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AssigneeNissan Chemical Industries, Ltd.
InventorsYoshitane Watanabe, Keitaro Suzuki
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An aqueous sol of colloidal particles of tungstic oxide (WO.sub.3)-stannic oxide (SnO.sub.2) composite having a particle size of from 2 to 7 millimicrons is prepared by blending an aqueous solution of tungstic acid and an aqueous solution of a stannate in a weight ratio of from 0.5 to 100 as WO.sub.3 /SnO.sub.2. Where the WO.sub.3 --SnO.sub.2 composite sol in an amount of from 2 to 100 parts by weight as the total of WO.sub.3 and SnO.sub.2 is blended with a sol of a 3- to 5 valent metal oxide having a particle size of from 4 to 50 millimicrons in an amount of 100 parts by weight as the metal oxide, a modified metal oxide sol collidal particles having a size of 4.5 to 60 millimicrons as surface-coated with the tungstic oxide (WO.sub.3)-stannic oxide (SnO.sub.5) composite colloidal particles is prepared.
A stable metal oxide sol in which the colloidal particle of the metal oxide has a particle size of from 4.5 to 60 millimicrons, said colloidal particle of the metal oxide being composed of a core of an oxide of 3, 4 or 5 valent metal having a particle size of 4 to 50 millimicrons and a coating of a composite of tungstic oxide (WO.sub.3) and stannic oxide (SnO.sub.2) having a weight ratio of from 0.5 to 100 as WO.sub.3 /SnO.sub.2 bonded onto the surface of said core, and said sol having a content of from 2 to 50% by weight as a total of said oxide of 3, 4 or 5 valent metal and said composite in a weight ratio of 100 parts by weight of said oxide of 3, 4, or 5 valent metal to 2 to 100 parts by weight of said composite.
A stable metal oxide aqueous sol having a pH value of 1 to 9 in which the colloidal particle of the metal oxide has a particle size of from 4.5 to 60 millimicrons, said colloidal particle of the metal oxide being composed of a core of TiO.sub.2, ZrO.sub.2 or SnO.sub.2 having a particle size of 4 to 50 millimicrons and a coating of a composite of tungstic oxide (WO.sub.3) and stannic oxide (SnO.sub.2) having a weight ratio of from 0.5 to 100 as WO.sub.3 /SnO.sub.2 bonded onto the surface of said core, and said sol having a content of from 2 to 50% by weight as a total of said TiO.sub.2, ZrO.sub.2 or SnO.sub.2 and said composite in a weight ratio of 100 parts by weight of said TiO.sub.2, ZrO.sub.2 or SnO.sub.2 to 2 to 100 parts by weight of said composite.
A stable tungstic oxide (WO.sub.3)-stannic oxide (SnO.sub.2) composite sol in which colloidal particles composed of tungstic oxide (WO.sub.3)-stannic oxide (SnO.sub.2) composite and having a particle size of from 2 to 7 millimicrons and a weight ratio of WO.sub.3 /SnO.sub.2 of being from 0.5 to 100 have been stabilized with an alkali metal ion, ammonium ion or soluble amine in a ratio of from 0.01 to 0.7 mol to mol of the total of said composite of tungstic oxide (WO.sub.3) and stannic oxide (SnO.sub.2) in a liquid medium, the total content of said tungstic oxide (WO.sub.3) and stannic oxide (SnO.sub.2) in the sol being from 0.5 to 40% by weight.
A method of preparing a stable tungstic oxide (WO.sub.3) and stannic oxide (SnO.sub.2) composite aqueous sol, having a weight ratio of 0.5 to 100 as WO.sub.3 /SnO.sub.2, comprising contacting an aqueous solution of a water-soluble tungstate having a concentration of from 0.1 to 15% by weight as WO.sub.3 with a cationic exchanger in hydrogen form whereby to obtain an aqueous solution of tungstic oxide having a concentration of from 0.1 to 15% by weight as WO.sub.3, and blending said aqueous solution with an aqueous solution of a water-soluble stannate having a concentration of from 0.1 to 30% by weight as SnO.sub.2 in a weight ratio of from 0.5 to 100 as WO.sub.3 /SnO.sub.2 based on the respective aqueous solutions at a temperature of 0.degree. to 100.degree. c.
Dependencies are inferred from the claim text.