Mixed solvent composition

Abstract

A mixed solvent composition, for cleaning electronic components, which consists essentially of dichloropentafluoropropane and 1,1,1,2,3,4,4,5,5,5-decafluoropentane.

Description

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.

R113: 1,1,2-trichloro-1,2,2-trifluoroethane R225: a mixture of one or two or more of dichloropentafluoropropane having the molecular formula C.sub.3 HCl.sub.2 F.sub.5 R225ca: 3,3-dichloro-1,1,1,2,2-pentafluoropropane R225cb: 1,3-dichloro-1,1,2,2,3-pentafluoropropane R225mix: a mixture of at least two dichloropentafluoropropane isomers selected from the group consisting of R225ca, R225cb and other dichloropentafluoropropane isomers R43-10mee: 1,1,1,2,3,4,4,5,5,5-decafluoropentane R51-14M: a mixture of one or two or more of perfluorohexane having the molecular formula C.sub.6 F.sub.14 R51-14: perfluoro (n-hexane) R51-14my: perfluoro (4-methylpentane) R51-14mcy: pefluoro (3-methylpentane) R51-14mix: a mixture of at least two perfluorohexane isomers selected from the group consisting of R51-14, R51-14my, R51-14mcy and other perfluorohexane isomers Azeotropic mixed solvent composition: a mixed solvent composition, the composition of which does not substantially vary even by repeating distillation-condensation operations Azeotropic-like mixed solvent composition: a mixed solvent composition, the 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 comprising 55% of R225ca and 45% of R51-14.

(9) An azeotropic-like mixed solvent composition comprising from 25 to 60% of R225cb and from 40 to 75% of R51-14mix comprising R51-14 as the main component.

(10) An azeotropic-like mixed solvent composition comprising from 25 to 60% of R225cb and from 40 to 75% of R51-14.

(11) An azeotropic mixed solvent composition comprising 45% of R225cb and 55% of R51-14.

(12) An azeotropic-like mixed solvent composition comprising from 25 to 70% of R225mix and from 30 to 75% of R51-14mix comprising R51-14 as the main component.

(13) An azeotropic-like mixed solvent composition comprising from 25 to 70% of R225mix and from 30 to 75% of R51-14.

The present invention further provides a mixed solvent composition comprising R225, an alcohol and at least one component selected from the group consisting of R43-10mee and R51-14M, as the essential components. Preferably, in this composition, the proportion of R43-10mee is from 10 to 1000 parts by weight, the proportion of R51-14M is from 30 to 500 parts by weight and the proportion of an alcohol is from 1 to 100 parts by weight, to 100 parts by weight of R225. More preferable examples include the following azeotropic or azeotropic-like mixed solvent compositions (14) to (16).

(14) an azeotropic-like mixed solvent composition comprising from 20 to 50% of R225mix, from 45 to 75% of R51-14M and from 3 to 10% of methanol.

(15) An azeotropic-like mixed solvent composition comprising from 20 to 45% of R225mix, from 47 to 75% of R51-14M and from 3 to 8% of ethanol.

(16) An azeotropic-like mixed solvent composition comprising from 20 to 60% of R225mix, from 38.5 to 75% of R51-14M and from 1.5 to 7% of 2-propanol.

In addition to the above-mentioned methanol, ethanol and 2-propanol, preferable other examples of an alcohol include 1-propanol, 1-butanol, 2-butanol, isobutanol, t-butanol and the like.

Preferable examples of R225 include R225ca or R225cb respectively alone or a mixture of R225ca and R225cb. The mixture of R225ca and R225cb is preferably a mixture of from 0.01 to 99.99% of R225ca and from 0.01 to 99.99% of R225cb, more preferably a mixture of from 1 to 99% of R225ca and from 1 to 99% of R225cb. The mixture of R225ca and R225cb exhibits azeotropic-like action in a wide composition range. A preferable example of R225mix include a mixture of R225ca and R225cb.

R51-14M is preferably R51-14, R51-14my or R51-14mcy respectively alone or a mixture of at least one of these compounds. When R51-14M is a mixture, such a mixture should preferably comprise R51-14 as the main component. A preferable mixture example of R51-14M is a mixture comprising from 65 to 77% of R51-14, from 16 to 26% of R51-14my and from 2 to 12% of R51-14mcy, more preferably a mixture comprising from 70 to 75% of R51-14, from 18 to 22% of R51-14my and from 5 to 10% of R51-14mcy.

In order to improve mainly a dissolving property, the mixed solvent composition of the present invention may contain one or two or more compounds selected from the following compounds in an amount of from 0.1 to 50%, preferably from 0.1 to 30%, more preferably from 0.1 to 20%:

hydrocarbons such as n-pentane, 2-methylbutane, 2,2-dimethylpropane, n-hexane, 3-methylpentane, 2,2-dimethylbutane, 2,3-dimethylbutane, n-heptane, 2-methylhexane, 3-methylhexane, 2,3-dimethylpentane, 2,4-dimethylpentane, n-octane, 2,2,3-trimethylpentane, 2,2,4-trimethylpentane, cyclopentane, cyclohexane, methylcyclohexane and ethylcyclohexane; chlorinated hydrocarbons such as dichloromethane, cis-1,2-dichloroethylene, trans-1,2-dichloroethylene, trichloroethylene and tetrachloroethylene; ketones such as acetone, methyl ethyl ketone, methyl butyl ketone and methyl isobutyl ketone; ethers such as diethyl ether, methyl cellosolve, tetrahydrofuran and 1,4-dioxane; chlorofluorohydrocarbons such as 2,2-dichloro-1,1,1-trifluoroethane and 1,1-dichloro-1-fluoroethane; and esters such as methyl acetate, ethyl acetate, propyl acetate and butyl acetate.

