Cleaning compositions for solid surfaces – auxiliary compositions – Cleaning compositions or processes of preparing – For cleaning a specific substrate or removing a specific...
Patent
1998-01-27
2000-12-19
Gupta, Yogendra
Cleaning compositions for solid surfaces, auxiliary compositions
Cleaning compositions or processes of preparing
For cleaning a specific substrate or removing a specific...
510175, 510176, 510407, 510505, C11D 322, C23G 322
Patent
active
061627798
DESCRIPTION:
BRIEF SUMMARY
The present invention relates to a composition for cleaning solid surfaces, under cold conditions, in a non-aqueous medium based on a mixture of alkanes or cycloalkanes and on at least one organic compound comprising at least one ketone function.
This composition can be used in particular for applications of degreasing solid surfaces such as metal components, cement, ceramics, glass and synthetic materials which have been soiled by machine oils or greases, and/or for their temporary protection.
This composition can also be used for defluxing printed circuits. This defluxing operation consists in removing the soldering flux.
Hitherto, hydrocarbon solvents were used for these various operations, and mainly chlorinated solvents such as, in particular, 1,1,1-trichloroethane known in the field under the name T111, as well as chlorofluoroalkanes such as 1,1,2-trichloro-1,2,2-trifluoroethane, known in the field under the name F113.
However, these chloro and fluorochloro compounds are suspected of being responsible for the decrease in the stratospheric ozone layer which provides protection against certain types of radiation.
Following the Montreal Protocol which resulted from recent international discussions on the environment, these chloro or fluorochloro compounds will, before long, have to be replaced by substitutes having little or no destructive effect on stratouipheric ozone.
British patent application GB 2,175,004 proposes a cleaning composition for removing greases from metal or plastic surfaces, comprising from 85 to 97 parts by weight of non-aromatic hydrocarbons containing aliphatic and/or cycloaliphatic compounds and from 3 to 15 parts by weight of aromatic compounds containing at least one alkyl group having from 8 to 18 carbon atoms.
However, this composition has the drawback of containing non-negligible amounts of aromatic compounds.
On account, in particular, of their relatively irritant nature, the use of such compounds in degreasing applications under cold conditions is becoming increasingly limited, or even prohibited.
A composition for cleaning solid surfaces under cold conditions, in non-aqueous medium, has now been found, this composition consisting essentially of at least one mixture of alkanes or a mixture of cycloalkanes and of at least one organic compound comprising at least one ketone function, characterized in that the mixture of alkanes or the mixture of cycloalkanes and the organic compound comprising at least one ketone function have a flashpoint above or equal to 40.degree. C. and below 55.degree. C., and that the composition has a flashpoint above or equal to 40.degree. C. and below 55.degree. C., preferably between 40.degree. C. and 50.degree. C., measured according to ASTM standard D56-70.
By way of example of a mixture of alkanes which can be used according to the present invention, mention may be made of petroleum fractions having a carbon number ranging from 8 to 12 and preferably ranging from 9 to 11.
Among these petroleum fractions, the invention relates most particularly to those which have a flashpoint above or equal to 40.degree. C. and preferably below 55.degree. C. and which have a distillation range of from 150.degree. C. to 195.degree. C. and preferably of from 155.degree. C. to 185.degree. C.
Among these petroleum fractions, it is preferred to use those which contain virtually no aromatic compounds.
As illustrations of such petroleum fractions, mention may be made of the isoparaffinic solvents sold by the company Total under the names Isane IP 155 (flashpoint of 41.degree. C.) and Isane IP 165 (flashpoint of 48.degree. C.), and the petroleum fraction Isopar G marketed by the company Exxon Chemical (flashpoint of 42.degree. C.).
It would not be departing from the scope of the invention if a virtually pure paraffin or isoparaffin was used, provided that its flashpoint, measured according to ASTM standard D56-70, is above or equal to 40.degree. C. and below 55.degree. C.
An example of such a paraffin which may be mentioned is the n-C.sub.10 paraffin marketed by the com
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Martin Jean-Jacques
Michaud Pascal
Elf Atochem S.A.
Gupta Yogendra
Webb Gregory E.
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