Using our own shape-control technology, we succeeded in producing nonspherical particles in the shape of biconvex lenses. When the product is used as a light diffuser for optical film, it can provide a higher whole light transmittance than spherical particles. Besides higher haze and transmittance, it can decrease the gloss of the film.
Successful production of biconvex lens-shaped particles
Using our own shape-control technology, we succeeded in producing particles in the shape of biconvex lenses.
*The mean particle size and aspect ratio are controllable in the above ranges.
↑ Size distribution
Applications and features
n Coating film
Optical properties of coated film (Formulation A)
Haze (%)
Whole light transmittance (%)
LMX series (Maximum diameter: 12 μm)
93.3
86.3
Spherical particles (Mean particle size: 12 μm)
93.8
79.1
* Haze and whole light transmittance were measured according to JIS K7105. (Haze meter: Nippon Denshoku)
Nonspherical particles, when used as a light diffuser, provides higher whole light transmittance and lower the loss of light compared to spherical particles. The whole light transmittance increase about 7%.
Formulation of coating solution (Formulation A)
Particles
20 wt parts
Acrylic binder
20 wt parts
Solvent
60 wt parts
Diffused light intensity was continuously measured in the range from -80 to 80 degrees using a goniophotometer. (* The data are examples of measurements.)
Nonspherical particles, when used as a light diffuser, cause higher light diffusion, thereby providing more uniform and brighter light than spherical particles.
n Haze and whole light transmittance
Optical properties of coated film (Formulation A)
Haze (%)
Whole light transmittance (%)
LMX series (Maximum diameter: 5 μm)
69.7
88.8
Spherical particles (Mean particle size: 5 μm)
53.0
86.8
* Haze and whole light transmittance were measured according to JIS K7105.
Nonspherical particles, when used as a light diffuser, cause higher haze and whole light transmittance than spherical particles. (* The data are examples of measurements.)
Formulation of coating solution (Formulation B)
Particles
4 wt parts
Acrylic binder
20 wt parts
Solvent
76 wt parts
n Gloss and intensity of reflected light
1) Reflection properties of light Reflected light was measured in a range of 0 - 90 degrees.
3) Intensity of reflected light
2) Gloss Reflectance of 60 degrees reflected light was measured. * The gloss was measured according to JIS Z8741.
Gloss (%)
LMX series (Maximum diameter: 5 μm)
24.5
Spherical particles (Mean particle size: 5 μm)
41.5
* Haze and whole light transmittance were measured according to JIS K7105. (Haze meter: Nippon Denshoku)
Regular light reflection on the diffusion layer surface is lower in nonspherical particle-applied film than in spherical particle-applied film. The gloss in the direction of regular reflection decreases 17%. (* The data are examples of measurements.)
