JP2000026898A - Detergent composition for liquid crystal panel and cleaning method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a detergent compsn. which can reduce the drainage load and is excellent in detergency, rinsability, and liq. stability by incorporating a surfactant, a specific glycol ether compd., and a hydrocarbon compd. into the same. SOLUTION: At least one surfactant selected from among nonionic and anionic surfactants, a glycol ether compd. of the formula: R1-O-(A1O)n-R2, and 0.1-9 wt.% hydrocarbon compd. of the formula: CxHy are incorporated. In the formulas, R1 is 1-9C alkyl, 1-9C alkenyl, phenyl, or benzyl; R2 is H, 1-9C alkyl, or 1-9C alkenyl; A1 is 2-4C alkylene; (n) is the average number of moles of A1O added and is 1-20, provided when (n) is 2 or higher, then the polyoxyalkylene chain may comprise one kind of oxyalkylene groups or two or more kinds of oxyalkylene groups and when two or more kinds of oxyalkylene groups are present, then they may be bonded to each other randomly or in block; (x) is 6-30; and (y) is 6-50.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention is an efficient and safe alternative to chlorofluorocarbon-based solvents, chlorine-based solvents, non-aqueous hydrocarbon-based solvents, semi-aqueous cleaning agents and high-concentration aqueous cleaning agents, and furthermore, environmental wastewater treatment. The present invention relates to a novel liquid crystal panel cleaning composition with reduced load and a cleaning method using the same.

[0002]

2. Description of the Related Art In the manufacture of liquid crystal panels, upper and lower substrates are stuck together at their peripheral edges with an adhesive so as to seal liquid crystal between two substrates on which transparent electrodes are formed. To form an empty liquid crystal cell. In the empty cell, the opening is immersed in the liquid crystal material in the injection chamber evacuated, and then the injection chamber is opened to the atmosphere, whereby the liquid crystal material is sucked into the liquid crystal chamber, and then the opening is sealed. A liquid crystal panel is formed.

However, in the liquid crystal panel formed in this manner, it is inevitable that a gap portion where the liquid crystal panel substrate faces with a small gap is formed outside the bonding portion between the two liquid crystal panel substrates. Therefore, in the process of forming the liquid crystal panel, the liquid crystal material enters the gap due to a capillary phenomenon when the liquid crystal material is injected into the empty cells. Since the electrode terminals for applying signals to the transparent electrode are formed in this space with high density while maintaining insulation, if the liquid crystal in this part is left as it is, the liquid crystal material dissolves pollutants in the atmosphere. And cause insulation failure.

[0004] Therefore, it is necessary to wash and remove the liquid crystal material that has entered the gap. However, the space between the voids is 1
Since it is very narrow, 0 μm or less, a high degree of cleaning performance is required as a cleaning agent in order to completely remove the liquid crystal material that has entered.

[0005] As described above, the liquid crystal panel has a special structure having a very narrow gap. In order to completely remove the liquid crystal material and other contaminants from the liquid crystal panel, the fluorocarbon panel was previously used. And chlorinated solvents represented by trichloroethane, trichloroethylene, tetrachloroethylene, methylene chloride and the like have been used as good cleaning agents.

However, as part of global environmental measures,
In particular, restrictions on the use of CFCs and chlorine-based solvents have begun, and the demand for alternative cleaning agents has become more active, along with advances in cleaning agent technology. Regarding the technology for developing a detergent without using a solvent, for example, JP-A-3-70800, JP-A-3-212499, JP-A-4-68096, JP-A-4-170500, and JP-A-4-252
No. 299, JP-A-4-318100 and the like are disclosed. However, with the development of the technology for increasing the density of liquid crystal panels, the gap is narrower, and a demand for improvement in production efficiency requires a cleaner that can be cleaned in a shorter time.

Further, in recent years, there has been a change in required quality of a solvent substitute cleaning agent, and reduction of the load on drainage water after washing and rinsing has become an important performance required for the cleaning agent in order to improve environmental measures. .