In order to improve mainly a stability, the mixed solvent composition of the present invention may contain one or two or more compounds selected from the following compounds in an amount of from 0.001 to 10%, preferably from 0.001 to 5%:

nitro compounds such as nitromethane, nitroethane, nitropropane and nitrobenzene; amines such as diethylamine, triethylamine, i-propylamine, n-butylamine and i-butylamine; phenols such as phenol, o-cresol, m-cresol, p-cresol, thymol, p-t-butylphenol, t-butylcatechol, catechol, isoeugenol, o-methoxyphenol, bisphenol A, isoamyl salicylate, benzyl salicylate, methyl salicylate and 2,6-di-t-butyl-p-cresol; and triazoles such as 2-(2'-hydroxy-5'-methyl-phenyl)benzotriazole, 2-(2'-hydroxy-3'-t-buthyl-5'-methylphenyl)-5-chlorobenzotriazole, 1,2,3-benzotriazole and 1-�(N,N-bis-2-ethylhexyl)aminomethyl!benzotriazole.

The mixed solvent composition of the present invention has a dissolving power at the same degree as a conventional R113 type solvent, and can be used suitably in various ways. Specifically, it is used as a paint solvent, an extractant, or a cleaning agent for removing grease, oil, wax, ink or the like. Also, it is used as a cleaning agent or a dust-removing agent for glass, ceramic, plastic, elastomer, rubber, metal or other various articles. More specifically, it is used suitably as a cleaning agent or a dust-removing agent for ICs, electric devices, precision machines, optical lenses or the like.

As a cleaning method, various methods including manual wiping, immersing, spraying, vibrating, supersonic cleaning, vapor degreasing or a combination of these methods, may be used.

The mixed solvent composition of the present invention provides the excellent properties of conventional R113 and also provides an advantage that it does not substantially affect the ozone layer.

BEST MODE FOR CARRYING OUT THE INVENTION

The present invention is further illustrated by the following Examples.

Evaluation was conducted by the following three methods.

(1) A test coupon (25 mm.times.30 mm.times.2 mm) made of SUS-304 was dipped in a machine oil (CQ-30, manufactured by Nippon Petrochemicals Co., Ltd.) and then immersed in the mixed solvent compositions of the present invention as identified in Tables for 5 minutes. Thereafter, the degree of removal of the machine oil was evaluated. The results are shown with evaluation standards for the degree of removal A such that .circleincircle.: excellently removed, .DELTA.: slightly remained and X: substantially remained.

(2) Flux (speedy flux AGF-J-I: manufactured by Asahi Kagaku Kenkyusho) was coated on the entire surface of a printed circuit board (50 mm.times.100 mm.times.1.6 mm) made of epoxy-glass, and soldering was carried out at a soldering temperature of 260.degree. C. by means of a wave soldering machine. Then, defluxing was carried out by immersing it in the compositions of the present invention as identified in Tables for 3 minutes, and the degree of removal of the flux was evaluated. The results are shown with evaluation standards for the degree of removal B such that .circleincircle.: excellently removed, .DELTA.: slightly remained and X: substantially remained.

(3) A glass plate of 30 mm.times.18 mm.times.5 mm in size was dipped in pure water and then immersed in the compositions of the present invention shown in Tables for 20 seconds to be dewatered. The glass plate was taken out and immersed in anhydrous methanol, and the degree of removal of deposited water was evaluated from the increase of water in the methanol. The results are shown with evaluation standards for the degree of removal C such that .circleincircle.: excellently removed, .DELTA.: slightly remained and X: substantially remained.

EXAMPLE 1

1,000 g of a mixed solvent composition consisting of 48% of R43-10mee (b.p. 53.6.degree. C.) and 52% of R225ca (b.p. 51.1.degree. C.) was charged into a distillation flask, and the flask was connected to a distillation column having a number of theoretical plates of 5. Then, the composition was heated and refluxed for 2 hours. After the composition reached equilibrium, the fraction was periodically collected and analyzed by gas chromatography. The results are shown in Table 1.

TABLE 1______________________________________Portion offractioncollected Composition (%)(%) R43-10mee R225ca______________________________________20 48.0 52.040 48.0 52.060 48.0 52.0______________________________________

EXAMPLE 2

20 kg of mixed solvent composition consisting of 55% of R43-10mee and 45% of R225ca was charged into a small degreaser with one-sump, and the degreaser was operated for 6 hours per day for 3 days. Samples were periodically taken from the cleaning sump and the water separator and analyzed by gas chromatography. The results are shown in Table 2.

