Thermochromic effect pigment and process for producing the same
AssigneeMerck Patent GmbH
InventorsKarl Osterried, Magarete Herbski, Ian Charles Sage
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Abstract
A thermochromic effect pigment comprising a thermochromic liquid crystal material encapsulated with a polymer and coated with one or more inorganic metal oxides or nearly insoluble metal salts selected from Al.sub.2 O.sub.3, SnO.sub.2, ZrO.sub.2, TiO.sub.2, CaO, SiO.sub.2, ZnO, MgO or BaSO.sub.4. The pigment is stable in solvent-based formulations and can be used as a colorant in the form of an aqueous suspension or as a powder in lacquer compositions, plastic compositions, dyed filter compositions, dyed glass compositions, dyed cosmetic compositions, printing ink compositions, and in hair coloring agents.
Claims21
A thermochromic effect particulate pigment, comprising a thermochromic liquid crystal material encapsulated within a polymeric encapsulating material and on the outer surface of the encapsulating material a coating comprising one or more inorganic metal oxides or metal oxide hydrates, mixtures of inorganic metal oxides or metal oxide hydrates or BaSO.sub.4.
Dependencies are inferred from the claim text.