Use of halogenated hydrocarbon solvents

Abstract: A solvent consisting essentially of a compound of the formula: CH a Cl b F c CF₂CH x Cl y F z (I) wherein a + b + c = 3, x + y + z = 3, a + x ≧ 1, b + y ≧ 1, and 0 ≦ a, b, c, x, y, z ≦ 3.

Description: TECHNICAL FIELD The present invention relates to the use of certain halogenated hydrocarbon solvents. BACKGROUND ART US-A 3 381 042 discloses a process for preparing 1,1-dichloro-2,2,3,3,3-pentafluoropropane (R225ca). US-A 2 462 402 discloses a reaction which is believed to produce 1,3-dichloro-1,2,2,3,3-pentafluoropropane (R225cb). Research disclosure No. 146, June 1976, pages 13 to 14 discloses the use of 1,2-dichloro-1,1-difluoroethane as displacement drying fluid for spot-free drying of water-wet manufactured items. 1,1,2-Trichloro-1,2,2-trifluoroethane (hereinafter referred to simply as R113) is non-flammable, non-explosive and stable with low toxicity and as such, is widely used as a cleaning agent for a flux employed in the assembling process of electronic parts or precision machine parts or for cutting oils, or as a cleaning agent for clothings such as fur coats or suits. Further, R113 is widely used for removing deposited water after the washing treatment with water of liquid crystal display device parts, electronic parts or precision machine parts. On the other hand, a rinsing agent such as trichloroethylene is used to remove a resist-removing agent deposited on a wafer. 1,1,1-Trichloroethane is used as a cleaning agent to remove a buffing agent deposited on precision metal parts or decorative parts after the buffing treatment thereof. Further, 1,1,1-trichloroethane is used for developing a resist in the preparation of a printed circuit board or a semiconductor circuit, and methylene chloride or perchloroethylene is used for removing the resist after etching treatment. In spite of its various merits, R113 has been found to destroy ozone in the stratosphere, which in turn brings about a skin cancer. On the other hand, methylene chloride, trichloroethylene, perchloroethylene and 1,1,1-trichloroethane are likely to bring about a pollution of underground water, and it is required to minimize the amount of their use. Under these circumstances, it is an object of the present invention to solve such problems and to provide a use of a halogenated hydrocarbon solvent as a substitute for the conventional solvents. DISCLOSURE OF THE INVENTION The present invention provides a use of a compound of CF 3 CF 2 CHCl 2 or CClF 2 CF 2 CHClF for removing deposited water. Now, the present invention will be described in detail with reference to the preferred embodiments. The compounds of the present invention may be used alone or in combination as a mixture. They are useful as a solvent for removing deposited water. When the compounds of the present invention are employed for the above-mentioned purpose, it is preferred to incorporate various other compounds depending upon the particular purposes. For example, an organic solvent such as a hydrocarbon, an alcohol, a ketone, a chlorinated hydrocarbon, an ester or an aromatic compound, or a surfactant, may be incorporated to improve the effects. Such an organic solvent may be incorporated usually in an amount of from 0 to 80% by weight, preferably from 0 to 50% by weight, more preferably from 10 to 40% by weight, in the composition. The surfactant may be used usually in an amount of from 0 to 10% by weight, preferably from 0.1 to 5% by weight, more preferably from 0.2 to 1% by weight. The hydrocarbon is preferably a linear or cyclic saturated or unsaturated hydrocarbon having from 1 to 15 carbon atoms and is usually selected from the group constiting of n-pentane, isopentane, n-hexane, isohexane, 2-methylpentane, 2,2-dimethylbutane, 2,3-dimethylbutane, n-heptane, isoheptane, 3-methylhexane, 2,4-dimethylpentane, n-octane, 2-methylheptane, 3-methylheptane, 4-methylheptane, 2,2-dimethylhexane, 2,5-dimethylhexane, 3,3-dimethylhexane, 2-methyl-3-ethylpentane, 3-methyl-3-ethylpentane, 2,3,3-trimethylpentane, 2,3,4-trimethylpentane, 2,2,3-trimethylpentane, isooctane, nonane, 2,2,5-trimethylhexane, decane, dodecane, 1-pentene, 2-pentene, 1-hexene, 1-octene, 1-nonene, 1-decene, cyclopentane, methylcyclopentane, cyclohexane, methylcyclohexane, ethylcyclohexane, bicyclohexane, cyclohexene, α-pinene, dipentene, decalin, tetralin, amylene and amylnaphthalene. More