Cleaning compositions for solid surfaces – auxiliary compositions – Cleaning compositions or processes of preparing – For cleaning a specific substrate or removing a specific...
Patent
1995-06-09
1997-07-15
McGinty, Douglas J.
Cleaning compositions for solid surfaces, auxiliary compositions
Cleaning compositions or processes of preparing
For cleaning a specific substrate or removing a specific...
510175, 510163, 510256, 510273, 510365, 510410, 510411, 510412, 252364, 134 40, C11D 730, C11D 726, C11D 750, B08B 308
Patent
active
056483252
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The present invention relates to mixed solvent compositions used for removing soils such as flux or oil or water deposited on an object such as a printed circuit board, an electronic part such as an IC, a precision machinery component or a glass substrate.
BACKGROUND ART
To remove flux, various oils or water deposited on an object, 1,1,2-trichloro-1,2,2-trifluoroethane (hereinafter referred to as R113), which is nonflammable, low toxic and excellent in stability, or a mixed solvent composition consisting of R113 and a solvent miscible with R113 is widely used. Since R113 has such characteristics that it has little effect on a base material of an object such as a metal, a plastic or an elastomer and selectively dissolves various soils, it has been the most suitable for cleaning various precision machinery components, various electronic parts made of e.g. a metal, a plastic or an elastomer, a printed circuit board on which these electronic parts are mounted, or an optical device. In spite of various advantages of conventionally used R113, its production and consumption are regulated, because it has such a long life time in the troposphere by virtue of its extreme chemical stability that it can diffuse to the stratosphere, where it is decomposed by an ultraviolet ray, producing chlorine radicals and the chlorine radical causes a chain reaction with stratospheric ozone to deplete the ozone layer.
For this reason, alternative solvents to R113 which do not cause depletion of the ozone layer are widely being researched. As alternative solvents, 2,2-dichloro-1,1,1-trifluoroethane, 1,1-dichloro-l-fluoroethane, 3,3-dichloro-1,1,1,2,2-pentafluoropropane and 1,3-dichloro-1,1,1,2,2,2,3-pentafluoropropane have been developed.
These alternative solvents have excellent cleaning property like R113 and a very little effect on the ozone layer. However, since these alternative solvents contain chlorine atoms, they somewhat affect the ozone layer though their influence is very slight. Accordingly, it has been desired to develop a more excellent alternative solvent which does not deplete the ozone layer at all.
The object of the present invention is to provide a novel azeotropic or azeotrope-like composition which satisfies the excellent properties of conventional R113 and can be used as an alternative solvent which does not affect the ozone layer at all and its use.
DISCLOSURE OF INVENTION
The present invention has been made to accomplish the above object, and provides a mixed solvent composition containing 1,1,1,2,2,3,3,4,4,5,5,6,6-tridecafluorohexane (hereinafter referred to as R52-13 p) as a main component, which is selected from the following (1), (2) and (3) and a method for removing soil or water deposited on an object by using the mixed solvent composition: R52-13 p and 10.8 wt % of methanol; from 80 to 99 wt % of R52-13 p and from 1 to 20 wt % of ethanol; and methanol and ethanol, R52-13 p and a hydrocarbon having a carbon number of at least 5 in a proportion of (at least one selected from methanol and ethanol)/(R52-13 p)/(the hydrocarbon having a carbon number of at least 5)=from 1 to 25 wt %/from 50 to 98 wt %/from 1 to 25 wt %.
The azeotropic composition consisting of R52-13 p and methanol has a mixing ratio of R52-13 p/methanol=89.2 wt %/10.8 wt % and a boiling point of 52.4.degree. C. at 1,010 hPa.
The azeotropic composition consisting of R52-13 p and ethanol has a mixing ratio of R52-13 p/ethanol=91.1 wt %/8.9 wt % and a boiling point of 60.0.degree. C. at 1,004 hPa.
Japanese Unexamined Patent Publication No. 194992/1993 discloses an azeotrope-like composition consisting of R52-13 p and methanol in a proportion of R52-13 p/methanol=from 91 to 95 wt %/from 5 to 9 wt %. The present invention is based on the discovery of a azeotropic composition outside the compositional range of the azeotrope-like composition. The azeotropic composition consisting of R52-13 p and methanol of the present invention has advantages that it can retain its performance very stably without any change in its compositi
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patent: 5259983 (1993-11-01), Van Der Puy
patent: 5266231 (1993-11-01), Robeck et al.
patent: 5266232 (1993-11-01), Robeck et al.
patent: 5268122 (1993-12-01), Rao et al.
patent: 5346645 (1994-09-01), Omure et al.
patent: 5494601 (1996-02-01), Flynn et al.
Ikehata Michino
Kitamura Kenroh
Oharu Kazuya
Tsuzaki Masaaki
AG Technology Co., Ltd.
McGinty Douglas J.
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