http://rdf.ncbi.nlm.nih.gov/pubchem/patent/DE-2540276-A1
Outgoing Links
| Predicate | Object |
|---|---|
| assignee | http://rdf.ncbi.nlm.nih.gov/pubchem/patentassignee/MD5_0efa077d881a96aeb1e29b21ef1bbb58 |
| classificationCPCInventive | http://rdf.ncbi.nlm.nih.gov/pubchem/patentcpc/C08F10-00 |
| classificationIPCInventive | http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/C08F10-00 |
| filingDate | 1975-09-10-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| inventor | http://rdf.ncbi.nlm.nih.gov/pubchem/patentinventor/MD5_bbf7d2c2677a5e137475fab4ff4c21ff http://rdf.ncbi.nlm.nih.gov/pubchem/patentinventor/MD5_139ddaf1ca6199d76958ddafe29953d3 http://rdf.ncbi.nlm.nih.gov/pubchem/patentinventor/MD5_4ccfed81fe8d5c96cc46d6bcc6b5bf12 http://rdf.ncbi.nlm.nih.gov/pubchem/patentinventor/MD5_511263afd29dbfdb2ba76a063b41d2e3 |
| publicationDate | 1977-03-24-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| publicationNumber | DE-2540276-A1 |
| titleOfInvention | PROCESS FOR PREPARING OLEFINE POLYMERIZES |
| abstract | Olefin polymers are prepd. by polymerising 2-8C monoolefins at 60-100 degrees C and olefin pressures of 0.5-40 bars using a catalyst obtd. by (A) preparing a silicic acid-xerogel by (i) extracting >=60% (pref. >=90%) of the water contained in a silicic acid hydrogel contg. 10-25% (esp. 14-20%) solids (calc. as SiO2) with a 1-4C alcohol and/or 3-5C alkanone; (ii) drying the gel from (ii) at 180 degrees C/10 torr/30 mins. to contact wt. (xerogel formation); (iii) comminuting the xerogel to a dia. of 20-2000 (pref. 40-300) ; (B) admixing the xerogel with solid, finely divided chromium trioxide at 100-300 degrees C/0.001-250 torr until the xerogel takes up 0.1-10% (calc. on the xerogel and as Cr) chromium trioxide; (C) maintaining the prod. from (B) in a gas stream free from water and contg. >10 vol. % O2 at 400-1000 degrees C/10-100 mins. The hydrogel used in (A) comprises spherical, particles at dia. 1-8 mm., pref. 2-6mm. and is prepd. by (i) introducing a soln. of Na or K silicate along the length and also tangentially to a spiralling stream of an aq. inorganic acid; (ii) spraying the resulting silicic acid hydrogel into a gaseous medium dropwise; (iii) allowing the sprayed hydrogel to solidify in the gaseous medium; (iv) washing the resulting spherical hydrogel without prior ageing to remove salts. Used esp. for ethylene polymerisation. The catalyst gives high productivity, and the catalyst content of the polymer is so small that it need not be removed. |
| isCitedBy | http://rdf.ncbi.nlm.nih.gov/pubchem/patent/EP-0640625-A3 http://rdf.ncbi.nlm.nih.gov/pubchem/patent/EP-0640625-A2 |
| priorityDate | 1975-09-10-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| type | http://data.epo.org/linked-data/def/patent/Publication |
Incoming Links
Total number of triples: 40.