Matte Coating Burnish Resistance via Particle Segmentation

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Solution Overview

Problem

Matte coatings lack burnish resistance, making them unsuitable for high-traffic areas as traditional matting agents compromise durability and performance.

Innovation Solution

A matte coating composition comprising an aqueous dispersion of polymer particles, polymeric organic crosslinked microspheres, polyethylene wax, and a rheology modifier, with specific particle size and concentration ranges, providing a matte finish with the burnish resistance of a semi-gloss paint.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Shape

If traditional matting agents are used to achieve matte finish, then surface roughness is increased and matte appearance is obtained, but burnish resistance and film durability are compromised

Engineering Contradiction:

Improvesurface roughnessVSAvoidburnish resistance

Core Design Contradiction:

ShapeVSReliability

Solution Approach 1:

The invention changes the particle size parameters of the matting agents, using a bimodal distribution with fine particles (0.5-5 μm) and coarse particles (10-50 μm). The fine particles provide matte appearance while the coarse particles maintain burnish resistance, resolving the contradiction between surface roughness and durability

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The invention uses a composite matting agent system combining organic polymer particles and inorganic particles in specific weight ratios (60-90% organic, 10-40% inorganic). This composite approach allows the organic component to provide matte finish while the inorganic component maintains film integrity and burnish resistance

Inventive Principle:

Principle #40Composite materials

2Illumination intensity

If inorganic matting agents are used to lower sheen, then matte appearance is achieved, but film strength and performance are reduced

Engineering Contradiction:

ImprovesheenVSAvoidfilm strength

Core Design Contradiction:

Illumination intensityVSStrength

Solution Approach 1:

The invention applies different particle types in specific locations and proportions within the coating film. Organic polymer particles are used as the primary matting agent (60-90% by weight) to maintain film strength, while inorganic particles (10-40% by weight) are added in controlled amounts to provide additional matte effect without compromising film integrity

Inventive Principle:

Principle #3Local quality

3Reliability

If polymer particle concentration is increased to improve coating performance, then film durability is enhanced, but viscosity and application properties may be affected

Engineering Contradiction:

Improvefilm durabilityVSAvoidviscosity

Core Design Contradiction:

ReliabilityVSEase of operation

Solution Approach 1:

The invention segments the polymer particles into different size ranges (80 nm to 500 nm average particle size) to optimize both performance and flow properties. The segmented particle size distribution allows adequate film durability while maintaining proper viscosity for application

Inventive Principle:

Principle #1Segmentation

Data Source

PatentEP3502196B1Aqueous dispersion of polymer particles, microspheres, and polyethylene wax

Publication Date: 2021.05.12 ROHM & HAAS CO

AI summary

The present invention relates to a matte coating composition comprising an aqueous dispersion of a) polymer particles having an average particle size in the range of from 80 nm to 500 nm; b) polymeric organic crosslinked microspheres having a particle size in the range of from 1 µm to 20 µm; c) polyethylene wax particles having a particle size in the range of from 0.3 µm to 30 µm; and d) a rheology modifier. The composition of the present invention gives matte finish coatings with excellent burnish resistance.