JPH09143497A - Solvent composition for dry cleaning - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a solvent for dry cleaning of clothes, etc., excellent in cleaning property of a petroleum-based dry cleaning solvent, especially cleaning property and safety to a raw material difficult to remove stain, e.g. cotton. SOLUTION: This solvent composition is obtained by mixing 50-90vol.% petroleum-based dry cleaning solvent with 10-50vol.% one or two kinds of materials selected from dibasic acid dialkyl esters (e.g. diisopropyl succinate, diisopropyl glutamate or diisopropyl adipate) represented by the formula, R-O-CO (CH2 )n CO-O-R [R is 1-4C alkyl group and (n) is 2-4].

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a novel dry cleaning solvent composition having improved detergency and safety of petroleum-based dry cleaning solvent.

[0002]

2. Description of the Related Art Conventionally, petroleum-based dry cleaning solvents, perchloroethylene, CFCs 113,1,1,1-trichloroethane have been used as dry cleaning solvents. Among them, CFCs 113,1,1,1 are used. -Trichloroethane has been discontinued at the UNEP meeting since 1995 as a substance that destroys the ozone layer.

For the development of alternative solvents, dry cleaning solvents include detergency, flash point, attack (influence) on fibers and dyes, physicochemical properties such as odor, reaction, etc. Chemical properties such as corrosiveness and thermal stability, acute and chronic toxicity, mutagenicity, teratogenicity and other toxicity,
There are many required factors such as properties related to the environment such as groundwater, atmosphere and atmosphere, economic efficiency, etc. Considering these, there are merits and demerits, even if you yield 100 steps and search for the next best solvent, the above aptitude It is not easy to find a solvent that is relatively well-balanced. Among these, 1-2 alternative solvents have been put to practical use, but it seems that perchlorethylene and petroleum-based solvents will be mainly used for the time being.

However, even among these solvents which are considered to be mainly used in the future, perchlorethylene causes groundwater pollution and the like, and petroleum-based dry cleaning solvents have a higher performance than perchlorethylene or 1,1,1-trichloroethane. There are still problems such as low cleanability and the possibility of causing a fire accident because it is flammable and easily generates static electricity.

Among the problems associated with petroleum-based solvents, the solvent is used as a measure for improving the cleaning property (especially, the material such as cotton has a problem of improving the cleaning property as seen in washing with duster coat). Examples of means for cleaning the above include purification methods (Japanese Patent Publication No. 57-22603), detergents (JP-A-57-78500), adsorbents (JP-A-60-194172), and the like. Proposed and implemented. However, these are also indispensable for clean washing, and there is even cleaning of the solvent, and the property for removing stains on clothing is more than the original washability of petroleum dry cleaning solvents. I don't want to.

Further, prior to washing clothes, there is a method of partially spraying or brushing a treatment liquid mainly composed of dry soap (also referred to as sasara liquid) in order to remove hard-to-remove water-soluble stains and stains. However, this work is labor-intensive, and it is necessary to consider occupational hygiene regarding exposure to solvent vapors, and some items to be washed may cause tearing and damage due to friction. It is not applicable to clothing materials and is not suitable for delicate materials such as silk.

In addition, in order to improve the detergency, there is a method of using dry soap which is a combination of an anionic surface active agent and a nonionic surface active agent. Since no such antistatic property and flexibility can be imparted, recently, a dry soap mainly composed of a cationic surfactant, which emphasizes antistatic property and texture rather than detergency, tends to be used.

Among the problems associated with petroleum-based dry cleaning solvents, there are cases in which clothes are charged with static electricity during dry cleaning work, and sparks ignite vapors of petroleum dry cleaning solvents, leading to a fire accident. . As one measure to prevent fire accidents, the specific resistance value of petroleum-based dry cleaning solvent is set to 1 to prevent the generation of static electricity.
It is necessary to make it as small as about ^09, and for this purpose, it is necessary to add a certain amount (0.25% by volume) or more of dry soap for cleaning. However, since the solvent is being cleaned at the same time, the soap tends to be adsorbed on the cartridge filter containing the activated carbon used for this purpose, and the soap concentration may often be low immediately after replacing the cartridge filter. However, it is necessary to pay close attention when adding soap, such as when replacing it. But,
It is not easy for many cleaning companies who actually carry out soap concentration management work with a cleaning model that has to rely on their experience and feelings, to always maintain the soap concentration above a certain level.

