http://rdf.ncbi.nlm.nih.gov/pubchem/patent/GB-532695-A
Outgoing Links
| Predicate | Object |
|---|---|
| assignee | http://rdf.ncbi.nlm.nih.gov/pubchem/patentassignee/MD5_6108c9a7f7a472c2db8923daca0ec8d6 |
| classificationCPCAdditional | http://rdf.ncbi.nlm.nih.gov/pubchem/patentcpc/C08J2301-00 |
| classificationCPCInventive | http://rdf.ncbi.nlm.nih.gov/pubchem/patentcpc/C08J9-00 |
| classificationIPCInventive | http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/C08J9-00 |
| filingDate | 1939-07-26-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| publicationDate | 1941-01-29-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| publicationNumber | GB-532695-A |
| titleOfInvention | Improvements in or relating to organic derivatives of cellulose |
| abstract | 532,695. Cellulose derivatives and articles made thereof. BRITISH CELANESE, Ltd. July 26, 1939, Nos. 21704 and 21705. Convention dates, July 26, 1938 and Aug. 24, 1938. [Class 2 (ii)] Porous organic derivatives are prepared by dissolving the cellulose derivative under the action of heat and pressure in a mixture of a volatile solvent for the cellulose derivative and a liquid that at normal temperature and pressures is a non-solvent, such mixture having little or no solvent action at normal temperatures and pressures, and then releasing the pressure quickly to allow the volatile solvent to volatilize. Particles or flakes of cellulose derivative that are readily soluble may be obtained by grinding the porous mass after drying. Suitable cellulose derivatives include cellulose acetate, formate, propionate and butyrates and ethyl, methyl and benzyl cellulose ; suitable solvents include acetone, methanol, ethanol, ethylene dichloride, and diacetone ; suitable non-solvent liquids include water, kerosene and naphtha. Fillers, such as cotton, linen, threads, fibres, scrap fabric of regenerated cellulose, glass wool, spun rock, asbestos, cork, diatomaceous earth, mica and sawdust, fire retardants, stiffening materials, ground glass, fullers earth, plasticizers, dyes, lakes and fire retardants may be added to the cellulose derivative before solution. The products may be formed into sponges, porous discs, mats, bars, sheet or cakes, and used as insulating materials in refrigerators, aeroplanes, automobiles, and houses or as filters. Products derived from cellulose esters may be modified by saponification such as in aqueous ammonia, caustic soda or a quaternary amine to yield sponges of regenerated cellulose having absorbent properties. The pressure used in the obtaining of the solution may be obtained by pumping air into an autoclave followed by releasing the air pressure or releasing the material into the air or into a shaping tube ; alternatively, pressure and release may be obtained by moving a piston in a cylinder. In an example, cellulose acetate waste yarn is soaked in a mixture of acetone and water, the mass subjected to heat and pressure and the pressure quickly released on the solution, so as to obtain a porous cellulose acetate which may be saponified in aqueous trimethyl benzyl ammonium hydroxide or which, after drying, may be ground to yield a flaky cellulose acetate. |
| priorityDate | 1938-07-26-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| type | http://data.epo.org/linked-data/def/patent/Publication |
Incoming Links
Total number of triples: 38.