GB804098A - Cyclosiloxanes - Google Patents
CyclosiloxanesInfo
- Publication number
- GB804098A GB804098A GB9316/57A GB931657A GB804098A GB 804098 A GB804098 A GB 804098A GB 9316/57 A GB9316/57 A GB 9316/57A GB 931657 A GB931657 A GB 931657A GB 804098 A GB804098 A GB 804098A
- Authority
- GB
- United Kingdom
- Prior art keywords
- prepared
- siloxanes
- radical
- formula
- cyclics
- 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
- C08G77/14—Polysiloxanes containing silicon bound to oxygen-containing groups
-
- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07F—ACYCLIC, CARBOCYCLIC OR HETEROCYCLIC COMPOUNDS CONTAINING ELEMENTS OTHER THAN CARBON, HYDROGEN, HALOGEN, OXYGEN, NITROGEN, SULFUR, SELENIUM OR TELLURIUM
- C07F7/00—Compounds containing elements of Groups 4 or 14 of the Periodic System
- C07F7/02—Silicon compounds
- C07F7/21—Cyclic compounds having at least one ring containing silicon, but no carbon in the ring
Abstract
The invention comprises cyclic siloxanes of the formula <FORM:0804098/IV (a)/1> where x is 3 or 4, and R is an alkyl radical of 1 to 4 carbon atoms. They are prepared by thermal or catalytic cracking of the hydrolysis products of silanes of the formula ROOC.CH(CH3)CH2Si(CH3)X2 where X is a hydrolysable radical such as chlorine, bromine or alkoxy. These silanes may be prepared by reacting, e.g., CH3SiHCl2 with an alkyl methacrylate in the presence of chloroplatinic acid, as described in Specification 804,097. Thermal cracking of the hydrolysate is effected at about 300 DEG C. Catalytic cracking is effected at 200 DEG to 300 DEG C., suitable catalysts being sodium or potassium hydroxide. Small yields of the cyclics can be obtained by distillation of the hydrolysate. The compounds may be copolymerized with other siloxanes of the general formula R1mSiO 4-m/2 , where R1\h is a monovalent hydrocarbon or halogenated hydrocarbon radical, by heating the two siloxanes at 140 DEG to 175 DEG C. in the presence of alkaline catalysts. The cyclics are useful as lubricants and as intermediates, e.g. by reacting with polyhydric alcohols in the production of modified alkyds. In the examples, the methyl, ethyl and butyl esters are prepared. Specifications 706,290, 769,496 and 788,842 also are referred to.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US804098XA | 1956-07-17 | 1956-07-17 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB804098A true GB804098A (en) | 1958-11-05 |
Family
ID=22157174
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB9316/57A Expired GB804098A (en) | 1956-07-17 | 1957-03-21 | Cyclosiloxanes |
Country Status (3)
| Country | Link |
|---|---|
| DE (1) | DE1053507B (en) |
| FR (1) | FR1178225A (en) |
| GB (1) | GB804098A (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4874868A (en) * | 1988-03-16 | 1989-10-17 | The Procter & Gamble Company | Volatile silicons |
-
1957
- 1957-03-21 GB GB9316/57A patent/GB804098A/en not_active Expired
- 1957-07-05 FR FR1178225D patent/FR1178225A/en not_active Expired
- 1957-07-09 DE DED25954A patent/DE1053507B/en active Pending
Also Published As
| Publication number | Publication date |
|---|---|
| DE1053507B (en) | 1959-03-26 |
| FR1178225A (en) | 1959-05-05 |
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