Electrowetting Display Ink Dispersant Technology

Electrowetting displays (EWD) are favored for e-books and wearables due to low power consumption and high contrast. However, their color inks face challenges like low dye solubility and light degradation. One manufacturer’s Green ink, for example, showed only 35% aperture ratio and >20ms response due to dye aggregation.

Chemi Tech’s breakthrough anthraquinone-anchored dispersant features:

Targeted Anchoring: Anthraquinone rings form π-π stacking with dyes (e.g., Disperse Red FB) for strong adsorption;

Polyisobutene Solubilizing Chains: 22-carbon chains provide steric protection in nonpolar solvents (n-decane/dodecane), boosting solubility 300%;

Anti-Degradation Shield: Intramolecular quenching groups absorb UV energy, extending dye life >10,000 hours.

Case Study: E-Reader Color Ink Optimization

A client using Chemi Tech’s dispersant (dye:dispersant=1:1.5) achieved:

High Solubility: 10wt% dye loading with absorbance increased by 2.29× (vs. undispersed);

Rapid Response: Ink contraction/spreading speed ≤5ms, pixel aperture ratio >50%;

Stability: No phase separation after accelerated aging (60°C/90% RH), particle size stabilized at 759nm.

This solution enables e-paper products to maintain high color saturation and contrast in bright environments.