Recently introduced liquid additives containing alumina and/or silica Nanoparticles can provide improved scratch resistance for general industrial, wood, coil and architectural coatings. These new nano silica and alumina particles range from 20 nm in diameter to 45 nm in diameter. They are dispersed with boundary phase technology in different media and are very easily incorporated by low shear into aqueous, solvent based, solvent free and UV- curing systems. Typically, dosages of 0.5 – 3.0% provide significant and long-term scratch and/or abrasion resistance without adversely affecting gloss, color, clarity or other physical properties of the high gloss and semi-gloss coatings. The inclusion of surface-active modified poly dimethyl siloxanes by its orientation and crosslinking at the coatings surface enhances the performance of the Nanoparticles. Where high gloss is not issue, combinations of the larger 60 to 80 nm alumina particles that are dispersed with boundary phase technology in different media and are very easily incorporated by low shear into aqueous, solvent based, solvent free and UV- curing systems. Typically, dosages of 1.0 – 6.0% provide significant and long-term scratch with waxes and matting agents to allow the formulation of semi-gloss, semi- transparent to opaque scratch resistant coatings.
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