| Predicate |
Object |
| assignee |
http://rdf.ncbi.nlm.nih.gov/pubchem/patentassignee/MD5_3e67834d3ee31bc1fca6f2541c1b5c57 |
| classificationCPCAdditional |
http://rdf.ncbi.nlm.nih.gov/pubchem/patentcpc/A61Q5-06
http://rdf.ncbi.nlm.nih.gov/pubchem/patentcpc/A61Q5-04
http://rdf.ncbi.nlm.nih.gov/pubchem/patentcpc/A61Q5-12
http://rdf.ncbi.nlm.nih.gov/pubchem/patentcpc/A61Q5-02 |
| classificationCPCInventive |
http://rdf.ncbi.nlm.nih.gov/pubchem/patentcpc/C08F226-06
http://rdf.ncbi.nlm.nih.gov/pubchem/patentcpc/A61Q19-00
http://rdf.ncbi.nlm.nih.gov/pubchem/patentcpc/A61K8-8182
http://rdf.ncbi.nlm.nih.gov/pubchem/patentcpc/A61K8-817 |
| classificationIPCInventive |
http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/C08F226-06
http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/C08F26-06
http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/A61K8-81
http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/C08F226-10
http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/A61Q5-00
http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/A61Q5-06
http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/A61Q5-04
http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/A61Q5-02
http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/A61Q19-00
http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/C08F26-10
http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/A61Q5-12
http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/A61K8-00
http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/C08F220-60
http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/C08F2-10
http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/C08F20-52 |
| filingDate |
1990-04-09-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| inventor |
http://rdf.ncbi.nlm.nih.gov/pubchem/patentinventor/MD5_006cf41c22db8710626848bebb8d4793 |
| publicationDate |
1990-11-15-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| publicationNumber |
WO-9013577-A1 |
| titleOfInvention |
Process for preparing substantially pure high molecular weight vinyl lactam-quaternized acrylamide copolymers |
| abstract |
The invention relates to the production of high molecular weight vinyl lactam-quaternized amino acrylamide copolymers having less than 0.1 % residual unreacted monomer, which comprises: subjectinmg the monomers to solution polymerization in the presence of a buffering agent having chelating properties for complexing with traces of heavy metals; controlling the pH of the polymerization to a level above 5.5 while continuously ebulating nitrogen gas through the system during reaction and incrementally adding a free radical initiator in 2 to 4 stages during the conversion to copolymer. The invention also relates to the substantially pure vinyl lactam-acrylamide copolymer having a Brookfield viscosity of at least 75,000 cps. and a residual monomer content below 0.5 wt. %, for example less than 1,000 ppm. |
| priorityDate |
1989-05-01-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| type |
http://data.epo.org/linked-data/def/patent/Publication |