Cleaning and liquid contact with solids – Processes – Using sequentially applied treating agents
Patent
1994-03-14
1997-09-16
McGinty, Douglas J.
Cleaning and liquid contact with solids
Processes
Using sequentially applied treating agents
134 12, 134 31, 134 40, 134 42, 510174, 510170, 510175, 510177, 510365, 510407, 510408, 510412, 510415, 510505, 510411, 510364, 252364, B08B 300
Patent
active
056675941
DESCRIPTION:
BRIEF SUMMARY
INDUSTRIAL FIELD
This invention relates to a cleaning solvent composition and a cleaning process in which flux, oil, mold-releasing agents, printing ink and the like adhered to an object are removed there-from to clean the object using the said cleaning solvent composition.
PRIOR ART
In the prior art, flon 113, a chlorofluoroethane compound, has several advantages including (a) non-combustibility, (b) low biotoxicity and (c) highly selective solubility (able to dissolve fat and oil, grease and wax etc. without damaging plastics, rubber and other high molecular materials), and it has been widely used either by itself, in a mixture with other organic solvents, or in the form of azeotropic compositions as a solvent or cleaning agent. However, it has been feared that flon may destroy the ozone layer in the stratosphere and thereby cause serious adverse effects on the earth's ecosystem including the environment for humans. According to an international agreement it has been concluded to limit the use and production of flon which threatens the ozone layer with destruction. Accordingly, people very much want the development of a solvent or cleaning agent that uses flon substitutes.
Patent Publication Gazette No. 21000/83 discloses a cleaning composition that contains at least 50% by weight of N-methyl-2-pyrrolidone and at least 10% by weight of alkanol amine that can mix with water. Lines 27 to 35 of the sixth column of the cited reference mention that the cleaning composition can be used with a hydrocarbon solvent consisting of Freon such as fluorohydrocarbon and tetrafluoroethane up to about 35%. This composition, however, requires a rinsing process using water (for removal of composition adhered to the surface of the cleaned object) to be followed by a complicated drying process.
OBJECTIVE OF INVENTION
The object of the present invention is to provide a novel cleaning solvent composition that is useful for flon substitute technology and effective as a cleaning agent. The present invention is also intended to provide a nonaqueous cleaning process with no use of water which uses the said solvent composition to efficiently remove flux, oil, mold-releasing agents, printing ink and other residue adhered to an object to be cleaned.
CONSTRUCTION OF INVENTION
The present invention relates to a cleaning solvent composition that is made by either blending aliphatic fluorohydrocarbon as expressed by the general formula and 2n-3.ltoreq.m<2n+2, respectively) or blending a mixture of the said aliphatic fluorohydrocarbon and alcohol having a carbon number of 1 to 4 with at least one selected from a group comprising lactam and/or carboxylic acid amide, tertiary amines, and alcohol having ether linkage and/or amino linkage within its molecules.
The present invention also provides a cleaning process in which an object to be cleaned is dipped into the said cleaning solvent composition for removal of residue or dirty component and thereafter it is rinsed with a rinsing agent composition that is a mixture of the said aliphatic fluorohydrocarbon and the said alcohol having a carbon number 1 to 4, and it is further steam cleaned with the said mixture composition when necessary,
The said cleaning solvent under the present invention is desirably be a blend of either the said aliphatic fluorohydrocarbon or the said mixture with lactam and/or carboxylic acid amide at a blending proportion preferably of 10 to 95% by weight, or more desirably 10 to 50% by weight. The higher content of lactam and/or carboxylic acid amide often exhibits a high ability to remove residue although, in some cases, due to the resistance property of the material of the object to be cleaned, cleanable objects are limited. The lower content, on the other hand, shows a highly selective solubility (ability to dissolve and remove residue without adverse effects on the material of the cleanable object).
In view of the above-mentioned properties, it is desirable to set the blending ratio of the lactam and/or carboxylic acid amide preferably somewhere in the
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Aoyama Hirokazu
Ide Satoshi
Matsuda Takahiro
Omure Yukio
Daikin Industries Ltd.
McGinty Douglas J.
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