The present invention relates to compositions with self-cleaning properties. More particularly, the invention concerns coatings or paints comprising particles coated with a catalytically active composition. In particular, a self-cleaning coating composition (paint) is provided, comprising micro-size
The present invention relates to compositions with self-cleaning properties. More particularly, the invention concerns coatings or paints comprising particles coated with a catalytically active composition. In particular, a self-cleaning coating composition (paint) is provided, comprising micro-sized particles coated with a functional layer, wherein the micro-sized particles are hollow or solid beads, or any combination/ratio of hollow and solid beads, wherein the beads comprise one or more material(s) selected from ceramic material(s); polymeric material(s); cermet material(s); metallic material(s); pigmented material(s); light-absorbing and/or light reflecting material(s); including any combination thereof, wherein said layer is covalently bound to said particles, wherein the photocatalytic layer comprises TiO2 in the crystal form of anatase; and wherein the coating composition (paint) comprises less than 0.1 anatase particles derived/released from the micro-sized beads, determined as weight/weight of released anatase/total amount of anatase. The invention provides paint essentially without presence of unbound anatase crystals which is highly undesired, as it is believed that their presence has a negative influence on essential components of the paint, such as binder, pigment and/or additives and furthermore, anatase may cause eye, skin, and respiratory tract irritation.
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1. A self-cleaning coating composition comprising a binder and micro-sized particles coated with a photocatalytic layer, wherein the micro-sized particles are hollow or solid beads, or any combination/ratio of hollow and solid beads, wherein the beads comprise one or more material(s) selected from t
1. A self-cleaning coating composition comprising a binder and micro-sized particles coated with a photocatalytic layer, wherein the micro-sized particles are hollow or solid beads, or any combination/ratio of hollow and solid beads, wherein the beads comprise one or more material(s) selected from the group consisting of ceramic material(s); polymeric material(s); cermet material(s); metallic material(s); pigmented material(s); light-absorbing and light reflecting material(s); and a combination thereof, wherein said photocatalytic layer is covalently bound to said particles after adsorbed water is evaporated from particle surfaces, wherein the photocatalytic layer comprises TiO2 in the crystal form of anatase; and wherein the coating composition comprises less than 0.1 percent free anatase particles derived/released from the micro-sized beads, determined as weight/weight of released anatase/total amount of anatase. 2. The self-cleaning coating composition of claim 1, wherein more than 95% of the particles have an equivalent diameter in the range of 0.5-20μ. 3. The self-cleaning coating composition of claim 1 wherein the photocatalytic layer provides one or more of: (a) reduction in growth of organisms selected from: bacteria, algae, lichen, yeasts and/or moulds; (b) increase in adhesion strength between an organic binder and a bead by chemical bonding; (c) increase in abrasion resistance of the paint film; (d) increase in weather resistance and/or UV-stability; (e) decomposition and/or oxidation of undesired organic matter and/or dirt; and (f) improvement of wetting property of the coating composition. 4. The self-cleaning coating composition of claim 1, wherein the photocatalytic layer comprises one or more of: (a) a photocatalyst and/or n-type semiconductor having a band gap in the range of 3.1-4.1 eV; (b) a photoconductive material/composition; and (c) a photocatalytic material/composition; optionally comprising one or more catalyst(s) selected from the group consisting of: TiO2, ZnO, WO3, SnO2, CaTiO3, Bi2S3, Cu2O, Fe2O3, ZrO2, SiC and TixZr(i-x)O2 (O
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