http://rdf.ncbi.nlm.nih.gov/pubchem/patent/BR-0000019-A
Outgoing Links
| Predicate | Object |
|---|---|
| assignee | http://rdf.ncbi.nlm.nih.gov/pubchem/patentassignee/MD5_a526baeaf0a6e90f4a91d4dbfd619756 |
| classificationCPCInventive | http://rdf.ncbi.nlm.nih.gov/pubchem/patentcpc/C08F36-04 |
| classificationIPCInventive | http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/C08F4-48 http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/C08F4-46 http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/C08F2-38 http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/C08F36-04 |
| filingDate | 2000-01-06-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| inventor | http://rdf.ncbi.nlm.nih.gov/pubchem/patentinventor/MD5_4b5cfc8f294d3985475146b51a31e76c http://rdf.ncbi.nlm.nih.gov/pubchem/patentinventor/MD5_3a777c42b54bb23428d124ea88a4f5f0 |
| publicationDate | 2000-11-28-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| publicationNumber | BR-0000019-A |
| titleOfInvention | Synthesis of high vinyl rubbers |
| abstract | "SYNTHESIS OF HIGH VINYL RUBBER" Metallic salts of saturated aliphatic alcohols can be used as modifiers in solution polymerizations initiated with lithium dienic monomers in rubber polymers. Sodium t-amylate is a preferred modifier, because of its exceptional solubility in non-polar aliphatic hydrocarbon solvents that are used as the medium for these solution polymerizations. However, the use of sodium t-amylate as the polymerization modifier in commercial operations, where recycling is required, can create certain problems. These problems arise from the fact that the sodium t-amylate reacts with water, forming t-amyl alcohol during the extractive steam distillation in the polymer finishing step. as t-amyl alcohol forms an azeotrope with hexane, it is co-distilled with hexane and therefore contaminates the feed stream. The present invention solves the problem of contamination of the recycling chain. This invention is based on the discovery of highly effective modifiers, which are not co-distilled with hexane, nor do they form compounds during extractive steam distillation that are co-distilled with hexane. The modifiers of this invention are metal salts of cyclic alcohols. As the boiling points of these metallic salts of cyclic alcohols are very high, they are not co-distilled with hexane, nor do they contaminate the recycling streams. In addition, metal salts of cyclic alcohols are considered environmentally safe. The present invention features, more specifically, an initiator system which is composed of (a) a lithium initiator, (b) a metal salt of a cyclic alcohol and (c) a polar modifier. |
| priorityDate | 1999-01-08-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| type | http://data.epo.org/linked-data/def/patent/Publication |
Incoming Links
Total number of triples: 32.