The cleaning compositions described in the above-mentioned publications which have been developed as liquid crystal panel cleaning agents up to now have a high amount of active ingredients (organic components other than water) in the cleaning composition itself, and therefore, the cleaning composition has COD has about 100,000-80
10,000 ppm. Generally, since these cleaning compositions are used in the form of a stock solution, the height of this active ingredient has a large effect on the drainage load of the washing line, especially the effluent of the rinsing line, causing an increase in the cost of the wastewater treatment process, and Is becoming a problem.

If the active ingredient in the detergent composition can be reduced to 9% by weight or less while maintaining the cleaning performance, a completely new environmentally friendly liquid crystal whose drainage load is reduced to about 1/2 to 1/20. It becomes a cleaning agent for panels.

[0010] However, the reduction of the effective component generally causes a decrease in the dissolving ability and dispersing ability of the liquid crystal material which is a contaminant component, and in the past technology, the conflicting performance of reducing the drainage load and improving the cleaning performance is compatible. I couldn't do that.

[0011]

DISCLOSURE OF THE INVENTION The present invention is used as a cleaning agent for ultrasonic cleaning of a liquid crystal panel, has high detergency and rinsing properties, can reduce drainage load, and has excellent liquid stability. , A novel cleaning composition and a cleaning method.

[0012]

Means for Solving the Problems As a result of diligent studies, the present inventors have studied the cleaning of a liquid crystal panel which requires ultrasonic cleaning as an essential condition, and the cleaning is stabilized by using a specific oil component and a surfactant. Thus, the present inventors have found that a cleaning composition can be obtained, and that a balance between detergency and reduction of drainage load can be achieved, and the present invention has been completed.

That is, the present invention relates to (A) a nonionic surfactant and an anionic surfactant.
At least one surfactant, (B) at least one glycol ether compound selected from the compounds represented by the following general formula (I), and (C) compounds represented by the following general formula (II) Wherein at least one hydrocarbon compound selected from the group consisting of (A) to (C) is contained as an essential component, and the total amount of the components (A) to (C) is 9% by weight or less in the composition. Agent composition.

R ¹ —O— (A ¹ O) _n —R ² (I) (wherein, R ¹ is an alkyl group having 1 to 9 carbon atoms, 1 to 9 carbon atoms)
9 represents an alkenyl group, a phenyl group, a phenyl group or a benzyl group having an alkyl group having 1 to 9 carbon atoms, and R ² represents a hydrogen atom, an alkyl group having 1 to 9 carbon atoms or 1 to 9 carbon atoms.
A ¹ represents an alkylene group having 2 to 4 carbon atoms, and n represents an average number of addition moles of the oxyalkylene chain represented by A ¹ O and represents a number of 1 to 20. Note that n
Is 2 or more, the polyoxyalkylene chain may be the same alkylene oxide added alone, or two or more alkylene oxides may be mixed and added, and in the case of mixed addition, The form may be random addition or block addition.)

C _x H _y (II) (where x represents a number of 6 to 30, and y represents a number of 6 to 50)

The present invention also relates to the above-mentioned cleaning for a liquid crystal panel, wherein the surfactant (A) is at least one surfactant selected from a polyoxyalkylene alkyl ether and a sulfosuccinic anionic surfactant. Agent composition.

Further, the present invention relates to a method for cleaning a liquid crystal panel by ultrasonic cleaning using the above-mentioned cleaning composition for a liquid crystal panel.

The present inventors, when developing the above-described liquid crystal panel detergent composition of the present invention and a method for cleaning a liquid crystal panel using the same, first aimed at achieving both improvement in detergency and reduction in drainage load. As a result of intensive studies on the development of a new liquid crystal panel cleaning agent in a low-concentration system, liquid crystal panel cleaning using ultrasound irradiation as an essential condition It has been found that the sound wave intensity (sound pressure) is attenuated and the ultrasonic effect may hardly be seen. Therefore, it was found that the cleaning when the effective component in the detergent composition was increased exhibited more effective component and more detergency than the ultrasonic cavitation. In such a case, even if the active ingredient is increased at the expense of the rinsing property and the drainage load, the cleaning power by the ultrasonic wave used as the cleaning mechanical power decreases, and the effect of using both is not exhibited. .

