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AssigneeKabushiki Kaisha Toyoda Jidoshokki Seisakusho
InventorsToshiki Inoue, Yoshifumi Kato, Hisashi Shiraki, Takanori Murasaki
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A coloring layer composition for a chromatic device of the present invention contains an oxide such as tungsten oxide or niobium oxide and so on as a solute, water and an organic solvent such as propanol. In the step of forming a reduction coloring layer, a film is formed by using a peroxotungstic acid solution containing 100 parts by weight of WO.sub.3.aNb.sub.2 O.sub.5.bH.sub.2 O.sub.2 .andgate.cH.sub.2 O (wherein a, b and c are each a positive number) as a solute, 20 to 120 parts by weight of water and 80 to 800 parts by weight of n-propanol as an organic solvent. At this time, a dip coating method is used, and the vertical pulling-up speed is less than 15 cm/min. The present invention can effectively prevent unevenness and separation of the reduction coloring layer.
A coloring layer composition for a chromatic device comprising an oxide and peroxide of at least one of W, Nb, Mo and V as a solute dissolved in water and an organic solvent selected from the group consisting of an alkoxy alkanol and a dialkyl amide compatible with water, said solvent being vaporable by heat treatment and capable of inhibiting the decomposition of hydrogen peroxide and retarding the release of dissolved oxygen from the composition, and said composition being in the form of a solution.
Dependencies are inferred from the claim text.