http://rdf.ncbi.nlm.nih.gov/pubchem/patent/GB-750285-A
Outgoing Links
| Predicate | Object |
|---|---|
| assignee | http://rdf.ncbi.nlm.nih.gov/pubchem/patentassignee/MD5_3a5474e273ceda30e08ed3f131162730 |
| classificationCPCInventive | http://rdf.ncbi.nlm.nih.gov/pubchem/patentcpc/C08G8-36 http://rdf.ncbi.nlm.nih.gov/pubchem/patentcpc/C08G8-28 |
| classificationIPCInventive | http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/C08G8-28 http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/C08L61-10 |
| filingDate | 1953-03-26-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| inventor | http://rdf.ncbi.nlm.nih.gov/pubchem/patentinventor/MD5_69f632398e17f0bf0cd639815c45906a http://rdf.ncbi.nlm.nih.gov/pubchem/patentinventor/MD5_2fec695d47c6f75880a7f144936f5e57 http://rdf.ncbi.nlm.nih.gov/pubchem/patentinventor/MD5_22a2ea170bc3da838316c8ca85489f97 |
| publicationDate | 1956-06-13-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| publicationNumber | GB-750285-A |
| titleOfInvention | Improvements relating to modified phenol-aldehyde resins |
| abstract | Oil soluble and oil-reactive phenol-aldehyde resins suitable for use in coating compositions, in the manufacture of linoleum &c., and in the production of sand cores, boat linings, &c, are obtained by condensing a monohydric phenol with an aldehyde in the presence of an acid catalyst, dehydrating the reaction mixture to yield an ungelled product free from aldehyde and heating the dehydrated resin in the presence of a Friedel Crafts halide catalyst and some free monohydric phenol in amount at least 5 per cent by weight of the total phenol employed in the process, to an elevated temperature until there is a substantial drop in the viscosity of the reaction mixture; the phenol used in the first stage must be an alkyl or aryl substituted phenol having at least one unsubstituted hydrogen atom in the positions ortho or para to the phenolic hydroxy group, or if phenol is used in the first stage, then such an aryl or alkyl substituted phenol must be used in the etherification stage. Aldehydes containing up to 4C. atoms in the molecule may be used. 0.6-1.6 mols. aldehyde are employed per mol. phenol and reaction temperatures of about 100 DEG C. are specified. The dehydration may be effected azeotropically in presence of a suitable solvent. Friedel Crafts catalysts specified are boron trifluoride, hydrogen fluoride, aluminium chloride and fluorosulphonic acid. The resins obtained may be further reacted with styrene, coumarone indene or highly conjugated oils, e.g. tung and oiticica oils. The oils reactivity may be destroyed by neutralizing the resin with a base, e.g. sodium hydroxide, triethanolamine, morpholine, hexamine or metallic oxides; gelation of the resins is retarded by addition of hydroxyl containing solvents, e.g. alcohols. In examples: (1) a condensation product containing 15 per cent free cresol is obtained by reacting 100 parts cresylic acid containing 52 per cent m-cresol with 80 parts 40 per cent formalin in the presence of 0.6 parts oxalic acid the resinous product is dehydrated at 125 DEG C. under vacuum in presence of 0.2 per cent boron trifluoride/phenol complex until the viscosity falls; an oil-soluble resin of 90 DEG C. melting point is obtained; (2) the initial resin obtained as in (1) is dehydrated azeotropically in xylol and the dry product refluxed at 110 DEG C. in presence of aluminium chloride dissolved in di-ethyl benzene; (3) fluorosulphonic acid is employed as catalyst; (4) p-octyl phenol is employed in the second stage p-tertiary butyl phenol, p-tertiary amyl phenol and p-phenyl phenol may also be used. |
| priorityDate | 1953-03-26-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| type | http://data.epo.org/linked-data/def/patent/Publication |
Incoming Links
Total number of triples: 66.