Further, when the active ingredient is simply reduced, the intensity of the ultrasonic wave is restored and the drainage load is reduced. However, even if the ultrasonic wave is used for cleaning, the essential detergency is not exhibited at all, or the rinse is not performed. A defect that caused a defect occurred. In view of these circumstances, we have searched for essential components for detergency at low concentrations under the condition that ultrasonic cleaning is an essential condition. As a result, the combination use of glycol ether and a hydrocarbon compound demonstrates that detergency is exhibited even in low concentration regions. Was found.

However, it has been extremely difficult to mix a fixed amount of these water-insoluble (poorly soluble) solvent components to obtain a stable, uniform and transparent washing liquid having a low concentration of 9% by weight in total. As a result of studying the use of these oily components as a stable cleaning liquid, a cleaning composition having the above composition was completed.

[0021]

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, each compound in the liquid crystal panel cleaning composition of the present invention will be described in detail.

The surfactant (A) used in the present invention is at least one surfactant selected from a nonionic surfactant and an anionic surfactant.

Examples of the nonionic surfactant include the following. Here, p indicates the average number of moles of alkylene oxide added. As the alkylene oxide, ethylene oxide, propylene oxide, butylene oxide or a mixed adduct thereof is used.

(1) Polyoxyalkylene (p = 3-4)
0) alkyl or alkenyl (C ₁₀ -C ₂₂ ) ether (2) polyoxyalkylene (p = 3-40) alkyl or alkenyl (C ₆ -C ₁₂ ) phenyl ether (3) polyoxyalkylene (p = 0.5 -40) alkyl or alkenyl (C ₁₀ -C ₂₂ ) amine (4) polyoxyalkylene (p = 0.5-50) alkyl or alkenyl (C ₁₀ -C ₂₂ ) amide (5) ethylene oxide / propylene oxide block adduct (Pluronic type surfactants) (6) alkyl (C ₆ -C ₂₂₎ amine oxide (7) alkyl (C ₆ -C ₂₂₎ amide amine oxide

Among these nonionic surfactants, a particularly preferred one is polyoxyethylene (p = 10 to 20).
Alkyl (C ₁₀ -C ₁₆ ) ether and alkyl (C ₈ -C ₁₆ )
C ₁₈ ) amidoamine oxide. If the surfactant is other than the nonionic surfactant described above, problems such as deterioration of the liquid stability of the detergent composition (decrease in cloud point) and increase in viscosity may occur.

The following are examples of the anionic surfactant.

(1) Linear alkylbenzene sulfonate having an alkyl group having an average of 8 to 16 carbon atoms (2) α-olefin sulfonate having an average of 10 to 20 carbon atoms (3) Sulfosuccinic anionic surfactant (4) A sulfonate of a lower alkyl ester of a fatty acid represented by the following general formula (III) or a disalt of a sulfonated fatty acid:

[0028]

Embedded image (Wherein, R ³ represents an alkyl group or alkenyl group having 8 to 20 carbon atoms, Y represents an alkyl group having 1 to 3 carbon atoms or a counter ion, and Z represents a counter ion)

(5) Alkyl sulfate having an average of 10 to 20 carbon atoms (6) Ethylene oxide having an average of 10 to 20 carbon atoms having a linear or branched alkyl or alkenyl group having an average of 10 to 20 carbon atoms Alkyl (or alkenyl) with
Ether sulfate (7) Saturated or unsaturated fatty acid salt having an average of 5 to 22 carbon atoms

As a counter ion in these anionic surfactants, salts of alkali metals, alkaline earth metals, ammonium or amine compounds are used.

Among these anionic surfactants,
Sulfosuccinic anionic surfactants are preferred, and particularly alkyl (or alkenyl) sulfosuccinate ester type surfactants represented by the following general formula (IV), and sulfosuccinamides represented by the following general formula (V) An ester mixed surfactant, one or more anionic surfactants selected from sulfosuccinic monoamide surfactants and sulfosuccinimide surfactants represented by the following general formula (VI) are preferred .

[0032]

Embedded image (Wherein, R ^{4 to} R ⁸ represent an alkyl group or an alkenyl group having 3 to 22 carbon atoms, and M represents a counter ion and represents a salt of an alkali metal, alkaline earth metal, ammonium or amine compound)

Among the above sulfosuccinic anionic surfactants, dialkyl ester sulfosuccinates in which R ⁴ and R ⁵ in formula (IV) are isobutyl, amyl, hexyl, and octyl (2-ethylhexyl) are more preferable. .

