JPH11189787A - Detergent composition for liquid crystal panel - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain the subject composition having a high cleaning ability, capable of completely cleaning a liquid crystal material entering a void site of a liquid crystal panel in a short time and excellent in rinsing properties without any fear about the flash point by including a specific fatty acid salt and a specified glycol ether therein. SOLUTION: This composition contains (A) a fatty acid salt represented by the formula; R<1> -COOM [R<1> is a 5-23C (un)saturated aliphatic hydrocarbon; M is an alkali (alkaline earth) metal, ammonia or the like] and (B) a glycol ether represented by the formula R<2> -CO-(AO)n -R<3> [R<2> is a 1-9C alkyl, phenyl or the like; R<3> is hydrogen, a 1-9C alkyl or the like; AO is a 2-4C oxyalkylene; (n) is the average number of added mol of AO and 1-20]. A lauric salt and the like are preferred as the ingredient A and monoethanolamine and the like are preferred as a counterion. A glycol ether having >=100 deg.C flash point of the simple substance and 4-9 total number of carbon atoms in R<2> and R<3> is preferred as the ingredient B. The ingredients A and B are preferably formulated in respective amounts of 1-50 wt.%.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

[0001] The present invention relates to a fluorocarbon solvent,
The present invention relates to a novel cleaning composition for liquid crystal panels that is safe for the environment and the human body, replacing chlorinated solvents such as trichloroethane, trichloroethylene, tetrachloroethylene, and methylene chloride, and nonaqueous hydrocarbon solvents.

[0002]

2. Description of the Related Art In manufacturing a liquid crystal panel, a liquid crystal chamber is formed by bonding upper and lower substrates with an adhesive at their peripheral edges, leaving a part of an opening, in order to fill the 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 released to the atmosphere, whereby the liquid crystal material is sucked into the liquid crystal chamber and the opening is sealed to form the liquid crystal panel. It 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. Therefore, it is necessary to wash and remove the liquid crystal material that has entered the gap. However, since the space between the voids is as narrow as 10 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.

Freon-based solvents, chlorine-based solvents, and non-aqueous hydrocarbon-based solvents have excellent oil dissolving power and are used for liquid crystal panels, metal parts, glass parts, plastic parts, etc.
It was used as a good cleaning agent for almost all soil components adhering to every part of the industry.

[0005] However, in recent years, as a part of global environmental measures, in particular, the use of chlorine-based solvents has started to be restricted, and the demand for alternative cleaning agents has been increasing. In response to this situation, with respect to liquid crystal panel detergents, a detergent that does not use the solvent has been developed so far.
JP-A-3-70800, JP-A-3-212499
JP, JP-A-4-68096, JP-A-4-17
No. 0500, JP-A-4-252299, and the like. However, in recent years, with the progress 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.

[0006]

SUMMARY OF THE INVENTION The present invention relates to cleaning of a narrow gap panel which has been particularly difficult to clean with a cleaning agent developed as an alternative to the above-mentioned solvent. Liquid crystal material)
An object of the present invention is to provide a cleaning composition which can be completely washed in a short time and has excellent rinsing properties.

[0007]

Means for Solving the Problems The present inventors have made intensive studies on the development of a cleaning agent having a high cleaning ability and no fear of flash point and rinsing properties. It has been found that the above-mentioned object can be achieved in a detergent composition containing glycerol and glycol ether, and the present invention has been completed.

That is, the present invention provides the following general formula (I)
The present invention relates to a liquid crystal panel cleaning composition comprising one or more compounds selected from the compounds represented by the following general formula (II) and one or more compounds selected from the compounds represented by the following general formula (II).

