http://rdf.ncbi.nlm.nih.gov/pubchem/patent/GB-879524-A
Outgoing Links
| Predicate | Object |
|---|---|
| assignee | http://rdf.ncbi.nlm.nih.gov/pubchem/patentassignee/MD5_4ece3acbea8acdf68fc811ed5070cc5f |
| classificationCPCInventive | http://rdf.ncbi.nlm.nih.gov/pubchem/patentcpc/C08B11-12 |
| classificationIPCInventive | http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/C08B11-12 |
| filingDate | 1959-06-02-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| publicationDate | 1961-10-11-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| publicationNumber | GB-879524-A |
| titleOfInvention | Improvements in or relating to a process of preparing carboxyalkyl cellulose ethers |
| abstract | Carboxyalkyl ethers of cellulose are made by agitating cellulose, a strong alkali, water and an appropriate etherifying agent in any of the following diluents, viz., (a) n-propyl alcohol, (b) isobutyl alcohol, (c) sec. butyl alcohol, (d) dioxane, (e) n-butyl alcohol, (f) n-amyl alcohol or (g) acetone, the ratio by weight of water per part of cellulose falling within the range (a) 1,25-2,75, (b) 0,75-1,5, (c) 0,8-1,2, (d) 1-2, (e) 0,8-2, (f) 0,6-1,6 and (g) 0,9-1,7. Under these conditions the ether remains undissolved in the reaction mixture. The preferred etherifying agent is chloracetic acid, but chloropropionic and chlorobutyric acids, or the corresponding bromine or iodine compounds, may alse be used. Sodium hydroxide is the preferred alkali, but potassium and lithium hydroxides and quaternary ammonium bases are also suitable. The reaction temperature may be 25 DEG -150 DEG C., and the proportions by weight of etherifying agent and alkali may be 0,01-3 parts and 0,1-2 parts, respectively, per part of cellulose. Examples are given Specification 623,276 is referred to |
| priorityDate | 1958-06-12-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| type | http://data.epo.org/linked-data/def/patent/Publication |
Incoming Links
Total number of triples: 44.