http://rdf.ncbi.nlm.nih.gov/pubchem/patent/TW-200540113-A
Outgoing Links
| Predicate | Object |
|---|---|
| assignee | http://rdf.ncbi.nlm.nih.gov/pubchem/patentassignee/MD5_b8be6a6c990669567cc455d32b00535e |
| classificationCPCAdditional | http://rdf.ncbi.nlm.nih.gov/pubchem/patentcpc/D21H21-10 |
| classificationCPCInventive | http://rdf.ncbi.nlm.nih.gov/pubchem/patentcpc/C01B33-1435 http://rdf.ncbi.nlm.nih.gov/pubchem/patentcpc/C01B33-14 http://rdf.ncbi.nlm.nih.gov/pubchem/patentcpc/D21H17-68 http://rdf.ncbi.nlm.nih.gov/pubchem/patentcpc/C01B33-143 http://rdf.ncbi.nlm.nih.gov/pubchem/patentcpc/B01F23-50 http://rdf.ncbi.nlm.nih.gov/pubchem/patentcpc/D21H21-10 |
| classificationIPCAdditional | http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/D21H21-10 |
| classificationIPCInventive | http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/C01B33-143 http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/D21H17-68 http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/C01B33-14 |
| filingDate | 2005-04-06-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| inventor | http://rdf.ncbi.nlm.nih.gov/pubchem/patentinventor/MD5_d254b0814283fea70a49f162712c14d5 http://rdf.ncbi.nlm.nih.gov/pubchem/patentinventor/MD5_85d2509932750bd6a3ede5b21cf54182 |
| publicationDate | 2005-12-16-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| publicationNumber | TW-200540113-A |
| titleOfInvention | Silica-based sols and their production and use |
| abstract | The present invention relates to a process for producing an aqueous silica-based sol which comprises: (a) providing a cationic ion exchange resin having at least part of its ion exchange capacity in hydrogen form; (b) bringing said ion exchange resin in contact with an aqueous alkali metal silicate to form an aqueous slurry; (c) stirring said aqueous slurry until the pH of the aqueous phase is in the range of from 5.0 to 11.5; and/or alternatively, stirring said aqueous slurry to allow particle aggregation or microgel formation corresponding to an S value up to 45%, and pH of the aqueous phase of at least 5.0; (d) adjusting the pH of said aqueous phase to above 9.0 using one or more materials comprising at least one aluminium compound; and (e) separating said ion exchange resin from the aqueous phase after step (c) or after step (d), and optionally (f) providing an aqueous silica-based sol having an S value between 10 and 50%. The invention also relates to a silica-based sol having an S value within the range of from 15 to 25%, mole ratio Si:Al in the range of from 20:1 to 50:1, mole ratio Si:X, where X=alkali metal, in the range of from 5:1 to 17:1, SiO2 content of at least 5% by weight and containing silica-based particles having a specific surface of at least 300 m<SP>2</SP>/g. The invention further relates to process for producing paper which comprises (i) providing an aqueous suspension comprising cellulosic fibres; (j) adding to the suspension one or more drainage and retention aids comprising a silica-based sol according to the invention; and (k)dewatering the obtained suspension to provide a sheet or web of paper. |
| priorityDate | 2004-04-07-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| type | http://data.epo.org/linked-data/def/patent/Publication |
Incoming Links
Total number of triples: 66.