JP2683301B2 - Aqueous cleaner composition for liquid crystal - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention is used for manufacturing a liquid crystal display device or the like, and is capable of removing dirt such as liquid crystal adhered to a substrate,
Also, the present invention relates to an aqueous cleaning composition for liquid crystal, which has excellent rinsing properties, is safe, and has no environmental pollution such as CFC.

[0002]

2. Description of the Related Art Generally, a liquid crystal display device uses a liquid crystal cell in which liquid crystal is filled between two substrates having electrodes on opposite surfaces. If the liquid crystal adheres to the outside of the two substrates, not only a clear display screen cannot be obtained, but also other electronic parts may be adversely affected, and therefore they must be removed.

Conventionally, Freon 113, 1,1,1-trichloroethane, etc. have been used to remove the liquid crystal adhering to the substrate, etc., but these are environmental pollution problems such as destruction of the ozone layer in the sky and toxicity. Problem and its use is being limited. Further, although washing with sugars and alcohols has also been carried out, these have no problems of environmental pollution and toxicity, but they are not sufficient in removing liquid crystal stains.

Therefore, an object of the present invention is that liquid crystals adhering to glass substrates, jigs, tools, etc. or stains containing them have excellent removability and rinsing properties, and are safe and have no environmental pollution such as CFCs. An object is to provide a water-based cleaning composition.

[0005]

As a result of intensive studies, the present inventors have found that an aqueous detergent composition containing water containing two specific alkylene oxide compounds achieves the above object. I found out that. The present invention has been made based on the above findings, and provides the following aqueous detergent composition for liquid crystal.

(A) an alkylene oxide compound selected from the group consisting of compounds represented by the general formulas (I), (II) and (III) of the following chemical formula 3 (same as the chemical formula 1), and (B) the following chemical formula 4 ( The same as in Chemical Formula 2) and (C) water are contained, and the mixing ratio (weight ratio) of the component (A) and the component (B) is (A) component /
(B) component = 9/1 to 1/9, the total content of the (A) component and the (B) component is 10 to 85% by weight,
Aqueous detergent composition for liquid crystal wherein the content of the component (C) is 15 to 90% by weight [however, the component (A) is
1 in the general formula (I) in which Y is a hydrogen atom and R ^{1 is} a carbon atom.
A compound having a prime number of 10 to 18 and the above (B)
The component is a compound in which Y in the general formula of the following chemical formula 2 is a hydrogen atom.
Unless it is a thing] .

[0007]

Embedded image

[0008]

Embedded image Hereinafter, the aqueous cleaning composition for liquid crystals of the present invention will be described in detail. In the alkylene oxide compound of the component (A) of the present invention, the general formula (I), (II) and (III)
It is necessary that R ¹ therein is a hydrocarbon residue having 6 to 18 carbon atoms. When the carbon number is less than 6, the oil solubility is low and the affinity of the liquid crystal with the organic stain is lowered. When the carbon number is more than 18, the liquid crystal stain removability is lowered with the increase in viscosity. Further, there is a problem that the alkylene oxide adduct is deposited in the winter.

R ¹ is preferably an alkyl group having 6 to 18 carbon atoms or an aromatic hydrocarbon residue, particularly an alkyl group having 8 to 14 carbon atoms or an allylalkyl group. Further, m, n in the general formulas (I), (II) and (III) of the above chemical formula 3,
l and p are m = 1 to 30, n = 0 to 30, and l = in order to secure the affinity and penetrability of the liquid crystal for organic stains.
0-30, p = 0-30, m + n ≦ 30, l + p ≦ 3
It is necessary that the number be 0, and particularly, those in which m + n and l + p are 3 to 15 respectively exhibit excellent effects. Further, as Y, an alkyl group having 1 to 4 carbon atoms is particularly preferable.

Specific examples of the above-mentioned component (A) include octyl alcohol, lauryl alcohol, oleyl alcohol, higher alcohols such as Guerbet alcohol having 18 carbon atoms, nonylphenol, phenols such as styrenated phenol, octyl acid, lauric acid, Oleic acid, stearic acid, higher fatty acids such as gerberic acid having 18 carbon atoms, hexylamine, laurylamine, oleylamine, gerbereamine having 18 carbon atoms, and alkylene (ethylene, propylene or butylene) oxide, alone or in combination. Is mentioned. These alkylene oxides may be added in blocks or randomly.

