WO-2026096304-A1 - COATINGS CONTAINING PHOTONIC PARTICLES FOR UV ABSORPTION

Abstract

Disclosed in certain embodiments is a coating composition and coating formed therefrom comprising a solvent, a binder, a UVA absorbing compound, and photonic particles such as porous metal oxide particles, hybrid metal oxide particles, closed-cell metal oxide particles, or a combination thereof. The coating compositions form a coating that exhibits a UV attenuation boost.

Inventors

• KRAYER, Michael
• Darji, Rupa Hiremath
• Burke, Michael David
• FOLEY, NICHOLAS A.
• BULLIS, Sean William

Assignees

• BASF SE
• BASF CORPORATION

Dates

Publication Date

20260507

Application Date

20251024

Priority Date

20241028

Claims (20)

1. 1. A coating composition comprising: a solvent; a binder; a UVA absorbing compound; and photonic particles selected from porous metal oxide particles, hybrid metal oxide particles, closed-cell metal oxide particles, or a combination thereof, wherein a coating formed from the coating composition exhibits a UV attenuation boost of at least about 50%.
2. 2. The coating composition of claim 1, wherein the UV attenuation boost is at least about 60%, at least about 70%, at least about 80%, at least about 90%, at least about 100%, at least about 110%, at least about 120%, at least about 130%, at least about 140%, at least about 150%, at least about 160%, at least about 170%, at least about 180%, at least about 190%, or at least about 200%.
3. 3. The coating composition of claim 1, wherein the photonic particles are present in the coating from about 0.5 wt% to about 2 wt% based on total dry weight of the coating.
4. 4. The coating composition of claim 1, wherein the UVA absorbing compound is present in the coating at less than about 3 wt%, less than about 2 wt%, less than about 1 wt%, or less than about 0.5 wt% based on total dry weight of the coating.
5. 5. The coating composition of claim 1, wherein the UVA absorbing compound comprises a hindered amine light stabilizer compound.
6. 6. The coating composition of claim 1, further comprising a component selected from: a dispersant; a surfactant; a defoaming agent; a co-dispersant; an acrylic binder; a rheology modifier; a coalescing agent; or a combination thereof.
7. 7. The coating composition of claim 1, comprising the porous metal oxide particles, wherein the porous metal oxide particles have: an average diameter of from about 0.5 pm to about 100 pm; 240878W001 an average porosity of from about 0.45 to about 0.8; and at least one population of pores each having an average pore diameter of from about 100 nm to about 800 nm.
8. 8. The coating composition of claim 7, wherein the porous metal oxide particles have: an average diameter of from about 1 pm to about 75 pm; an average porosity of from about 0.45 to about 0.8; and at least one population of pores each having an average pore diameter of from about 100 nm to about 800 nm.
9. 9. The coating composition of claim 7, wherein the metal oxide of the porous metal oxide particles is selected from the group consisting of silica, titania, alumina, zirconia, ceria, iron oxide, zinc oxide, indium oxide, tin oxide, chromium oxide, and combinations thereof.
10. 10. The coating composition of claim 7, wherein the pores of the porous metal oxide particles form an ordered array or a disordered array.
11. 11. The coating composition of claim 1, comprising the hybrid metal oxide particles, wherein the hybrid metal oxide particles comprise a continuous matrix of a first metal oxide having embedded therein an array of metal oxide particles, the metal oxide particles comprising a second metal oxide, wherein the hybrid metal oxide particles are substantially non-porous.
12. 12. The coating composition of claim 11, wherein the hybrid metal oxide particles have: an average diameter of from about 0.5 pm to about 50 pm; and an average diameter of the metal oxide particles of from about 100 nm to about 600 nm.
13. 13. The coating composition of claim 11, wherein the first metal oxide and the second metal oxide independently comprise a metal oxide selected from silica, titania, alumina, zirconia, ceria, iron oxides, zinc oxide, indium oxide, tin oxide, chromium oxide, and combinations thereof.
14. 14. The coating composition of claim 11, wherein the array of the metal oxide particles is an ordered array or a disordered array. 240878W001
15. 15. The coating composition of claim 1, comprising the closed-cell metal oxide particles, wherein each closed-cell metal oxide particle comprises a metal oxide matrix defining an array of closed-cells, wherein each closed-cell encapsulates a media-inaccessible void volume, wherein the outer surface of the closed-cell metal oxide particle is defined by the array of closed- cells.
16. 16. The coating composition of claim 15, wherein the closed-cell metal oxide particles have: an average diameter of from about 1 pm to about 75 pm; an average void volume diameter of from about 50 nm to about 800 nm; and an average porosity of from about 0.45 to about 0.65.
17. 17. The coating composition of claim 15, wherein the closed-cell metal oxide particles have: an average diameter of from about 0.5 pm to about 50 pm; an average void volume diameter of from about 100 nm to about 800 nm; and an average porosity of from about 0.45 to about 0.65.
18. 18. The coating composition of claim 15, wherein the metal oxide matrix comprises a metal oxide selected from silica, titania, alumina, zirconia, ceria, iron oxides, zinc oxide, indium oxide, tin oxide, chromium oxide, and combinations thereof.
19. 19. The coating composition of claim 15, wherein the array of the closed-cells is an ordered array or a disordered array.
20. 20. A coating derived from the composition of any preceding claim.