As these counter ions, alkali metals,
Alkaline earth metals, ammonium or amine compounds are used, but in consideration of liquid stability and use environment in which metal ions are eliminated as much as possible, or influence on members, preferably amine compounds, more preferably ammonium, monoethanolamine Ammonium salts and alkanolamine salts selected from, diethanolamine and triethanolamine are preferred.

These sulfosuccinic anionic surfactants not only improve the detergency, but also specifically act as a liquid stabilizing agent and a rinse-in improving agent for the cleaning solution from within a narrow gap. When used in combination with a surfactant, the cloud point can be improved and the rinsing property can be improved.

The component (B) used in the present invention is at least one glycol ether compound selected from the compounds represented by the above general formula (I). Examples of the component (B) include glycol monoethers such as glycol monomethyl ether, glycol monopropyl ether, glycol monobutyl ether, glycol monohexyl ether, and glycol mono-2-ethylhexyl ether. Examples of glycol diethers include glycol dimethyl ether, glycol diethyl ether, glycol dibutyl ether and the like. Further, examples of the phenyl glycol ethers include glycol monophenyl ether, and examples of the benzyl glycols include glycol monobenzyl ether.

In order to improve the detergency, the terminal ether residue has a total carbon number (R ¹ + R ² ) of 6 to 12, preferably 6 to 10, selected from glycol diethers and aromatic glycol ethers. In order to improve the liquid stability, an alkyl group or an alkenyl group having ¹ to 6 carbon atoms (R ¹ ) in a glycol monoether and an R ¹ -O- group having ¹ to 6 carbon atoms are preferred. It is preferable to use those selected from glycol monoethers which are 3 to 9 branched chains or secondary and tertiary alcohol residues. Further, in order to improve the detergency and the liquid stability, it is preferable to use both in combination.

Further, it is preferable that these glycol ether compounds are selected from those having a flash point of 100 ° C. or higher, which is a single glycol ether compound. Water-based detergent. The glycol moiety is preferably formed by addition of ethylene oxide or propylene oxide, and the average number of moles n of addition is preferably 1 to 10.

The component (C) used in the present invention is at least one hydrocarbon compound selected from the compounds represented by the general formula (II). As the component (C), for example,
Examples include paraffin or olefin-based hydrocarbon compounds, aromatic hydrocarbon compounds, alkylbenzene-based hydrocarbon compounds, and alkylnaphthalene-based hydrocarbon compounds. The paraffinic hydrocarbon compound or the olefinic hydrocarbon compound preferably has 6 to 14 carbon atoms. further,
As the olefinic hydrocarbon compound, an α-olefin is particularly preferred, and the alkylbenzene hydrocarbon compound or the alkylnaphthalene hydrocarbon compound preferably has 6 to 14 carbon atoms in the alkyl group.

These compounds may be used alone or in combination of two or more.

Further, it is preferable that these hydrocarbon solvents are selected from compounds having a flash point of 100 ° C. or higher as a single solvent. By using such hydrocarbon solvents, there is no risk of a flash point. A highly water-soluble cleaning agent can be obtained.

In the liquid crystal panel detergent composition of the present invention, the total amount of the above components (A) to (C) is 0.1 to 9
% By weight, preferably 1 to 9% by weight, more preferably 5 to 9% by weight.
9% by weight. When the total amount is less than 0.1% by weight, the effect as a detergent is not exhibited. On the other hand, when the total amount exceeds 9% by weight, the effect of the ultrasonic cleaning used in combination is attenuated and a drainage load is caused.

The mixing ratio of the components (A) to (C) is (A) / ((B) + (C)) = 1/9 to 9/1.
(Weight ratio) is preferable, and a range of 2/8 to 6/4 is particularly preferable. If the ratio is out of this range, the cleaning property deteriorates and it becomes difficult to obtain a uniform and transparent cleaning agent.

The mixing ratio of the component (B) and the component (C) is (B) / (C) = 1/9 to 9/1 (weight ratio).
Is preferable, and the range of 3/7 to 7/3 is particularly preferable. If the ratio is out of this range, the detergency will be poor and the stability of the composition will be poor.