TABLE 2______________________________________ Composition (%) Cleaning sump Water separatorTime R43-10mee R225ca R43-10mee R225ca______________________________________After 6 55.0 45.0 55.0 45.0hoursAfter 12 55.1 44.9 55.0 45.0hoursAfter 18 55.1 44.9 54.9 45.1hours______________________________________

EXAMPLE 3

The same procedure as in Example 2 was repeated, except that 20 kg of a mixed solvent composition consisting of 40% of R43-10mee and 60% of R225ca was used as a mixed solvent composition. The results are shown in Table 3.

TABLE 3______________________________________ Composition (%) Cleaning sump Water separatorTime R43-10mee R225ca R43-10mee R225ca______________________________________After 6 40.0 60.0 40.0 60.0hoursAfter 12 39.9 60.1 40.1 59.9hoursAfter 18 39.9 60.1 40.1 59.9hours______________________________________

EXAMPLE 4

The same procedure as in Example 1 was repeated, except that 1,000 g of a mixed solvent composition consisting of 58% of R43-10mee and 42% of R225cb (b.p. 56.1.degree. C.) was used as a mixed solvent composition. The shown in Table 4.

TABLE 4______________________________________Portion offractioncollected Composition (%)(%) R43-10mee R225cb______________________________________20 58.0 42.040 58.0 42.060 58.0 42.0______________________________________

EXAMPLE 5

The same procedure as in Example 2 was repeated, except that 20 kg of a mixed solvent composition consisting of 70% of R43-10mee and 30% of R225cb was used as a mixed solvent composition. The results are shown in Table 5.

TABLE 5______________________________________ Composition (%) Cleaning sump Water separatorTime R43-10mee R225cb R43-10mee R225cb______________________________________After 6 70.0 30.0 70.0 30.0hoursAfter 12 70.1 29.9 70.0 30.0hoursAfter 18 70.1 29.9 69.9 30.1hours______________________________________

EXAMPLE 6

The same procedure as in Example 2 was repeated, except that 20 kg of a mixed solvent composition consisting of 50% of R43-10mee and 50% of R225cb was used as a mixed solvent composition. The results are shown in Table 6.

TABLE 6______________________________________ Composition (%) Cleaning sump Water separatorTime R43-10mee R225cb R43-10mee R225cb______________________________________After 6 50.0 50.0 50.0 50.0hoursAfter 12 49.9 50.1 50.1 49.9hoursAfter 18 49.9 50.1 50.1 49.9hours______________________________________

EXAMPLE 7

The same procedure as in Example 2 was repeated, except that 20 kg of a mixed solvent composition consisting of 90% of R43-10mee and 10% of R225mix (R225ca/R225cb=45%/55% mixture) was used as a mixed solvent composition. The results are shown in Table 7.

TABLE 7______________________________________Composition (%)Cleaning sump Water separatorTime R43-10mee R225mix R43-10mee R225mix______________________________________After 6 90.0 10.0 90.0 10.0hoursAfter 12 90.1 9.9 89.9 10.1hoursAfter 18 90.1 9.9 89.9 10.1hours______________________________________

EXAMPLE 8

The same procedure as in Example 2 was repeated, except that a mixed solvent composition consisting of 50% R43-10mee and 50% of R225mix (R225ca/R225cb=45%/55% mixture) was used as a mixed solvent composition. The results are shown in Table 8.

TABLE 8______________________________________Composition (%)Cleaning sump Water separatorTime R43-10mee R225mix R43-10mee R225mix______________________________________After 6 50.0 50.0 50.0 50.0hoursAfter 12 50.0 50.0 50.0 50.0hoursAfter 18 49.9 50.1 50.1 49.9hours______________________________________

EXAMPLES 9 to 16

By using the mixed solvent compositions shown in Table 9, a machine oil cleaning test (A) was carried out.

TABLE 9______________________________________ Degree ofNo Solvent composition % removal A______________________________________ 9 R43-10mee 55 .circleincircle. R225ca 4510 R43-10mee 48 .circleincircle. R225ca 5211 R43-10mee 40 .circleincircle. R225ca 6012 R43-10mee 70 .circleincircle. R225cb 3013 R43-10mee 58 .circleincircle. R225cb 4214 R43-10mee 50 .circleincircle. R225cb 5015 R43-10mee 90 .circleincircle. R225ca 4 R225cb 616 R43-10mee 50 .circleincircle. R225ca 10 R225cb 40______________________________________

EXAMPLE 17 to 24

By using the mixed solvent compositions shown in Tables 10 and 11, a defluxing test (B) was carried out.