Further, in JP-A-3-143999, a composition containing a dibasic acid ester and a hydrocarbon solvent is used to clean a flux or the like remaining after soldering on the surface of a support such as a printed circuit board. However, it is apparent that it is not related to the dry cleaning of clothes and the like, and is not addressed from the viewpoint of solving various problems of dry cleaning of clothes and the like as described above.

As described above, the technical measures for solving the problems concerning the cleaning properties of petroleum-based dry cleaning solvents, especially the cleaning properties of materials such as cotton that are hard to remove stains, and safety are still insufficient. .

[0011]

DISCLOSURE OF THE INVENTION The present invention provides a solvent composition for dry cleaning of clothes and the like, which is excellent in detergency of petroleum-based dry cleaning solvent, particularly in detergency of a material such as cotton which is hard to remove stains and safety. It is provided.

[0012]

According to the present invention, 50 to 90% by volume of a petroleum dry cleaning solvent contains 10 to 50% by volume of one or more dibasic acid dialkyl esters represented by the following formula (1). % Of a solvent composition for dry cleaning such as clothing, which is preferably mixed, and the dibasic acid dialkyl ester is more preferably selected from succinic acid diisopropyl ester, glutaric acid diisopropyl ester, and adipic acid diisopropyl ester. The present invention relates to the solvent composition described.

R—O—CO (CH ₂ ) _n CO—O—R (1) (In the formula, R is a C _{1 to} C ₄ alkyl group, and n = 2 to
4. As the petroleum-based dry cleaning solvent used in the present invention, among the industrial volatile oils obtained by fractionating crude oil, those belonging to mineral spirits and having a boiling point of 140 to 210 ° C. are generally paraffinic components. , A naphthenic component, an aromatic component alone or a mixture thereof.

Specifically, within a range of initial distillation of 150 ° C. or higher and end point of 205 ° C. or lower, 1) paraffin 44 to 60% by weight, naphthene 18 to 33% by weight, and aroma 7 to 30% by weight. Type (hereinafter referred to as petroleum-based dry cleaning solvent A type), 2) Paraffin 50-60 wt%, naphthene 40-50 wt%, aroma 1 wt% or less composition type (hereinafter petroleum-based dry cleaning solvent B)
3) paraffins having a composition of 99.9% by weight or more (hereinafter referred to as petroleum-based dry cleaning solvent C type). In addition, the purification method includes an extraction method, and does not specify only the fractionation method.

As the naphthenic component, Japanese Patent Publication No.
It also includes low molecular weight synthetic solvents for hydrocarbons, such as low molecular weight polyolefins having side chains as described in 83118. Specific examples of these are:
Ethylene, propylene, butene, hexene, 4 methyl-
It is a low molecular weight polyolefin having a C-8 side chain of α-olefin such as 1-pentene or a mixed olefin thereof.

The dibasic acid dialkyl ester used in the present invention is represented by the above formula (1), and examples thereof include succinic acid, glutaric acid, adipic acid and other dimethyl esters, diethyl esters and dipropyl esters. C1 to C4 dialkyl esters such as diisopropyl ester, dibutyl ester, diisobutyl ester, and ditertiary butyl ester. Among these, one kind or a combination of two or more kinds can be used. When the compatibility with the petroleum-based dry cleaning solvent is not sufficient, a surfactant or the like may be used as the compatibilizing agent.

[0017] Furthermore, the polarity is maintained, the hydrophilicity is suppressed, and the compatibility with petroleum-based dry cleaning solvents is further enhanced without using a compatibilizer, and the composition is stable against hydrolysis. Yes, low viscosity, diisopropyl ester is preferable from the viewpoint of having a low surface tension, also, as the dibasic acid, in order to accelerate the drying rate of the solvent composition for dry cleaning, among the above, succinic acid having a low molecular weight is preferable. Therefore, succinic acid diisopropyl ester is the most preferred dibasic acid dialkyl ester.

