US4865829A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for preparing silica gel particles
Assignee: Mitsubishi Chemical Corp
•
Filing: 1988-09-09
•
Granted: 1989-09-12
•
Expires: 2008-09-09
Abstract
Abstract A method for preparing silica gel particles, which comprises suspending a mixed solution of a silicic acid ester and water in an organic liquid immiscible with the mixed solution, followed by gelation wherein said organic liquid contains an ethyl cellulose having an ethoxy group content of at least 47% by weight and being soluble in the organic liquid.
Inventors
- 👤 Eiji Hattori
- 👤 Toru Tagawa
- 👤 Yasuo Oguri
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 22:40
CPC Classifications
C; C01; C01B; C01B33/00; C01B33/113; C01B33/12; C01B33/16; C01B33/163; C01B33/14; C01B33/152; C03; C03B; C03B19/00; C03B19/10; C03B19/1005; C03B19/106; C03B19/1065; C03B19/12
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
88 words
A method of for preparing spherical, unagglomerated silica gel particles, which comprises: suspending a mixed solution of a silicic acid ester and water in an organic liquid immiscible with the mixed solution, and gelling the resultant suspension while stirring, wherein said organic liquid contains an ethyl cellulose soluble therein having an ethoxy group content of at least 47% by weight said ethyl cellulose being present in an amount of from 0.05 to 10% by weight, based on the total amount of the organic liquid and the ethyl cellulose.
Claim 2
Independent Claim
88 words
A method of for preparing spherical, unagglomerated silica gel particles, which comprises: suspending a mixed solution of a silicic acid ester and water in an organic liquid immiscible with the mixed solution, and gelling the resultant suspension while stirring, wherein said organic liquid contains an ethyl cellulose soluble therein having an ethoxy group content of at least 47% by weight said ethyl cellulose being present in an amount of from 0.05 to 10% by weight, based on the total amount of the organic liquid and the ethyl cellulose.
Claim 3
Dependent Claim
19 words
The method according to claim 1, wherein said silicic acid ester is an alkoxy silane or an alkoxyalkyl silane.
Claim 4
Dependent Claim
35 words
The method according to claim 1, wherein said silicic acid ester is selected from the group consisting of tetramethoxy silane, tetraethoxy silane, tetrapropoxy silane, tetrabutoxy silane, trimethoxymethyl silane, dimethoxydimethyl silane, triethoxyethyl silane and diethoxydiethyl silane.
Claim 5
Dependent Claim
22 words
The method according to claim 1, wherein said ethyl cellulose has an ethoxy group content of from 47 to 50% by weight.
Claim 6
Dependent Claim
27 words
The method according to claim 1, wherein the organic liquid is a C 5 -C 10 alicyclic compound or an alkyl-substituted C 5 -C 10 alicyclic compound.
Claim 7
Dependent Claim
24 words
The method according to claim 1, wherein the organic liquid is selected from the group consisting of cyclopentane, cyclohexane, cycloheptane, methylcyclohexane, cyclooctane and decalin.
Claim 8
Dependent Claim
25 words
The method according to claim 1, wherein the mixed solution contains from 2 to 20 equivalent of water per equivalent of the silicic acid ester.
Claim 9
Independent Claim
102 words
A method for preparing a silica particles, which comprises: suspending a mixed solution of a silicic acid ester and water in an organic liquid immiscible with the mixed solution and gelling the resultant suspension while stirring thereby forming spherical, unagglomerated gel particles, and then sintering the silica gel particles to obtain the silica particles, wherein said organic liquid contains an ethyl cellulose soluble therein having an ethoxy group content of at least 47% by weight said ethyl cellulose being present in an amount from 0.05 to 10% by weight, based on the total amount of the organic liquid and the ethyl cellulose.
Claim 10
Independent Claim
102 words
A method for preparing a silica particles, which comprises: suspending a mixed solution of a silicic acid ester and water in an organic liquid immiscible with the mixed solution and gelling the resultant suspension while stirring thereby forming spherical, unagglomerated gel particles, and then sintering the silica gel particles to obtain the silica particles, wherein said organic liquid contains an ethyl cellulose soluble therein having an ethoxy group content of at least 47% by weight said ethyl cellulose being present in an amount from 0.05 to 10% by weight, based on the total amount of the organic liquid and the ethyl cellulose.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1992-09-11 | 1993-03-13 | 1993-09-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-09-11 | 1997-03-13 | 1997-09-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-09-11 | 2001-03-13 | 2001-09-12 | $7700.00 | Window Closed / Lapsed |