TABLE 10______________________________________ Degree ofNo Solvent composition % removal B______________________________________17 R43-10mee 50 .circleincircle. R225ca 40 2-propanol 1018 R43-10mee 45 .circleincircle. R225ca 50 methanol 519 R43-10mee 36 .circleincircle. R225ca 56 ethanol 820 R43-10mee 60 .circleincircle. R225cb 30 methanol 10______________________________________ TABLE 11______________________________________ Degree ofNo Solvent composition % removal B______________________________________21 R43-10mee 55 .circleincircle. R225cb 40 2-propanol 522 R43-10mee 47 .circleincircle. R225cb 47 ethanol 623 R43-10mee 80 .circleincircle. R225ca 4 R225cb 6 methanol 1024 R43-10mee 50 .circleincircle. R225ca 20 R225cb 25 2-propanol 5______________________________________

EXAMPLE 25 to 32

By using the mixed solvent compositions shown in Tables 12 and 13, a test (C) for removing deposited water was carried out.

TABLE 12______________________________________ Degree ofNo Solvent composition % removal C______________________________________25 R43-10mee 53 .circleincircle. R225ca 42 2-propanol 526 R43-10mee 40 .circleincircle. R225ca 50 ethanol 1027 R43-10mee 35 .circleincircle. R225ca 50 methanol 1528 R43-10mee 62 .circleincircle. R225cb 33 methanol 5______________________________________ TABLE 13______________________________________ Degree ofNo Solvent composition % removal C.______________________________________29 R43-10mee 55 .circleincircle. R225cb 35 ethanol 1030 R43-10mee 46 .circleincircle. R225cb 46 2-propanol 831 R43-10mee 85 .circleincircle. R225ca 5 R225cb 2 ethanol 832 R43-10mee 45 .circleincircle. R225ca 10 R225cb 35 methanol 10______________________________________

EXAMPLE 33

250 cc of a mixed solvent composition of R225ca (b.p. 51.1.degree. C.) and R51-14 (b.p. 56.degree. C.) in such a ratio as shown in Table 14 was charged into an Othmer type gas-liquid equilibrium distillation apparatus, and was heated. After the composition reached equilibrium, samples were taken from the gas phase and the liquid phase and were analyzed by gas chromatography. The results are shown in Table 14. The azeotropic composition was R225ca/R51-14=55.0%/45.0%.

TABLE 14______________________________________Example 33: Example 33:Gas phase Liquid phasecomposition (%) composition (%)R225ca R51-14 R225ca R51-14______________________________________90.0 10.0 94.0 6.075.0 25.0 79.0 21.055.0 45.0 55.0 45.043.0 57.0 40.0 60.030.0 70.0 25.0 75.014.0 86.0 10.0 90.0______________________________________

EXAMPLE 34

1,000 g of a mixed solvent composition of R225ca/R51-14=30.0%/70.0% was charged into a distillation flask, and the flask was connected to a distillation column having a number of theoretical plates of 5. Then, the composition was heated and fluxed for 2 hours. After the composition reached equilibrium, the fraction was periodically collected and analyzed by gas chromatography. The results are shown in Table 15.

EXAMPLE 35

The same procedure as in Example 34 was repeated, except that 1,000 g of a mixed solvent composition of R225ca/R51-14=75.0%/25.0% was used as a mixed solvent composition. The results as shown in Table 15.

TABLE 15______________________________________Portion offraction Example 34: Example 35:collected Composition (%) Composition (%)(%) R225ca R51-14 R225ca R51-14______________________________________20 30.0 70.0 75.0 25.060 30.0 70.0 75.0 25.080 30.1 69.9 74.9 25.1______________________________________

EXAMPLE 36

The same procedure as in Example 34 was repeated, except that 1,000 g of a mixed solvent composition of R225ca/R51-14/R51-14my/R51-14mcy=30.0%/50.0%/15.0%/5.0% was used as a mixed solvent composition. The results are shown in Table 16.

TABLE 16______________________________________Portion offraction Example 36:collected Composition (%)(%) R225ca R51-14 R51-14my R51-14mcy______________________________________20 30.0 50.0 15.0 5.060 30.0 50.0 15.0 5.080 30.1 49.9 15.0 5.0______________________________________

EXAMPLE 37

The same procedure as in Example 34 was repeated, except that 1,000 g of a mixed solvent composition of R225ca/R51-14/R51-14my/R51-14mcy=75.0%/18.0%/5.0%/2.0% was used as a mixed solvent composition. The results are shown in Table 17.

TABLE 17______________________________________Portion offraction Example 37:collected Composition (%)(%) R225ca R51-14 R51-14my R51-14mcy______________________________________20 75.0 18.0 5.0 2.060 75.0 18.0 5.0 2.080 74.9 18.1 5.0 2.0______________________________________

EXAMPLE 38

250 cc of a mixed solvent composition of R225cb (b.p. 56.1.degree. C.) and R51-14 (b.p. 56.degree. C.) in such a ratio as shown in Table 18 was charged into an Othmer type gas-liquid equilibrium distillation apparatus, and was heated. After the composition reached equilibrium, samples were taken from the gas phase and the liquid phase and were analyzed by gas chromatography. The results are shown in Table 18. The azeotropic composition was R225cb/R51-14=45.0%/55.0%.

