High refractive index is a feature!
Melamine/benzoguanamine resin fine particles (EPOSTAR™)
EPOSTAR series consists of spherical thermosetting resin particles used as matting agents to be added to inks, coatings, films, etc. Among EPOSTAR particles, those made from benzoguanamine resin have a higher refractive index (n=1.66) than general organic particles (acrylic, styrene, etc.), and exhibit matting performance by significantly adjusting the balance between haze and light transmittance.
Benzocyanine Structure
EPOSTAR resin diffuses light and creates a matte finish.
It has excellent durability (does not dissolve or swell) against a wide range of solvents, including alcohols (ethanol, IPA), ketones (MEK, MIBK), and aromatics (xylene, toluene).
Since it is a cross-linked resin particle that is durable against multiple solvents, it has high dispersibility in various solvents and can be dispersed stably when mixed into paints and inks. Please contact us here for specific dispersion methods.
Its thermal decomposition temperature is around 200℃, giving it high heat resistance.
We have a lineup of multiple products with different particle sizes and particle size distributions.
| Part number | MS | M05 | L15 | M30 |
|---|---|---|---|---|
| type | Benzoguanamine Formaldehyde condensation products | Benzoguanamine/Melamine Formaldehyde condensation products | ||
| chemical structure | |  | ||
| Average particle size (μm) | 2 | 5 | 9 | 3 |
| Particle size distribution | wide | Medium | ||
| Refractive index | 1.66 | |||
| true specific gravity | 1.4 | |||
| form | powder | |||
| pyrolysis temperature | Around 200℃ | |||
High-refractive organic microparticles
Benzoguanamine resin microparticles with n=1.66 for matte finishes
Find our more
Optical film brightness
Spherical melamine/benzoguanamine particles improve diffusion
Find our more
Anti-blocking Agent Basics and Guide
A step-by-step guide to selecting fine particles. Selection points from a fine particle professional!
Find our more
