Light control sheet, method for producing light control sheet, and liquid crystal composition for polymer dispersion
AssigneeToppan Inc.
InventorTaisuke Enya
Life of this patent
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Abstract
A light control sheet includes an organic polymer layer that partitions voids, and a liquid crystal composition that contains a non-polymerizable liquid crystal compound and fills the voids. The light control sheet changes the transmittance to visible light by driving the non-polymerizable liquid crystal compound. The liquid crystal composition contains adipate as a non-polymerizable viscosity-reducing agent, and the weight of the non-polymerizable viscosity-reducing agent relative to the weight of the non-polymerizable liquid crystal compound is 1% or more.
Claims12
A light control sheet, comprising:
- an organic polymer layer partitioning a plurality of voids;
- and
- a liquid crystal composition comprising a non-polymerizable liquid crystal compound and filling the voids,
- wherein the light control sheet is configured to change transmittance to visible light by driving the non-polymerizable liquid crystal compound, the liquid crystal composition includes a non-polymerizable viscosity-reducing agent which is at least one compound selected from the group consisting of diisodecyl adipate, dibutyl adipate, dioctyl adipate, bis(2-butoxyethyl) adipate, and diisononyl adipate, and
- the non-polymerizable liquid crystal compound has an NI point a nematic-isotropic transition temperature in a range of 100° C. to 145° C.
A method for producing a light control sheet, comprising:
- phase-separating liquid crystal particles comprising a liquid crystal composition including a non-polymerizable liquid crystal compound from an organic polymer layer by polymerizing a UV-curable compound in a layer including the liquid crystal composition and the UV-curable compound such that the organic polymer layer partitions a plurality of voids and the liquid crystal composition fills the voids,
- wherein the liquid crystal composition includes a non-polymerizable viscosity-reducing agent which is at least one compound selected from the group consisting of diisodecyl adipate, dibutyl adipate, dioctyl adipate, bis(2-butoxyethyl) adipate, and diisononyl adipate,
- a ratio of a weight of the organic polymer layer to a total weight of the organic polymer layer and the liquid crystal composition is in a range of 30 mass % to 60 mass % or less,
- a ratio of a weight of the non-polymerizable viscosity-reducing agent to a weight of the non-polymerizable liquid crystal compound is in a range of 1% to 8%,
- the light control sheet is configured to change transmittance to visible light by driving the non-polymerizable liquid crystal compound, and
- the non-polymerizable liquid crystal compound has a nematic-isotropic transition temperature in a range of 100° C. to 145° C.
A liquid crystal composition for polymer dispersion, comprising:
- a UV-curable compound;
- a non-polymerizable liquid crystal compound;
- and
- a non-polymerizable viscosity-reducing agent which is at least one compound selected from the group consisting of diisodecyl adipate, dibutyl adipate, dioctyl adipate, bis(2-butoxyethyl) adipate, and diisononyl adipate,
- wherein a ratio of a weight of the UV-curable compound to a total weight of the UV-curable compound and the liquid crystal composition is in a range of 30 mass % to 60 mass %,
- a ratio of a weight of the non-polymerizable viscosity-reducing agent to a weight of the non-polymerizable liquid crystal compound is in a range of 1% to 8%,
- the liquid crystal composition is phase-separated from an organic polymer layer by polymerizing the UV-curable compound in a layer including the liquid crystal composition and the UV-curable compound, and
- the non-polymerizable liquid crystal compound has a nematic-isotropic transition temperature in a range of 100° C. to 145° C.
Dependencies are inferred from the claim text.