Introduction

DENSON NA high-transparency nano color paste achieves D90≤80nm and visible-light transmittance ≥92% through controlled nano-dispersion, enabling its use in optical films, light guides, and transparent coatings. This article reviews the dispersion mechanism, three application cases, key selection parameters, and batch control points.

Technical Features and Mechanism

High-transparency nano color paste is defined as a pigment dispersion in which the primary particle size is reduced to below 100nm through bead milling, such that light scattering at visible wavelengths is minimized and transmittance approaches that of the pure resin. The NA series from Dongguan DENSON Functional Materials Co., Ltd. uses polymer dispersants with anchoring groups that adsorb on the pigment surface and sterically stabilize particles in the binder matrix.

Figure 1: NA high-transparency nano color paste samples in clear media

Application Case 1: PET Optical Film

A PET optical film producer used NA series red paste to coat a 100μm PET base. At 3% pigment loading, the film reached transmittance 93.5% at 550nm, haze 1.8%, and ΔE batch-to-batch ≤0.3 (ASTM D1003). The nano-dispersed particles did not agglomerate after 40°C storage for 7 days.

Application Case 2: PC Light Guide Plate

A PC light guide plate manufacturer injected NA blue paste at 0.5% into PC pellets. The D90 of the dispersed pigment was 75nm (ISO 13321), maintaining LGP brightness uniformity above 95% without visible agglomerates. The paste showed no bleed-out after 1000h QUV aging (ΔE≤2.0).

Figure 2: Ceramic nano bead mill used for NA series production

Application Case 3: UV-Cured Clear Coat

A UV-cured clear coat for consumer electronics used NA yellow paste at 2%. The cured film achieved Yellowness Index (YI) ≤1.5 (ASTM E313) and pencil hardness 2H (GB/T 6739). Cure energy was 800mJ/cm², with no blooming or migration after 500h heat aging at 80°C.

Key Selection Parameters

Figure 3: Portable colorimeter used for on-line batch ΔE check

Conclusion

DENSON NA high-transparency nano color paste achieves D90≤80nm, transmittance ≥92%, and batch ΔE≤0.3 through steric nano-dispersion, making it suitable for optical films, light guides, and UV-cured transparent coatings. More product details are available at DENSON product list and official literature.

Frequently Asked Questions

Q1: What is the maximum pigment loading for NA series?
A: In clear coatings 2-5% is typical; in optical films 0.5-3% depending on required color depth.

Q2: How long is the shelf life?
A: 12 months sealed at 25°C; after opening, use within 3 months and stir before use.

Q3: Which resins are compatible?
A: NA series is compatible with acrylates, polycarbonates, PET, and most UV-curable systems; test compatibility first for new resins.

Q4: How to verify dispersion quality?
A: Measure D90 by ISO 13321 laser diffraction; D90≤80nm indicates acceptable nano-dispersion.

Q5: Does NA paste affect cure kinetics?
A: At ≤3% loading, no significant effect on UV cure energy (≤1000mJ/cm²); avoid high-load dark colors that absorb UV.