US3924032A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Surface modification of silica particles
Assignee: Corning Glass Works
•
Filing: 1974-01-28
•
Granted: 1975-12-02
•
Expires: 1994-01-28
Abstract
Abstract The surface of silica materials can be usefully modified by reacting the particles at an elevated temperature with carbon tetrachloride to form a very reactive chlorinated surface which can then be reacted with hydroxyl-containing organic compounds to form a stable organic surface on the particles.
Inventors
- 👤 William Hertl
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 13:15
CPC Classifications
B; B82; B82Y; B82Y30/00; C; C09; C09C; C09C1/00; C09C1/28; C09C1/30; C09C1/309; C09C3/00; C09C3/06; C09C3/08; C01; C01P; C01P2002/00; C01P2002/80; C01P2002/82; C01P2004/00; C01P2004/60; C01P2004/64; C01P2006/00; C01P2006/12
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
100 words
A METHOD OF MODIFYING THE SURFACE OF A HIGH SURFACE AREA SILICA MATERIAL HAVING AVAILABLE SURFACE SILANOL GROUPS WHICH COMPRISES THE STEPS OF REACTING THE MATERIAL AT AN ELEVATED TEMPERATURE IN AN ESSENTIALLY INERT ATMOSPHERE WITH CARBON TETRACHLORIDE VAPORS TO FORM SURFACE CHLORIDE GROUPS AND THEN REACTING THE CHLORINATED SURFACE OF THE MATERIAL WITH VAPORS OF A LOW MOLECULAR WEIGHT ALCOHOL, THE CHLORINATION STEP AND THE SUBSEQUENT REACTION WITH THE ALCOHOL VAPORS BEING CARRIED OUT IN A SEALED FURNACE CAPABLE OF RECEIVING VAPORS OF THE CARBON TETRACHLORIDE AND ALCOHOL UNDER REDUCED PRESSURE AND WITHOUT THE INTRODUCTION OF AIR OR MOISTURE.
Claim 2
Independent Claim
100 words
A METHOD OF MODIFYING THE SURFACE OF A HIGH SURFACE AREA SILICA MATERIAL HAVING AVAILABLE SURFACE SILANOL GROUPS WHICH COMPRISES THE STEPS OF REACTING THE MATERIAL AT AN ELEVATED TEMPERATURE IN AN ESSENTIALLY INERT ATMOSPHERE WITH CARBON TETRACHLORIDE VAPORS TO FORM SURFACE CHLORIDE GROUPS AND THEN REACTING THE CHLORINATED SURFACE OF THE MATERIAL WITH VAPORS OF A LOW MOLECULAR WEIGHT ALCOHOL, THE CHLORINATION STEP AND THE SUBSEQUENT REACTION WITH THE ALCOHOL VAPORS BEING CARRIED OUT IN A SEALED FURNACE CAPABLE OF RECEIVING VAPORS OF THE CARBON TETRACHLORIDE AND ALCOHOL UNDER REDUCED PRESSURE AND WITHOUT THE INTRODUCTION OF AIR OR MOISTURE.
Claim 3
Dependent Claim
27 words
The method of claim 1 wherein the elevated temperature is between about 375*C. and 425*C. at a reduced pressure between about 70 to about 10 6 TORR.
Claim 4
Dependent Claim
26 words
The method of claim 2 wherein the low molecular weight alcohol is selected from the group consisting of methanol, ethanol, propanol, isopropanol, butanol, and n-amyl alcohol.
Claim 5
Dependent Claim
22 words
The method of claim 3 wherein the silica material consists of silica particles having a surface area greater than about 25 m2/g.
Claim 6
Dependent Claim
10 words
The method of claim 4 wherein the alcohol is isopropanol.
Claim 7
Dependent Claim
10 words
The method of claim 4 wherein the alcohol is methanol.
Claim 8
Dependent Claim
11 words
The method of claim 4 wherein the alcohol is n-amyl alcohol.
References Cited (Backward Citations)
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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) | 1978-12-01 | 1979-06-02 | 1979-12-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-12-01 | 1983-06-02 | 1983-12-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-12-01 | 1987-06-02 | 1987-12-02 | $7700.00 | Window Closed / Lapsed |