Patent US4644077A successfully refreshed from Google Patents.
US4644077A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for producing organophilic silica
Assignee: Sherwin Williams Co
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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
2026-11-05 04:07
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.
References Cited (Backward Citations)
US2408654A
Cited
US2680696A
Cited
US2657149A
Cited
US4164509A
Cited
US4041120A
Cited
US3751326A
Cited
US3986997A
Cited
US4027073A
Cited
US4073967A
Cited
US4225631A
Cited
US4199421A
Cited
US4177315A
Cited
US4159206A
Cited
US4227979A
Cited
US4125703A
Cited
US4216024A
Cited
US4135007A
Cited
US4188451A
Cited
US4191804A
Cited
US4198465A
Cited
US4277287A
Cited
US4299746A
Cited
US4275118A
Cited
US4262072A
Cited
US4319811A
Cited
US4348462A
Cited
WO1982002403A1
Cited
US4474704A
Cited
US4390373A
Cited
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 |