http://rdf.ncbi.nlm.nih.gov/pubchem/patent/CA-1141558-A
Outgoing Links
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| classificationIPCAdditional | http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/C02F1-68 http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/C02F1-50 |
| classificationIPCInventive | http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/A01N57-10 http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/C05G3-00 http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/A01N55-04 http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/A01M1-20 http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/A01N25-34 http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/A01N25-10 http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/A01N47-22 http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/C05D9-02 http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/C08J9-26 |
| filingDate | 1980-06-06-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| grantDate | 1983-02-22-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| inventor | http://rdf.ncbi.nlm.nih.gov/pubchem/patentinventor/MD5_5ed6ceb48bc27c934e8237499098f583 |
| publicationDate | 1983-02-22-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| publicationNumber | CA-1141558-A |
| titleOfInvention | Controlled release of trace nutrients |
| abstract | ABSTRACT OF THE DISCLOSURE Compositions of an a method for pre-paring polymeric formulations that gradually, con-tinuously and uniformly release various compounds over a long period of time in ionic form that are well recognized as essential to the growth of agri-cultural commodities. The compounds, such as inor-ganic salts of varying water solubilities, are mono-lithically incorporated in a thermoplastic polymeric matrix usually of two thermoplastic polymers, for example, a copolymer of poly(ethylene-vinyl acetate) or a copolymer of ethylene and propylene. Release is generally conditioned upon the presence of moisture and is proportional to the moisture content of soil treated with the subject invention. Release rate is tailored to a given desirable condition by regulation of the free volume and/or polarity within the polymer matrix and through dispenser geometry. Free volume is maintained at the level conducive to agent release such as through the use of free volume modifying secondary thermoplastic additives such as low density polyethylene; and porosity is controlled through the use of porosity enhancing agents appropriately termed porosigens. Said porosigens can be the low or moderate soluble salts such as the carbonates, bicarbonates, sulfates, phosphates, nitrates, etc.; of the alkali metals, the alkaline earths, or ammonium. Upon exposure to moisture, water ingress into the dispens-ing pellet removes said porosigen through dissolution. processes thus creating a porous network permitting water contact with the incorporated nutrient mole-cules and their gradual egress in said water over a period of time such as for about a couple months to four years, or longer. |
| isCitedBy | http://rdf.ncbi.nlm.nih.gov/pubchem/patent/US-5435821-A |
| priorityDate | 1979-06-22-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| type | http://data.epo.org/linked-data/def/patent/Publication |
Incoming Links
Total number of triples: 286.