http://rdf.ncbi.nlm.nih.gov/pubchem/patent/CA-1311326-C
Outgoing Links
| Predicate | Object |
|---|---|
| assignee | http://rdf.ncbi.nlm.nih.gov/pubchem/patentassignee/MD5_bd7ed215807b95cccfce4fa200817adb |
| classificationCPCInventive | http://rdf.ncbi.nlm.nih.gov/pubchem/patentcpc/C08G77-32 http://rdf.ncbi.nlm.nih.gov/pubchem/patentcpc/C08G77-08 http://rdf.ncbi.nlm.nih.gov/pubchem/patentcpc/C08G77-16 |
| classificationIPCInventive | http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/C08G77-16 http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/C08L83-06 http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/C08G77-08 http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/C08L83-04 http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/C08G77-32 http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/C08G77-22 |
| filingDate | 1988-10-12-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| grantDate | 1992-12-08-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| inventor | http://rdf.ncbi.nlm.nih.gov/pubchem/patentinventor/MD5_0c8175d821dbacc53a183d23fe2e2581 |
| publicationDate | 1992-12-08-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| publicationNumber | CA-1311326-C |
| titleOfInvention | Preparation of hydroxy terminated polysiloxanes |
| abstract | Abstract of the Disclosure The specification discloses a method of preparing a poly-siloxane by chain extension of a silicon compound having chain terminating units including a silicon-bonded hydroxyl group which comprises bringing about condensation of the silicon-bonded hydroxyl groups at a temperature of less than 50°C in presence of an acidic condensation catalyst of the formula RSO3H and water, to an extent of less than 7 moles per mole of acidic condensation catalyst. The silicon compound may comprise a hydroxyl end-blocked polydimethylsiloxane having a viscosity at 25°C in the range 30 to 100,000 mm2/s, and it may be polymerised to provide an .alpha.,.omega. dihydroxy polydimethylsiloxane having a viscosity in the range 1,000 mm2/s to 100,000 mm2/s or more. Preferred acidic condensation catalysts are those in which R is an alkyl group having a chain of 6 to 18 carbon atoms or a group R"C6H4 where R" represents a hydrogen atom or an alkyl group having a chain of 6 to 18 carbon atoms. The preferred catalyst is dodecylbenzenesulphonic acid. A basic material may be added to the reaction mixture to neutralise said catalyst for example calcium carbonate or magnesium carbonate. The reaction mixture may be compounded to provide a curable composition, for example a moisture curable sealant composition comprising a mixture and/ or a reaction product of the polysiloxane and a curative, a catalyst and finely divided filler. |
| priorityDate | 1987-10-24-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| type | http://data.epo.org/linked-data/def/patent/Publication |
Incoming Links
Total number of triples: 56.