US3803084A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for the production of high-polymer organo-siloxanes
Assignee: Bayer AG
•
Filing: 1972-01-28
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Granted: 1974-04-09
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Expires: 1992-01-28
Abstract
Abstract In the production of high polymer polyorgano-siloxane convertible to silicone elastomers, oligomeric organo-siloxanes and catalyst are stirred in an upright container. The stirring is effected with a spiral stirrer disposed along the wall of the container, while the center of the container is free of conveyor means for free axial flow of the polymerizing material therethrough.
Inventors
- 👤 K Schnurrbusch
- 👤 R Erdmenger
- 👤 W Kniege
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 05:03
CPC Classifications
B; B01; B01J; B01J19/00; B01J19/18; B01J19/20; B01F; B01F27/00; B01F27/05; B01F27/11; B01F27/114; B01F27/80; B01F27/92; B01F27/921; B01F27/9213; C; C08; C08G; C08G77/00; C08G77/04; C08G77/06
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
10 words
Process according to claim 1, the oligomeric organo-siloxanes being bifunctional.
Claim 2
Dependent Claim
10 words
Process according to claim 1, the oligomeric organo-siloxane being octamethyl-cyclotetrasiloxane.
Claim 3
Dependent Claim
120 words
In the treatment of high polymer polyorgano siloxane for stabilzation thereof or driving off volatile components therefrom, the improvement which comprises effecting said stirring in an upright container having a vertically disposed axis and an upwardly extending side wall, with a single spiral stirrer conforming to the wall of the container and disposed along and adjacent thereto and mounted by a frame on a rotatable shaft disposed axially in the container, for rotation with the shaft, the inwardly disposed periphery of the spiral stirrer being disposed adjacent the container wall leaving the center of the container free of conveyor means for free axial flow of the poly siloxane therethrough, said stirring being effected by rotating the stirrer in the container.
Claim 4
Dependent Claim
16 words
Process according to claim 1, said oligomeric organo-siloxane being octamethyl-cyclotetra-siloxane, and said catalyst being potassium hydroxide.
Claim 5
Dependent Claim
15 words
Process according to claim 4, said high polymer polyorgano siloxane being a polymer of octamethyl-cyclotetra-siloxane.
Claim 6
Dependent Claim
14 words
Process according to claim 1, said single spiral stirrer being a multiple thread spiral.
Claim 7
Dependent Claim
14 words
Process according to claim 4, said single spiral stirrer being a multiple thread spiral.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-04-08 | 1977-10-08 | 1978-04-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-04-08 | 1981-10-08 | 1982-04-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-04-08 | 1985-10-08 | 1986-04-09 | $7700.00 | Window Closed / Lapsed |