Polymeric Duller Particles for Matte Coatings
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Solution Overview
Problem
Existing matte coatings using duller particles face issues with uncontrolled light interaction leading to graying, haziness, and loss of clarity and film properties, while attempts to address these often sacrifice clarity or film integrity for a matte effect, and solvent-based compositions have environmental and health concerns.
Innovation Solution
Aqueous compositions comprising polymeric duller components with specific particle sizes and binder components, forming coatings with tunable gloss control and burnish resistance without compromising clarity or film properties, using acrylic-based multi-stage and single-stage polymers with controlled particle sizes and refractive indices.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If duller particles are added to reduce gloss, then matte effect is improved, but clarity and color intensity are lost due to uncontrolled light scattering
Solution Approach 1:
The patent changes the refractive index parameter of the duller particles by selecting specific organic polymers with refractive indices closely matched to the binder system (1.47-1.53 vs 1.49-1.53). This parameter matching minimizes light scattering while maintaining matte effect through controlled surface roughness, thereby preserving clarity and color intensity.
Solution Approach 2:
The patent applies local quality by creating controlled surface roughness only at the coating surface level while keeping the bulk film structure intact. The duller particles are distributed to provide surface matting without compromising the underlying film integrity, allowing the coating to maintain both matte appearance and optical clarity.
2Illumination intensity
If duller particles are added to reduce gloss, then matte effect is improved, but film integrity and flexibility are disrupted
Solution Approach 1:
The patent uses composite materials by combining organic polymer duller particles with an organic binder system specifically formulated to be compatible with these particles. The binder and filler are selected to work synergistically, where the binder holds the duller particles in place while maintaining film flexibility and integrity, preventing the disruption caused by inorganic dullers.
Solution Approach 2:
The patent changes the chemical composition parameters of the binder system to match the organic nature of the duller particles. By selecting binders with compatible chemical structures and properties, the system achieves strong interfacial adhesion between binder and filler, maintaining film integrity while enabling matte effect.
3Illumination intensity
If inorganic dullers are used at high concentrations, then matte effect is improved, but chalky or hazy appearance results
Solution Approach 1:
The patent changes the refractive index parameter and chemical composition of the duller particles from inorganic to organic polymers with refractive indices (1.47-1.53) closely matched to the binder. This parameter matching eliminates the haze and chalkiness associated with inorganic dullers, allowing high concentrations to be used for strong matte effect while maintaining clear, vibrant appearance.
4Reliability
If solvent-based compositions are used, then coating performance is improved, but environmental and health concerns arise
Solution Approach 1:
The patent changes the solvent parameter from organic solvents to water as the continuous phase. The composition uses water as the solvent with organic binders and fillers dispersed in it, eliminating VOC emissions while maintaining coating performance through careful selection of water-compatible binder and filler systems that cure to form durable films.
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 durable matte finishes with maintained clarity, color intensity, and film properties, along with burnish resistance, while being free from solvent-based composition drawbacks, offering a versatile and environmentally friendly solution.
Implementation Method 1
duller particles...function by roughening the surface of the film...uncontrolled interaction of light with the duller particles can cause graying, haziness, cloudiness
Implementation Method 2
careful selection of refractive index between particle and matrix...polymer particles that provides coatings having tunable gloss control...with no appreciable loss of clarity
Data Source
AI summary
The present invention provides aqueous matte coating compositions comprising a binder component B) and a polymeric duller component A) composed of particles of one or more multi-stage copolymer or single stage crosslinked (co)polymer, e.g. crosslinked t-butyl (meth)acrylate, the duller component particles A) having an average diameter of 1-20 µm. Components A) and B) are compatible. Preferably, the duller component A) is acrylic; more preferably, components A) and B) are acrylic. The aqueous compositions provide matte coatings having haptic or feel (soft touch) properties, film and appearance properties, including burnish resistance and low color loss.