In the solvent composition for dry cleaning of clothes and the like according to the present invention, when the amount of the dialkyl dialkyl ester is in the range of 10% by volume or more and 50% by volume or less, a synergistic effect of both solvents is recognized, and particularly stains. It has been found to have excellent cleaning results on non-stripping cotton. That is, 10% by volume
If the amount is less than the above, not only the antistatic effect of the solvent is insufficient, but also the improvement of the cleaning property is not clearly shown. 10% by volume
From the above, it is recognized that the antistatic effect and the detergency of the oil-soluble stain and the water-soluble stain are remarkably improved as compared with the petroleum-based dry cleaning solvent. On the other hand, when the content exceeds 50% by volume, the detergency against oil-soluble stain tends to be rather deteriorated, which is not preferable. Further, if the content exceeds 50% by volume, the attack (influence) on the clothes using the special clothing material in the dry cleaning becomes more remarkable than that of the petroleum dry cleaning solvent. And the drying becomes slow, which is not preferable. For the above reasons, the dry cleaning solvent composition of the present invention, for petroleum-based dry cleaning solvent,
The dibasic acid dialkyl ester is preferably mixed in the range of 10% by volume or more and 50% by volume or less.

Further, in the range of 20% by volume or more and 35% by volume or less, those properties are more effectively expressed,
More preferable. Here, clothing includes clothes such as woven and knitted clothes, Japanese clothes, bedding such as futons and blankets, mats, and textile products such as leather and fur that are usually washed by dry cleaning.

[0020]

BEST MODE FOR CARRYING OUT THE INVENTION The present invention will be specifically described below with reference to the following examples and comparative examples, but these do not limit the scope of the present invention.

[0021]

Example 1 With respect to the solvent composition for dry cleaning of the present invention, a cleaning test for oil-soluble stains is conducted in a system to which soap is added. Detergency test for oil-soluble stains is 1
50 cc of the test solvent was placed in a 00 cc Erlenmeyer flask, and the whiteness of the cotton or wool was measured beforehand with a fully automatic color difference meter (manufactured by Tokyo Denshoku Co., Ltd.). Oil: Liquid paraffin: Carbon black: Red clay (Kanto loam layer) = 1: 3: 0.8: 0.1 Dissolved and uniformly dispersed with 1,1,1-trichloroethane in a cloth. Create. Material: cotton, wool, size: width 5 cm x length 5 cm], 2 pieces each (n = 2)
After putting it in, at room temperature (around 25 ° C), for a fixed time (10 minutes for the cleaning test of the cotton-contaminated cloth, 5 minutes for the cleaning test of the wool-contaminated cloth), constant vibration / amplitude (vibration: 180 times / minute, Amplitude; 4
Shaker set to 0 mm (made by Yamato Scientific Co., Ltd.)
Model: SA-31) and oscillate to wash.

The washed contaminated cloth is taken out from the flask with tweezers, sandwiched with tissue paper and pressed to absorb and remove the solvent. After that, it is air-dried and, if necessary, sufficiently dried with a drier until the odor of the solvent disappears. The whiteness of the contaminated cloth thus obtained is measured by the above-mentioned fully automatic color difference meter. Separately, measure the whiteness of the original cloth (white cloth) on which the contaminated cloth was made.

The cleaning rate (%) for determining the cleaning property is obtained by the following formula. Detergency ratio (%) = _{[(W 2 -W 1) / (} W 0 -W 1) ] ×
100 (In the formula, W ₀ is the whiteness of the original cloth (white cloth) on which the contaminated cloth was prepared, W ₁ is the whiteness of the contaminated cloth before cleaning, and W ₂ is the whiteness of the contaminated cloth after cleaning.) In the above test, the test solvent used was 0.5% by volume of soap [Genbuclean K2 from Genbu Co., Ltd.] used as a petroleum-based cleaning solvent.

As the test solvent, some of the above-mentioned dibasic acid dialkyl esters may be mixed in various proportions within the mixing range of the present invention to prepare petroleum dry cleaning solvents such as A type and C type. (The B type petroleum dry cleaning solvent compositionally falls between A type and C type, so it is omitted here. The same applies hereinafter).
Or a solvent composition mixed with a low molecular weight polyolefin and a mixture of two or more dibasic acid dialkyl esters,
A solvent composition prepared by mixing a petroleum-based dry cleaning solvent such as type C and type C within the composition range of the present invention was used.

The test results are shown in Tables 1 to 4. In contrast to Comparative Example 1 (Table 5 and Table 6) below, the solvent composition for dry cleaning of the present invention exhibits excellent detergency against oil-soluble stains, and particularly the effect on cotton-contaminated cloth. I understand.

