US3355474A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for production of hydroxyendblocked siloxane fluids
Assignee: Union Carbide Corp
•
Filing: 1963-07-01
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Granted: 1967-11-28
•
Expires: 1983-07-01
Abstract
No abstract record available.
Inventors
- 👤 Jr Marshall L Wheeler
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 06:28
CPC Classifications
C; C08; C08G; C08G77/00; C08G77/04; C08G77/06; C08G77/14; C08G77/16
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
96 words
A PROCESS FOR THE PRODUCTION OF HYDROXY-ENDBLOCKED ORGANPOLYSILOXANES WHICH CONSISTS ESSENTIALLY OF CONTACTING AN ORGANOPOLYSILOXANE CONTAINING ATLEAST ONE SILICONBONDED GROUP SELECTED FROM THE CLASS CONSISTING OF HALOGEN ATOMS AND ACYLOXY GROUPS WITH A FINELY DIVIDED SOLID PARTICULATE WATER-CONTAINING BASIC ANION EXCHANGE MATERIAL, AND WHEREIN THE AMOUNT OF ANION EXCHANGE MATERIAL PRESENT IN THE REACTION SYSTEM IS AT LEAST SUFFICIENT TO PROVIDE SUFFICIENT WATER TO HYDRLYZE ALL OF THE HALOGEN ATOMS AND ACYLOXY GROUPS OF THE SILOXANE AND ALSO TO NEUTRALIZE THE RESULTING ACIDS PRODUCED BYSUCH HYDROLYSIS, AND RECOVERING A HYDROXY-ENDBLOCKED ORGANPOLYSILOXANE PRODUCT FROM THE REACTION MIXTURE.
Claim 2
Dependent Claim
96 words
A PROCESS FOR THE PRODUCTION OF HYDROXY-ENDBLOCKED ORGANPOLYSILOXANES WHICH CONSISTS ESSENTIALLY OF CONTACTING AN ORGANOPOLYSILOXANE CONTAINING ATLEAST ONE SILICONBONDED GROUP SELECTED FROM THE CLASS CONSISTING OF HALOGEN ATOMS AND ACYLOXY GROUPS WITH A FINELY DIVIDED SOLID PARTICULATE WATER-CONTAINING BASIC ANION EXCHANGE MATERIAL, AND WHEREIN THE AMOUNT OF ANION EXCHANGE MATERIAL PRESENT IN THE REACTION SYSTEM IS AT LEAST SUFFICIENT TO PROVIDE SUFFICIENT WATER TO HYDRLYZE ALL OF THE HALOGEN ATOMS AND ACYLOXY GROUPS OF THE SILOXANE AND ALSO TO NEUTRALIZE THE RESULTING ACIDS PRODUCED BYSUCH HYDROLYSIS, AND RECOVERING A HYDROXY-ENDBLOCKED ORGANPOLYSILOXANE PRODUCT FROM THE REACTION MIXTURE.
References Cited (Backward Citations)
US2796406A
Cited
US3046294A
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US3161611A
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US3078293A
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US3223474A
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US3046242A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1970-11-27 | 1971-05-29 | 1971-11-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-11-27 | 1975-05-29 | 1975-11-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-11-27 | 1979-05-29 | 1979-11-28 | $7700.00 | Window Closed / Lapsed |