US4644077A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for producing organophilic silica
Assignee: Sherwin Williams Co
•
Filing: 1985-09-18
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Granted: 1987-02-17
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Expires: 2005-09-18
Abstract
Abstract In a silica organosol consisting of silica dispersed in a water-miscible organic solvent, a process for treating the silica with a trialkoxysilane to make the silica more organophilic while minimizing the self condensation of the trialkoxy silane, which process comprises: (a) admixing water and a catalytic amount of acid to the silica organosol; and (b) gradually adding a trialkoxysilane to the admixture under reactive conditions; and (c) removing substantially all of the water; wherein the trialkoxy silane is present at a level up to about 30% by weight based upon the weight of the silica and the water is added at an amount up to about 30% by weight based upon the weight of the water-miscible organic solvent.
Inventors
- 👤 Goutam Gupta
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 02:10
CPC Classifications
C; C09; C09C; C09C3/00; C09C3/12; C01; C01B; C01B33/00; C01B33/113; C01B33/12; C01B33/14; C01B33/146; C01B33/149; C09C1/00; C09C1/28; C09C1/30; C09C1/3081; C01P; C01P2004/00; C01P2004/60; C01P2006/00; C01P2006/22
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
116 words
In a silica organosol consisting of silica dispersed in a water-miscible organic solvent, a process for treating the silica with a trialkoxysilane to make the silica more organophilic while minimizing the self condensation of the trialkoxysilane, which process comprises: (a) admixing water and a catalytic amount of acid with the silica organosol; and (b) gradually adding a trialkoxysilane to the admixture under reactive conditions; and (c) removing substantially all of the water; wherein the trialkoxysilane is present at a level up to about 30% by weight based upon the weight of the silica and the water is added at an amount up to about 15% by weight based upon the weight of the water-miscible organic solvent.
Claim 2
Dependent Claim
116 words
In a silica organosol consisting of silica dispersed in a water-miscible organic solvent, a process for treating the silica with a trialkoxysilane to make the silica more organophilic while minimizing the self condensation of the trialkoxysilane, which process comprises: (a) admixing water and a catalytic amount of acid with the silica organosol; and (b) gradually adding a trialkoxysilane to the admixture under reactive conditions; and (c) removing substantially all of the water; wherein the trialkoxysilane is present at a level up to about 30% by weight based upon the weight of the silica and the water is added at an amount up to about 15% by weight based upon the weight of the water-miscible organic solvent.
Claim 3
Dependent Claim
15 words
The process of claim 1 further characterized in that the silica is a colloidal silica.
Claim 4
Dependent Claim
16 words
The process of claim 1 further characterized in that the water is removed by azeotropic distillation.
Claim 5
Dependent Claim
30 words
The process of claim 1 further characterized in that the trialkoxysilane is present at a level of up to about 20% by weight based upon the weight of the silica.
Claim 6
Dependent Claim
32 words
The process of claim 4 further characterized in that the trialkoxysilane is present at a level of from about 5 to about 12% by weight based upon the weight of the silica.
Claim 7
Dependent Claim
34 words
The process of claim 1 further characterized in that the water is present in an amount ranging from about 1 to about 10% by weight based upon the weight of the water-miscible organic solvent.
Claim 8
Dependent Claim
40 words
The process of claim 1 further characterized in that the trialkoxy silane is gradually added to the admixture of water, acid and silica organosol while the admixture is maintained at a temperature ranging from about 25° to about 140° C.
Claim 9
Dependent Claim
24 words
The process of claim 7 further characterized in that the admixture is maintained at a temperature ranging from about 90° to about 120° C.
Claim 10
Dependent Claim
11 words
A surface treated silica prepared by the process of claim 1.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1990-02-16 | 1990-08-18 | 1991-02-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-02-16 | 1994-08-18 | 1995-02-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-02-16 | 1998-08-18 | 1999-02-17 | $7700.00 | Window Closed / Lapsed |