The detergent composition for a liquid crystal panel of the present invention includes:
Other optional components other than the components (A) to (C) include amphoteric surfactants for the purpose of improving the cloud point of the detergent composition, improving the detergency, and improving the liquid stability. It is possible to mix a washing builder, a hydrotrope agent and the like.

Examples of the amphoteric surfactant include lauryl betaine, stearyl betaine, octyl betaine, lauryl betaine amine, lauric amide alkyl betaine,
Lauryl carboxymethyl hydroxyethyl imidazolinium betaine and the like. The compounding amount of the amphoteric surfactant is preferably in the range of 0.1 to 5% by weight, particularly preferably 0.5 to 2% by weight in the detergent composition.
If the ratio is outside this range, the low-temperature stability of the cleaning composition will be poor.

Examples of the washing builder include citrate, phosphate, ethylenediaminetetraacetate and the like. The amount of the cleaning builder is 0.00% in the cleaning composition.
The range is preferably from 1 to 2% by weight, particularly preferably from 0.01 to 1% by weight. If the ratio is outside this range, the effect of addition will not be observed, and disadvantages such as liquid separation will occur.

Examples of the hydrotrope include glycols such as ethylene glycol and propylene glycol, lower alcohols such as methanol and ethanol, toluene sulfonate and xylene sulfonate.
The hydrotrope is added in order to maintain liquid stability and viscosity characteristics, and its compounding amount is preferably in the range of 0.1 to 5% by weight in the detergent composition, more preferably 0.5 to 3% by weight. A range is particularly preferred.

Further, a rust preventive such as benzotriazole, t-butylbenzoate or the like can be added according to the purpose.
0.5 to 1% by weight.

When the above organic optional components are added to the liquid crystal panel cleaning composition of the present invention, the total weight of the cleaning composition active ingredients (components other than water) does not exceed 9% by weight. be able to.

The method for cleaning a liquid crystal panel of the present invention is carried out by using the above-mentioned cleaning composition for a liquid crystal panel as a cleaning agent and using ultrasonic waves as a cleaning mechanical force. Ultrasonic cleaning in the present invention is a cleaning method in which ultrasonic waves are propagated in a cleaning liquid and a physical force due to ultrasonic waves is applied to an object to be cleaned in the cleaning liquid to remove dirt. More specifically, as the ultrasonic cleaning according to the present invention, electric energy is supplied to the ultrasonic vibrator from the ultrasonic oscillator, and cavitation generated by the vibration of the ultrasonic vibrator is used, and the ultrasonic cleaning generally employed (about 15) is used. (Approximately 50 kHz) and a high-frequency ultrasonic cleaning (megasonic cleaning) method using acceleration at a higher frequency to avoid component damage due to cavitation.

Although it is necessary to appropriately change the type of ultrasonic cleaning, the cleaning temperature is preferably 20 to 50 ° C. and the cleaning time is preferably 1 to 10 minutes in the case of ordinary ultrasonic cleaning.

[0053]

EXAMPLES Examples 1 to 14 and Comparative Examples 1 to 5 Each cleaning composition shown in Tables 1 to 4 was prepared, and an evaluation experiment was performed on a representative liquid crystal panel. Table 1 shows the results.
It is shown in FIG. The evaluation methods and criteria for various evaluation experiments are shown below.

(1) Evaluation of Detergency A liquid crystal material was applied to the gap portion of a liquid crystal panel having a gap of 5 μm.
Stabilize at 80 ° C for a time to obtain a sample to be washed. Using the stock solution of the prepared detergent composition, ultrasonic cleaning is performed at 50 ° C. for 3 minutes (ultrasonic cleaner, 50 kHz, 200 w, SC-20, manufactured by Sun Electronics Co., Ltd.). Next, the panel to be cleaned was taken out, subjected to ultrasonic rinsing in ion-exchanged water at 50 ° C. for 1 minute under the same conditions, and then dried in a thermostat at 105 ° C. for 60 minutes.
Dry for minutes. After the drying is completed, the void portion is observed using a polarizing microscope, and the remaining of the liquid crystal material is evaluated according to the following evaluation criteria. In addition, 以上 or more is a pass.

