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CN-121975349-A - Closed cell metal oxide particles

CN121975349ACN 121975349 ACN121975349 ACN 121975349ACN-121975349-A

Abstract

The present invention relates to a composition comprising closed cell metal oxide particles, each closed cell metal oxide particle comprising a metal oxide matrix defining an array of closed cells, each closed cell encapsulating medium having an inaccessible void volume, wherein an outer surface of the closed cell metal oxide particles is defined by the array of closed cells, wherein the closed cell metal oxide particles have an average diameter of about 0.5 μm to about 100 μm and an average porosity of about 0.3 to about 0.7.

Inventors

  • QU LIANGJING
  • ODORISIO PAUL ANGELO
  • M.D. Burke
  • R. H. dalky

Assignees

  • 巴斯夫欧洲公司

Dates

Publication Date
20260505
Application Date
20210721
Priority Date
20200722

Claims (20)

  1. 1. A composition comprising closed cell metal oxide particles, each closed cell metal oxide particle comprising: a metal oxide matrix defining an array of closed cells, each closed cell encapsulating medium having a non-accessible void volume, wherein an outer surface of the closed cell metal oxide particles is defined by the array of closed cells, Wherein the closed cell metal oxide particles have an average diameter of about 0.5 μm to about 100 μm and an average porosity of about 0.3 to about 0.7.
  2. 2. The composition of claim 1 wherein the closed cell metal oxide particles have an average diameter of from about 0.5 μm to about 30 μm.
  3. 3. The composition of claim 1, wherein the closed cell metal oxide particles exhibit increased attenuation in the ultraviolet spectrum.
  4. 4. The composition of claim 1, wherein the closed cell array is an ordered array.
  5. 5. The composition of claim 1, wherein the closed cell array is a disordered array.
  6. 6. The composition of any one of claims 1 to 5, wherein the void volume has an average diameter of about 50 nm to about 500 nm.
  7. 7. The composition of any one of claims 1 to 6, wherein the void volume has an average diameter of about 120 nm to about 240 nm.
  8. 8. The composition of any one of claims 1 to 6, wherein the void volume has an average diameter of about 160 nm to about 300 nm.
  9. 9. The composition of any one of claims 1 to 6, wherein the void volume has an average diameter of about 140 nm to about 260 a nm.
  10. 10. The composition of any one of claims 1 to 9, wherein the metal oxide matrix comprises a metal oxide selected from the group consisting of silica, titania, alumina, zirconia, ceria, iron oxide, zinc oxide, indium oxide, tin oxide, chromium oxide, and combinations thereof.
  11. 11. The composition of any one of claims 1 to 9, wherein the metal oxide matrix comprises silica.
  12. 12. The composition of any one of claims 1 to 11 wherein the closed cell metal oxide particles are derived at least in part from polymer particles having an average diameter of from about 50nm to about 500 nm.
  13. 13. The composition of claim 12 wherein the closed cell metal oxide particles are at least partially derived from metal oxide particles having an average diameter of from about 1 nm to about 120 nm.
  14. 14. The composition of any one of claims 1 to 13, comprising a light absorber present at 0.1 wt% to about 40.0 wt%.
  15. 15. The composition of claim 14, wherein the light absorber comprises carbon black.
  16. 16. A plastic composition comprising: Plastic substrate, and Closed-cell metal oxide particles dispersed in the plastic substrate, each closed-cell metal oxide particle comprising a metal oxide matrix defining an array of closed cells, each closed-cell encapsulating medium having a non-accessible void volume, Wherein the outer surface of the closed cell metal oxide particles is defined by the closed cell array, and wherein the closed cell metal oxide particles have an average diameter of about 0.5 μm to about 100 μm.
  17. 17. The plastic composition of claim 16, wherein the closed cell array is an ordered array.
  18. 18. The plastic composition of claim 16, wherein the closed cell array is a disordered array.
  19. 19. The plastic composition of any of claims 16-18, wherein the void volume has an average diameter of about 160 nm to about 300 nm.
  20. 20. The plastic composition of any of claims 16-19, wherein the metal oxide matrix comprises a metal oxide selected from the group consisting of silica, titania, alumina, zirconia, ceria, iron oxide, zinc oxide, indium oxide, tin oxide, chromium oxide, and combinations thereof.