TABLE 18______________________________________Example 38: Example 38:Gas phase Liquid phasecomposition (%) composition (%)R225cb R51-14 R225cb R51-14______________________________________20.0 80.0 11.0 89.032.0 68.0 23.0 77.042.0 58.0 41.0 59.045.0 55.0 45.0 55.056.0 44.0 61.0 39.080.0 20.0 87.0 13.0______________________________________

EXAMPLE 39

The same procedure as in Example 34 was repeated, except that 1,000 g of a mixed solvent composition of R225cb/R51-14=25.0%/75.0% was used as a mixed solvent composition. The results are shown in Table 19.

EXAMPLE 40

The same procedure as in Example 34 was repeated, except that 1,000 g of a mixed solvent composition of R225cb/R51-14=60.0%/40.0% was used as a mixed solvent composition. The results are shown in Table 19.

TABLE 19______________________________________Portion offraction Example 39: Example 40:collected Composition (%) Composition (%)(%) R225cb R51-14 R225cb R51-14______________________________________20 25.0 75.0 60.0 40.060 25.0 75.0 60.0 40.080 25.1 74.9 59.9 40.1______________________________________

EXAMPLE 41

The same procedure as in Example 34 was repeated, except that 1,000 g of a mixed solvent composition R225cb/R51-14/R51-14my/R51-14mcy=25.0%/47.0%/13.0%/5.0% was used as a mixed solvent composition. The results are shown in Table 20.

TABLE 20______________________________________Portion offraction Example 41:collected Composition (%)(%) R225cb R51-14 R51-14my R51-14mcy______________________________________20 25.0 54.0 16.0 5.060 25.0 54.0 16.0 5.080 25.1 53.9 16.0 5.0______________________________________

EXAMPLE 42

The same procedure as in Example 34 was repeated, except that 1,000 g of a mixed solvent composition of R225cb/R51-14/R51-14my/R51-14mcy=60.0%/29.0%/8.0%/3.0% was used as a mixed solvent composition. The results are shown in Table 21.

TABLE 21______________________________________Portion offraction Example 42:collected Composition (%)(%) R225cb R51-14 R51-14my R51-14mcy______________________________________20 60.0 29.0 8.0 3.060 60.0 29.0 8.0 3.080 59.9 29.1 8.0 3.0______________________________________

EXAMPLE 43

The same procedure as in Example 34 was repeated, except that 1,000 g of a mixed solvent composition consisting of 50.0% of R225 of R225ca/R225cb=45/55 (weight ratio) and 50.0% of R51-14 was used as a mixed solvent composition. The results are shown in Table 22.

EXAMPLE 44

The same procedure as in Example 34 was repeated, except that 1,000 g of a mixed solvent composition consisting of 25.0% of R225 of R225ca/R225cb=45/55 (weight ratio) and 75.0% of R51-14 was used as a mixed solvent composition. The results are shown in Table 22.

EXAMPLE 45

The same procedure as in Example 34 was repeated, except that 1,000 g of a mixed solvent composition consisting of 70.0% of R225mix of R225ca/R225cb=45/55 (weight ratio) and 30.0% of R51-14 was used as a mixed solvent composition. The results are shown in Table 22.

TABLE 22______________________________________Portionoffraction Example 43: Example 44: Example 45:collect- Composition (%) Composition (%) Composition (%)ed (%) R225mix R51-14 R225mix R51-14 R225mix R51-14______________________________________20 51.0 49.0 25.0 75.0 70.0 30.060 51.0 49.0 25.0 75.0 70.0 30.080 51.2 48.8 25.1 74.9 69.9 30.1______________________________________

EXAMPLE 46

The same procedure as in Example 34 was repeated, except that 1,000 g of a mixed solvent composition consisting of 25.0% of R225mix of R225ca/R225cb=45/55 (weight ratio), 47.0% of R51-14, 13.0% of R51-14my and 5.0% of R51-14mcy was used as a mixed solvent composition. The results are shown in Table 23.

TABLE 23______________________________________Portion offraction Example 46:collected Composition (%)(%) R225mix R51-14 R51-14my R51-14mcy______________________________________20 25.0 54.0 16.0 5.060 25.0 54.0 16.0 5.080 25.1 53.9 16.0 5.0______________________________________

EXAMPLE 47

The same procedure as in Example 34 was repeated, except that 1,000 g of a mixed solvent composition consisting of 55.0% of R225mix of R225ca/R225cb=45/55 (weight ratio), 33.0% of R51-14, 9.0% of R51-14my and 3.0% of R51-14mcy was used as a mixed solvent composition. The results are shown in Table 24.

TABLE 24______________________________________Portion offraction Example 47:collected Composition (%)(%) R225mix R51-14 R51-14my R51-14mcy______________________________________20 55.0 33.0 9.0 3.060 55.0 33.0 9.0 3.080 55.1 32.9 9.0 3.0______________________________________

EXAMPLE 48

The same procedure as in Example 34 was repeated, except that 1,000 g of a mixed solvent composition consisting of 45.0% of R225mix of R225ca/R225cb=45/55 (weight ratio), 40.0% of R51-14, 11.0% of R51-14my and 4.0% of R51-14mcy was used as a mixed solvent composition. The results are shown in table 25.

