EP0280673A2
Expired / Lapsed
EP
⏱️ 0.0 years remaining
Method for production of inorganic minute globular particles
Assignee: Nippon Shokubai Co Ltd
•
Filing: 1988-02-24
•
Granted: —
•
Expires: 2008-02-24
Abstract
Abstract A method for the production of inorganic minute globular particles, which comprises forming a W/O type sol emulsion by mixing at least one metal oxide-containing sol selected from the group consisting of (a) metal oxide sols and (b) mixed sols containing said metal oxide sols and an inorganic compound, an alkoxide, or a sol of at least one other element with an organic solvent insoluble or sparingly soluble in water in the presence of a surfactant; mixing said emulsion with a basic substance or an electrolyte thereby converting the sol forming the water layer in said emulsion into gel thereby obtaining globular gel particles; and subsequently heating the globular gel particles thereby expelling from the system the water in the globular gel particles in the form of a mixture thereof with the organic solvent.
Inventors
- 👤 Shigemi Osaka
- 👤 Kazuo Hata
- 👤 Tsukasa Takahishi
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-10-27 23:34
CPC Classifications
C; C01; C01B; C01B13/00; C01B13/14; C01B13/18; C01B13/185; C01B13/32; C01B13/328; C01F; C01F7/00; C01F7/02; C01F7/34; C01F7/36; C01G; C01G25/00; C01G25/02; C01P; C01P2004/00; C01P2004/30; C01P2004/32; C01P2004/60; C01P2004/62; Y; Y10; Y10S; Y10S516/00; Y10S516/902
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
134 words
A method for the production of inorganic minute globular particles, which comprises forming a W/O type sol emulsion by mixing at least one metal oxide-containing sol selected from the group consisting of (a) metal oxide sols and (b) mixed sols containing said metal oxide sols and an inorganic compound, an alkoxide, or a sol of at least one other element with an organic solvent insoluble or sparingly soluble in water in the presence of a surfactant; mixing said emulsion with a basic substance or an electrolyte thereby converting said sol forming the water layer in said emulsion into gel thereby obtaining globular gel particles; and subsequently heating said globular gel particles thereby expelling from the system the water in said globular gel particles in the form of a mixture thereof with said organic solvent.
Claim 2
Independent Claim
134 words
A method for the production of inorganic minute globular particles, which comprises forming a W/O type sol emulsion by mixing at least one metal oxide-containing sol selected from the group consisting of (a) metal oxide sols and (b) mixed sols containing said metal oxide sols and an inorganic compound, an alkoxide, or a sol of at least one other element with an organic solvent insoluble or sparingly soluble in water in the presence of a surfactant; mixing said emulsion with a basic substance or an electrolyte thereby converting said sol forming the water layer in said emulsion into gel thereby obtaining globular gel particles; and subsequently heating said globular gel particles thereby expelling from the system the water in said globular gel particles in the form of a mixture thereof with said organic solvent.
Claim 3
Dependent Claim
51 words
A method according to Claim 1, characterized in that said formation of said W/O type sol emulsion is carried out in the presence of a water-soluble organic substance in an amount in the range of 0.05 to 30% by weight, based on the amount of solids in the metal oxide-containing sol.
Claim 4
Independent Claim
54 words
A method according to any of the preceeding claims, characterized in that it comprises using a metal oxide-containing sol to be produced by preparing a metal oxide-containing sol from an aqueous inorganic metal salt solution by hydrolysis of urea therein and subsequently defecating said metal oxide-containing sol by the use of a filtering membrane.
Claim 5
Independent Claim
32 words
A method according to any of the preceeding claims, characterized in that said metal is at least one member selected from the group consisting of zirconium, aluminum, titanium, yttrium, tin, and silicon.
Claim 6
Dependent Claim
26 words
A method according to Claim 4, characterized in that said metal is at least one member selected from the group consisting of zirconium, aluminum and yttrium.
Claim 7
Independent Claim
60 words
A method according to any of the preceeding claims, characterized in that said organic solvent insoluble or sparingly soluble in water is used in an amount in the range of 5 to 80% by weight and said surfactant in an amount in the range of 0.1 to 30% by weight, based on the amount of said W/O type sol emulsion.
Claim 8
Independent Claim
18 words
A method according to any of the preceeding claims, characterized in that said surfactant is a nonionic surfactant.
Claim 9
Dependent Claim
23 words
A method according to Claim 7, characterized in that said nonionic surfactant is of the polyalkylene glycol type or the polyhydric alcohol type.
Claim 10
Independent Claim
30 words
A method according to any of the preceeding claims, characterized in that an amino acid or a salt thereof or a polyhydric alcohol is used in combination with said surfactant.
Claim 11
Independent Claim
33 words
A method according to any of the preceeding claims, characterized in that said basic substance is ammonia gas and said electrolyte is a solution of an organic metal salt in an organic solvent.
Claim 12
Independent Claim
44 words
A method according to any of the preceeding claims, characterized in that said basic substance or said electro is used in an amount in the range of 0.01 to 50% by weight, based on the amount of solids of said W/O type sol emulsion.
Claim 13
Independent Claim
32 words
A method according to any of the preceeding claims, characterized in that the heating of said globular gel particles is carried out at a temperature in the range of 10° to 120°C.
Claim 14
Independent Claim
30 words
A method according to any of the preceeding claims, characterized in that it further comprises defecating the solution containing said globular gel particles by the use of a filtering membrane.
Claim 15
Dependent Claim
16 words
A method according to Claim 13, characterized in that said filtering membrane is an ultrafilter membrane.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
Maintenance schedule is calculated for granted US utility patents.