US3738957A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Coacervates of polyvinyl alcohol and colloidal silica
Assignee: EIDP Inc
•
Filing: 1971-03-18
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Granted: 1973-06-12
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Expires: 1991-03-18
Abstract
Abstract COACERVATES OF POLYVINYL ALCOHOL AND COLLOIDAL SILICA HAVING THE AVERAGE PARTICLE DIAMETER OF 4-50 NANOMETERS ARE FORMED IN GOOD YIELDS WITHIN THE PH RANGE OF 1.5-4.5 AND WITH THE SILICA/POLYVINYL ALCOHOL CAN BE FORMED MOMOMOLECULAR LAYER OF POLYVINYL ALCOHOL CAN BE FORMED ON THE SILICA SURFACE. THE CONCENTRATION OF POLYVINYL ALCOHOL IS SUCH THAT THERE ARE 1-5 ALCOHOLIC HYDROXYL GROUPS PER SQUARE NANOMETER OF SILICA SURFACE. SUCH COACERVATES ARE USEFUL AS INSOLUBILIZERS AND EXTENDERS FOR POLYVINYL ACETATE EMULSIONS, AS A SOURCE OF FINE SILICA POWDERS THAT CAN BE USED AS ADSORBENTS FOR VAPORS OR AS A SOURCE OF COLLOIDAL SILICA DISPERSIBLE IN WATER-MISCIBLE ORGANIC SOLVENTS.
Inventors
- 👤 R Iler
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 15:04
CPC Classifications
D; D21; D21H; D21H19/00; D21H19/36; D21H19/44; D21H19/56; D21H19/60; B; B01; B01J; B01J13/00; B01J13/0052; B01J13/0065; B01J20/00; B01J20/02; B01J20/10; B01J20/103; B01J20/22; B01J20/26; B01J20/261; B01J20/28; B01J20/28002; B01J20/28004; B01J20/28007; B01J20/28014; B01J20/28047; B01J20/30; B01J20/32; B01J20/3202; B01J20/3204; B01J20/3231; B01J20/3242; B01J20/3268; B01J20/327; B01J21/00; B01J21/06; B01J21/08; B82; B82Y; B82Y30/00; C; C01; C01B; C01B33/00; C01B33/113; C01B33/12; C01B33/14; C01B33/155; C01B33/16; C08; C08K; C08K3/00; C08K3/34; C08K3/36; D21H19/38; D21H19/40; Y; Y10; Y10S; Y10S516/00; Y10S516/922; Y10S516/924; Y10S516/928
Claims Analysis
Total Claims: 0
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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) | 1976-06-11 | 1976-12-11 | 1977-06-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-06-11 | 1980-12-11 | 1981-06-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-06-11 | 1984-12-11 | 1985-06-12 | $7700.00 | Window Closed / Lapsed |