Improved latex film-glass adhesion under wet environments by using an aluminum polyphosphate filler

Non-crystalline aluminum polyphosphate (AIPP) was added as a filler to poly (vinyl acetate) latex and the resulting dispersion was used both as a glass coating and as a glass-to-glass adhesive. Latex-coated glass samples were subjected to a grid adhesion test following the ASTM D 3359 standard, in wh ich the samples are immersed in water. AIPP improves the latex polymer film adhesion to glass, as evidenced by coating film and adhesive joint stabili ties. This is explained in terms of the formation of Al3+ ion bridges betwe en the polymer-polyphosphate bicontinuous composite film and the glass surf ace.