Abstract A colloidal dispersion of hydrous antimony pentoxide particles is made by a process which comprises introducing particles of antimony trioxide into a polar organic solvent selected from the group consisting of formamide, methylformamide, dimethyl formamide, acetamide, methylacetamide, dimethylacetamide, dimethyl sulfoxide, formic acid, tetramethyl urea, methanol and ethanol, and contacting said particles with aqueous hydrogen peroxide in the presence of an aliphatic alpha-hydroxy carboxylic acid and a halogen acid selected from the group consisting of hydrogen chloride, hydrogen bromide, and hydrogen iodide at a temperature of from about 0° C to about the decomposition temperature of the reaction mixture for a length of time sufficient to convert at least a portion of the antimony particles to colloidal particles of hydrous antimony pentoxide.
Inventors
👤 Charles Edward Crompton
👤 Abdulla M. Z. Kazi
Bibliographic Details
Application Number—
JurisdictionUS
Data Sourcegoogle_patents
Last Synchronized2026-11-02 11:16
CPC Classifications
C; C01; C01G; C01G30/00; C01G30/004; C01G30/005
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
117 words
A process for making a colloidal dispersion of hydrous antimony pentoxide particles comprising introducing particles of antimony trioxide into a polar organic solvent selected from the group consisting of formamide, methylformamide, dimethyl formamide, acetamide, methylacetamide, dimethylacetamide, dimethyl sulfoxide, formic acid, tetramethyl urea, methanol and ethanol and contacting said particles with aqueous hydrogen peroxide in the presence of an aliphatic alpha-hydroxy carboxylic acid, and a halogen acid selected from the group consisting of hydrogen chloride and hydrogen bromide, at a temperature of from about 0° C to about the decomposition temperature of the reaction mixture for a length of time sufficient to convert at least a portion of the antimony particles to colloidal particles of hydrous antimony pentoxide.
Claim 2
Dependent Claim
117 words
A process for making a colloidal dispersion of hydrous antimony pentoxide particles comprising introducing particles of antimony trioxide into a polar organic solvent selected from the group consisting of formamide, methylformamide, dimethyl formamide, acetamide, methylacetamide, dimethylacetamide, dimethyl sulfoxide, formic acid, tetramethyl urea, methanol and ethanol and contacting said particles with aqueous hydrogen peroxide in the presence of an aliphatic alpha-hydroxy carboxylic acid, and a halogen acid selected from the group consisting of hydrogen chloride and hydrogen bromide, at a temperature of from about 0° C to about the decomposition temperature of the reaction mixture for a length of time sufficient to convert at least a portion of the antimony particles to colloidal particles of hydrous antimony pentoxide.
Claim 3
Dependent Claim
16 words
The process of claim 1 wherein the carboxylic acid contains from 2 to 6 carbon atoms.
Claim 4
Dependent Claim
27 words
The process of claim 2 wherein the carboxylic acid is selected from the group consisting of tartaric acid, oxalic acid, citric acid, malic acid, and gluconic acid.
Claim 5
Dependent Claim
21 words
The process of claim 1 wherein the molar ratio of halogen acid to antimony is from about 0.25:1 to about 1:1.
Claim 6
Dependent Claim
21 words
The process of claim 4 wherein the molar ratio of carboxylic acid to antimony is from about 0.1:1 to about 2.0:1.
Claim 7
Dependent Claim
18 words
The process of claim 5 wherein the reaction temperature is from about 50° C to about 105° C.