http://rdf.ncbi.nlm.nih.gov/pubchem/patent/GB-702142-A
Outgoing Links
| Predicate | Object |
|---|---|
| assignee | http://rdf.ncbi.nlm.nih.gov/pubchem/patentassignee/MD5_5c24684033fba97d1ad845ce453a57e3 |
| classificationCPCInventive | http://rdf.ncbi.nlm.nih.gov/pubchem/patentcpc/C08G8-10 http://rdf.ncbi.nlm.nih.gov/pubchem/patentcpc/C08G8-12 |
| classificationIPCInventive | http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/C08G8-00 |
| filingDate | 1950-10-11-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| publicationDate | 1954-01-13-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| publicationNumber | GB-702142-A |
| titleOfInvention | Cold-hardening compositions containing phenol-formaldehyde condensation products, and a process for making such compositions |
| abstract | Compositions capable of hardening rapidly in the cold comprise furfural, a liquid condensation product obtained by condensing formaldehyde with at least one mononuclear monohydric phenol in an alkaline medium, at least one hardening agent therefor and at least one filler. Hardeners specified are acid or neutral persulphates, titanium sulphate, neutral metal dioxides such as lead and manganese dioxides, aromatic sulphochlorides such as para-toluene-and b -naphthalene-sulphochlorides, aralkyl chlorides and sulphates such as dichloromethylmeta-xylol and dibenzyl sulphate, and naphthalene disulphonic acids, such as 1:5-naphthalene disulphonic acid. Fillers specified are quartz powder, barium sulphate, natural or artificial graphite, silicon and silicon compounds, such as silicon carbide. Besides furfurol other substances capable of increasing the chemical resistance of the resin mixture may be added, e.g. aliphatic esters of inorganic acids such as diethyl,-dipropyl-sulphates, triethylphosphate, dichloropropanol, epichlorhydrin, dichlorhydrin and ethylenechlorhydrin, chlorinated aliphatic alcohols and aldehydes such as ortho-chlorobenzaldehyde, b -dichloro-propionaldehyde hydrate and chloralhydrate; these substances may be added alone or in admixture. The mixture may be made by mixing the hardener(s) with the inert filler(s) and mixing the resulting powder with the liquid condensate and furfurol. If desired, the mixture of furfurol and the liquid condensate may be heated before use, by refluxing for 1-2 hours. The composition may be made up into two separately packed parts to be mixed prior to use, one part consisting of a powder containing the filler and hardener and the other part consisting of a liquid composed of the condensate and furfurol. The liquid condensate is preferably made from formaldehyde and phenol or isomeric cresols or xylenols or any mixture thereof, in the molecular proportions of 1:1 to 1.8:1, by introducing the phenol into caustic soda solution at 60-70 DEG C., cooling to 35-40 DEG C. and adding formalin thereto. After maintaining the mixture at this temperature for 2-3 days, it is neutralised with hydrochloric acid while cooling with ice, the resin layer being separated, washed, and its pH adjusted to 7-8 by addition of caustic soda. Examples are given. |
| priorityDate | 1949-10-17-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| type | http://data.epo.org/linked-data/def/patent/Publication |
Incoming Links
Total number of triples: 54.