GB942624A - Process for stabilising organopolysiloxanes - Google Patents
Process for stabilising organopolysiloxanesInfo
- Publication number
- GB942624A GB942624A GB44521/61A GB4452161A GB942624A GB 942624 A GB942624 A GB 942624A GB 44521/61 A GB44521/61 A GB 44521/61A GB 4452161 A GB4452161 A GB 4452161A GB 942624 A GB942624 A GB 942624A
- Authority
- GB
- United Kingdom
- Prior art keywords
- alkali
- bromoalkane
- specifications
- atoms
- hydrocarbon
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
Classifications
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
- C08G77/00—Macromolecular compounds obtained by reactions forming a linkage containing silicon with or without sulfur, nitrogen, oxygen or carbon in the main chain of the macromolecule
- C08G77/04—Polysiloxanes
- C08G77/32—Post-polymerisation treatment
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K5/00—Use of organic ingredients
- C08K5/02—Halogenated hydrocarbons
Landscapes
- Chemical & Material Sciences (AREA)
- Health & Medical Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Medicinal Chemistry (AREA)
- Polymers & Plastics (AREA)
- Organic Chemistry (AREA)
Abstract
An alkali-metal catalysed rubber-forming organopolysiloxane is stabilized by intimately dispensing a minor amount of a bromoalkane of the formula: <FORM:0942624/C3/1> wherein R is H, or a monovalent hydrocarbon or halo-hydrocarbon radical having up to 4 C atoms, throughout the siloxane and heating the mixture to a temperature within the range of 50 DEG to 250 DEG C. The convertible siloxanes used may contain Si-bonded hydrocarbon (saturated or unsaturated), halohydrocarbon or cyanoalkyl radicals or terminal OH groups, as described in U.S.A. Specifications 2,448,556, 2,448,756, 2,457,688, 2,484,595, 2,490,357, 2,521,528, 2,541,137 and 2,843,555. The bromoalkane is generally added in an amount sufficient to provide at least 6 atoms of bromine per atom of alkali-metal based on the equivalent weight of the alkali-metal catalyst used in the polymerization. In Examples, 1,2,3-tri-bromopropane was used to stabilise a KOH-equilibrated dimethylpolysiloxane. U.S.A. Specifications 2,567,110, 2,739,952 and 2,789,109 also are referred to.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US75131A US3153007A (en) | 1960-12-12 | 1960-12-12 | Process for making organopolysiloxanes using bromoalkane decatalyzing agents for excess alkali-metal catalysts |
| FR881373A FR1307715A (en) | 1960-12-12 | 1961-12-08 | Process for manufacturing organopolysiloxanes |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB942624A true GB942624A (en) | 1963-11-27 |
Family
ID=26193422
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB44521/61A Expired GB942624A (en) | 1960-12-12 | 1961-12-12 | Process for stabilising organopolysiloxanes |
Country Status (2)
| Country | Link |
|---|---|
| FR (1) | FR1307715A (en) |
| GB (1) | GB942624A (en) |
-
1961
- 1961-12-08 FR FR881373A patent/FR1307715A/en not_active Expired
- 1961-12-12 GB GB44521/61A patent/GB942624A/en not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| FR1307715A (en) | 1962-10-26 |
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