Inorganic oxide coating
View Patent ↗The invention relates to a coating composition comprising an inorganic oxide precursor A MOx based on at least one inorganic element A selected from the group consisting of aluminum, silicium, titanium, zirconium, niobium, indium, tin, antimony, tantalum, and bismuth; and an inorganic oxide precursor B MOx based on at least one inorganic element B selected from the group consisting of scandium, yttrium, lanthanum, and the lanthanoids; wherein A MOx and B MOx are capable of forming a mixed inorganic oxide. A coating made from this composition shows enhanced resistance to hydrolysis. The invention also relates to a process for applying a coating on a substrate using such composition, more specifically to a liquid coating composition for use in a process of applying an anti-reflective coating on transparent substrate; to a coated substrate obtained with such process, and to an article, like a solar panel, comprising such coated substrate.
1. A coating composition comprising:
an inorganic metal oxide precursor A MOx based on at least one inorganic metal element A selected from the group consisting of aluminum, silicium, titanium, zirconium, niobium, indium, tin, antimony, tantalum, and bismuth;
an inorganic metal oxide precursor B MOx based on at least one inorganic metal element B selected from the group consisting of scandium, yttrium, lanthanum, and the lanthanoids; and
core-shell nanoparticles as a pore forming agent, wherein the nanoparticles have an inorganic shell and an organic core, and wherein
the inorganic metal oxide precursors A MOx and B MOx are capable of forming a mixed inorganic oxide, and wherein
the coating composition comprises 80 to 99.5 parts by weight of the inorganic metal oxide precursor A MOx , and 0.5 to 20 parts by weight of the inorganic metal oxide precursor B MOx based on 100 parts by weight of the inorganic metal oxide precursors A MOx and B MOx , and wherein
the coating composition is anti-reflective.
2. The coating composition according to claim 1 , wherein the at least one inorganic metal element A is selected from the group consisting of aluminum, silicium, titanium, and zirconium.
3. The coating composition according to claim 1 , wherein the inorganic metal oxide precursor A MOx is based on silicium.
4. The coating composition according to claim 1 , wherein the at least one inorganic metal element B is selected from the group consisting of scandium, yttrium, dysprosium, thulium, and lutetium.
5. The coating composition according to claim 1 , wherein the inorganic metal oxide precursor B MOx is based on yttrium.
6. The coating composition according to claim 1 , which comprises 85-99.0 parts by weight of the inorganic metal oxide precursor A MOx and 1.0 to 15 0.5 to 20 parts by weight of inorganic metal oxide precursor B MOx based on 100 parts by weight of the inorganic metal oxide precursors A MOx and B MOx .
7. The coating composition according to claim 1 , wherein the coating composition comprises the inorganic metal elements A and B in a molar ratio of the inorganic metal element A to the inorganic metal element B from 100:1 to 1:2.
8. The coating composition according to claim 1 , further comprising at least one solvent.
9. The coating composition according to claim 1 , wherein the inorganic shell of the core-shell nanoparticles is based on the inorganic oxide precursor A MOx .
10. A process for applying an inorganic oxide coating on a substrate comprising the steps of:
a) providing a coating composition according to claim 1 ;
b) applying the coating composition to the substrate.
11. The process according to claim 10 , comprising the steps of
a) providing a liquid coating composition;
b) applying the coating composition to the substrate;
c) drying the applied coating, and optionally,
d) curing the coating.