US3855145A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Preparation of concentrated silica organosols
Assignee: ChampionX LLC
•
Filing: 1972-10-31
•
Granted: 1974-12-17
•
Expires: 1992-10-31
Abstract
Abstract Silica organosol compositions comprising from 50 to 70 percent by weight of silica particles as SiO2, from 0 to 3 percent by weight of water, and from 30 to 50 percent of a water miscible organic alcohol are disclosed. A method for making these silica organosols is also disclosed by utilizing a double deionized silica sol preferably prepared with a 12-24 hour holding time between passes through a cation-anion exchanger.
Inventors
- 👤 P Vossos
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 07:31
CPC Classifications
C; C01; C01B; C01B33/00; C01B33/113; C01B33/12; C01B33/14; C01B33/145
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
137 words
A METHOD OF PREPARING A CONCENTRATED SILICA ORGANOSOL WHICH COMPRISES THE STEPS OF: A. PASSING A SILICA SOL CONTAINING 20-60 PERCENT COLLOIDAL PARTICLES OF AMORPHOUR SILICA THROUGH A CATION EXCHANGE RESIN IN THE HYDROGEN FORM AND A STRONG BASE ANION EXCHANGE RESIN IN THE HYDROGEN FORM TO PRODUCE A SINGLE DEIONIZED SOL ANF AFTER A HOLDING TIME OF 12-24 HOURS PASSING SAID SINGLE DEIONIZED SOL THROUGH A CATION EXCHANGE RESIN AN ANION EXCHANGE RESIN TO PRODUCE A DOUBLE DEIONIZED SILICA SOL HAVING A SIO2 CONTENT OF FROM 50 TO 70 PERCENT BY WEIGHT; B. ADDING SAID DOUBLE DEIONIZED SILICA SOL TO A REACTION VESSEL CONTAINING A WATER-MISCIBLE ORGANIC ALCOHOL; FEEDING ADDITIONAL WATER-MISCIBLE ORGANIC ALCOHOL AS A WATER ALCOHOL AZEOTROPE IS REMOVED BY VACCUM DISTILLATION AT A TEMPERATURE BELOW ABOUT 100*C; AND RECOVER ERING THE SILICA ORGANOSOL PRODUCT.
Claim 2
Independent Claim
137 words
A METHOD OF PREPARING A CONCENTRATED SILICA ORGANOSOL WHICH COMPRISES THE STEPS OF: A. PASSING A SILICA SOL CONTAINING 20-60 PERCENT COLLOIDAL PARTICLES OF AMORPHOUR SILICA THROUGH A CATION EXCHANGE RESIN IN THE HYDROGEN FORM AND A STRONG BASE ANION EXCHANGE RESIN IN THE HYDROGEN FORM TO PRODUCE A SINGLE DEIONIZED SOL ANF AFTER A HOLDING TIME OF 12-24 HOURS PASSING SAID SINGLE DEIONIZED SOL THROUGH A CATION EXCHANGE RESIN AN ANION EXCHANGE RESIN TO PRODUCE A DOUBLE DEIONIZED SILICA SOL HAVING A SIO2 CONTENT OF FROM 50 TO 70 PERCENT BY WEIGHT; B. ADDING SAID DOUBLE DEIONIZED SILICA SOL TO A REACTION VESSEL CONTAINING A WATER-MISCIBLE ORGANIC ALCOHOL; FEEDING ADDITIONAL WATER-MISCIBLE ORGANIC ALCOHOL AS A WATER ALCOHOL AZEOTROPE IS REMOVED BY VACCUM DISTILLATION AT A TEMPERATURE BELOW ABOUT 100*C; AND RECOVER ERING THE SILICA ORGANOSOL PRODUCT.
Claim 3
Dependent Claim
23 words
The method of claim 1 wherein the double deionized silica sol has a SiO2 content of from 50 to 60 percent by weight.
Claim 4
Dependent Claim
15 words
The method of claim 1 wherein the distillation temperature ranges from 50* to 100* C.
Claim 5
Dependent Claim
33 words
The method of claim 1 wherein the reaction vessel contains from 20 to 80 Percent by weight of ethylene glycol monoethyl ether based on the water present in the double deionized silica sol.
Claim 6
Dependent Claim
12 words
The method of claim 1 wherein the holding time is 18-24 hours.
References Cited (Backward Citations)
US2974105A
Cited
US3342747A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-12-16 | 1978-06-17 | 1978-12-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-12-16 | 1982-06-17 | 1982-12-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-12-16 | 1986-06-17 | 1986-12-17 | $7700.00 | Window Closed / Lapsed |