Near-infrared reflective film, method for producing same, and near-infrared reflector provided with near-infrared reflective film
First Claim
1. A near-infrared reflective film comprising a lamination unit comprising:
- a high refractive layer containing a first metal oxide particle and a first water-soluble polymer,a low refractive layer containing a second metal oxide particle and a second water-soluble polymer, anda mixed layer located between the high refractive layer and the low refractive layer and which contains the first metal oxide particle, the second metal oxide particle and a third water-soluble polymer, whereinthe low refractive layer has a refractive index that is smaller than a refractive index of the high refractive layer by 0.1 or more,the first metal oxide particle and the second metal oxide particle have different metal oxides,wherein, in the mixed layer, a ratio of the first metal oxide particle and the second metal oxide particle varies in steps or continuously varies,wherein each of the first metal oxide particle and the second metal oxide particle has a particle size of 4 nm to 100 nm, andwherein the mixed layer has a thickness that is 10 to 30% of a film thickness of a region of one of a high refractive layer or a low refractive layer, the one of a high refractive layer or a low refractive layer being adjacent to the mixed layer, the one of a high refractive layer or a low refractive layer having a maximum content of the metal oxide particle, and the region being defined as containing 75% or more of the maximum content of the metal oxide particle in the one of a high refractive layer or a low refractive layer.
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Abstract
The near-infrared reflective film is a lamination unit including: a high refractive layer containing a first metal oxide particle and a first water-soluble polymer, a low refractive layer containing a second metal oxide particle and a second water-soluble polymer, and a mixed layer that is located between the high refractive layer and the low refractive layer and contains the first metal oxide particle, the second metal oxide particle, and a third water-soluble polymer. The refractive index of the low refractive layer is smaller than the refractive index of the high refractive layer by 0.1 or more. The first metal oxide particle and the second metal oxide particle are different metal oxides.
14 Citations
7 Claims
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1. A near-infrared reflective film comprising a lamination unit comprising:
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a high refractive layer containing a first metal oxide particle and a first water-soluble polymer, a low refractive layer containing a second metal oxide particle and a second water-soluble polymer, and a mixed layer located between the high refractive layer and the low refractive layer and which contains the first metal oxide particle, the second metal oxide particle and a third water-soluble polymer, wherein the low refractive layer has a refractive index that is smaller than a refractive index of the high refractive layer by 0.1 or more, the first metal oxide particle and the second metal oxide particle have different metal oxides, wherein, in the mixed layer, a ratio of the first metal oxide particle and the second metal oxide particle varies in steps or continuously varies, wherein each of the first metal oxide particle and the second metal oxide particle has a particle size of 4 nm to 100 nm, and wherein the mixed layer has a thickness that is 10 to 30% of a film thickness of a region of one of a high refractive layer or a low refractive layer, the one of a high refractive layer or a low refractive layer being adjacent to the mixed layer, the one of a high refractive layer or a low refractive layer having a maximum content of the metal oxide particle, and the region being defined as containing 75% or more of the maximum content of the metal oxide particle in the one of a high refractive layer or a low refractive layer. - View Dependent Claims (2, 3, 4, 5)
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6. A method of producing a near-infrared reflective film comprising forming two layers having different refractive indices and having different metal oxide particles, and a mixed layer located between the two layers having different refractive indices and in which a ratio of the different metal oxide particles continuously varies by simultaneous multiple layer coating of a first coating liquid containing a first water-soluble polymer and a first metal oxide particle and a second coating liquid containing a second water-soluble polymer and a second metal oxide particle,
wherein each of the first metal oxide particle and the second metal oxide particle has a particle size of 4 nm to 100 nm, and wherein the mixed layer has a thickness that is 10 to 30% of a film thickness of a region of one of the two layers, the one of the two layers being adjacent to the mixed layer, the one of the two layers having a maximum content of the metal oxide particle, and the region being defined as containing 75% or more of the maximum content of the metal oxide particle in the one of the two layers.
Specification