Further, compounds in which the terminal hydroxyl groups of these alkylene oxide adducts are methylated, ethylated or butylated with alkyl chloride or the like can be mentioned. Further, an alkylene oxide is added alone or in combination with an alcohol having 1 to 4 carbon atoms, and the addition product is further added to have 6 to 1 carbon atoms.
The compound esterified with the fatty acid of 8 is also mentioned. The component (A) can be blended alone or in combination of two or more.

The alkylene oxide compound of the component (B) of the present invention represented by the above chemical formula 4 is, for example, a straight chain or branched chain alkyl such as methyl alcohol, ethyl alcohol, propyl alcohol, butyl alcohol and isobutyl alcohol. Alcohol having a group, alkylene (ethylene, propylene or butylene)
Examples include oxides alone or in combination with addition,
Furthermore, compounds in which the terminal hydroxyl groups of these alkylene oxide adducts are methylated, ethylated or butylated with alkyl chloride or the like can be mentioned. The number of moles of alkylene oxide added to these compounds (q and r in the above chemical formula 4) is q = 1 to 6, r = 0 to 4, q + r = 1 to 10.
The range of q + r is preferably 2-6.

When q + r is 0, the solubility in water is insufficient, and when q + r exceeds 10, the viscosity increases when compounded with the above-mentioned component (A), and the viscosity increases in a narrow gap portion of the liquid crystal substrate. The cleanability of the adhered dirt is reduced. The component (B) can be blended alone or in combination of two or more. In the component (A) and the component (B), the compounding ratio (weight ratio) of the component (A) and the component (B) is (A) component / (B) component = 9/1 to 1/9, preferably Is 7/1 to 1/7, and the total content of the component (A) and the component (B) is 10 to 85% by weight in the composition, preferably 30 to
It is blended so as to be 60% by weight (hereinafter, simply indicated by "%").

By combining the above-mentioned component (A) and the above-mentioned component (B) in the above-mentioned mixing ratio, the viscosity of the product is lowered as compared with the case where the component (A) is used alone, and the cleaning property, particularly the liquid crystal substrate Improves the cleanability of dirt adhering to narrow gaps. In addition, if the total content of the above-mentioned component (A) and the above-mentioned (B) component is less than 10%, the detergency and its sustainability are insufficient, and even if it exceeds 85%, the cost-by-performance is compounded. It cannot be said that it is effective from the viewpoint of.

The component (C) of the present invention, water, is added to the composition in an amount of 15 to 90%, preferably 15 to 60%. The aqueous detergent composition for liquid crystal of the present invention further comprises (D)
A surfactant can be blended, and the detergency is further increased by blending the component (D). As the component (D), any of an anionic activator, a cationic activator, a nonionic activator and a zwitterionic activator can be used. Specifically, fatty acid salts, higher alcohol sulfuric acid ester salts, liquid fatty oil sulfuric acid ester salts, sulfuric acid salts of aliphatic amines and aliphatic amides, fatty alcohol phosphoric acid ester salts, dibasic fatty acid ester sulfone salts, and fatty acid amides. Anionic activators such as sulfonates, alkylallyl sulfonates, formalin-condensed naphthalene sulfonates; aliphatic amine salts, fourth
Cationic activators such as primary ammonium salts and alkylpyridinium salts; polyoxyalkylene alkyl ethers, polyoxyalkylene alkylphenol ethers, polyoxyalkylene alkylamines, polyoxyalkylene alkyl esters, sorbitan alkyl esters, polyoxysorbitan Examples thereof include nonionic activators such as alkyl esters; and zwitterionic activators such as alkylbetaine, alkyldimethylamine oxide, and alkylalanine. Here, the polyoxyalkylene refers to a polymer of ethylene oxide, propylene oxide or butylene oxide. Among these surfactants, particularly nonionic surfactants having an average HLB of 4 to 18 exhibit excellent effects.

The above component (D) is contained in the composition in an amount of 0.01 to
20%, especially 0.5 to 10% is preferable. If the blending amount is less than 0.01%, the special effect due to the addition of the surfactant does not appear, and the blending amount is 20%.
Even if it exceeds, the improvement of the effect is hardly recognized. In addition, the aqueous detergent composition for liquid crystal of the present invention may have a chelating force of aminocarboxylic acid salts such as hydroxyethylaminodiacetic acid and ethylenediaminotetraacetic acid, if necessary, as long as the effects of the present invention are not impaired. A compound having, a hydrocarbon such as alkylbenzene or olefin, an ester such as methyl coconut fatty acid or benzyl acetate, an antioxidant, a corrosion inhibitor and the like can be appropriately added.

