| Predicate |
Object |
| assignee |
http://rdf.ncbi.nlm.nih.gov/pubchem/patentassignee/MD5_0a521cfa321c963978df8ae98a84056a |
| classificationCPCInventive |
http://rdf.ncbi.nlm.nih.gov/pubchem/patentcpc/C07C51-367 |
| classificationIPCInventive |
http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/C07C59-125
http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/C07C51-367 |
| filingDate |
1997-08-27-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| grantDate |
1998-11-24-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| inventor |
http://rdf.ncbi.nlm.nih.gov/pubchem/patentinventor/MD5_a39483915809bc627276f16f4a703ce8
http://rdf.ncbi.nlm.nih.gov/pubchem/patentinventor/MD5_d3c2fe3a00dc4db845f47468466f1854
http://rdf.ncbi.nlm.nih.gov/pubchem/patentinventor/MD5_d8ee65c9c5a7cb8e1c4fe4b4408210a2 |
| publicationDate |
1998-11-24-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| publicationNumber |
US-5840973-A |
| titleOfInvention |
Process for producing a polyoxyalkylenecarboxylic acid |
| abstract |
A process for producing a polyoxyalkylenecarboxylic acid which comprises: (A) a step of obtaining a salt of a polyoxyalkylenecarboxylic acid by reacting a polyoxyalkylene compound having hydroxyl group at one or both ends of the molecule with a salt of a halogenated acetic acid or a salt of a halogenated propionic acid in an amount of 4 to 50 mol per 1 mol of the polyoxyalkylene compound and an alkali metal hydroxide in an amount of 8 to 70 mol per 1 mol of the polyoxyalkylene compound in the presence of an organic solvent at 80 DEG to 150 DEG C.; (B) a step of converting the obtained salt of a polyoxyalkylenecarboxylic acid into the polyoxyalkylenecarboxylic acid by adjusting pH of the reaction mixture obtained in step (A) to 3 or less by adding an inorganic acid; (C) a step of removing byproducts and the like by washing the obtained solution containing the polyoxyalkylenecarboxylic acid with an aqueous solution of an inorganic salt; and (D) a step of removing the organic solvent and water at a decreased pressure at 50 DEG to 120 DEG C. and removing precipitated salts by filtration. A high purity, high molecular weight polyoxyalkylenecarboxylic acid which contains only small amounts of unreacted starting materials or byproducts can easily be obtained. |
| isCitedBy |
http://rdf.ncbi.nlm.nih.gov/pubchem/patent/US-2008193408-A1
http://rdf.ncbi.nlm.nih.gov/pubchem/patent/US-2010160365-A1
http://rdf.ncbi.nlm.nih.gov/pubchem/patent/US-2003194388-A1
http://rdf.ncbi.nlm.nih.gov/pubchem/patent/US-2011195990-A1
http://rdf.ncbi.nlm.nih.gov/pubchem/patent/US-2010098654-A1
http://rdf.ncbi.nlm.nih.gov/pubchem/patent/US-8048891-B2
http://rdf.ncbi.nlm.nih.gov/pubchem/patent/US-7928095-B2
http://rdf.ncbi.nlm.nih.gov/pubchem/patent/US-7671067-B2
http://rdf.ncbi.nlm.nih.gov/pubchem/patent/US-7208118-B2
http://rdf.ncbi.nlm.nih.gov/pubchem/patent/US-7723351-B2
http://rdf.ncbi.nlm.nih.gov/pubchem/patent/US-2009074706-A1
http://rdf.ncbi.nlm.nih.gov/pubchem/patent/US-2010056555-A1
http://rdf.ncbi.nlm.nih.gov/pubchem/patent/US-2008058364-A1
http://rdf.ncbi.nlm.nih.gov/pubchem/patent/US-2010204261-A1
http://rdf.ncbi.nlm.nih.gov/pubchem/patent/US-8299089-B2
http://rdf.ncbi.nlm.nih.gov/pubchem/patent/US-2005197261-A1
http://rdf.ncbi.nlm.nih.gov/pubchem/patent/US-7462627-B2
http://rdf.ncbi.nlm.nih.gov/pubchem/patent/US-2007197575-A1 |
| priorityDate |
1997-02-19-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| type |
http://data.epo.org/linked-data/def/patent/Publication |