R ¹ -COOM (I) (In the formula (I), R ¹ is a saturated or unsaturated aliphatic hydrocarbon group having 5 to 23 carbon atoms, and M is an alkali metal, an alkaline earth metal, ammonia or an amine. Represents a salt of a compound)

R ² —O— (AO) _n —R ³ (II) (in the formula (II), R ² is an alkyl group having 1 to 9 carbon atoms, an alkenyl group having 1 to 9 carbon atoms, a phenyl group, An alkylphenyl group or a benzyl group having 1 to 9 carbon atoms, R ³ represents a hydrogen atom, an alkyl group having 1 to 9 carbon atoms or an alkenyl group having 1 to 9 carbon atoms, and AO represents an oxyalkylene group having 2 to 4 carbon atoms. And n represents the average number of moles of the oxyalkylene group AO, and is a number from 1 to 20. In the polyoxyalkylene group (AO) _n , the same alkylene oxide is added alone. Or two or more alkylene oxides may be mixed and added.)

The present invention also relates to the above-mentioned detergent composition for a liquid crystal panel, further comprising (c) a nonionic surfactant.

[0012]

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

The component (a) which is blended as an essential component in the detergent composition for a liquid crystal panel of the present invention has the above general formula (I)
At least one compound selected from the compounds represented by

The compound represented by the above general formula (I) includes, for example, caproic acid, caprylic acid, capric acid,
Examples include saturated fatty acid salts such as lauric acid, myristic acid, palmitic acid, stearic acid, arachidic acid, and behenic acid, and unsaturated fatty acid salts such as palmitoleic acid, oleic acid, linoleic acid, and linolenic acid.

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

Among these fatty acid salts, preferred are saturated fatty acid salts, and more preferably at least one selected from linear saturated fatty acid salts having 12 to 16 carbon atoms, such as laurate, myristate, Palmitate is particularly preferred. Further, as a counter ion to be formed, a salt selected from ammonia, monoethanolamine, diethanolamine, and triethanolamine is preferable from the viewpoint of liquid stability.

The amount of component (a) is preferably 0.1 to 70% by weight, more preferably 1 to 50% by weight, in the cleaning composition of the present invention. When the amount is less than 0.1% by weight, the cleaning performance is not exhibited. On the other hand, when the amount exceeds 70% by weight, the improvement in the cleaning performance is not seen and problems such as deterioration of the liquid stability occur.

The component (b) blended as an essential component in the liquid crystal panel cleaning composition of the present invention is represented by the above general formula (II)
At least one compound selected from the compounds represented by

Examples of the compound represented by the above general formula (II) include glycol monoethers such as ethylene glycol monomethyl ether, diethylene glycol monomethyl ether, triethylene glycol monomethyl ether, ethylene glycol monopropyl ether, and diethylene glycol monomethyl ether. Propyl ether, triethylene glycol monopropyl ether, ethylene glycol monobutyl ether, diethylene glycol monobutyl ether, triethylene glycol monobutyl ether, ethylene dipropylene glycol monobutyl ether, ethylene glycol monohexyl ether, diethylene glycol monohexyl ether, ethylene glycol mono-2-ethylhexyl Ether, diethylene glycol Roh-2-ethylhexyl ether, and the like.

The glycol diethers include, for example, ethylene glycol dimethyl ether, ethylene glycol diethyl ether, ethylene glycol dibutyl ether, diethylene glycol dibutyl ether and the like.

The phenyl glycol ethers include, for example, ethylene glycol monophenyl ether, propylene glycol monophenyl ether, diethylene glycol monophenyl ether, triethylene glycol monophenyl ether and the like.

Further, examples of the benzyl glycol ethers include ethylene glycol monobenzyl ether, diethylene glycol monobenzyl ether, triethylene glycol monobenzyl ether, propylene glycol monobenzyl ether and the like.

Each of these compounds may be used alone, or two or more of them may be used in combination.

