Retroreflective composition for industrial 3D spraying of large surfaces

A composition selected from a retroreflective ink, a coating, or a paint, wherein:

• based on the total weight of the composition, the composition consists of:
• from 15 wt. % to 75 wt. % solvent;
• from 1 wt. % to 80 wt. % spherical glass beads having a median particle diameter D50, as measured with laser diffraction, from 1 μm to 150 μm, and a refractive index, measured at a wavelength 2 of 589 nm, from 1.5 to 2.8;
• from 0.05 wt. % to 2.5 wt. % one or more thickeners;
• from 0.20 wt. % to 4.5 wt. % synthetic pigment flakes having an average diameter from 1 μm to 75 um, a thickness less than 1 μm, and an aspect ratio of flake diameter to flake thickness of at least 10,
• from 0 to 2 wt. % of one or more pigment flakes or particles other than the synthetic pigment flakes;
• and
• from 0 to 30 wt. % of one or more further ingredients;
• the synthetic pigment flakes are chosen from (A), (B), (C), or a combination thereof:
• (A) metal flakes or synthetic mica flakes, optionally coated with at least one layer of one or more components selected from the group consisting of metal oxides, metals, metal sulfides, titanium suboxides, titanium oxynitrides, FeO (OH), SiO2, B2O3, GeO2, MgF2, metal alloys, and rare earth compounds, and optionally coated with an outer layer comprising one or more colorants and a binder;
• (B) flakes comprising Al2O3, SiO2, glass, ceramic, graphite, or mica platelets coated with at least one layer of one or more components selected from the group consisting of metal oxides, metals, metal sulfides, titanium suboxides, titanium oxynitrides, FeO (OH), SiO2, B2O3, GeO2, metal alloys, and rare earth compounds, and optionally coated with an outer layer comprising one or more colorants and a binder;
• (C) flakes comprising Al2O3 platelets doped with one or more components selected from the group consisting of TiO2, ZrO2, SiO2, SnO2, In2O3, ZnO, and iron oxide, coated with at least one layer of one or more components selected from the group consisting of metal oxides, metals, metal sulfides, titanium suboxides, titanium oxynitrides, FeO (OH), SiO2, B2O3, GeO2, metal alloys, rare earth compounds, and optionally coated with an outer layer comprising one or more colorants and a binder;
• a combined amount of the synthetic pigment flakes and the one or more pigment flakes or particles in the composition is from 0.20 wt. % to 4.5 wt. %;
• and
• the average diameter of the synthetic pigment flakes is greater than 30% of the median particle diameter D50 of the spherical glass beads.