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US 5,667,725 AGranted
Sol and fine powder of sodium magnesium fluoride and processes for their production
AssigneeNissan Chemical Industries, Ltd.
InventorsYoshitane Watanabe, Keitaro Suzuki, Yoshinari Koyama, Motoko Iijima
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Abstract
A sol comprising colloidal particles of sodium magnesium fluoride (NaF.MgF.sub.2) having an average particle diameter of from 10 to 100 nm.
Claims16
A sol comprising colloidal particles, produced by a process comprising the following steps (a), (b) and (c):
- (a) a step of mixing an aqueous sodium fluoride solution and an aqueous magnesium salt solution in a Na/Mg molar ratio of 3.0 to form a slurry of aggregates of colloidal particles of sodium magnesium fluoride,
- (b) a step of removing by-product salts contained in the slurry of aggregates of colloidal particles of sodium magnesium fluoride obtained in the step (a), and
- (c) a step of wet-pulverizing the slurry of aggregates of colloidal particles of sodium magnesium fluoride obtained in the step (b),
- wherein the colloidal particles obtained in step (c) have an average particle size of from 10 to 100 nm.
1 more element
A sol comprising colloidal particles, produced by a process comprising the steps (a), (b) and (f):
- (a) a step of mixing an aqueous sodium fluoride solution and an aqueous magnesium salt solution in a Na/Mg molar ratio of 3.0 to form a slurry of aggregates of colloidal particles of sodium magnesium fluoride,
- (b) a step of removing by-product salts contained in the slurry of aggregates of colloidal particles of sodium magnesium fluoride obtained in the step (a), and
- (f) a step of drying the slurry of aggregates of colloidal particles of sodium magnesium fluoride obtained in the step (b), dispersing the dried product in an organic solvent, followed by wet-pulverization,
- wherein the colloidal particles obtained in step (f) have an average particle size of from 10 t0 100 nm.
1 more element
A powder comprising colloidal particles, produced by a process comprising the steps (a), (b), (c) and (d):
- (a) a step of mixing an aqueous sodium fluoride solution and an aqueous magnesium salt solution in a Na/Mg molar ratio of 3.0 to form a slurry of aggregates of colloidal particles of sodium magnesium fluoride,
- (b) a step of removing by-product salts contained in the slurry of aggregates of colloidal particles of sodium magnesium fluoride obtained in the step (a),
- (c) a step of wet-pulverizing the slurry of aggregates of colloidal particles of sodium magnesium fluoride obtained in the step (b), and
- (d) a step of drying the aqueous sol of sodium magnesium fluoride obtained in the step (c),
- wherein the colloidal particles obtained in step (d) have an average particle size of from 10 to 100 nm.
2 more elements
Dependencies are inferred from the claim text.