http://rdf.ncbi.nlm.nih.gov/pubchem/patent/GB-631493-A
Outgoing Links
| Predicate | Object |
|---|---|
| assignee | http://rdf.ncbi.nlm.nih.gov/pubchem/patentassignee/MD5_af99df08b153738cd418446a75d09bfc |
| classificationCPCInventive | http://rdf.ncbi.nlm.nih.gov/pubchem/patentcpc/C08G77-00 |
| classificationIPCInventive | http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/C08G77-00 |
| filingDate | 1947-06-20-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| publicationDate | 1949-11-03-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| publicationNumber | GB-631493-A |
| titleOfInvention | Improvements in or relating to the preparation of organo-siloxane polymers |
| abstract | An organo-bromo-silane or -chlorosilane is reacted with a substantially anhydrous tertiary alcohol to produce organo siloxane polymers. A silicon tetrahalide may also be admixed with the organo-halosilane. The relative molecular proportions may be varied; the tertiary alcohol may be in excess and the reaction conducted under reflux so as to remove hydrogen halide, and tertiary alkyl halide eventually distilled from the polymer, or the tertiary alcohol may be in restricted amount and the reaction conducted under such conditions, e.g. in a closed reactor, or at lower temperature, as to produce a polymer retaining some halogen atoms. In the latter instance, the product may be subjected to further hydrolysis and condensation to produce higher polymers. Any of the lower polymers may be further polymerized as by blowing with air at an elevated temperature. Tertiary butyl or tertiary amyl alcohol are the preferred alcohols and a specific list of exemplary organo-halosilanes includes various organo mono-, di- and tri-halosilanes such as methyl trichlorosilane, dimethyl dichlorosilane, octyl trichlorosilane, triphenyl bromosilane, di(octadecyl) dichlorosilane, naphthyl trichlorosilane, and others. In examples, reaction was effected between tertiary butyl alcohol and (1) diethyl dichlorosilane, to give a polymer mixture which on distillation gave 4 fractions of the apparent composition hexaethyl cyclotrisiloxane; octaethyl cyclotetrasiloxane; decaethyl cyclopentasiloxane; high boiling polymers; (2) ethyl trichlorosilane, under conditions to give an oil having 22 per cent by weight of hydrolysable chlorine; (3) phenyl ethyl dichlorosilane; (5) phenyl trichlorosilane; (6) a mixture of ethyl trichlorosilane and phenyl ethyl dichlorosilane to give a polymer containing chlorine; (7) isopropyl trichlorosilane; (8) ethyl trichlorosilane and ethyl phenyl dichlorosilane, the two chlorine-containing polymers being admixed and treated with further tertiary butyl alcohol; and (5) tertiary amyl alcohol was reacted with ethyl phenyl dichlorosilane. |
| priorityDate | 1946-07-08-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| type | http://data.epo.org/linked-data/def/patent/Publication |
Incoming Links
Total number of triples: 44.