Description

Closed cell metal oxide particles The application is a divisional application of the application patent application with the application number 202180061333.3, the application date of the original application is 2021, 7 and 21, and the application is named as closed cell metal oxide particles. Cross Reference to Related Applications The present application claims priority from U.S. provisional application No. 63/055,011, filed on 7/22 2020, the disclosure of which is incorporated herein by reference in its entirety. Technical Field The present application relates to metal oxide particles having properties such as structural colorants and methods of making the same. Background Traditional pigments and dyes rely on chemical structure to develop color by light absorption and reflection. Structural colorants rely on physical structure rather than chemical structure to develop color by the effect of light interference. Structural colorants are found in nature, for example in bird feathers, butterfly wings and certain precious stones. Structural colorants are materials that contain microstructured or nanostructured surfaces that are small enough to interfere with visible light and produce color. For example, such materials typically contain a nanoscale pore structure that contributes to their optical characteristics. However, dielectric penetration within the exposed holes can affect these optical characteristics by changing the net refractive index or by changing the average refractive index within the holes. Disclosure of Invention The following summary presents a simplified summary of various aspects of the disclosure in order to provide a basic understanding of such aspects. This summary is not an extensive overview of the disclosure. The summary is not intended to identify key or critical elements of the disclosure nor delineate any scope of the specific 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. In one aspect of the present disclosure, a method of preparing closed cell metal oxide particles includes generating droplets from a particle dispersion including first particles including a polymeric material and second particles including a metal oxide material, drying the droplets to provide dried particles including an array of the first particles, and calcining or sintering the dried particles. In at least one embodiment, each of the first particles is coated with a layer of second particles. In at least one embodiment, calcining or sintering densifies the metal oxide material and removes the polymeric material to produce closed cell metal oxide particles, each closed cell metal oxide particle comprising a metal oxide matrix defining an array of closed cells, each closed cell encapsulation medium not having an accessible void volume. In at least one embodiment, the outer surfaces of the closed cell metal oxide particles are defined by their respective closed cell arrays. In at least one embodiment, the closed cell array is an ordered array. In at least one embodiment, the closed cell array is a disordered array. In at least one embodiment, the first particles comprise a net positively charged surface, and wherein the second particles comprise a net negatively charged surface. In at least one embodiment, the first particles comprise a net negatively charged surface, and wherein the second particles comprise a net positively charged surface. In at least one embodiment, the surface charge drives the formation of the second particle layer on the first particles. In at least one embodiment, the polymeric material comprises a polymer selected from the group consisting of poly (meth) acrylic acid, poly (meth) acrylate, polystyrene, polyacrylamide, polyethylene, polypropylene, polylactic acid, polyacrylonitrile, a copolymer of methyl methacrylate and [2- (methacryloyloxy) ethyl ] trimethylammonium chloride, derivatives thereof, salts thereof, copolymers thereof, or mixtures thereof. In at least one embodiment, the first particles have an average diameter of about 50 nm to about 500 a nm. In at least one embodiment, the metal oxide material comprises a metal oxide selected from the group consisting of silica, titania, alumina, zirconia, ceria, iron oxide, zinc oxide, indium oxide, tin oxide, chromium oxide, and combinations thereof. In at least one embodiment, the metal oxide material comprises silicon dioxide. In at least one embodiment, the second particles have an average diameter of about 1 nm to about 120: 120 nm. In at least one embodiment, the closed cell metal oxide particles have an average diameter of from about 0.5 μm to about 100 μm. In at least one embodiment, the generation of droplets is performed using a microfluidic method. In at least one embodiment, the generation and drying of droplets is performed using a spray drying process. In at