US3872146A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process of removing sulfate groups from organopolysiloxanes
Assignee: Evonik Operations GmbH
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Filing: 1974-05-22
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Granted: 1975-03-18
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Expires: 1994-05-22
Abstract
Abstract In the disclosed process, sulfate groups are removed from organopolysiloxanes which contain groups in which the sulfate groups to be removed are intramolecularly and/or terminally linked to silicon atoms. According to the inventive process, the organopolysiloxanes are reacted with peralkylated amides of carboxylic acids, phosphonic acids and/or phosphoric acids, whereby a SO3-containing peralkylated acid amide phase is obtained. This phase is then separated from the system. According to a preferred embodiment of the invention, the reaction with the peralkylated amide of the indicated acids is repeated one or several times.
Inventors
- 👤 Gerd Rossmy
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 20:35
CPC Classifications
C; C08; C08G; C08G77/00; C08G77/04; C08G77/06; C08G77/38; C08G77/48
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
62 words
A PROCESS OF REMOVING SULFATE GROUPS FROM POLYSILOXANES WHICH CONTAIN GROUPS IN WHICH SULFATE GROUPS ARE INTRAMOLECULARLY AND OR TERMINALLY LINKED TO SILICON ATOMS, WHICH COMPRISES REACTING SAID POLYSILOXANES WITH PERALKYLATED AMIDES OF AT LEAST ONE ACID SELECTED FROM THE GROUP CONSISTING OF CARBOXYLIC ACIDS, PHOSPHONIC ACIDS PHOSPHORIC ACIDS, WHEREBY AN SO3-CONTAINING PERALKYLATED ACID AMIDE PHASE IS OBTAINED AND SEPARATING SAID PHASE.
Claim 2
Dependent Claim
62 words
A PROCESS OF REMOVING SULFATE GROUPS FROM POLYSILOXANES WHICH CONTAIN GROUPS IN WHICH SULFATE GROUPS ARE INTRAMOLECULARLY AND OR TERMINALLY LINKED TO SILICON ATOMS, WHICH COMPRISES REACTING SAID POLYSILOXANES WITH PERALKYLATED AMIDES OF AT LEAST ONE ACID SELECTED FROM THE GROUP CONSISTING OF CARBOXYLIC ACIDS, PHOSPHONIC ACIDS PHOSPHORIC ACIDS, WHEREBY AN SO3-CONTAINING PERALKYLATED ACID AMIDE PHASE IS OBTAINED AND SEPARATING SAID PHASE.
Claim 3
Dependent Claim
49 words
A process as claimed in claim 1, wherein the reaction is effected by agitating or shaking said polysiloxanes with said peralkylated amides and wherein, after separation of said phase, a fresh amount of peralkylated amide is agitated or shaken with said polysiloxane to remove additional amounts of sulfate groups.
Claim 4
Dependent Claim
32 words
A process as claimed in claim 2, wherein the addition of fresh amounts of peralkylated amide and the subsequent phase separation are repeated until the polysiloxane is substantially devoid of sulfate groups.
Claim 5
Dependent Claim
15 words
A process as claimed in claim 1, wherein said peralkylated amide is a permethylated amide.
Claim 6
Dependent Claim
23 words
A process as claimed in claim 4, wherein the permethylated acid amide is selected from the group consisting of dimethylformamide, dimethylacetamide and hexamethylphosphoricacidtriamide.
Claim 7
Dependent Claim
24 words
A process as claimed in claim 1, wherein said peralkylated acidamide is selected from the group consisting of N-N''-tetramethylurea, diethylformamide, N-tetramethyl-ethylphosphonicaciddiamide, N-N''-tetraethylurea and diethylacetamide.
Claim 8
Dependent Claim
28 words
A process as claimed in claim 1, wherein the amount of peralkylated amide is in excess to the equivalent of the amount of sulfate groups in said polysiloxane.
Claim 9
Dependent Claim
22 words
A process as claimed in claim 1, wherein the reaction is carried out within a temperature range of about 10* to 80*C.
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) | 1978-03-17 | 1978-09-16 | 1979-03-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-03-17 | 1982-09-16 | 1983-03-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-03-17 | 1986-09-16 | 1987-03-18 | $7700.00 | Window Closed / Lapsed |