Evaluation of detergency (residual liquid crystal material) A: Completely cleaned.・ ・ ・: Mostly washed. Δ: Slightly washed. ×: Not washed at all.

(2) Evaluation of rinsing properties Using the same liquid crystal panel as in (1), washing thoroughly in ethanol to completely clean the voids. The liquid crystal panel is immersed in each of the prepared cleaning compositions, and the gap is filled with the cleaning liquid by ultrasonic irradiation. The panel filled with the cleaning liquid is heated to 50 ° C
Immersed in ion-exchanged water for 3 minutes, gently lifted, and dried at 105 ° C. for 60 minutes. After the drying is completed, the residue of the detergent in the voids is evaluated using a microscope according to the following evaluation points. In addition, 以上 or more is a pass.

Evaluation of rinsing properties (residual cleaning liquid) A: Complete rinsing is performed. ○: Almost rinsed. Δ: Slightly rinsed. ×: No rinsing is performed.

(3) Liquid Stability The cloud point of the stock solution of each prepared detergent composition was measured and evaluated according to the following evaluation points. In addition, 以上 or more is a pass.

Liquid stability (cloud point) ・ ・ ・: 50 ° C. or more ・ ・ ・: 40 ° C. to less than 50 ° C. ・ ・ ・: 30 ° C. to less than 40 ° C. ×: less than 30 ° C. or cloudiness / separation

(4) COD The COD in the undiluted state of each prepared detergent composition was determined according to JIS.
The measurement was performed according to K010217.

[0061]

Table 1 Composition (wt%) and evaluation results Example 1 2 3 4 5 Di 2-EH Ammonium sulfosuccinate 2 2 2 1.5 POE (p = 7) lauryl ether POE (p = 12) lauryl ether POE (p = 15) Lauryl ether 1 2 1.5 POE (p = 20) Lauryl ether Lauryl dimethylamine oxide Amidopropyl betaine laurate C ₄ H ₉ O (C ₂ H ₄ O) ₂ H 2 2 C ₆ H ₁₃ O (C ₂ H _{4 O) HC 6 H 13 O} (C 2 H 4 O) 2 H 2-EH-O (C 2 H 4 O) 2 H 2 2 1 2 3 C 4 H 9 O (C 2 H 4 O) 2 C ₄ H ₉ 0.5 C ₆ H ₅ O (C ₂ H ₄ O) HC ₁₀ H ₂₂ C ₁₂ H ₂₆ 2 1 2 3 Water 92 91.5 95 92 91 Liquid stability (cloud point) ○ ◎ ○ ◎ ◎ Detergency ○ ◎ ○ ○ ◎ Rinsing ◎ ◎ ◎ ◎ ◎ COD (ppm) 34000 34300 21000 36700 35700 In Table 1 above, 2-EH is an abbreviation for 2-ethylhexyl, and POE is an abbreviation for polyoxyethylene (Table 2). 4
The same).

[0062]

Table 2 Composition (wt%) and Evaluation Results Example 6 7 8 9 10 Di 2-EH Ammonium Sulfosuccinate 20.5 13 1 POE (p = 7) Lauryl Ether 2 POE (p = 12) Lauryl Ether POE ( p = 15) lauryl ether 12 21 POE (p = 20) lauryl ether lauryl dimethylamine oxide 1 amidopropyl betaine laurate 0.5 C ₄ H ₉ O (C ₂ H ₄ O) ₂ H 2 0.5 2 C ₆ H ₁₃ O _{(C 2 H 4 O) H} 3 C 6 H 13 O (C 2 H 4 O) 2 H 2-EH-O (C 2 H 4 O) 2 H 2 2 1 1 C 4 H 9 O (C 2 H ₄ O) ₂ C ₄ H ₉ 11 C ₆ H ₅ O (C ₂ H ₄ O) H 1 C ₁₀ H ₂₂ 2 C ₁₂ H _{26 22 21} Water 92 92.5 92 91 92 Liquid stability (cloud point) ◎ ◎ ◎ ○ ○ Detergency ○ ◎ ○ ◎ ◎ Rinseability ◎ ○ ◎ ◎ ◎ COD (ppm) 38400 43800 34100 37200 34500

