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US 2022/0145086 A1Published application
Methods of preparing structural colorants
AssigneesBASF Coatings GmbH, President and Fellows of Harvard College
InventorsZenon Paul CZORNIJ, Charles L. TAZZIA, Paragkumar THANKI, Elijah SHIRMAN, Theresa M. KAY, Joanna AIZENBERG
Life of this patent
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Abstract
Disclosed in certain embodiments is a method of preparing structural colorants comprising photonic particles, the method comprising varying the calcination temperature in the process to enable the tuning of pore size to obtain a wide variety of possible colors.
Claims21
1-39. (canceled)
A method of preparing structural colorants comprising photonic particles, the method comprising:
- forming a liquid dispersion of polymer particles and a metal oxide;
- optionally forming droplets of the liquid dispersion;
- drying the droplets or the dispersion to provide polymer template particles comprising polymer particles and metal oxide;
- selecting a calcining parameter to remove the polymer particles from the template particles to achieve photonic particles comprising porous metal oxide particles having a pre-determined color that is correlated with the selection of the calcining parameter;
- and
- calcining the polymer template particles according to the selected calcining parameter to achieve the structural colorants comprising photonic particles, wherein the structural colorant is selected from the group consisting of photonic spheres, photonic granules, opals, inverse opals, folded photonic structures and platelet-like photonic structures.
3 more elements
A method of preparing structural colorants, the method comprising:
- forming a liquid dispersion of polymer particles and a metal oxide;
- optionally forming droplets of the liquid dispersion;
- drying the droplets or the dispersion to provide polymer template particles comprising polymer particles and metal oxide;
- correlating two or more calcining parameters to remove the polymer particles from the template particles to provide photonic particles comprising porous metal oxide particles, to two or more different colors of the resultant particles;
- and
- calcining the polymer template particles according to one of the calcining parameters to achieve photonic particles of the correlated color to achieve the structural colorants comprising photonic particles, wherein the structural colorant is selected from the group consisting of photonic spheres, photonic granules, opals, inverse opals, folded photonic structures and platelet-like photonic structures, wherein calcining the polymer template particles is performed according to different calcining parameters to achieve photonic particles of a different color.
3 more elements
Dependencies are inferred from the claim text.