Coating Composition High Refractive Index Binder Light Reflectance
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Solution Overview
Problem
Current coating compositions are limited in their Light Reflectance Value (LRV) for a given chroma, which restricts their ability to make rooms lighter, especially in small, dark spaces where increased lightness is desired without compromising decorative color.
Innovation Solution
A colored coating composition comprising a white base paint with specific opacifying pigments and extenders, along with photoluminescent compounds, is developed to achieve a higher LRV than traditional compositions, allowing for increased light reflectance while maintaining or enhancing chroma, thereby making rooms appear lighter.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If traditional coating compositions are used to provide decorative color with sufficient chroma, then the color intensity is maintained, but the Light Reflectance Value (LRV) is limited and the room appears darker
Solution Approach 1:
The patent applies parameter changes by modifying the refractive index parameter of the coating composition. It uses a binder with a refractive index of at least 1.70 (preferably at least 1.75) in combination with specific pigment concentrations and ratios. This parameter change in the optical properties of the binder enables the coating to achieve higher LRV (above 70) while maintaining sufficient chroma, resolving the contradiction between light reflectance and color intensity.
Solution Approach 2:
The patent employs composite materials by combining specific types of pigments (including transparent pigments, opaque pigments, and fluorescent pigments) with a specially selected binder having high refractive index. This composite formulation creates a synergistic effect where the binder's optical properties enhance the light-reflecting capabilities of the pigment mixture, achieving both high LRV and maintained chroma simultaneously.
2Illumination intensity
If more white pigment is added to increase LRV, then light reflectance improves, but the chroma and color intensity are reduced
Solution Approach 1:
Instead of changing the pigment composition, the patent changes the binder's refractive index parameter. By using a binder with refractive index ≥1.70, the system achieves enhanced light reflection through the binder-pigment interface, allowing high LRV to be obtained without increasing white pigment content, thus preserving chroma.
Solution Approach 2:
The high refractive index binder acts as an intermediary that enhances the optical interaction between light and pigments. It mediates the light reflection process by creating stronger optical contrast at the pigment-binder interfaces, thereby improving LRV without requiring additional white pigment that would dilute the color intensity.
3Productivity
If the room size is reduced to provide more space for other purposes, then the building becomes more efficient, but the room becomes darker and less desirable
Solution Approach 1:
The patent changes the optical parameters of the coating by using a high refractive index binder (≥1.70) which significantly enhances light reflection. This allows small rooms to maintain high lightness levels despite reduced dimensions, making them more desirable while preserving the space efficiency benefits of compact design.
Solution Approach 2:
The patent utilizes color optical properties by selecting pigments and binder combinations that maximize light reflection across the visible spectrum. This optical optimization makes small rooms appear brighter and more spacious, counteracting the darkening effect of reduced room size while maintaining the productivity benefits of efficient space utilization.
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 effectively increases the LRV of the coating composition, making rooms appear lighter than possible with existing coatings of similar chroma, enhancing lightness while maintaining or increasing color intensity, thus addressing the limitations of current technologies.
Implementation Method 1
the white base paint comprising a film-forming polymer, a liquid carrier, one or more opacifying white pigments and one or more extenders, the coloured coating composition having a light reflectance value Y less than 110, and greater than that defined by the equation
Data Source
AI summary
A colored coating composition comprising a white base paint and at least one colored pigment in a form that can be readily mixed with the white base paint, the white base paint comprising a film-forming polymer, a liquid carrier, one or more opacifying white pigments and one or more extenders, the colored coating composition having a light reflectance value Y less than 110, and greater than that defined by the equation Y=mC+K, where 25>C>1.0, C being the chroma of the colored coating composition, m and K being empirical coefficients selected according to the type and number of the type of the at least one colored pigment, and dependant on the hue angle of the coating composition.