http://rdf.ncbi.nlm.nih.gov/pubchem/patent/GB-763439-A
Outgoing Links
| Predicate | Object |
|---|---|
| assignee | http://rdf.ncbi.nlm.nih.gov/pubchem/patentassignee/MD5_5528d8d64c9da539b3fa8028a22bede6 |
| classificationCPCInventive | http://rdf.ncbi.nlm.nih.gov/pubchem/patentcpc/B23K35-3615 |
| classificationIPCInventive | http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/B23K35-36 |
| filingDate | 1952-12-31-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| publicationDate | 1956-12-12-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| publicationNumber | GB-763439-A |
| titleOfInvention | Improvements in or relating to soldering of metals |
| abstract | Pyrazoline hydrohalides for use in solder fluxes (see Group VI) are prepared by reacting an aldehyde or ketone with a hydrazine hydrohalide or with a hydrazine and a hydrogen halide. The carbonyl compound may be reacted with the hydrazine, used for example in the anhydrous state or as an aqueous solution of the hydrate, and thereafter with the hydrogen halide in aqueous or gaseous form. The carbonyl compound may be reacted with the hydrazine hydrohalide by admixture at ordinary temperatures or with application of controlled heat. An inert solvent is used when the reactants are solid or viscous. The products are recovered by crystallization and may be recrystallized, e.g. from methanol. Examples describe the preparation of the hydrochloride and hydrobromide of 3,5,5-trimethyl pyrazoline from acetone and the appropriate hydrohalide of hydrazine and of a pyrazoline hydrochloride from methyl ethyl ketone and hydrazine hydrochloride. Other reactants mentioned are di-acetone alcohol, di-ethyl ketone, methyl vinyl ketone, mesityl oxide, methyl phenyl ketone, acetaldehyde, propionaldehyde, acrolein and crotonaldehyde and dimethyl hydrazine, phenyl hydrazine and hydroxyethyl hydrazine and their hydrohalides including the hydrofluorides.ALSO:A solder flux comprises a solution of a pyrazoline hydrohalide obtainable by the reaction of an aldehyde or ketone with a hydrazine hydrohalide or with a hydrazine and a hydrohalide (see Group IV(b)). The fluxes are particularly applicable to the soldering of a metal whose oxide can be reduced by the hydrazine e.g. copper, brass and aluminium and its alloys including the soldering of aluminium and its alloys with copper or brass using cadmium- or tin-zinc solders. The preferred fluxes are aqueous solutions containing for example 2-50 per cent by weight of the pyrazoline hydrohalide. However, an alcohol such as methanol or acetone may be used as the solvent. The fluxes may contain additional materials such as wetting agents and, as an extender, ammonium chloride. Specified fluxes are aqueous solutions of 3, 5, 5 - trimethyl pyrazoline hydrochloride or the corresponding hydrobromide, obtained by reaction of acetone with the appropriate hydrohalide of hydrazine and the pyrazoline compound prepared from methyl ethyl ketone and hydrazine hydrochloride and examples illustrate their spread action on aluminium. Other starting materials mentioned are di-acetone alcohol, di-ethyl ketone, methyl vinyl ketone, mesityl oxide, methyl phenyl ketone, acetaldehyde, propionaldehyde, acrolein and crotonaldehyde and dimethyl hydrazine, phenyl hydrazine, hydroxy ethyl hydrazine and their hydrohalides including the hydro fluorides. |
| priorityDate | 1951-12-31-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| type | http://data.epo.org/linked-data/def/patent/Publication |
Incoming Links
Total number of triples: 68.