| Predicate |
Object |
| assignee |
http://rdf.ncbi.nlm.nih.gov/pubchem/patentassignee/MD5_b8be6a6c990669567cc455d32b00535e |
| classificationCPCAdditional |
http://rdf.ncbi.nlm.nih.gov/pubchem/patentcpc/D21H17-455
http://rdf.ncbi.nlm.nih.gov/pubchem/patentcpc/D21H17-375
http://rdf.ncbi.nlm.nih.gov/pubchem/patentcpc/D21H17-29 |
| classificationCPCInventive |
http://rdf.ncbi.nlm.nih.gov/pubchem/patentcpc/C01B33-141
http://rdf.ncbi.nlm.nih.gov/pubchem/patentcpc/C01B33-146
http://rdf.ncbi.nlm.nih.gov/pubchem/patentcpc/D21H17-68
http://rdf.ncbi.nlm.nih.gov/pubchem/patentcpc/D21H21-10
http://rdf.ncbi.nlm.nih.gov/pubchem/patentcpc/C01B33-143
http://rdf.ncbi.nlm.nih.gov/pubchem/patentcpc/C01B33-1435
http://rdf.ncbi.nlm.nih.gov/pubchem/patentcpc/C01B33-142 |
| classificationIPCAdditional |
http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/D21H17-45
http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/D21H17-37 |
| classificationIPCInventive |
http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/C01B33-146
http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/C01B33-141
http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/C01B33-143
http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/C01B33-14
http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/D21H21-10
http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/D21H17-29
http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/B01J13-00
http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/D21H17-68 |
| filingDate |
2000-04-28-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| grantDate |
2008-02-05-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| inventor |
http://rdf.ncbi.nlm.nih.gov/pubchem/patentinventor/MD5_ba3faea0ea696fd67f2ca3146ac6f326
http://rdf.ncbi.nlm.nih.gov/pubchem/patentinventor/MD5_d28e0bb3e93798c05183fc2bff0bc411
http://rdf.ncbi.nlm.nih.gov/pubchem/patentinventor/MD5_1b616fec66fa886c93bd8156b6071ae9 |
| publicationDate |
2008-02-05-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| publicationNumber |
CA-2371492-C |
| titleOfInvention |
Silica-based sols |
| abstract |
The invention relates to an aqueous sol containing silica-based particles which has an S-value within the range of from 10 to 45 %, a viscosity within the range of from 5 to 40 cP, and a molar ratio of SiO2 to M2O, where M is alkali metal or ammonium, within the range of from 10:1 to 40:1, or a silica content of at least 10 % by weight. The invention further relates to a process for the production of silica-based particles comprising the steps of: (a) acidifying an aqueous silicate solution to a pH of from 1 to 4 to form an acid sol; (b) alkalising the acid sol at an SiO2 content within the range of from 4.5 to 8 % by weight to; (c) allowing particle growth of the alkalised sol for at least minutes, or heat-treating the alkalised sol at a temperature of at least 30 °C; and then (d) alkalising the obtained sol to a pH of at least 10Ø The invention further relates to silica-based particles obtainable by the process, the use of the silica-based particles as drainage and retention aids in the production of paper as well as a process for the production of paper from an aqueous suspension containing cellulosic fibres, and optional filler, in which silica-based particles and at least one charged organic polymer are added to the cellulosic suspension. |
| priorityDate |
1999-05-04-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| type |
http://data.epo.org/linked-data/def/patent/Publication |