http://rdf.ncbi.nlm.nih.gov/pubchem/patent/GB-748913-A
Outgoing Links
| Predicate | Object |
|---|---|
| assignee | http://rdf.ncbi.nlm.nih.gov/pubchem/patentassignee/MD5_1e70c0aeade92d7571d955d3b90ea06e |
| classificationCPCAdditional | http://rdf.ncbi.nlm.nih.gov/pubchem/patentcpc/C08J2361-24 http://rdf.ncbi.nlm.nih.gov/pubchem/patentcpc/C08J2471-00 |
| classificationCPCInventive | http://rdf.ncbi.nlm.nih.gov/pubchem/patentcpc/C08J9-0061 |
| classificationIPCInventive | http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/C08J9-00 |
| filingDate | 1953-09-25-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| publicationDate | 1956-05-16-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| publicationNumber | GB-748913-A |
| titleOfInvention | Process for preparing urea-formaldehyde resin solid foams |
| abstract | A urea-formaldehyde resin foam is made by (1) emulsifying a low boiling organic water-insoluble liquid with an aqueous solution of a urea-formaldehyde resin having a viscosity of 200-10,000 centipoises in presence of an emulsifying agent; (2) vaporizing the liquid by raising the temperature or reducing the pressure, and (3) curing the resultant mixture made up of cells containing the said vapours by maintaining the mixture at a temperature above the boiling point of the organic liquid but below 115 DEG C. in presence of an acidic cure catalyst and 10-35 per cent based on the weight of the resin of a polyethylene glycol having 3-50 oxyethylene groups per molecule. The mol. ratio of formaldehyde : urea in the resin is preferably 1.4 : 1 to 2.5 : 1. Specified are: organic liquids-propane, ethyl chloride, a butene, butane, dichlorotetrafluoroethane and trichloromonofluoromethane; hardening catalysts-phosphoric acid, formic acid and sulphur dioxide; emulsifying agents-dioctyl esters of sodium sulfo-succinic acids, sulphates of fatty acid monoglycerides, fatty alcohol sulphates, sodium alky aryl sulphonates, sorbitan monolaurates and polyoxyethylene ethers of palmitic acid. In an example, a mixture of an unpolymerized condensate of 5 mols of formaldehyde and 1 mol. of urea and polyethylene glycol was acidified to pH 2.2 with hydrochloric acid and allowed to stand overnight. The solution was then adjusted to pH 8.0 with sodium hydroxide, urea was added to give a molar F/U ratio of 2.3 and the mixture heated to 50 DEG C. The pH was then adjusted to 5.2 with hydrochloric acid, the mixture heated to 85 DEG C., then cooled and adjusted to pH 8.0 with sodium hydroxide. Urea was then added to give a F/U ratio of 1.8, dibutyl phenyl phenol sodium sulphonate added and the mixture stored overnight. The resultant resin solution was then cooled to - 5 DEG C., liquid butane added, and the mixture allowed to warm until expansion started. Phosphoric acid was then added and the mixture poured into a tray and allowed to rise and set at room temperature. |
| isCitedBy | http://rdf.ncbi.nlm.nih.gov/pubchem/patent/DE-1224032-B http://rdf.ncbi.nlm.nih.gov/pubchem/patent/DE-1153162-B http://rdf.ncbi.nlm.nih.gov/pubchem/patent/US-4129547-A http://rdf.ncbi.nlm.nih.gov/pubchem/patent/EP-0002585-A1 |
| priorityDate | 1952-11-22-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| type | http://data.epo.org/linked-data/def/patent/Publication |
Incoming Links
Total number of triples: 54.