http://rdf.ncbi.nlm.nih.gov/pubchem/patent/CA-1179460-A
Outgoing Links
| Predicate | Object |
|---|---|
| assignee | http://rdf.ncbi.nlm.nih.gov/pubchem/patentassignee/MD5_13acffa0e4ce30d3be128ccd86b384f6 |
| classificationCPCInventive | http://rdf.ncbi.nlm.nih.gov/pubchem/patentcpc/C08L81-06 http://rdf.ncbi.nlm.nih.gov/pubchem/patentcpc/B01D69-02 http://rdf.ncbi.nlm.nih.gov/pubchem/patentcpc/B01D71-68 |
| classificationIPCInventive | http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/B01D71-68 http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/C08J9-28 http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/C08L81-06 |
| filingDate | 1981-03-10-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| grantDate | 1984-12-18-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| inventor | http://rdf.ncbi.nlm.nih.gov/pubchem/patentinventor/MD5_7beda6f15539affbd190830cade0f065 http://rdf.ncbi.nlm.nih.gov/pubchem/patentinventor/MD5_f664b623e1b38afa89c70aef84f9e28f |
| publicationDate | 1984-12-18-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| publicationNumber | CA-1179460-A |
| titleOfInvention | Semipermeable membranes and process for producing the same |
| abstract | ABSTRACT OF THE DISCLOSURE An improved semipermeable membrane for ultrafiltra-tion with increased water flux and a process for its preparation are disclosed. The semipermeable membrane which comprises dense surface layer of a thickness of about 0.01 to about 1 µ having fine pores of an average pore size of about 5 to 100 .ANG., a comparatively dense porous intermediate layer of a thickness of about 2 to about 30 µ having fine pores of an average pore size of about 100 .ANG. to about 0.2 µ, and a porous substrate layer of a thickness of about 20 to about 500 µ having fine pores of an average pore size of about 0.1 to about 5 µ, wherein said layers are composed of aromatic polysulfone free of a group which dissociates and formed continuously in a membrane body in that order. The semipermeable membrane is produced by a process comprising casting a membrane forming solution having a viscosity at 30°C of about 200 to about 10,000 poises prepared by dissolving in an aprotic polar organic solvent an aromatic polysulfone free of a group which dissociates and a salt of an inorganic acid or of an organic acid into a desired shape, and contacting the solution case with a coagulating solution to coagulate the aromatic polysulfone, wherein the salt is present in the membrane forming solution in the range of about 0.5 to about 15% by weight based on the weight of the solution. |
| priorityDate | 1980-03-10-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| type | http://data.epo.org/linked-data/def/patent/Publication |
Incoming Links
Total number of triples: 49.