[0063]

Table 3 Composition (wt%) and evaluation results Example 11 12 13 14 Di 2-EH Ammonium sulfosuccinate 1 POE (p = 7) lauryl ether POE (p = 12) lauryl ether 2 POE (p = 15) lauryl Ether 22 POE (p = 20) lauryl ether 2 lauryl dimethylamine oxide 1 amidopropyl betaine laurate C ₄ H ₉ O (C ₂ H ₄ O) ₂ H 2 22 2 C ₆ H ₁₃ O (C ₂ H _{4 O) HC 6 H 13 O (} C 2 H 4 O) 2 H 2-EH-O (C 2 H 4 O) 2 H 1 2 2 2 C 4 H 9 O (C 2 H 4 O) 2 C 4 H ₉ 1 C ₆ H ₅ O (C ₂ H ₄ O) HC ₁₀ H ₂₂ C ₁₂ H ₂₆ 1 2 2 2 Water 92 92 92 91 Liquid stability (cloud point) ○ ○ ○ ◎ Detergency ◎ ○ ○ ○ Rinseability ◎ ○ ○ ○ COD (ppm) 34300 33000 33600 36000

[0064]

Table 4 Composition (wt%) and Evaluation Results Comparative Example 1 2 3 4 5 Di 2-EH Ammonium Sulfosuccinate 36 6 23 POE (p = 7) Lauryl Ether 1 POE (p = 12) Lauryl Ether 6 POE (p = 15) Lauryl ether 36 1 POE (p = 20) Lauryl ether Lauryl dimethylamine oxide Amidopropyl betaine laurate C ₄ H ₉ O (C ₂ H ₄ O) ₂ H 36 62 C ₆ H ₁₃ O ( _{C 2 H 4 O) HC 6} H 13 O (C 2 H 4 O) 2 H 6 2-EH-O (C 2 H 4 O) 2 H 3 6 2 2 C 4 H 9 O (C 2 H 4 O ) ₂ C ₄ H ₉ C ₆ H ₅ O (C ₂ H ₄ O) HC ₁₀ H ₂₂ C ₁₂ H ₂₆ 36 2 0.5 Water 88 76 80 94 94.5 Liquid stability (cloud point) ○ △ ◎ ◎ ○ Detergency ○-○ △ △ Rinseability △-○ ◎ ○ COD (ppm) 51000 102000 116200 24800 25000

By performing ultrasonic cleaning using the liquid crystal panel cleaning composition of the present invention, it is possible to achieve both excellent cleaning performance and reduced drainage load.

Claims (3)

[Claims] (A) one or more surfactants selected from a nonionic surfactant and an anionic surfactant, and (B) a compound represented by the following general formula (I). And (C) at least one hydrocarbon compound selected from compounds represented by the following general formula (II) as essential components, and (A) (C) The cleaning composition for a liquid crystal panel, wherein the total amount of the components is 9% by weight or less in the composition. R ¹ -O- (A ¹ O) _n -R ² (I) (wherein, R ¹ is an alkyl group having 1 to 9 carbon atoms, 1 to 9 carbon atoms)
9 represents an alkenyl group, a phenyl group, a phenyl group or a benzyl group having an alkyl group having 1 to 9 carbon atoms, and R ² represents a hydrogen atom, an alkyl group having 1 to 9 carbon atoms or 1 to 9 carbon atoms.
A ¹ represents an alkylene group having 2 to 4 carbon atoms, and n represents an average number of addition moles of the oxyalkylene chain represented by A ¹ O and represents a number of 1 to 20. Note that n
Is 2 or more, the polyoxyalkylene chain may be the same alkylene oxide added alone, or two or more alkylene oxides may be mixed and added, and in the case of mixed addition, form which may either be either block addition random _{addition) C x H y (II)} ( wherein, x is a number of 6 to 30, y is a number of 6-50) 2. The cleaning liquid crystal panel according to claim 1, wherein (A) the surfactant is at least one surfactant selected from a polyoxyalkylene alkyl ether and a sulfosuccinic anionic surfactant. Composition. 3. A method for cleaning a liquid crystal panel by ultrasonic cleaning using the cleaning composition for a liquid crystal panel according to claim 1 or 2.