Of these glycol ether compounds, those having a flash point of 100 ° C. or higher for a single glycol ether product are preferred. Glycol ether has a flash point of 100
If the temperature is lower than 0 ° C., the composition using the composition will show flammability. Among them, those having a total carbon number of the terminal ether residue (total carbon number of the R ² group and the R ³ group in the general formula (II)) of 4 to 18, more preferably 4 to 9, are preferable. More specifically, the number of carbon atoms is preferably 4 or more from the viewpoint of detergency, and preferably 3 or less from the viewpoint of liquid stability. Therefore, when the liquid stability is poor, the total number of carbon atoms of the terminal ether residue is 3 or less. It is preferable to use a glycol ether in combination. Further, the glycol moiety is preferably formed by addition of ethylene oxide or propylene oxide, and the number of moles n of addition is preferably 1 to 10. When the glycol portion is mixed addition, either block addition or random addition may be used.

The amount of component (b) is preferably 0.5 to 90% by weight, more preferably 1 to 50% by weight, in the detergent composition of the present invention. When the amount is less than 0.5% by weight, the effect of addition is not observed and there is no contribution to detergency. Conversely, when the amount exceeds 90% by weight, the effect of improving detergency is not seen even when added.

The components (a) and (b) are mixed at a weight ratio of (a) / (b) = 99/1 to 1
/ 99 is preferable, and 75/25 to 25 is more preferable.
/ 75.

The detergent composition for a liquid crystal panel of the present invention can further contain (c) a nonionic surfactant.

As the nonionic surfactant (c) in the present invention, the following are exemplified. Here, p
Represents 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 to 50) alkyl or alkenyl (C10～C ₂₂₎ amide 5) ethylene oxide-propylene oxide block adduct (Pluronic type surfactants 6) alkyl or alkenyl (C ₁₀ -C ₂₂ ) amine oxide

[0030] Among these nonionic surfactants,
Lioxyethylene (p = 3-20) alkyl (C_Ten~ C
₁₈) Ether, polyoxyethylene (p = 3-20)
Lequil (C₈~ C₉) Phenyl ether, polyoxyethyl
Len (p = 1 to 10) alkyl (C_Ten~ C₁₈) Amine,
Monoalkyl (C_Ten~ C₁₄) Of dimethylamine oxide
Nonionic surfactants selected from among them are preferred,
In addition, polyoxyethylene (p = 5 to 15) alkyl (C
₁₂~ C₁₆) Ether, monoalkyl (C₁₂~ C ₁₄)
Tylamine oxide is preferred.

The amount of component (c) can be 0.1 to 90% by weight in the detergent composition of the present invention, but is preferably 0.5 to 30% by weight. If the amount is less than 0.1% by weight, the penetration into the voids due to the incorporation of the nonionic surfactant cannot be expected. If the amount exceeds 90% by weight, further improvement can be expected. And the rinsability deteriorates.

The detergent composition for a liquid crystal panel of the present invention may further contain water as the component (d). (D)
The amount of water is from 0 to 9 in the cleaning composition of the present invention.
It is 5% by weight, preferably 30 to 90% by weight. If the amount exceeds 95% by weight, the detergency deteriorates.

The cleaning composition for a liquid crystal panel of the present invention includes:
In addition, the following optional components can be blended as needed.

When a washing builder such as citrate, phosphate, ethylenediaminetetraacetate or the like is blended as these optional components, 0.1 to 1 in the detergent composition of the present invention.
It is suitable to add 0% by weight, preferably 0.5 to 5% 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.

Also, glycols such as ethylene glycol and propylene glycol, lower alcohols such as methanol and ethanol, and hydrotropes such as toluene sulfonate and xylene sulfonate for maintaining the liquid stability and viscosity characteristics are used. When incorporated, 1 to 30% by weight, preferably 5 to 20% by weight in the cleaning composition of the present invention.
It is appropriate to mix.

Further, rust inhibitors such as benzotriazole and t-butyl benzoate can be blended according to the purpose, and the blending amount in the detergent composition of the present invention is 0.1%.
It is appropriate to mix 3% by weight.

The detergent composition of the present invention can be washed with the composition as it is, or can be diluted with water and used as an aqueous solution.

As described above, the detergent composition for a liquid crystal panel of the present invention is used as a detergent capable of highly cleaning a liquid crystal material that has penetrated into a void portion of a liquid crystal panel.

