Compositions – Solvents
Patent
1996-01-18
1998-10-27
Utech, Benjamin
Compositions
Solvents
510175, 510179, 510185, 510245, 510371, 510408, 510412, C23G 5028, C09K 300, C25F 100
Patent
active
058274545
DESCRIPTION:
BRIEF SUMMARY
The present invention relates to mixed solvent compositions used as cleaning agents for electronic components including a printed circuit board and an IC, precision machinery parts, glass substrates, or the like.
Abbreviations and terms used in the present specification are illustrated below. the molecular formula C.sub.3 HCl.sub.2 F.sub.5 selected from the group consisting of R225ca, R225cb and other dichloropentafluoropropane isomers molecular formula C.sub.6 F.sub.14 the group consisting of R51-14, R51-14my, R51-14mcy and other perfluorohexane isomers composition of which does not substantially vary even by repeating distillation-condensation operations composition of which varies only within the range of .+-.2% even by repeating distillation-condensation operations
BACKGROUND ART
To remove various oils, greases, fluxes and the like, R113 which is nonflammable, low toxic and excellent in stability, or a mixed solvent composition comprising R113 and a solvent miscible with R113 is widely used. Since R113 has such characteristics that it does not have an adverse effect on a base material such as a metal, a plastic or an elastomer and selectively dissolves various soils, it has been suitable for cleaning various electronic components, precision machinery parts, optical components or the like, made of a metal, a plastic, an elastomer or the like. Also, U.S. Pat. No. 5,304,322 discloses a cleaning agent for aircrafts, which comprises a C.sub.4 -C.sub.8 perfluorocarbon, a C.sub.2 -C.sub.5 hydrochlorofluorocarbon and a C.sub.5 -C.sub.9 petroleum distillate. 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 chemical stability that it can diffuse to the stratosphere, where it is decomposed by an ultraviolet ray, producing chlorine radicals and the chlorine radicals cause 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.
An object of the present invention is to provide a novel mixed solvent composition which satisfies the excellent properties of conventional R113 and can be used as an alternative solvent which does not substantially affect the ozone layer.
DISCLOSURE OF INVENTION
The present invention has been made to accomplish the above object, and provides a mixed solvent composition which comprises R225 and at least one component selected from the group consisting of R43-10mee and R51-14M, as the essential components, and a mixed solvent composition which comprises R225, an alcohol and at least one component selected from the group consisting of R43-10mee and R51-14M. In the following description including Examples, "%" means "% by weight".
In the mixed solvent composition comprising R225 and at least one of R43-10mee and R51-14M, as the essential components, the proportion of each of R43-10mee and R51-14M is preferably from 10 to 1,000 parts by weight to 100 parts by weight of R225. More preferable examples include the following azeotropic or azeotropic-like mixed solvent compositions (1) to (13).
(1) An azeotropic-like mixed solvent composition comprising from 40 to 55% of R43-10mee and from 45 to 60% of R225ca.
(2) An azeotropic mixed solvent composition comprising 48% of R43-10mee and 52% of R225ca.
(3) An azeotropic-like mixed solvent composition comprising from 50 to 70% of R43-10mee and from 30 to 50% of R225cb.
(4) An azeotropic mixed solvent composition comprising 58% of R43-10mee and 42% of R225cb.
(5) An azeotropic-like mixed solvent composition comprising from 10 to 50% of R225mix and from 50 to 90% of R43-10mee.
(6) An azeotropic-like mixed solvent composition comprising from 30 to 75% of R225ca and from 25 to 70% of R51-14mix comprising R51-14 as the main component.
(7) An azeotropic-like mixed solvent composition comprising from 30 to 75% of R225ca and from 25 to 70% of R51-14.
(8) An azeotropic mixed solvent composition
REFERENCES:
patent: 5055138 (1991-10-01), Slinn
patent: 5064560 (1991-11-01), Merchant
patent: 5183067 (1993-02-01), Slinn
patent: 5196137 (1993-03-01), Merchant
patent: 5304322 (1994-04-01), Kuse
patent: 5531916 (1996-07-01), Merchant
patent: 5607912 (1997-03-01), Samejima et al.
patent: 5608002 (1997-03-01), Kubo et al.
Kenroh Kitamura
Masaaki Tsuzaki
Michino Ikehata
AG Technology Co., Ltd.
Baxam Deanna
Utech Benjamin
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