US4460726A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for stabilizing organopolysiloxanes
Assignee: Wacker Chemie AG
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Filing: 1983-09-16
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Granted: 1984-07-17
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Expires: 2003-09-16
Abstract
Abstract A method for stabilizing organopolysiloxanes containing phosphonitrile chlorides or their reaction products which promote the condensation and/or equilibration of organopolysiloxanes which comprises reacting at least one compound containing at least one epoxy group per molecule with the phosphorus compounds present in the organopolysiloxanes.
Inventors
- 👤 Peter Huber
- 👤 Rudolf Kaufmann
- 👤 Juurgen Burkhardt
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 08:39
CPC Classifications
C; C08; C08G; C08G77/00; C08G77/04; C08G77/32; C08G77/06; C08G77/08
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
39 words
A method for stabilizing organopolysiloxanes, which contain phosphonitrile chlorides and/or reaction products thereof against changes in viscosity which comprises adding at least one compound containing at least one epoxy group per molecule to the organopolysiloxanes containing the phosphorus compounds.
Claim 2
Independent Claim
39 words
A method for stabilizing organopolysiloxanes, which contain phosphonitrile chlorides and/or reaction products thereof against changes in viscosity which comprises adding at least one compound containing at least one epoxy group per molecule to the organopolysiloxanes containing the phosphorus compounds.
Claim 3
Dependent Claim
31 words
The method of claim 1, wherein the compound containing at least one epoxy group per molecule is reacted with the phosphorus compounds at a temperature of from 0° to 200° C.
Claim 4
Dependent Claim
46 words
The method of claim 1, wherein the compound containing at least one epoxy group per molecule is present in an amount of at least 2 gram-atoms oxygen in the epoxy group per gram-equivalent PNCl 2 in the phosphonitrile chlorides used in the preparation of the organopolysiloxanes.
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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) | 1987-07-17 | 1988-01-16 | 1988-07-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-07-17 | 1992-01-16 | 1992-07-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-07-17 | 1996-01-16 | 1996-07-17 | $7700.00 | Window Closed / Lapsed |