GB899939A - Acyloxy-end-blocked diorganopolysiloxanes - Google Patents
Acyloxy-end-blocked diorganopolysiloxanesInfo
- Publication number
- GB899939A GB899939A GB3333760A GB3333760A GB899939A GB 899939 A GB899939 A GB 899939A GB 3333760 A GB3333760 A GB 3333760A GB 3333760 A GB3333760 A GB 3333760A GB 899939 A GB899939 A GB 899939A
- Authority
- GB
- United Kingdom
- Prior art keywords
- preparation
- acetic anhydride
- acyloxy
- terminated siloxanes
- polymer
- 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
Abstract
A siloxane of the formula AcO(SiR2O)nAc, in which each R is a monovalent hydrocarbon or halogenated hydrocarbon radical, each Ac is a saturated aliphatic monoacyl radical of 1 to 3 C atoms and n is an integer greater than 9, may be made by reacting at above 50 DEG C. (1) an organosiloxane having attached to each Si atom 2 or 3 R radicals and (2) at least one mol. per mol. of (1) of acetic anhydride to produce a polymer having a degree of polymerization less than that of (1). If desired the reaction may be effected in the presence of a catalyst, e.g. boron triacetate or pyridine, and a solvent, e.g. toluene xylene or methyl isobutyl ketone. An alternative process is described in Specification 899,938. Examples describe the preparation of acyloxy-terminated siloxanes from hydroxy-terminated siloxanes and (1, 2 and 6) methylvinyldiacetoxysilane or (7) phenylmethyldipropionoxysilane, and the preparation using acetic anhydride is described in Examples 3, 4 and 5. Uses: The process is useful in salvaging silicone rubber stocks by breaking down a cured polymer or high molecular weight gum into usable liquid and gum components.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US85151859A | 1959-11-09 | 1959-11-09 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB899939A true GB899939A (en) | 1962-06-27 |
Family
ID=25310969
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB3333760A Expired GB899939A (en) | 1959-11-09 | 1960-09-28 | Acyloxy-end-blocked diorganopolysiloxanes |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB899939A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3627729A (en) * | 1969-07-30 | 1971-12-14 | Midland Silicones Ltd | Catalyzed silicone resin molding composition |
| CN113754888A (en) * | 2020-06-02 | 2021-12-07 | 赢创运营有限公司 | Linear acetoxy-containing siloxanes and derivatives |
-
1960
- 1960-09-28 GB GB3333760A patent/GB899939A/en not_active Expired
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3627729A (en) * | 1969-07-30 | 1971-12-14 | Midland Silicones Ltd | Catalyzed silicone resin molding composition |
| CN113754888A (en) * | 2020-06-02 | 2021-12-07 | 赢创运营有限公司 | Linear acetoxy-containing siloxanes and derivatives |
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