Cleaning compositions for solid surfaces – auxiliary compositions – Cleaning compositions or processes of preparing – Liquid composition
Patent
1995-05-09
1997-02-04
McGinty, Douglas J.
Cleaning compositions for solid surfaces, auxiliary compositions
Cleaning compositions or processes of preparing
Liquid composition
510365, 510364, 510273, 510175, 134 26, 134 40, 134 42, C11D 750, C11D 730, B08B 308, C23G 5028
Patent
active
055997830
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The present invention relates to a cleaning solvent composition and a method for cleaning or drying acticles, for example, relates to a cleaning solvent composition suitable for removing flux, fats and oils, dust, etc., and a method for cleaning or drying acticles employing thereof.
BACKGROUND ART
When IC components, precision machinery components, etc. are produced, cleaning the components with organic solvent is usuarlly performed heretofore to remove flux, dust, etc. adhered to the components in a process of assembly.
1,1,2-Trichloro-1,2,2-trifluoroethane (hereinafter referred to as R-113) is widely employed as the organic solvent. R-113 is nonflammable, low in toxicity in vivo and excellent in stability. In addition, R-113 has a moderate solubility so that R-113 selectively solubilizes a variety of dirt without attack on metals, plastics, elastomer, etc. When flux on printed-circuit board is cleaned, R-113 is particularly advantageous, because the cleaned articles are composite components made of metals, plastics, elastomer, etc., in most cases.
Since R-113 is suspected of destructing the ozonesphere, as a result, causing cutaneous cancer, utilization of R-113 is gradually controlled.
Cyclic fluorinated hydrocarbons such as 1,1,2,2,3,3-hexafluorocyclopentane disclosed in U.S. Pat. No. 5,176,757 and 1,1,2,2-tetrafluorocyclobutane disclosed in Japanese Unexamined Patent Publication No. 5-140594 are known in addition to R-113 as cleaning solvents.
Since the known cyclic compounds have a number of hydrogen atoms leading to flammability, the compounds may cause a trouble on safety as a cleaning agent when used at elevated temperature and recycled.
DISCLOSURE OF THE INVENTION
The inventors of the present invention, who were engaged in intensive research in view of the prior art, discovered that specific fluorohydrocarbons (1) have no possibility to deplete ozone because of lack of chlorine in the molecule; (2) exert an excellent effect on cleaning flux, fats and oils, dust, etc.; (3) have similarly moderate solubility as R-113 leading to selective solubilization and removal of a variety of dirt without attack on composite components made of metals, plastics, elastomer, etc.; (4) exert an excellent drying effect to remove water from articles by dissolving and separating water adhered to articles; and (5) are excellent as a rinsing agent employed in a cleaning process in a combination with organic solvents, and accomplish the invention.
Thus, the invention is a cleaning solvent composition comprising at least one selected from the group consisting of 1H,2H/-hexafluorocyclobutane, 1,2,2,3,3-pentafluorocyclobutane, 1,2,2,3,3,4,4,5,5-nonafluorocyclopentane, 1H/2H-octafluorocyclopentane, 1H,2H/-octafluorocyclopentane, 1H/3H-octafluorocyclopentane, 1H,4H,2H/-heptafluorocyclopentane, 1H,2H/4H-heptafluorocyclopentane, 1H,2H,4H/-heptafluorocyclopentane, 1H,3H/2H-heptafluorocyclopentane, 1H,2H/3H-heptafluorocyclopentane and 1H,2H/3H-heptafluorocyclopentane (hereinafter referred to as invention I). The invention is preferably a cleaning solvent composition comprising 1H,2H/-hexafluorocyclobutane.
According to the cleaning solvent composition of the invention, the above-mentioned cyclic fluorohydrocarbons, as an active ingredient, demonstrate performance (1) to (5), and is a very useful substance as substitute for R-113. Structural formula, physical properties and methods for producing thereof are shown below with original sources.
TABLE 1 ______________________________________
Synthesis
b.p. Document
______________________________________
##STR1## 1H, 2H/ 63.degree. C.
J. Chem. Soc., 3198.about.3203(1961)
##STR2## 50.degree. C.
##STR3## 38.5.degree. C.
J. Chem. Soc., 2382.about.2391(1965) J.
Chem. Soc., 281.about.289(1963)
##STR4## 1H/2H 1H, 2H/
50.degree. C. 78.degree. C.
J. Chem. Soc., 2382.about.2391(1965) J.
Chem. Soc., 281-289(1963)
##STR5## 1H/3H 1H, 3H/
58.degree. C. 65.degree. C.
J. Chem. Soc., 2382.about.2391(1965) J.
Chem. Soc., 281.about.289(1963)
#
REFERENCES:
patent: 3850759 (1974-11-01), Hutchinson
patent: 3903012 (1975-09-01), Brandreth
patent: 4559154 (1985-12-01), Powell
patent: 5176757 (1993-01-01), Anton
patent: 5268122 (1993-12-01), Rao et al.
patent: 5346645 (1994-09-01), Omure et al.
Fuller et al, "Some Isomeric Hexafluorocyclobutanes and Pentafluorocyclobutenes", J. Chem. Soc. 1961 pp. 3198-3203.
Heitzman et al, "Fluororcyclopentanes Part I. The 1H, 2H- and 1H, 3H-octafluorocyclopentanes, and 1H,3H/2H-Heptafluorocyclopentane", J. Chem. Soc. 1963 pp. 281-289.
Burdon et al, "Fluorocyclopentanes, Part III. The Isomeric 1H:2H:3H- and 1H:2H:4H-Heptaflurorcyclopentanes and the 1H:2H:3H:4H-Hexafluorocyclopentanes", J. Chem. Soc. Mar. 1965 pp. 2382-2391.
Van Der Puy, Michael, et al., "Estimation of hydrocarbon solubilities in hydrofluorocarbons", Journal of Fluorine Chemistry, 67(3), 215-224 Jun. 1994.
Aoyama Hirokazu
Ide Satoshi
Matsuda Takahiro
Yamamoto Akinori
Daikin Industries Ltd.
McGinty Douglas J.
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