http://rdf.ncbi.nlm.nih.gov/pubchem/patent/CA-2383803-A1
Outgoing Links
| Predicate | Object |
|---|---|
| assignee | http://rdf.ncbi.nlm.nih.gov/pubchem/patentassignee/MD5_f000fefffa3808853388291a30640521 |
| classificationCPCInventive | http://rdf.ncbi.nlm.nih.gov/pubchem/patentcpc/C08B15-04 http://rdf.ncbi.nlm.nih.gov/pubchem/patentcpc/D21C9-002 http://rdf.ncbi.nlm.nih.gov/pubchem/patentcpc/D21H11-20 |
| classificationIPCInventive | http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/D21H13-04 http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/D21H11-20 http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/C08B15-04 http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/D21C9-00 |
| filingDate | 2002-04-26-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| inventor | http://rdf.ncbi.nlm.nih.gov/pubchem/patentinventor/MD5_1a5e19196295b67b30b3439e6778c1bf http://rdf.ncbi.nlm.nih.gov/pubchem/patentinventor/MD5_4d07ea02b755e664e6997433469d0dd4 http://rdf.ncbi.nlm.nih.gov/pubchem/patentinventor/MD5_bfe1dc955bdc5c428b4487a8ec9f7854 |
| publicationDate | 2002-12-06-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| publicationNumber | CA-2383803-A1 |
| titleOfInvention | Method for preparation of stabilized carboxylated cellulose |
| abstract | The invention is directed to a method of making a heat and light stable carboxylated cellulose fiber whose fiber strength and degree of polymerization is not significantly sacrificed. The method involves the use of a catalytic amount of a hin-dered cyclic oxammonium salt as a primary oxidant and a peracid and halide salt as a secondary oxidant in an aqueous environment. The oxammonium compounds may be formed in situ from their corresponding amine, hydroxylamine, and nitroxyl com-pounds. The oxidized cellulose is then stabilized against D.P. loss and color reversion by further treatment with an oxidant such as sodium chlorite, a chlorine diox-ide/hydrogen peroxide mixture, or a peracid under acidic conditions. Alternatively it may be treated with a reducing agent such as sodium borohydride. The method results in a high percentage of carboxyl groups located at the fiber surface. The product is es-pecially useful as a papermaking fiber where it contributes strength and has a higher attraction for cationic additives. The product is also useful as an additive to recycled fiber to increase strength. The method can be used to improve properties of either vir-gin or recycled fiber. It does not require high .alpha.-cellulose fiber but is suitable for regu-lar market pulps. |
| priorityDate | 2001-06-06-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| type | http://data.epo.org/linked-data/def/patent/Publication |
Incoming Links
Total number of triples: 127.