| Predicate |
Object |
| assignee |
http://rdf.ncbi.nlm.nih.gov/pubchem/patentassignee/MD5_4976a2965a6f1f78fd131ea1cd31d5ef |
| classificationCPCInventive |
http://rdf.ncbi.nlm.nih.gov/pubchem/patentcpc/A01N59-12 |
| classificationIPCInventive |
http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/A01N59-12 |
| filingDate |
1986-04-09-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| grantDate |
1987-08-04-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| inventor |
http://rdf.ncbi.nlm.nih.gov/pubchem/patentinventor/MD5_233b64522f387b9805cd47780e1cdf13 |
| publicationDate |
1987-08-04-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| publicationNumber |
US-4684519-A |
| titleOfInvention |
Method of preparing a polyvinylpyrrolidone-halogen complex of improved stability |
| abstract |
The invention relates to the process for making a highly stable polyvinylpyrrolidone-halogen complex by forming a reaction solution in a diffusion zone containing a 3 to 9 percent aqueous solution of polyvinylpyrrolidone and halogen dissolved in an alcohol solution wherein the concentration of alcohol is not less than 40% of the total solutions and wherein a portion of the halogen requirement, up to 35%, may be in the form of hydrogen halide or a salt thereof; reacting the polypyrrolidone and halogen components and forming a water/alcohol azeotrope simultaneously with the corresponding polyvinylpyrrolidone-halogen complex; subjecting the reacted mixture to azeotropic distillation to remove an aqueous alcohol distillate; recycling the distillate to the halogen solubilizing or diffusion zone and subjecting the remaining liquid product solution, containing not more than about 35% solids, to spray drying to recover the polyvinylpyrrolidone/halogen product in the form of a particulate solid wherein each particle is of a uniform brownish yellow color throughout. |
| isCitedBy |
http://rdf.ncbi.nlm.nih.gov/pubchem/patent/US-5674436-A
http://rdf.ncbi.nlm.nih.gov/pubchem/patent/US-5478571-A
http://rdf.ncbi.nlm.nih.gov/pubchem/patent/US-5002763-A
http://rdf.ncbi.nlm.nih.gov/pubchem/patent/EA-007544-B1
http://rdf.ncbi.nlm.nih.gov/pubchem/patent/US-9730892-B2
http://rdf.ncbi.nlm.nih.gov/pubchem/patent/US-5019380-A
http://rdf.ncbi.nlm.nih.gov/pubchem/patent/EP-0402369-A1
http://rdf.ncbi.nlm.nih.gov/pubchem/patent/US-6319909-B1
http://rdf.ncbi.nlm.nih.gov/pubchem/patent/US-9737482-B2
http://rdf.ncbi.nlm.nih.gov/pubchem/patent/US-4851543-A
http://rdf.ncbi.nlm.nih.gov/pubchem/patent/EP-0402369-A4
http://rdf.ncbi.nlm.nih.gov/pubchem/patent/US-9737483-B2
http://rdf.ncbi.nlm.nih.gov/pubchem/patent/WO-2021173438-A1
http://rdf.ncbi.nlm.nih.gov/pubchem/patent/US-9724302-B2
http://rdf.ncbi.nlm.nih.gov/pubchem/patent/US-9808424-B2
http://rdf.ncbi.nlm.nih.gov/pubchem/patent/US-10045941-B2
http://rdf.ncbi.nlm.nih.gov/pubchem/patent/US-5616348-A
http://rdf.ncbi.nlm.nih.gov/pubchem/patent/US-2009124775-A1
http://rdf.ncbi.nlm.nih.gov/pubchem/patent/US-10398648-B2
http://rdf.ncbi.nlm.nih.gov/pubchem/patent/EP-3871503-A1
http://rdf.ncbi.nlm.nih.gov/pubchem/patent/WO-9847373-A1
http://rdf.ncbi.nlm.nih.gov/pubchem/patent/US-9757336-B2 |
| priorityDate |
1986-04-09-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| type |
http://data.epo.org/linked-data/def/patent/Publication |