[0039]

EXAMPLES The present invention will be described in more detail with reference to the following examples, but the present invention is not limited to the following examples.

Examples 1 to 20 and Comparative Examples 1 to 4 Each cleaning composition shown in Table 1 was prepared, and a representative liquid crystal panel was subjected to an evaluation experiment of detergency and rinsing properties.
Table 1 shows the results. The evaluation of the detergency and the rinsing property was performed using the following methods and criteria.

(1) Method for Evaluating Detergency of Void Part A liquid crystal material is applied to the void part of a liquid crystal panel having a void of 3 μm.
Stabilize at 60 ° C for a time to obtain a sample to be washed. Using a 10% by weight aqueous solution of the prepared detergent composition,
Perform ultrasonic cleaning for 3 minutes. Thereafter, the panel to be cleaned is taken out, immersed in ion exchange water at 40 ° C. for 3 minutes, and rinsed. Further, drying is performed for 60 minutes in a constant temperature dryer at 105 ° C. 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, a circle or more indicates that an effective detergency can be exhibited.

Detergency Evaluation Criteria (Evaluation Based on Remaining State of Liquid Crystal Material) A: Complete cleaning. ：: Almost washed. Δ: Slightly washed. ×: Not washed at all.

(2) Method for evaluating rinsing properties (1) Using a liquid crystal panel similar to the method for evaluating the detergency of voids, a 10% by weight aqueous solution of each cleaning composition directly prepared without infiltrating liquid crystal material. And ultrasonic cleaning at 40 ° C. for 3 minutes. Thereafter, the panel to be cleaned is taken out, and is simply immersed in ion exchanged water at 40 ° C. for 3 minutes to perform rinsing. Furthermore, after drying for 60 minutes in a 105 ° C. constant temperature dryer,
The residual property of the cleaning agent is visually determined using a microscope according to the following evaluation points. In addition, ○ or more indicates that the rinsing property is excellent.

Evaluation criteria for rinsability (evaluation based on residual state of detergent) A: No residual was observed. ：: Very slight residue is observed. Δ: Residue is observed. ×: Many residues.

[0045]

[Table 1]

[0046]

As described above, according to the present invention, a cleaning agent exhibiting a high degree of cleaning and rinsing properties for cleaning a void portion of a liquid crystal panel without using a halogenated hydrocarbon solvent or a hydrocarbon solvent. Can be obtained.

──────────────────────────────────────────────────続 き Continued on front page (51) Int.Cl. ⁶ Identification code FI C11D 9/30 C11D 9/30 10/04 10/04

Claims (2)

[Claims] 1. A composition comprising one or more compounds selected from the compounds represented by the following general formula (I) and one or more compounds selected from the compounds represented by the following general formula (II): Cleaning composition for liquid crystal panels. R ¹ -COOM (I) (In the formula (I), R ¹ is a saturated or unsaturated aliphatic hydrocarbon group having 5 to 23 carbon atoms, and M is a salt of an alkali metal, an alkaline earth metal, ammonia or an amine compound. R ² —O— (AO) _n —R ³ (II) (In the formula (II), R ² is an alkyl group having 1 to 9 carbon atoms, an alkenyl group having 1 to 9 carbon atoms, a phenyl group, An alkylphenyl group or a benzyl group having 1 to 9 carbon atoms, R ³ represents a hydrogen atom, an alkyl group having 1 to 9 carbon atoms or an alkenyl group having 1 to 9 carbon atoms, and AO represents an oxyalkylene group having 2 to 4 carbon atoms. And n represents the average number of moles of the oxyalkylene group AO, and is a number from 1 to 20. In the polyoxyalkylene group (AO) _n , the same alkylene oxide is added alone. Or a mixture of two or more alkylene oxides. May be added) 2. The cleaning composition for a liquid crystal panel according to claim 1, further comprising (c) a nonionic surfactant.