TABLE 25______________________________________Portion offraction Example 48:collected Composition (%)(%) R225mix R51-14 R51-14my R51-14mcy______________________________________20 45.0 40.0 11.0 4.060 45.0 40.0 11.0 4.080 44.9 40.1 11.0 4.0______________________________________

EXAMPLE 49

The same procedure as in Example 34 was repeated, except that 1,000 g of a mixed solvent composition consisting of 70.0% of R225mix of R225ca/R225cb=45/55 (weight ratio), 22.0% of R51-14, 6.0% of R51-14my and 2.0% of R51-14mcy was used as a mixed solvent composition. The results are shown in table 26.

TABLE 26______________________________________Portion of Example 49:fraction Composition (%)collected (%) R225mix R51-14 R51-14my R51-14mcy______________________________________20 70.0 22.0 6.0 2.060 70.0 22.0 6.0 2.080 69.9 22.1 6.0 2.0______________________________________

EXAMPLE 50 to 60

By using the mixed solvent compositions shown in Table 27, a machine oil cleaning test (A) was carried out.

TABLE 27______________________________________ Solvent Degree ofExample Composition % removal A______________________________________50 R225ca 30 .circleincircle. R51-14 50 R51-14my 15 R51-14mcy 551 R225ca 40 .circleincircle. R51-14 6052 R225ca 55 .circleincircle. R51-14 4553 R225ca 75 .circleincircle. R51-14 18 R51-14my 5 R51-14mcy 254 R225cb 25 .circleincircle. R51-14 54 R51-14my 16 R51-14mcy 555 R225cb 50 .circleincircle. R51-14 5056 R225cb 45 .circleincircle. R51-14 5557 R225cb 60 .circleincircle. R51-14 29 R51-14my 8 R51-14mcy 358 R225ca 10 .circleincircle. R225cb 15 R51-14 54 R51-14my 16 R51-14mcy 559 R225ca 25 .circleincircle. R225cb 25 R51-14 5060 R225ca 40 .circleincircle. R225cb 30 R51-14 22 R51-14my 6 R51-14mcy 2______________________________________

EXAMPLE 61 to 69

By using the mixed solvent compositions shown in Table 28 and 29, defluxing test (B) and a test (C) for removing deposited water were carried out.

TABLE 28______________________________________ Solvent Degree of Degree ofExample Composition % removal B removal C______________________________________61 R225ca 25 .circleincircle. .circleincircle. R51-14 47 R51-14my 13 R51-14mcy 5 methanol 1062 R225ca 40 .circleincircle. .circleincircle. R51-14 50 ethanol 1063 R225ca 68 .circleincircle. .circleincircle. R51-14 20 R51-14my 5 R51-14mcy 2 2-propanol 564 R225cb 25 .circleincircle. .circleincircle. R51-14 47 R51-14my 13 R51-14mcy 5 ethanol 1065 R225cb 40 .circleincircle. .circleincircle. R51-14 55 2-propanol 5______________________________________ TABLE 29______________________________________ Solvent Degree of Degree ofExample Composition % removal B removal C______________________________________66 R225cb 50 .circleincircle. .circleincircle. R51-14 25 R51-14my 7 R51-14mcy 3 methanol 1567 R225ca 10 .circleincircle. .circleincircle. R225cb 45 R51-14 29 R51-14my 8 R51-14mcy 3 2-propanol 568 R225ca 20 .circleincircle. .circleincircle. R225cb 20 R51-14 50 methanol 1069 R225ca 5 .circleincircle. .circleincircle. R225cb 25 R51-14 40 R51-14my 11 R51-14mcy 4 ethanol 15______________________________________

EXAMPLE 70

1,000 g of a mixed solvent composition consisting of 45% of R225mix (R225ca/R225cb=45%/55%), 45% of R51-14 and 10% of methanol (MeOH) was charged into a distillation flask, and the flask was connected to a distillation column having a number of theoretical plates of 5. Then, the composition was heated and refluxed for 2 hours. After the composition reached equilibrium, the fraction was periodically collected and analyzed by gas chromatography. The results are shown in Table 30.

EXAMPLE 71

The same procedure as in Example 70 was repeated, except that 1,000 g of a mixed solvent composition consisting of 35% of R225mix (R225ca/R225cb=45%/55%), 62% of R51-14 and 3% of MeOH was used as a mixed solvent composition. The results are shown in Table 30.

TABLE 30______________________________________Portion offraction Example 70: Example 71:collected Composition (%) Composition (%)(%) R225mix R51-14 MeOH R225mix R51-14 MeOH______________________________________20 45.0 45.0 10.0 35.0 62.0 3.040 45.0 45.0 10.0 35.0 62.0 3.060 45.1 44.9 10.0 34.9 62.1 3.0______________________________________

EXAMPLE 72

The same procedure as in Example 70 was repeated, except that 1,000 g of a mixed solvent composition consisting of 40% of R225mix (R225ca/R225cb=45%/55%), 36% of R51-14, 10% of R51-14my, 4% of R51-14mcy and 10% of MeOH was used as a mixed solvent composition. The are shown in Table 31.

