US4564693A
Expired / Lapsed
US
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Process for stabilizing organopolysiloxanes
Assignee: Wacker Chemie AG
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Filing: 1985-08-02
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Granted: 1986-01-14
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Expires: 2005-08-02
Abstract
Abstract A process for stabilizing organopolysiloxanes against changes in viscosity which comprises reacting organopolysiloxanes containing phosphonitrile chlorides or reaction products thereof with at least one lithium compound which forms lithium chloride when reacted with the chlorine bonded to the phosphorous compound.
Inventors
- 👤 Manfred Riederer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 17:52
CPC Classifications
C; C08; C08G; C08G77/00; C08G77/04; C08G77/32; C08G77/06; C08G77/08
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
57 words
A process for stabilizing organopolysiloxanes prepared by condensation and/or equilibration of organosilicon compounds having Si-bonded oxygen in the presence of phosphorous compounds consisting of phosphonitrile chlorides and reaction products thereof, which comprises reacting the phosphorous compounds present in the organopolysiloxanes with at least one lithium compound which yields lithium chloride on reaction with chlorine bonded to phosphorous.
Claim 2
Dependent Claim
57 words
A process for stabilizing organopolysiloxanes prepared by condensation and/or equilibration of organosilicon compounds having Si-bonded oxygen in the presence of phosphorous compounds consisting of phosphonitrile chlorides and reaction products thereof, which comprises reacting the phosphorous compounds present in the organopolysiloxanes with at least one lithium compound which yields lithium chloride on reaction with chlorine bonded to phosphorous.
Claim 3
Dependent Claim
12 words
The process of claim 1, wherein the lithium compound is lithium hydroxide.
Claim 4
Dependent Claim
30 words
The process of claim 1, wherein the lithium compound is used in an amount of from 1 to 5 gram-atoms of lithium per gram-atom of phosphorous in the phosphonitrile chlorides.
Claim 5
Dependent Claim
30 words
The process of claim 3, wherein the lithium compound is used in an amount of from 1 to 5 gram-atoms of lithium per gram-atom of phosphorous in the phosphonitrile chlorides.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1989-01-13 | 1989-07-15 | 1990-01-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-01-13 | 1993-07-15 | 1994-01-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-01-13 | 1997-07-15 | 1998-01-14 | $7700.00 | Window Closed / Lapsed |