Description

240878W001 COATINGS CONTAINING PHOTONIC PARTICLES FOR UV ABSORPTION CROSS-REFERENCE TO RELATED APPLICATIONS [0001] This application claims the benefit of priority from U.S. Provisional Patent Application No. 63/712,884, filed October 28, 2024, the disclosure of which is incorporated herein by reference. TECHNICAL FIELD [0002] Disclosed are coatings compositions that incorporate materials for absorbance or attenuation of ultraviolet radiation. BACKGROUND [0003] Traditional UV absorbers, such as benzotriazoles, have been widely used in coatings to provide protection from ultraviolet (UV) radiation. These absorbers work by absorbing UV light and converting it into less harmful forms of energy, typically heat, preventing UV-induced degradation such as fading, cracking, or yellowing. Benzotriazoles, in particular, are effective because they absorb a broad range of UV light and provide long-lasting protection for coatings on various surfaces, including automotive coatings. However, such materials raise environmental and toxicological concerns, which may impact their future use in coating systems. [0004] These concerns have driven the exploration of alternative UV protection technologies that are more environmentally friendly and safe. There is thus a desire to develop more sustainable materials for UV absorption in view of increasing regulatory pressure and consumer demand for greener products. SUMMARY OF THE DISCLOSURE [0005] The following presents a simplified summary of various aspects of the present disclosure in order to provide a basic understanding of such aspects. This summary is not an extensive overview of the disclosure. It is intended to neither identify key or critical elements of the disclosure, nor delineate any scope of the particular embodiments of the disclosure or any scope of the claims. Its sole purpose is to present some concepts of the disclosure in a simplified form as a prelude to the more detailed description that is presented later. [0006] In at first aspect, a coating composition comprises: a solvent; a binder; a UVA absorbing compound; and photonic particles selected from porous metal oxide particles, hybrid metal oxide particles, closed-cell metal oxide particles, or a combination thereof, wherein a 240878W001 coating formed from the coating composition exhibits a UV attenuation boost of at least about 50%. [0007] In at least one embodiment, the UV attenuation boost is at least about 60%, at least about 70%, at least about 80%, at least about 90%, at least about 100%, at least about 110%, at least about 120%, at least about 130%, at least about 140%, at least about 150%, at least about 160%, at least about 170%, at least about 180%, at least about 190%, or at least about 200%. [0008] In at least one embodiment, the photonic particles are present in the coating from about 0.5 wt% to about 2 wt% based on total dry weight of the coating. [0009] In at least one embodiment, the UVA absorbing compound is present in the coating at less than about 3 wt%, less than about 2 wt%, less than about 1 wt%, or less than about 0.5 wt% based on total dry weight of the coating. [0010] In at least one embodiment, the UVA absorbing compound comprises a hindered amine light stabilizer compound. [0011] In at least one embodiment, the composition further comprises a component selected from: a dispersant; a surfactant; a defoaming agent; a co-dispersant; an acrylic binder; a rheology modifier; a coalescing agent; or a combination thereof. [0012] In at least one embodiment, the composition further comprises the porous metal oxide particles, wherein the porous metal oxide particles have: an average diameter of from about 0.5 pm to about 100 pm; an average porosity of from about 0.45 to about 0.8; and at least one population of pores each having an average pore diameter of from about 100 nm to about 800 nm. [0013] In at least one embodiment, the porous metal oxide particles have: an average diameter of from about 1 pm to about 75 pm; an average porosity of from about 0.45 to about 0.8; and at least one population of pores each having an average pore diameter of from about 100 nm to about 800 nm. [0014] In at least one embodiment, the metal oxide of the porous metal oxide particles is selected from the group consisting of silica, titania, alumina, zirconia, ceria, iron oxide, zinc oxide, indium oxide, tin oxide, chromium oxide, and combinations thereof. [0015] In at least one embodiment, the pores of the porous metal oxide particles form an ordered array or a disordered array. [0016] In at least one embodiment, the composition comprises the hybrid metal oxide particles, wherein the hybrid metal oxide particles comprise a continuous matrix of a first metal oxide having embedded therein an array of metal oxide particles, the metal oxide particles 240878W001 comprising a second metal oxide, wherein the hybrid metal oxide particles are substantially non- porous. [0017] In at least one embodiment, the hybrid me