US4044038A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for the manufacture of at least substantially balanced organopolysiloxane mixtures with silyl halide groupings
Assignee: Evonik Operations GmbH
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Filing: 1976-05-04
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Granted: 1977-08-23
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Expires: 1996-05-04
Abstract
Abstract The invention relates to a process for the preparation of at least substantially equilibrated organopolysiloxane mixtures with silyl halide groupings through redistribution of siloxane and silyl halide groupings in the process of equilibrating catalysts, if necessary at elevated temperatures.
Inventors
- 👤 Gerd Rossmy
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 14:43
CPC Classifications
C; C08; C08G; C08G77/00; C08G77/04; C08G77/06; C08G77/10; C07; C07F; C07F7/00; C07F7/02; C07F7/08; C07F7/0834; C07F7/0838; C07F7/0872; C07F7/0874
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
132 words
In a process of preparing at least approximately equilibrated organopolysiloxane mixtures having silylhalide groups, by redistribution of siloxane and silylhalide groups, wherein mixtures of organohalogensilanes and organopolysiloxanes or mixtures of organopolysiloxanes with terminal silylhalide groups are equilibrated in the presence of an equilibration catalyst, the molecular weight distribution or the distribution of the individual siloxane structures of the mixtures to be treated deviating from the statistical equilibrium, the improvement which comprises that the equilibration treatment is performed in the presence of an equilibration catalyst which is a mixed catalyst comprising a. hydrogen halide acid and b. peralkylated acid amide, the amount of said mixed catalyst being in the range of 0.002 to 0.2 mole per siloxane bond, said mixed catalyst being removed from the system after the equilibration treatment by phase separation.
Claim 2
Dependent Claim
132 words
In a process of preparing at least approximately equilibrated organopolysiloxane mixtures having silylhalide groups, by redistribution of siloxane and silylhalide groups, wherein mixtures of organohalogensilanes and organopolysiloxanes or mixtures of organopolysiloxanes with terminal silylhalide groups are equilibrated in the presence of an equilibration catalyst, the molecular weight distribution or the distribution of the individual siloxane structures of the mixtures to be treated deviating from the statistical equilibrium, the improvement which comprises that the equilibration treatment is performed in the presence of an equilibration catalyst which is a mixed catalyst comprising a. hydrogen halide acid and b. peralkylated acid amide, the amount of said mixed catalyst being in the range of 0.002 to 0.2 mole per siloxane bond, said mixed catalyst being removed from the system after the equilibration treatment by phase separation.
Claim 3
Dependent Claim
19 words
The improvement of claim 1, wherein said acid of a. is HCl, while said amide of b. is dimethylformamide.
Claim 4
Dependent Claim
21 words
The improvement of claim 1, wherein the equilibration treatment is carried out at a temperature of > 50° to 110° C.
Claim 5
Dependent Claim
20 words
The improvement of claim 1, wherein the equilibration treatment is carried out under a pressure which is above atmospheric pressure.
Claim 6
Dependent Claim
31 words
The improvement of claim 1, wherein the equilibration treatment is carried out in a closed reaction vessel at that pressure which is the corollary of the temperature of the reaction mixture.
Claim 7
Dependent Claim
26 words
The improvement of claim 1, wherein said mixed catalyst essentially consists of dimethylformamide . 2 HCl and said equilibration treatment is performed at about 100° C.
Claim 8
Dependent Claim
12 words
The improvement of claim 1, wherein said silylhalide groups are SiCl groups.
Claim 9
Dependent Claim
33 words
The improvement of claim 1, wherein said catalyst additionally contains HFeCl 4 in amounts of 1 ppm to 1 percent by weight, calculated on each siloxane bond in the mixture to be equilibrated.
Claim 10
Dependent Claim
17 words
The improvement of claim 8, wherein 0.001 to 0.1 percent by weight of HFeCl 4 is used.
Claim 11
Dependent Claim
15 words
The improvement of claim 1, wherein the equilibration treatment is performed in stage wise manner.
Claim 12
Dependent Claim
36 words
The improvement of claim 10, wherein the equilibration treatment is initiated with said HFeCl 4 whereafter the equilibration treatment is continued and terminated with said mixed catalyst of (a) and (b) in one or several stages.
Claim 13
Dependent Claim
22 words
The improvement of claim 1, wherein said mixed catalyst of (a) and (b) is in the form of liquid mixtures or complexes.
Claim 14
Dependent Claim
20 words
The improvement of claim 1, wherein said mixed catalyst is a room-temperature saturated solution of hydrogen halide acid in dimethylformamide.
References Cited (Backward Citations)
US2421653A
Cited
US3661962A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1980-08-22 | 1981-02-21 | 1981-08-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-08-22 | 1985-02-21 | 1985-08-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-08-22 | 1989-02-21 | 1989-08-23 | $7700.00 | Window Closed / Lapsed |