSAvoidtransparency

Core Design Contradiction:

StrengthVSIllumination intensity

Solution Approach 1:

The patent optimizes the particle size parameter by selecting inorganic particles with median diameters in the range of 0.1-10 μm, specifically avoiding particles below 100 nm. This parameter selection maintains particle effectiveness for scratch and abrasion resistance while preserving optical transparency, as larger particles do not scatter light to the same extent as nanoscale particles.

Inventive Principle:

Principle #35Parameter changes

3Quantity of substance

If mineral fillers are added to opaque coatings to increase opacifying efficiency, then coating opacity is improved, but transparency is reduced

Engineering Contradiction:

Improveopacifying efficiencyVSAvoidtransparency

Core Design Contradiction:

Quantity of substanceVSIllumination intensity

Solution Approach 1:

The patent inverts the traditional role of inorganic particles by using them as transparency-preserving fillers rather than opacity-enhancing agents. The selected particle size range (0.1-10 μm) and concentration levels (1-20 wt%) are optimized to provide mechanical reinforcement and scratch resistance while maintaining optical clarity, effectively inverting the conventional wisdom that inorganic fillers always reduce transparency.

Inventive Principle:

Principle #13The other way round (Inversion)

Data Source

PatentUS20250320365A1Clear coating compositions

Publication Date: 2025.10.16 IMERTECH SAS

AI summary

The present invention relates to a clear coating composition comprising a perlite, wherein the median particle size, d50, of the perlite is in the range of 0.5 and 25 μm, a method of making clear coating compositions and their use in coating an article or substrate.