US3338870A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Preparation of silarylenesilanol and polysilarylenesiloxanols
Assignee: Wacker Chemie AG
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Filing: 1966-03-07
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Granted: 1967-08-29
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Expires: 1986-03-07
Abstract
No abstract record available.
Inventors
- 👤 Nitzsche Siegfried
- 👤 Buchheit Paul
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 18:23
CPC Classifications
C; C07; C07F; C07F7/00; C07F7/02; C07F7/08; C07F7/0834; C07F7/0836; C07F7/0838; C07F7/0872; C07F7/0874; C08; C08G; C08G77/00; C08G77/48; C08G77/50; C08G77/52
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
162 words
THE METHOD FOR PREPARING SILARYLENESILANOLS OR POLYSILARYLENSILOXANOLS COMPRISING (1) REACTING A POLYSILARYLENESILOXANE WHEREIN THE ARYLENE RADICALS ARE PARA ISOMERS WITH AT LEAST ONE MOL OF ALKALI METAL HYDROXIDE PER MOL OF POLYSILARYLENESILOXANE, THE ALKALI METAL HYDROXIDE BEING EMPLOYED AS AN 8 TO 14 NORMAL-SOLUTION IN A MEDIUM SELECTED FROM THE GROUP CONSISTING OF WATER, LOWER MONOHYDRIC ALCOHOLS, AND MIXTURES THEREOF, THE REACTION BEING CARRIED OUT BY ADDING THE POLYSILARYLENE SILOXANE TO THE ALKALI METAL HYDROXIDE AND AT A TEMPERATURE IN THE RANGE OF ABOUT 1K* TO 50*C. FOR A PERIOD OF FROM ABOUT 3 TO 130 HOURS AND (2) THEREAFTER REACTING THE PRODUCT FROM (1) WITH AN ACID HAVING A DISSOCIATION CONSTANT OF AT LEAST 4X10**--7 WHEN MEASURED IN AN AQUEOUS 0.1 NORMAL SOLUTION AT 25*C., THE REACTION (2) BEING CARRIED FORWARD AT A TEMPERATURE IN THE RANGE OF ABOUT 0* TO 50*C. AND EMPLOYING ACID IN AMOUNT AT LEAST EQUIVALENT TO THE AMOUNT OF ALKALI METAL HYDROXIDE EMPLOYED IN REATION (1).
Claim 2
Independent Claim
162 words
THE METHOD FOR PREPARING SILARYLENESILANOLS OR POLYSILARYLENSILOXANOLS COMPRISING (1) REACTING A POLYSILARYLENESILOXANE WHEREIN THE ARYLENE RADICALS ARE PARA ISOMERS WITH AT LEAST ONE MOL OF ALKALI METAL HYDROXIDE PER MOL OF POLYSILARYLENESILOXANE, THE ALKALI METAL HYDROXIDE BEING EMPLOYED AS AN 8 TO 14 NORMAL-SOLUTION IN A MEDIUM SELECTED FROM THE GROUP CONSISTING OF WATER, LOWER MONOHYDRIC ALCOHOLS, AND MIXTURES THEREOF, THE REACTION BEING CARRIED OUT BY ADDING THE POLYSILARYLENE SILOXANE TO THE ALKALI METAL HYDROXIDE AND AT A TEMPERATURE IN THE RANGE OF ABOUT 1K* TO 50*C. FOR A PERIOD OF FROM ABOUT 3 TO 130 HOURS AND (2) THEREAFTER REACTING THE PRODUCT FROM (1) WITH AN ACID HAVING A DISSOCIATION CONSTANT OF AT LEAST 4X10**--7 WHEN MEASURED IN AN AQUEOUS 0.1 NORMAL SOLUTION AT 25*C., THE REACTION (2) BEING CARRIED FORWARD AT A TEMPERATURE IN THE RANGE OF ABOUT 0* TO 50*C. AND EMPLOYING ACID IN AMOUNT AT LEAST EQUIVALENT TO THE AMOUNT OF ALKALI METAL HYDROXIDE EMPLOYED IN REATION (1).
References Cited (Backward Citations)
US2202634A
Cited
US3209018A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1970-08-28 | 1971-02-27 | 1971-08-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-08-28 | 1975-02-27 | 1975-08-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-08-28 | 1979-02-27 | 1979-08-29 | $7700.00 | Window Closed / Lapsed |