Retroreflective composition for industrial 3d spraying of large surfaces

Abstract

The invention provides a retror effective ink, coating or paint composition consisting, based on the total weight of the composition, of: ⋅ 15-75 wt. % of solvent; 1-85 wt. % of spherical glass beads having a median particle diameter D50, as measured with laser diffraction, between 1 and 150 μm, and a refractive index, measured at a wavelength λ of 589 nm, between 1.5 and 2.8, wherein optionally at least part of the spherical glass beads are hemi spherically coated with a light-reflective coating; 0.05-2.5 wt. % of one or more thickeners; and 0.20-4.5 wt. % of synthetic pigment flakes having an average diameter between 1 and 75 μm, a thickness smaller than 1 pm and an aspect ratio (flake diameter/thickness) of at least 10; 0-2 wt. % of one or more pigment flakes or particles (D) other than synthetic pigment flakes (A), (B) and (C); ⋅ 0-30 wt. % of one or more further ingredients, wherein the combined amount of the synthetic pigment flakes (A), (B) and (C) and the one or more pigments flakes or particles (D) is between 0.20 and 4.5 wt. %.