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US2934550A
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Preparation of cyclic methylpolysiloxanes by reacting organopolysiloxanes with halides of aluminum or phosphorus
Assignee: Imperial Chemical Industries Ltd
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Filing: 1958-12-08
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Granted: 1960-04-26
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Expires: 1978-12-08
Abstract
No abstract record available.
Inventors
- 👤 Jack James
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 08:27
CPC Classifications
C; C08; C08G; C08G77/00; C08G77/04; C08G77/38; C07; C07F; C07F7/00; C07F7/02; C07F7/21
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
65 words
A PROCESS FOR THE PRODUCTION OF LOW MOLECULAR WEIGHT CYCLIC METHYL POLYSILOXANES COMPRISING REACTING TOGETHER A HIGH MOLECULAR WEIGHT SUBSTANTIALLY LINEAR METHYL POLYSILOXANE WITH A SUBSTANCE FROM THE CLASS CONSISTING OF HALIDES OF ALUMINIUM AND HALIDES OF PHOSPHORUS IN AN AMOUNT NOT MORE THAN 30% BY WEIGHT AT NOT LESS THAN 250* C. UNDER SUBSTANTIALLY ANHYDROUS CONDITIONS AND SIMULTANEOUSLY DISTILLING OFF THE SO-PRODUCED CYCLIC POLYSILOXANES.
Claim 2
Dependent Claim
65 words
A PROCESS FOR THE PRODUCTION OF LOW MOLECULAR WEIGHT CYCLIC METHYL POLYSILOXANES COMPRISING REACTING TOGETHER A HIGH MOLECULAR WEIGHT SUBSTANTIALLY LINEAR METHYL POLYSILOXANE WITH A SUBSTANCE FROM THE CLASS CONSISTING OF HALIDES OF ALUMINIUM AND HALIDES OF PHOSPHORUS IN AN AMOUNT NOT MORE THAN 30% BY WEIGHT AT NOT LESS THAN 250* C. UNDER SUBSTANTIALLY ANHYDROUS CONDITIONS AND SIMULTANEOUSLY DISTILLING OFF THE SO-PRODUCED CYCLIC POLYSILOXANES.
References Cited (Backward Citations)
US2589317A
Cited
US2645654A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1963-04-26 | 1963-10-26 | 1964-04-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-04-26 | 1967-10-26 | 1968-04-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-04-26 | 1971-10-26 | 1972-04-26 | $7700.00 | Window Closed / Lapsed |