[0026]

[Comparative Example 1] A petroleum-based dry cleaning solvent is subjected to a detergency test for oil-soluble stains in a system to which soap is added. In the same manner as in Example 1, as examples of the petroleum-based dry cleaning solvent mentioned above, A-type and C-type petroleum-based dry cleaning solvents and low molecular weight polyolefins and some dibasic acid dialkyl esters mentioned above were used. A test was conducted on a solvent composition having a mixing ratio outside the range of the solvent composition of the present invention.

The test results are shown in Tables 5 and 6.

[0028]

[Reference Example 1] With respect to the solvent composition for dry cleaning and the petroleum-based dry cleaning solvent of the present invention, in a system to which 0.5% by volume of various soaps used in the petroleum-based cleaning solvent was added, detergency against oil-soluble dirt Conduct the test. The test is carried out in the same manner as in Example 1.

As the test solvent, the dry cleaning solvent composition of the present invention and the petroleum-based dry cleaning solvent A type are used. The soap for petroleum-based dry cleaning solvent used in this test is Genbuclean K2 from Genbu Co., Ltd.
Genbclean A2, NOF CORPORATION's Sun Flora,
NS Solnon, a dry star of Nika Kagaku Co., Ltd.

The test results are shown in Table 7. By this test,
Even if the solvent composition for dry cleaning of the present invention is different in soap, a slight difference in cleaning property is recognized due to the difference of soap '', and the cleaning property of the solvent composition for dry cleaning of the present invention by any soap Shows that the results are superior to those of petroleum-based dry cleaning solvents.

[0031]

Example 2 With respect to the solvent composition for dry cleaning of the present invention, a detergent test for water-soluble stains is conducted in a system containing soap. For the detergency test against water-soluble stains, the oil-soluble stain cloth used in Example 1 was replaced with a hydrophilic stain cloth (a water-soluble stain cloth using a water-soluble dye, produced by a cleaning comprehensive research institute; material; cotton / polyester blended fabric; dimensions; 5cm x 5cm). Others are the same as in the first embodiment.

As the test solvent, the mixing ratio of some of the above-mentioned dibasic acid dialkyl esters is changed within the scope of the present invention, and a type A or C type petroleum-based dry cleaning solvent, a low molecular weight solvent is used. A solvent composition prepared by mixing a solvent composition mixed with a polyolefin and a mixture of two or more dibasic acid dialkyl esters in a petroleum-based dry cleaning solvent such as A type or C type within the composition range of the present invention was used.

The test results are shown in Tables 8 and 9. In comparison with Comparative Example 2 (Tables 10 and 11) below, it can be seen that the solvent composition for dry cleaning of the present invention has better detergency for water-soluble stains than the petroleum-based dry cleaning solvent.

[0034]

[Comparative Example 2] A petroleum-based dry cleaning solvent is subjected to a washability test against water-soluble stains in a system to which soap is added. In the same manner as in Example 2, examples of the petroleum-based dry cleaning solvent mentioned above include petroleum-based dry cleaning solvents such as A type and C type, low molecular weight polyolefins, and some dibasic acid dialkyl esters mentioned above. A test was conducted on a solvent composition having a composition ratio outside the range of the present invention.

The test results are shown in Tables 10 and 11.

[0036]

Reference Example 2 A recontamination test is performed on the dry cleaning solvent composition of the present invention in a system to which soap is added.
For the recontamination test, a suspension solution such that 1.6 mg of well-dried carbon black or 3.3 mg of red iron oxide is prepared and placed in a 100 cc Erlenmeyer flask with 50 cc of the test solvent is shaken. Over about 3 hours,
The test solvent was prepared by suspending and dispersing as much as possible. The amount of the above-mentioned pigment added was set to about the upper limit of the stain in consideration of the stain state of the dry cleaning cleaning solvent which is usually used.

In the test, the above test solvent was used at room temperature (25
(Around ℃) under a constant shake / amplitude (vibration: 180 times / minute, amplitude; 40 mm), shake it for 10 minutes or more to well suspend and disperse the pigment, and then add 5 cm x 5 cm 7 cm
Put one piece of each of the cotton gold cloth (Kanakin) and the white cloth of wool muslin and shake for 30 minutes. After that, the cloth on which carbon black or red iron oxide is recontaminated (adhered) is taken out from the flask with tweezers, sandwiched with a tissue paper and pressed to absorb and remove the solvent. Air dry after this,
If necessary, dry thoroughly with a dryer until the odor of the solvent disappears.

