Process for preparing a photochromic compound and a cosmetic composition thereof
AssigneeL'oreal
InventorChristophe Remy
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Abstract
A process for preparing a photochromic compound and/or improving the photochromic properties of a photochromic compound selected from metal oxides, hydrated metal oxides and metal oxide/hydrate complexes by heat-treating the photochromic compound in the presence of at least one metallic component such as an oxide or hydroxide of lithium, sodium and/or potassium, the photochromic compound obtained using this process, and the cosmetic composition comprising it.
Claims40
A process for preparing a photochromic compound having a parameter Δ(ΔE) of at least 7, comprising
- heat-treating at least one photochromic compound selected from metal oxides, hydrated metal oxides and metal oxide/hydrate complexes at a temperature ranging from 400 to 1000° C. in the presence of at least one metallic component selected from oxides and hydroxides of lithium, sodium and potassium.
A process for improving the parameter Δ(ΔE) of at least one photochromic compound selected from metal oxides, hydrated metal oxides and metal oxide/hydrate complexes, said process comprising
- heat-treating, for the purpose of improving said parameter Δ(ΔE), said at least one photochromic compound at a temperature ranging from 400 to 1000° C. in the presence of at least one metallic component selected from oxides and hydroxides of lithium, sodium and potassium.
Dependencies are inferred from the claim text.