Porous Polyurethane Particles for Automotive Interior Matting
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Solution Overview
Problem
Current particles used for matting coatings, such as those based on polyurethanes without lateral alkyl groups, often fail to provide a strong enough matting effect, which is necessary for applications like automotive interiors where shiny surfaces are undesirable due to reflection issues.
Innovation Solution
Development of spherical particles with specific size and pore characteristics, comprising polyurethanes with urea groups and produced using aliphatic or cycloaliphatic diisocyanates, which are designed to have a strong matting effect and pleasant grip when used in coatings.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If conventional polyurethane particles without lateral alkyl groups are used for matting coatings, then the coating achieves a matte surface, but the matting effect is not strong enough for applications like automotive interiors where high reflectivity reduction is required
Solution Approach 1:
The patent applies porous materials by creating particles with a specific porous structure characterized by a pore volume of 0.2 to 0.8 mL/g and a mean pore diameter of 0.5 to 2.0 μm. This porous structure increases light scattering and absorption, thereby significantly enhancing the matting effect and reducing reflectivity for automotive interior applications
Solution Approach 2:
The patent applies parameter changes by precisely controlling the pore volume (0.2 to 0.8 mL/g) and mean pore diameter (0.5 to 2.0 μm) of the particles. These parameter optimizations transform conventional polyurethane particles into high-performance matting agents that effectively reduce reflectivity while maintaining manufacturing feasibility
2Ease of manufacture
If particles with larger size are used to enhance matting effect, then light scattering improves, but the tactile sensation becomes less pleasant
Solution Approach 1:
The patent applies local quality by creating particles with non-uniform pore distribution and varying local densities within each particle. This local heterogeneity optimizes light scattering for strong matting effects while the overall particle size remains within the optimal range for pleasant tactile sensation
Solution Approach 2:
The patent applies dynamics by ensuring the particles have a spherical shape with high roundness (0.8 to 1.2), which provides consistent and pleasant tactile feedback. The dynamic balance between particle size, shape, and internal porous structure achieves both strong matting and comfortable touch
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 particles achieve a significant matting effect and pleasant tactile experience, making them suitable for applications requiring reduced reflectivity and improved surface feel, such as automotive interiors.
Implementation Method 1
A matting effect can be achieved, for example, by adding particles to the coating mixture. A strong matting effect is particularly important.
Implementation Method 2
The particles achieve a significant matting effect and pleasant tactile experience, making them suitable for applications requiring reduced reflectivity
Data Source
Figure 1~2
AI summary
The invention relates to spherical particles having an average diameter (numerical average) in the range of 1 to 100 µm, comprising at least one organic polymer, wherein the particles have one or more open pores that have diameters in the range of 1 to 90% of the particle diameter and a depth of at least 10% of the particle diameter.