http://rdf.ncbi.nlm.nih.gov/pubchem/patent/GB-768755-A
Outgoing Links
| Predicate | Object |
|---|---|
| assignee | http://rdf.ncbi.nlm.nih.gov/pubchem/patentassignee/MD5_b30d807376962224a66aa244d678104a |
| classificationCPCInventive | http://rdf.ncbi.nlm.nih.gov/pubchem/patentcpc/C08G77-00 |
| classificationIPCInventive | http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/C08G77-00 |
| filingDate | 1955-02-16-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| publicationDate | 1957-02-20-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| publicationNumber | GB-768755-A |
| titleOfInvention | Preparation of silicone oils |
| abstract | Polysiloxane oils are prepared by condensing a mixture of organosilanes of R/Si ratio between 1.5 and 2 and containing equivalent quantities of hydrolysable halogen and alkoxy groups until more than half, e.g. 85 per cent or more of the halogen has been eliminated as alkyl halide, and end-blocking the product by reaction with a quantity of a triorganosilanol equivalent to the remaining halogen and alkoxy content. A solvent, e.g. toluene, may be used during the condensation, preferably during the concluding stages only. The viscosity of the final product depends on (a) the initial R/Si ratio; (b) the degree of condensation; (c) the concentration of reactants in the condensation mixture. In Example (1) a methylchloroalkoxysilane mixture of CH3:Si ratio 1.73 was refluxed in the presence of ferric chloride until 74 per cent of the chlorine had been removed. The product was diluted with toluene and heated further until only 4 per cent chlorine remained. After cooling, trimethylsilanol was added and allowed to react in the cold. The final product was washed and distilled at 20 mm. pressure and up to 150 DEG C. to yield an oil of 1360 cP. viscosity in 83 per cent yield. Similar procedures eliminating all but 1.8 per cent and 8 per cent chlorine gave oils of viscosities 4300 cP. and 60 cP. respectively. Examples (2), (3) and (4) describe similar procedures for obtaining oils of varying viscosities by varying the CH3:Si ratio, the degree of dilution with toluene in the later stages and the amount of chlorine eliminated. Specification 700,101 is referred to. |
| isCitedBy | http://rdf.ncbi.nlm.nih.gov/pubchem/patent/US-4387196-A http://rdf.ncbi.nlm.nih.gov/pubchem/patent/CN-111072971-A http://rdf.ncbi.nlm.nih.gov/pubchem/patent/GB-2451215-A |
| priorityDate | 1954-02-25-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| type | http://data.epo.org/linked-data/def/patent/Publication |
Incoming Links
Total number of triples: 21.