TABLE 31______________________________________Portion of Example 72:fraction Composition (%)collected (%) R225mix R51-14 R51-14my R51-14mcy MeOH______________________________________20 40.0 36.0 10.0 4.0 10.040 40.0 36.0 10.0 4.0 10.060 39.9 36.1 10.0 4.0 10.0______________________________________

EXAMPLE 73

The same procedure as in Example 70 was repeated, except that 1,000 g of a mixed solvent composition consisting of 50% of R225mix (R225ca/R225cb=45%/55%), 34% of R51-14, 9% of R51-14my, 4% of R51-14mcy and 3% of MeOH was used as a mixed solvent composition. The results are shown in Table 32.

TABLE 32______________________________________Portion of Example 73:fraction Composition (%)collected (%) R225mix R51-14 R51-14my R51-14mcy MeOH______________________________________20 50.0 34.0 9.0 4.0 3.040 50.0 34.0 9.0 4.0 3.060 50.1 33.9 9.0 4.0 3.0______________________________________

EXAMPLE 74

The same procedure as in Example 70 was repeated, except that 1,000 g of a mixed solvent composition consisting of 20% of R225mix (R225ca/R225cb=45%/55%), 75% R51-14 and 5% of MeOH was used as a mixed solvent composition. The results are shown in Table 33.

TABLE 33______________________________________Portion of Example 74:fraction Composition (%)collected (%) R225mix R51-14 MeOH______________________________________20 20.0 75.0 5.040 20.0 75.0 5.060 19.9 75.1 5.0______________________________________

EXAMPLE 75

The same procedure as in Example 70 was repeated, except that 1,000 g of a mixed solvent composition consisting of 45% of R225mix (R225ca/R225cb=45%/55%), 47% of R51-14 and 8% of ethanol (EtOH) was used as a mixed solvent composition. The results are shown in Table 34.

EXAMPLE 76

The same procedure as in Example 70 was repeated, except that 1,000 g of a mixed solvent composition consisting of 28% of R225mix (R225ca/R225cb=45%/55%), 69% of R51-14 and 3% of EtOH was used as a mixed solvent composition. The results are shown in Table 34.

TABLE 34______________________________________Portion of Example 75: Example 76:fraction Composition (%) Composition (%)collected (%) R225mix R51-14 EtOH R225mix R51-14 EtOH______________________________________20 45.0 47.0 8.0 28.0 69.0 3.040 45.0 47.0 8.0 28.0 69.0 3.060 45.1 46.9 8.0 27.9 69.1 3.0______________________________________

EXAMPLE 77

The same procedure as in Example 70 was repeated, except that 1,000 g of a mixed solvent composition consisting of 30% of R225mix (R225ca/R225cb=45%/55%), 45% of R51-14, 12% of R51-14my, 5% of R51-14mcy and 8% of EtOH was used as a mixed solvent composition. The results are shown in Table 35.

TABLE 35______________________________________Portion of Example 77:fraction Composition (%)collected (%) R225mix R51-14 R51-14my R51-14mcy EtOH______________________________________20 30.0 45.0 12.0 5.0 8.040 30.0 45.0 12.0 5.0 8.060 29.9 45.1 12.0 5.0 8.0______________________________________

EXAMPLE 78

The same procedure as in Example 70 was repeated, except that 1,000 g of a mixed solvent composition consisting of 28% of R225mix (R225ca/R225cb=45%/55%), 50% of R51-14, 13% of R51-14my, 6% of R51-14mcy and 3% of EtOH was used as a mixed solvent composition. The results are shown in Table 36.

TABLE 36______________________________________Portion of Example 78:fraction Composition (%)collected (%) R225mix R51-14 R51-14my R51-14mcy EtOH______________________________________20 28.0 50.0 13.0 6.0 3.040 28.0 50.0 13.0 6.0 3.060 27.9 50.1 13.0 6.0 3.0______________________________________

EXAMPLE 79

The same procedure as in Example 70 was repeated, except that 1,000 g of a mixed solvent composition consisting of 20% of R225mix (R225ca/R225cb=45%/55%), 75% of R51-14 and 5% of EtOH was used as a mixed solvent composition. The results are shown in Table 37.

TABLE 37______________________________________Portion of Example 79:fraction Composition (%)collected (%) R225mix R51-14 EtOH______________________________________20 20.0 75.0 5.040 20.0 75.0 5.060 19.9 75.1 5.0______________________________________

EXAMPLE 80

The same procedure as in Example 70 was repeated, except that 1,000 g of a mixed solvent composition consisting of 20% of R225mix (R225ca/R225cb=45%/55%), 73% of R51-14 and 7% of 2-propanol (2-PrOH) was used as a mixed solvent composition. The results are shown in Table 38.

EXAMPLE 81

The same procedure as in Example 70 was repeated, except that 1,000 g of a mixed solvent composition consisting of 60% of R225mix (R225ca/R225cb=45%/55%), 38.5% of R51-14 and 1.5% of 2-PrOH was used as a mixed solvent composition. The results are shown in Table 38.

