http://rdf.ncbi.nlm.nih.gov/pubchem/patent/US-6187873-B1
Outgoing Links
| Predicate | Object |
|---|---|
| assignee | http://rdf.ncbi.nlm.nih.gov/pubchem/patentassignee/MD5_50907fc1b392e2bf592f74fb8123032d |
| classificationCPCInventive | http://rdf.ncbi.nlm.nih.gov/pubchem/patentcpc/C08F6-02 |
| classificationIPCInventive | http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/C08F6-02 |
| filingDate | 1998-08-06-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| grantDate | 2001-02-13-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| inventor | http://rdf.ncbi.nlm.nih.gov/pubchem/patentinventor/MD5_c36d2297d23851aa681a16c35c7691dc http://rdf.ncbi.nlm.nih.gov/pubchem/patentinventor/MD5_06ebb39eec2454c48ea316018f8e9fb9 http://rdf.ncbi.nlm.nih.gov/pubchem/patentinventor/MD5_fa8110ce415463ec25c81185180325c8 |
| publicationDate | 2001-02-13-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| publicationNumber | US-6187873-B1 |
| titleOfInvention | Increased throughput in the manufacture of block copolymers by reduction in polymer cement viscosity through the addition of polar solvents |
| abstract | This invention is an improvement upon the current process for the production of block copolymers, especially hydrogenated block copolymers, of conjugated dienes and/or vinyl aromatic hydrocarbons which comprises anionically polymerizing the monomers in an inert hydrocarbon solvent in the presence of an alkali metal initiator whereby a polymer cement is produced and then contacting the cement with hydrogen under hydrogenation conditions in the presence of a hydrogenation catalyst. This invention and the improvement to the foregoing process comprises reducing the viscosity of the polymer cement by adding to it, preferably prior to hydrogenation (if the polymer is to be hydrogenated), from 2 to 50 % wt of a polar compound. The polar compound must be a poorer solvent for the block copolymer than is the inert hydrocarbon solvent. Preferred polar compounds include diethyl ether, tetrahydrofuran, diethoxyethane, monoglyme, diglyme, diethoxypropane, dioxane ortho-dimethoxybenzene, and the like. |
| isCitedBy | http://rdf.ncbi.nlm.nih.gov/pubchem/patent/CN-109734828-A http://rdf.ncbi.nlm.nih.gov/pubchem/patent/US-2005065287-A1 http://rdf.ncbi.nlm.nih.gov/pubchem/patent/US-7166679-B2 |
| priorityDate | 1997-08-07-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| type | http://data.epo.org/linked-data/def/patent/Publication |
Incoming Links
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