The recontamination property was judged by the naked eye (see the note in Table 12 for judgment). In the above test, the test solvent used was 0.5 g of soap used in petroleum-based cleaning solvents [Genbuclean K2 from Genbu Co., Ltd.].
The thing added with the volume% was used. As the test solvent, a petroleum dry cleaning solvent A type was used as an example of a petroleum dry cleaning solvent, to which 25 vol% of diisopropyl succinate was added, and 50 vol% of diisopropyl succinate was added. Tests were conducted on the added product, the product containing 75% by volume of succinic acid diisopropyl ester, and the succinic acid diisopropyl ester alone.

In addition, the same test solvent was tested at the same time without adding soap. Table 12 shows the test results. In the solvent composition for dry cleaning of the present invention, the redeposition property of a cotton gold cloth or wool muslin on a white cloth is almost inferior to that of a petroleum-based dry cleaning solvent in a state where soap is added. In comparison with no soap, the recontamination property of the dry cleaning solvent composition of the present invention is slightly less likely to be recontamination as compared with the petroleum-based dry cleaning solvent.

[0040]

Example 3 With respect to the solvent composition for dry cleaning of the present invention, a dibasic acid dialkyl ester, a mixture of a dibasic acid dialkyl ester and a petroleum-based dry cleaning solvent-volume resistivity (Ω-cm) is measured. As the measurement solvent, dibasic acid dialkyl ester, and petroleum-based dry cleaning solvent, for example, succinic acid diisopropyl ester and petroleum-based dry cleaning solvent A type are selected, and the addition amount of succinic acid diisopropyl ester is changed to change the A type. For a mixture of petroleum-based dry cleaning solvent and succinic acid diisopropyl ester alone, soap concentration was not added, 0.1% by volume,
The measurement was carried out by changing it to 0.25% by volume.

A universal electrometer model MMAII-17 / Kawaguchi Electric Co., Ltd. was used as a measuring instrument. Table 13 shows the measurement results. The volume resistivity decreases as the amount of the dibasic acid dialkyl ester increases, and in contrast to Comparative Example 3 (Table 13) below, the dry cleaning solvent composition of the present invention has a soap It shows that static electricity is less likely to occur even when the concentration becomes low.

[0042]

Comparative Example 3 The volume resistivity (Ω-cm) of a petroleum-based dry cleaning solvent is measured. As the measurement solvent, A type, C type petroleum-based dry cleaning solvent alone, and diisopropyl succinate as an example of the solvent composition in which the composition ratio of the above-mentioned dibasic acid dialkyl ester is outside the range of the present invention, is the present invention. The solvent composition mixed with the petroleum-based dry cleaning solvent A type outside the range of the composition ratio was measured. The same measuring instrument as in Example 3 was used.

Table 13 shows the measurement results.

[0044]

Reference Example 3 With respect to the composition for a solvent for dry cleaning of the present invention, by examining the attacking property (influence level) of the material to be cleaned, particularly the special material, the conventional cleaning method was used in daily cleaning work. Make sure that you can wash general clothing without damaging it, except for extreme fashion clothing, as you do with petroleum-based dry cooling solvents.

An attack test for clothing material is 100c
2 Erlenmeyer flask of c with test solvent of 50 cc
Prepare a set and put a sample (special clothing material; a small piece of cloth,
Since there were a lot of samples, the buttons and the like were put in 2 minutes, but it is sufficient that the samples are sufficiently immersed in the test solvent during the test. At room temperature (around 25 ° C), a shaker (Yamato Scientific Co., Ltd. model: SA-31) set to a constant vibration / amplitude (vibration: 180 times / minute, amplitude: 40 mm) is applied for 30 minutes. After taking it out, let it air dry.

The degree of attack of each material by the test solvent is visually judged. As the sample (special clothing material) to be subjected to the previous test, typical items to be washed that are often seen in dry cleaning (special buttons / decorative items such as polystyrene beads, pearl buttons, leather buttons, special processed cloth, For example, collect acetate, flock print, foam print, lame print, etc.),
A small piece (5 cm × 5 cm) was used as the cloth and the like.

As the test solvent, succinic acid diisopropyl ester as an example of some of the above-mentioned dibasic acid dialkyl esters was used, and the amount of petroleum dry cleaning solvents A type and C was changed. Solvent compositions for dry cleaning of the present invention mixed with types, petroleum-based dry cleaning solvents A type and C type, and succinic acid diisopropyl ester alone were used. In this test, since the sample was hardly affected by dry soap, dry soap was not added to the test solvent.