preferred are n-pentane, n-hexane, cyclohexane and n-heptane. The alcohol is preferably an aliphatic or cyclic saturated or unsaturated alcohol having from 1 to 17 carbon atoms and is usually selected from the group consisting of methanol, ethanol, n-propyl alcohol, isopropyl alcohol, n-butyl alcohol, sec-butyl aclohol, isobutyl alcohol, tert-butyl aclohol, pentyl alcohol, sec-amyl alcohol, 1-ethyl-1-propanol, 2-methyl-1-butanol, isopentyl alcohol, tert-pentyl alcohol, 3-methyl-2-butanol, neopentyl alcohol, 1-hexanol, 2-methyl-1-pentanol, 4-methyl-2-pentanol, 2-ethyl-1-butanol, 1-heptanol, 2-heptanol, 3-heptanol, 1-octanol, 2-octanol, 2-ethyl-1-hexanol, 1-nonanol, 3,5,5-trimethyl-1-hexanol, 1-decanol, 1-undecanol, 1-dodecanol, allyl alcohol, propargyl alcohol, benzyl alcohol, cyclohexanol, 1-methylcyclohexanol, 2-methylcyclohexanol, 3-methylcyclohexanol, 4-methylcyclohexanol, α-terpineol, abietinol, 2,6-dimethyl-4-heptanol, trimethyl nonylalcohol, tetradecyl alcohol and heptadecyl alcohol. More preferred are methanol, ethanol and isopropyl alcohol. The ketone is preferably represented by one of the formulas wherein each of R, R' and R'' is a saturated or unsaturated hydrocarbon group having from 1 to 9 carbon atoms and is usually selected from the group consisting of acetone, methyl ethyl ketone, 2-pentanone, 3-pentanone, 2-hexanone, methyl-n-butyl ketone, methyl butyl ketone, 2-heptanone, 4-heptanone, diisobutyl ketone, acetonitrile, acetone, mesityl oxide, phorone, methyl-n-amyl ketone, ethyl butyl ketone, methyl hexyl ketone, cyclohexanone, methylcyclohexanone, isophorone, 2,4-pentanedione, diacetone alcohol, acetophenone and fenchone. More preferred are acetone and methyl ethyl ketone. The chlorinated hydrocarbon is preferably a satuarted or unsaturated chlorinated hydrocarbon having 1 or 2 carbon atoms and is usually selected from the group consisting of methylene chloride, carbon tetrachloride, 1,1-dichloroethane, 1,2-dichloroethane, 1,1,1-trichloroethane, tetrachloroethane, 1,1,1,2-tetrachloroethane, 1,1,2,2-tetrachloroethane, pentachloroethane, 1,1-dichloroethylene, 1,2-dichloroethylene, trichloroethylene and tetrachloroethylene. More preferred are methylene chloride, 1,1,1-trichloroethane, trichloroethylene and tetrachloroethylene. The surfactant for a solvent for removing deposited water is preferably selected from the group consisting of a polyoxyethylene alkyl ether, a polyoxyethylene polyoxypropylene alkyl ether, a polyoxyethylene alkyl ester, a polyoxyethylene polyoxypropylene alkyl ester, a polyoxyethylene alkyl phenol, a polyoxyethylene polypropylene alkyl phenol, a polyoxyethylene sorbitan ester, a polyoxyethylene polyoxypropylene sorbitan ester, caprylic acid caprylamine and a polyoxyethylene alkylamide. More preferred are caprylic acid caprylamine and a polyoxyethylene alkylamide. The aromatic compound is preferably a benzene derivative or a naphthalene derivative and is usually selected from the group consisting of benzene, toluene, xylene, ethylbenzene, isopropylbenzene, diethylbenzene, sec-butylbenzene, triethylbenzene, diisopropylbenzene, styrene, an alkylbenzene sulfonic acid, phenol, mesitylene, naphthalene, tetralin, butylbenzene, p-cymene, cyclohexylbenzene, pentylbenzene, dipentylbenzene, dodecylbenzene, biphenyl, o-cresol, m-cresol and xylenol. More preferred are an alkylbenzene sulfonic acid and phenol. The ester is preferably represented by one of the following formulas: wherein each of R 1 , R 2 , R 3 , R 4 , R 5 and R 6 is H, OH or a saturated or unsaturated hydrocarbon group having from 1 to 19 carbon atoms. Specifically, it is selected from the group consisting of methyl formate, ethyl formate, propyl formate, butyl formate, isobutyl formate, pentyl formate, methyl acetate, ethyl acetate, propyl acetate, isopropyl acetate, butyl acetate, isobutyl acetate, sec-butyl acetate, pentyl acetate, isopentyl acetate, 3-methoxybutyl acetate, sec-hexyl acetate, 2-ethylbutyl acetate, 2-ethylhexyl acetate, cyclohexyl acetate, benzyl acetate, methyl propionate, ethyl propionate, butyl propionate, isopentyl propionate, methyl butyrate, ethyl butyrate, butyl butyrate, isopentyl butyrate, isobutyl isobutyrate, ethyl 2-hydroxy-2-methylpropionate, butyl stearate, methyl benzoate, ethyl benzoate, propyl benzoate, butyl benzoate, isopentyl benzoate, benzyl benzoate, ethyl abietate, benzyl abietate, bis-2-ethylhexyl