TABLE 38______________________________________Portion offraction Example 80: Example 81:collected Composition (%) Composition (%)(%) R225mix R51-14 2-PrOH R225mix R51-14 2-PrOH______________________________________20 20.0 73.0 7.0 60.0 38.5 1.540 20.0 73.0 7.0 60.0 38.5 1.560 20.1 72.9 7.0 59.9 38.6 1.5______________________________________

EXAMPLE 82

The same procedure as in Example 70 was repeated, except that 1,000 g of a mixed solvent composition consisting of 30% of R225mix (R225ca/R225cb=45%/55%), 46% of R51-14, 12% of R51-14my, 5% of R51-14mcy and 7% of 2-PrOH was used as a mixed solvent composition. The results are shown in Table 39.

TABLE 39______________________________________Portion of Example 82:fraction Composition (%)collected (%) R225mix R51-14 R51-14my R51-14mcy 2-PrOH______________________________________20 30.0 46.0 12.0 5.0 7.040 30.0 46.0 12.0 5.0 7.060 29.9 46.1 12.0 5.0 7.0______________________________________

EXAMPLE 83

The same procedure as in Example 70 was repeated, except that 1,000 g of a mixed solvent composition consisting of 50% of R225mix (R225ca/R225cb=45%/55%), 35% of R51-14, 9% of R51-14my, 4.5% of R51-14mcy and 1.5% of 2-PrOH was used as a mixed solvent composition. The results are shown in Table 40.

TABLE 40______________________________________Portion of Example 83:fraction Composition (%)collected (%) R225mix R51-14 R51-14my R51-14mcy 2-PrOH______________________________________20 50.0 35.0 9.0 4.5 1.540 50.0 35.0 9.0 4.5 1.560 50.1 34.9 9.0 4.5 1.5______________________________________

EXAMPLE 84

The same procedure as in Example 70 was repeated, except that 1,000 g of a mixed solvent composition consisting of 20% of R225mix (R225ca/R225cb=45%/55%), 75% of R51-14 and 5% of 2-PrOH was used as a mixed solvent composition. The results are shown in Table 41.

TABLE 41______________________________________Portion of Example 84:fraction Composition (%)collected (%) R225mix R51-14 2-PrOH______________________________________20 20.0 75.0 5.040 20.0 75.0 5.060 20.1 74.9 5.0______________________________________

EXAMPLE 85 to 98

By using the mixed solvent compositions shown in Table 42 (R225mix is a mixture of R225ca/R225cb=45%/55%), a machine oil cleaning test (A), a defluxing test (B) and a test (C) for removing deposited water were carried out. In Table 42, A, B and C indicate the degrees of removal A, B and C of the respective tests.

TABLE 42__________________________________________________________________________Example Solvent composition % A B C__________________________________________________________________________85 R225mix/R51-14/MeOH 45/45/10 .circleincircle. .circleincircle. .circleincircle.86 R225mix/R51-14/MeOH 35/62/3 .circleincircle. .circleincircle. .circleincircle.87 R225mix/R51-14/R51-14my/R51-14mcy/MeOH 40/36/10/4/10 .circleincircle. .circleincircle. .circleincircle.88 R225mix/R51-14/R51-14my/R51-14mcy/MeOH 50/34/9/4/3 .circleincircle. .circleincircle. .circleincircle.89 R225mix/R51-14/EtOH 45/47/8 .circleincircle. .circleincircle. .circleincircle.90 R225mix/R51-14/EtOH 28/69/3 .circleincircle. .circleincircle. .circleincircle.91 R225mix/R51-14/R51-14my/R51-14mcy/EtOH 30/45/12/5/8 .circleincircle. .circleincircle. .circleincircle.92 R225mix/R51-14/R51-14my/R51-14mcy/EtOH 28/50/13/6/3 .circleincircle. .circleincircle. .circleincircle.93 R225mix/R51-14/R51-14my/R51-14mcy/EtOH/2-PrOH 30/45/12/5/6/2 .circleincircle. .circleincircle. .circleincircle.94 R225mix/R51-14/R51-14my/R51-14mcy/EtOH/MeOH 30/45/12/5/6/2 .circleincircle. .circleincircle. .circleincircle.95 R225mix/R51-14/2-PrOH 20/73/7 .circleincircle. .circleincircle. .circleincircle.96 R225mix/R51-14/2-PrOH 60/38.5/1.5 .circleincircle. .circleincircle. .circleincircle.97 R225mix/R51-14/R51-14my/R51-14mcy/2-PrOH 30/46/12/5/7 .circleincircle. .circleincircle. .circleincircle.98 R225mix/R51-14/R51-14my/R51-14mcy/2-PrOH 50/35/9/4.5/1.5 .circleincircle. .circleincircle. .circleincircle.__________________________________________________________________________

Claims

1. A mixed solvent composition, which consists essentially of an azeotropic mixture consisting essentially of 52% by weight of 3,3-dichloro-1,1,1,2,2-pentafluoropropane and 48% by weight of 1,1,1,2,3,4,4,5,5,5-decafluoropentane.

2. A mixed solvent composition, which is an azeotropic mixture consisting essentially of from 42% by weight of 1,3-dichloro-1,1,2,2,3-pentafluoropropane and 58% by weight of 1,1,1,2,3,4,4,5,5,5-decafluoropentane.