Low-migration reactive phosphates are gaining mainstream acceptance.
Formulators are moving away from non-reactive phosphate additives. Preference is shifting toward acrylate-functional, UV-copolymerizable grades such as HC5110 and
EBECRYL 170. These reactive types minimize additive blooming, surface hazing and loss of performance after boiling-water exposure.
Well-documented drawbacks of phosphate-based adhesion promoters
Formulators across regions report recurring practical challenges:
1. High-acid-value phosphates can accelerate decomposition of alkaline photoinitiators and shorten shelf-life of finished formulations.
2. Excessive loading tends to impair water-resistance and salt-spray performance of cured films.
3. While delivering excellent adhesion on aluminium and metallized VM-films, certain phosphates may cause substrate attack / bite-back on selected plastic substrates.
Field recommendation: typical dosage 1-3 wt%; maximum 4 wt% is generally not advised. Storage-stability testing is mandatory for every new formulation.
Emerging high-growth applications
Demand for phosphate acrylate adhesion promoters is rising rapidly for UV-curable coatings on photovoltaic back-sheets and UV inks for consumer-electronic glass substrates.
Post time: Aug-21-2026