adipate, γ-butyrolactone, diethyl oxalate, dibutyl oxalate, dipentyl oxalate, diethyl malonate, dimethyl maleate, diethyl maleate, dibutyl maleate, dibutyl tertarate, tributyl citrate, dibutyl sebacate, bis-2-ethylhexyl cebacate, dimethyl phthalate, diethyl phthalate, dibutyl phthalate, bis-2-ethylhexyl phthalate and dioctyl phthalate. More preferred are methyl acetate and ethyl acetate. A chlorofluorinated hydrocarbon other than those of the claims may be incorporated to the compound of the present invention. When azeotropy or pseudoazeotropy exists with a composition obtained by the combination of the compound of the present invention with other compound, it is preferred to use them under an azeotropic or pseudoazeotropic condition so that there will be no variation in the composition when used by recycling, or no substantial change from the conventional technique will be required. When it is necessary to stabilize the rinsing agent, it is preferred to employ a nitroalkane such as nitromethane, nitroethane or nitropropane, or a cyclic ether such as propylene oxide, 1,2-butylene oxide, 2,3-butylene oxide, epichlorohydrin, styrene oxide, butyl glycidyl ether, phenyl glycidyl ether, glycidol, 1,4-dioxane, 1,3,5-trioxane, 1,3-dioxolan, dimethoxymethane or 1,2-dimethoxyethane, in an amount of from 0.001 to 5.0 % by weight, in combination. For the removal of deposited water by means of the solvent for removing deposited water according to the present invention, it is possible to employ a spraying or showering method or a dipping method in a cool bath, a warm bath, a steam bath or a supersonic bath, or a dipping method with a combination of these baths. Now, the present invention will be described in further detail with reference to Examples. However, it should be understood that the present invention is by no means restricted to such specific Examples. EXAMPLES 1 to 7 Tests for removing deposited water were conducted by using the solvents for removing deposited water as identified in the following Table. A glass sheet of 30 mm x 18 mm x 5 mm was immersed in pure water and then immersed in the solvent for removing deposited water for 20 seconds. Then, the glass sheet was taken out and immersed in dry methanol, whereupon the state of removal of deposited water was determined by the increase the water content. The results are shown in the Table. Example Solvents for removing deposited water Effects for removing deposited water Example 1 R225ca (100) o ○ Example 2 R225cb (100) o ○ Example 3 R225ca(75)/methanol(25) o ○ Example 4 R225ca(75)/acetone(5) isopropyl alcohol(20) o ○ Example 5 R225ca(75)/trichloroethylene(5) ethanol(20) o ○ Example 6 R225ca(75)/n-heptane(15)/methanol(20) o ○ Example 7 R225ca(99.5)/caprylamine caprylic acid(0.5) o ○ The value in the bracket ( ) represents a proportion (% by weight). Evaluation Standards: o ○ Deposited water satisfactorily removed. O Deposited water substantially satisfactorily removed. Δ Deposited water slightly remained. X Deposited water substantially remained. The halogenated hydrocarbon solvents used in the present invention are excellent in that the power for destroying ozone is extremely small as compared with R113 which has been commonly used as a solvent, and the toxicity is lower than the conventional chlorinated hydrocarbon solvent such as trichloroethylene or perchloroethylene, whereby there will be no substantial problem of pollution of underground water. Further, when employed for various purposes, they are capable of providing substantially equal or even higher performance as compared with conventional R113 or chlorinated hydrocarbon solvents.

Claims: The use of a compound of CF 3 CF 2 CHCl 2 or CClF 2 CF 2 CHClF for removing deposited water. The use according to Claim 1, wherein the compound of CF 3 CF 2 CHCl 2 or CClF 2 CF 2 CHClF is used together with from 0 to 80 % by weight of an organic solvent selected from the group consisting of a hydrocarbon, an alcohol, a ketone, a chlorinated hydrocarbon, an ester, an aromatic compound, and from 0 to 10 % by weight of a surfactant.

Inventors: ASANO TERUO, JINUSHI KAZUKI, SAMEJIMA SHUNICHI, WATANABE NAOHIRO, ASANO, TERUO, JINUSHI, KAZUKI, SAMEJIMA, SHUNICHI, WATANABE, NAOHIRO
Applicants: ASAHI GLASS CO LTD, ASAHI GLASS COMPANY LTD.
Application year: 1989
Main classification: F26B5
IPC codes: C11D7, G03F7, F26B5, C07C19, C11D3, B01D12, C23G5