The test results are shown in Tables 14 and 15. In the mixed composition range of the dibasic acid dialkyl ester of the present invention, the solvent composition for dry cleaning of the present invention shows an attack property of about the same level as that of a conventional petroleum-based dry cleaning solvent, and is a very special material. It can be seen that, except for clothing, it can be cleaned without causing any accident such as damage, discoloration or dissolution.

[0049]

Reference Example 4 A test for investigating the compatibility between the dialkyl dialkyl ester of the present invention and a petroleum-based dry cleaning solvent is conducted. In a test tube having a capacity of 20 cc, 5 cc of petroleum dry cleaning solvent and 5 cc of dibasic acid dialkyl ester are placed at room temperature, and the test tube is stoppered and shaken sufficiently. After this, stand in a test tube stand and let stand for 5 minutes. After that, it is visually inspected whether the two solvents are compatible with each other or separated.

As the test solvent, dimethyl succinate and diisopropyl succinate were used as the dibasic acid dialkyl ester of the present invention, and petroleum dry cleaning solvents A type and C type were used as petroleum dry cleaning solvents. Table 16 shows the results. In the combination of dibasic acid dimethyl ester as dibasic acid dialkyl ester and paraffin-based petroleum-based dry cleaning solvent C type, it does not dissolve but is separated, but in the combination of dibasic acid diisopropyl ester and petroleum-based dry cleaning solvent C type. They are compatible and dissolve well with each other. Further, it can be seen that the petroleum-based dry cleaning type A has a relatively high dissolving power among petroleum-based dry cleaning solvents, and even dibasic acid dimethyl ester having a lower dissolving power than dibasic acid diisopropyl ester is mutually soluble.

From these results, it can be seen that dibasic acid diisopropyl ester has higher solubility in petroleum dry cleaning solvents than dibasic acid dimethyl ester.

[0052]

[Table 1]

[0053]

[Table 2]

[0054]

[Table 3]

[0055]

[Table 4]

[0056]

[Table 5]

[0057]

[Table 6]

[0058]

[Table 7]

[0059]

[Table 8]

[0060]

[Table 9]

[0061]

[Table 10]

[0062]

[Table 11]

[0063]

[Table 12]

[0064]

[Table 13]

[0065]

[Table 14]

[0066]

[Table 15]

[0067]

[Table 16]

[0068]

Industrial Applicability The solvent composition for dry cleaning of clothing and the like according to the present invention is a petroleum dry cleaning solvent (industrial volatile oil; mineral spirit, etc.) in a system to which soap is added.
Is superior to oil-soluble stains in cleaning ability. The effect is particularly remarkable when the object to be washed is cotton. or,
The water-soluble stains also have good cleaning properties, and their redeposition properties on white cloth are almost inferior to those of petroleum dry cleaning to which soap is added. In comparison with the system without soap, the recontamination property is rather superior to the solvent composition for dry cleaning of the present invention. Such cleaning characteristics contribute to improving the quality of cleaning with a petroleum-based dry cleaning solvent and are practically useful.

Furthermore, the dry cleaning composition for clothes and the like of the present invention has a lower volume resistivity than petroleum dry cleaning solvents, and static electricity is generated in the washing and drying steps even when the soap concentration fluctuates slightly. I'm sorry.
As a result, the risk of fire and explosion is considerably reduced compared to the case of using a petroleum-based dry cleaning solvent, and safety is greatly improved. This improvement is modest, but
It is a very important requirement for dry cleaning work sites.

The dry cleaning solvent composition of the present invention has almost the same level of attack as dry petroleum-based dry cleaning solvents in dry cleaning, when used for special clothing materials. Naturally, it also has the important performance of being able to clean everyday clothes, except for extremely extreme fashion clothes.

Claims (2)

[Claims] 1. A petroleum dry cleaning solvent 50 to 9
A solvent composition for dry cleaning of clothing, which is obtained by mixing 0% by volume with 10 to 50% by volume of one or more dibasic acid dialkyl esters represented by the following formula (1). R—O—CO (CH ₂ ) _n CO—O—R (1) (In the formula, R is a C _{1 to} C ₄ alkyl group, and n = 2 to
4. ) 2. The solvent composition according to claim 1, wherein the dibasic acid dialkyl ester is selected from succinic acid diisopropyl ester, glutaric acid diisopropyl ester, and adipic acid diisopropyl ester.