| Predicate |
Object |
| assignee |
http://rdf.ncbi.nlm.nih.gov/pubchem/patentassignee/MD5_0efa077d881a96aeb1e29b21ef1bbb58 |
| classificationCPCAdditional |
http://rdf.ncbi.nlm.nih.gov/pubchem/patentcpc/C08F220-56
http://rdf.ncbi.nlm.nih.gov/pubchem/patentcpc/C08F2800-10
http://rdf.ncbi.nlm.nih.gov/pubchem/patentcpc/C08F2810-50 |
| classificationCPCInventive |
http://rdf.ncbi.nlm.nih.gov/pubchem/patentcpc/C08F8-12 |
| classificationIPCInventive |
http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/D21H17-37
http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/C08F8-28
http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/C08C19-00
http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/C08F8-12 |
| filingDate |
1989-09-20-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| grantDate |
1991-01-01-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| inventor |
http://rdf.ncbi.nlm.nih.gov/pubchem/patentinventor/MD5_e31234e8febeb775fe8011bb56a29881
http://rdf.ncbi.nlm.nih.gov/pubchem/patentinventor/MD5_36172170a70335bf2a6bbcab735323fd
http://rdf.ncbi.nlm.nih.gov/pubchem/patentinventor/MD5_b804527a591746305cd8f6fc6740f0e8
http://rdf.ncbi.nlm.nih.gov/pubchem/patentinventor/MD5_0d75f2e15524990258190845b271272c
http://rdf.ncbi.nlm.nih.gov/pubchem/patentinventor/MD5_ca44bccb805219e9a5b33d27270498d5
http://rdf.ncbi.nlm.nih.gov/pubchem/patentinventor/MD5_edd09d98de817ebdd74d535bd9768272 |
| publicationDate |
1991-01-01-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| publicationNumber |
US-4981913-A |
| titleOfInvention |
Bridged, water-soluble copolymers, their preparation and their use |
| abstract |
Bridged, water-soluble copolymers are obtainable by (A) copolymerization of a monomer mixture of (a) from 50 to 99 mol % of acrylamide and/or methacrylamide, (b) from 50 to 1 mol % of a monoethylenically unsaturated monomer containing actual groups and (c) from 0 to 20 mol % of monomers which differ from (a) and (b), in the presence of a polymerization initiator under conditions such that the acetal groups of the monomers (b) undergo virtually no hydrolysis, (B) hydrolysis of the acetal groups of the monomers (b), present as copolymerized units in the copolymers (A), (C) condensation of the copolymers (B) containing aldehyde groups at a pH above 5, at most to a degree such that the resulting condensates are still water-soluble and (D) stopping of the condensation reaction by adding acid until the pH reaches 3 or less, and are used as paper stock additives in papermaking for increasing the wet strength of paper. |
| isCitedBy |
http://rdf.ncbi.nlm.nih.gov/pubchem/patent/US-2009209477-A1 |
| priorityDate |
1988-10-10-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| type |
http://data.epo.org/linked-data/def/patent/Publication |