The aqueous detergent composition for liquid crystals of the present invention can be produced by mixing the above-mentioned components (A), (B) and (C) in a conventional manner. The method of washing the liquid crystal using the aqueous liquid cleaning composition for liquid crystals of the present invention is not particularly limited, for example ultrasonic cleaning or immersion cleaning using the aqueous liquid cleaning composition for liquid crystals of the present invention, and finally a solvent Alternatively, a method of continuously performing a method such as rinsing with warm water is an efficient cleaning method. Also, the vibration method,
Various cleaning methods such as a spray method may be used.

[0018]

The water-based cleaning composition for liquid crystals of the present invention is used for cleaning glass substrates, jigs, tools, etc. at the time of manufacturing a liquid crystal display device. Remove dirt. Further, after cleaning, the aqueous liquid cleaning composition for liquid crystals of the present invention which remains on the surface of the object to be cleaned is washed away by rinsing the object to be cleaned with water or the like.

[0019]

EXAMPLES Hereinafter, the present invention will be described in more detail with reference to Examples and Comparative Examples, but the present invention is not limited thereto. Examples 1 to 10 and Comparative Examples 1 to 5 A glass plate having a thickness of 1.1 mm is provided with a spacer, and another glass plate is covered with the spacer to form a sandwich structure having a gap of 10 to 20 μm. (ZLI-156
(5, manufactured by Merck Japan Co., Ltd.) is sealed to prepare a cell.

This cell was immersed in each cleaning solution having the composition shown in Table 1, Table 2 and Table 3 below at 40 ° C. for 1 minute, and then ultrasonically cleaned in the same solution for 5 minutes. Then, the residual liquid crystal on the glass plate of the cell and around the cell was measured by a polarization microscope, and the removal property (cleanability) of liquid crystal stains was evaluated according to the following evaluation criteria. Next, the cell was taken out from the cleaning liquid, immersed in an ion exchange tank at 40 ° C. for 1 minute, the rinsing property was measured with a polarizing microscope, and evaluated according to the following evaluation criteria. The results are shown in Table 1, Table 2 and Table 3 below.

Criteria for evaluation of liquid crystal stain removability ⊚: Very good with no residual liquid crystal. ◯: Good with almost no liquid crystal residue. Δ: The liquid crystal remains slightly, which is rather bad. X: Liquid crystal remained and was bad.

Evaluation criteria for rinsing property ⊚: Very good rinsing property. ◯: Rinseability is good. B: Some cleaning liquid that cannot be rinsed adheres. X: A large amount of cleaning liquid that cannot be rinsed adheres.

[0023]

[Table 1]

[0024]

[Table 2]

[0025]

[Table 3]

[0026]

EFFECT OF THE INVENTION The aqueous cleaning composition for liquid crystal of the present invention is excellent in the removability of the liquid crystal adhering to the glass substrate, the jig and the tool or the dirt containing the same, and the rinsing property, and does not use CFCs or the like. Therefore, it does not pollute the environment and is highly safe.

Claims (2)

(57) [Claims] 1. (A) General formulas (I) and (II) of the following chemical formula 1.
And an alkylene oxide compound selected from the group consisting of compounds represented by (III), (B) an alkylene oxide compound represented by the following chemical formula 2 and (C) water, and the above (A) component and the above (B) component The blending ratio (weight ratio) with (A) component / (B) component = 9/1 to 1/9,
The total content of the component (A) and the component (B) is 10
Is 85% by weight, and the content of the component (C) is 15%.
90% by weight of an aqueous detergent composition for liquid crystal [provided that the above
The component (A) is a hydrogen atom represented by Y in the general formula (I) of the following chemical formula 1.
A compound in which R ¹ has 10 to 18 carbon atoms
And the component (B) is Y in the general formula of the following chemical formula 2.
Except when the compound is a hydrogen atom] . Embedded image Embedded image 2. Further, (D) a surfactant 0.01 to 20.
The aqueous detergent composition for liquid crystal according to claim 1 , which contains a weight percentage.