Silica-Including Microcapsule Resin Particles for Light Diffusibility
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Solution Overview
Problem
Conventional silica-including microcapsule particles lack sufficient light scattering and diffusing properties, making them inadequate for achieving high light diffusibility and opacifying effects in cosmetic materials, paint compositions, and light diffusion films.
Innovation Solution
Silica-including microcapsule resin particles with a crosslinked polymer outer shell and a porous structure containing interconnected silica particles, produced through suspension polymerization and gellation of silicone alkoxide, enhance light diffusibility and opacifying properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If conventional hollow resin particles or microcapsule particles including silica particles are used, then the structure is simple and easy to manufacture, but the light scattering property and light diffusing property are insufficient
Solution Approach 1:
The invention uses composite particles comprising a resin particle and a silica particle, where the silica particle has a specific density of 0.15 g/cm³ or less and a pore volume of 0.6 mL/g or more. This composite structure combines the advantages of resin particles (ease of manufacture) with silica particles (superior light scattering), achieving high light diffusing property while maintaining manufacturing feasibility.
Solution Approach 2:
The silica particle is designed with a porous structure having a pore volume of 0.6 mL/g or more and specific density of 0.15 g/cm³ or less. This porous structure enhances light scattering capability by creating multiple light paths and increasing the refractive index contrast, thereby improving light scattering property without requiring complex particle geometries.
2Illumination intensity
If hollow resin particles are used to provide inner space, then manufacturing is simple, but the light diffusing property and opacifying property are insufficient
Solution Approach 1:
The invention combines resin particles with specially designed silica particles (pore volume ≥0.6 mL/g, specific density ≤0.15 g/cm³) to achieve high light diffusing property and opacifying property. This composite approach maintains relative manufacturing simplicity while dramatically improving optical properties compared to hollow resin particles alone.
Solution Approach 2:
The invention achieves superior light diffusing property by controlling specific parameters of the silica particle: pore volume of 0.6 mL/g or more and specific density of 0.15 g/cm³ or less. These parameter optimizations enable enhanced light scattering without fundamentally changing the manufacturing process complexity.
3Illumination intensity
If silica particles with high density are used, then the particle structure is stable, but the light scattering property is reduced
Solution Approach 1:
The invention uses silica particles with a porous structure having specific density of 0.15 g/cm³ or less and pore volume of 0.6 mL/g or more. The porous structure reduces the effective density of silica particles while maintaining structural stability, thereby enhancing light scattering property through increased refractive index contrast without sacrificing particle integrity.
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 silica-including microcapsule resin particles exhibit excellent light diffusibility and opacifying properties, with a porous structure contributing to improved oil absorption and reduced porosity, making them suitable for various applications including cosmetics, paint compositions, and light diffusion films.
Implementation Method 1
a method of obtaining microcapsule particles including a single or a plurality of silica particle(s) by applying a method of synthesizing hollow particles having a micron size to prepare microcapsule particles including a silica precursor, and thereafter, performing a sol-gel reaction
Implementation Method 2
it is impossible to state that hollow resin particles of Patent Documents 1 and 2 and microcapsule particles including a single or a plurality of silica particle(s) of Non-Patent Document 1 have, for example, sufficient light scattering property
Data Source
AI summary
Silica-including microcapsule resin particles including an outer shell constituted of a crosslinked polymer and a cavity partitioned with the outer shell, in which the silica-including microcapsule resin particles contain inside the cavity a porous structure in which silica particles are mutually connected, and have a volume average particle diameter of 0.5 to 100 μm.