JP2967595B2 - Aqueous liquid detergent composition for liquid crystal cell - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an aqueous liquid detergent composition for a liquid crystal cell using a glass substrate or the like.

[0002]

2. Description of the Related Art A liquid crystal cell using a glass substrate has a thickness of 10 μm.
The following two glass substrates are adhered to each other with an adhesive so as to be hollow inside while maintaining an appropriate space therebetween, and a liquid crystal is sealed in the hollow portion. Character and image display electrodes composed of a transparent conductive film are provided on the inner surfaces of the two glass substrates, and characters and images can be displayed by applying a control electric signal to these electrodes.

The liquid crystal cell originally has low power consumption, and as a result of technical improvements such as high contrast in recent years, it has become possible to display more delicate and diverse images such as for computer terminal displays and televisions. Its use is expanding.

However, in order to display a delicate image,
Thousands of electrode terminals formed on the end face of the glass substrate to apply the above-mentioned electric control signal must be arranged in one display cell at intervals of 3 to 10 / mm. Is progressing. To give an example of the arrangement of these electrode terminal wires, for a conductor width of 100 to 300 μm of the conductor terminal portion,
The terminal wiring interval for electrically insulating and insulating thousands of conductor terminals from each other must be extremely narrow, 10 to 30 μm, in order to maintain image display quality.

For this reason, it is not easy to maintain the insulation between the terminal wirings, and even if a small amount of contaminant is present on the terminal surface, an image display defect due to poor insulation may occur,
When the humidity is applied, there is a problem that a disconnection accident occurs due to electrolytic corrosion and the display function of the liquid crystal cell is destroyed.

Particularly, in a liquid crystal cell, the liquid crystal sucked between the substrates outside the liquid crystal chamber at the time of filling the liquid crystal cell causes contamination.

In manufacturing a liquid crystal cell, the upper and lower substrates are bonded together at their peripheral edges with an adhesive so as to seal the liquid crystal between the two substrates on which the transparent electrodes are formed. To form an empty liquid crystal cell. In this empty cell, the opening is immersed in a liquid crystal substance in a vacuumed injection chamber, and then the injection chamber is opened to the atmosphere, whereby the liquid crystal substance is sucked between the substrates (liquid crystal chamber) and the opening is sealed. As a result, a liquid crystal cell in which a liquid crystal substance is sealed is formed between the substrates.

[0008] However, it is inevitable that a gap is formed outside the bonded portion of the two liquid crystal cell substrates so that the liquid crystal cell substrates face each other with a small gap. Therefore, at the time of injecting the liquid crystal into the empty cell, the liquid crystal enters the gap due to capillary action. If this liquid crystal is left as it is, the liquid crystal easily dissolves pollutants in the air and causes insulation failure. Therefore, it is necessary to wash and remove the liquid crystal. However, since the gap of this void portion is as narrow as 10 μm or less, it is difficult to wash and remove the entered liquid crystal.

For the reasons described above, as a cleaning agent for a completed liquid crystal cell, a chlorofluorocarbon-based solvent or a chlorofluorocarbon-based solvent which has a high level of cleaning ability and does not leave contaminated residues has been used. . However, while these solvents have excellent cleaning performance, they have a serious problem in environmental safety, and in recent years, demands for aqueous cleaning agents have been increasing.

[0010]

SUMMARY OF THE INVENTION The present invention provides a cleaning composition which exhibits extremely excellent cleaning performance for liquid crystal cells and does not cause environmental pollution.

[0011]

The aqueous liquid detergent for liquid crystal cells of the present invention is characterized by containing the following components (a) to (c). (a) A nonionic surfactant represented by the following general formula (I) : 10 to 60% by weight . (b) a silicate represented by the following general formula (II) :
1-20% by weight . (c) Chelating agent : 0.05 to 20% by weight .

[0012]

Embedded image (R _1: alkyl or alkenyl group having 6 to 12 carbon atoms n: 2 to 4 m: represents the number of added moles of alkylene oxide, 5 to 1
Number five . However, the same alkylene oxide may be added alone, or two or more alkylene oxides may be added as a mixture. )

## STR00005 ## aM ₂ O · bSiO ₂ ... (II)

Hereinafter, the present invention will be described in more detail. The nonionic surfactant of the component (a) is an alkylene oxide adduct of an alkyl or alkenyl phenol,
The alkyl or alkenyl group preferably has 8 to 9 carbon atoms.

As the alkylene oxide, ethylene oxide, propylene oxide, and butylene oxide are added, and ethylene oxide or propylene oxide is particularly preferable. One of these alkylene oxides may be added alone, or two or more of them may be added as a mixture. In the case of mixed addition, block addition or random addition may be used.

The number of moles of the alkylene oxide added is 5 to
It is 15. As the silicate of the component (b), those represented by the following formula 5 are suitable.

[0016]

Embedded image _{aM 2 O · bSiO 2 (M} : Na, alkali metal salts of K such a: 1 to 3, preferably 1 to 2 b: 1 to 5, preferably 1~2 b / a: 0.5 ~1 )

As the chelating agent of the component (c), ethylenediaminetetraacetic acid, diethylenetriaminepentaacetic acid, nitrilotriacetic acid, hydroxyethanediphosphonic acid or salts thereof are preferable.

The aqueous liquid detergent composition for a liquid crystal cell of the present invention is prepared by blending the above components (a), (b) and (c). Here, the nonionic surfactant of the component (a) is preferably blended in an amount of 10 to 60% by weight, more preferably 20 to 60% by weight.

The silicate of the component (b) is preferably blended in an amount of 1 to 20% by weight, more preferably 5 to 20% by weight. Further, the chelating agent of the component (c) is preferably blended in an amount of 0.05 to 20% by weight, more preferably 1.0 to 20% by weight.

The aqueous liquid detergent composition for a liquid crystal cell of the present invention
Is usually prepared as a transparent composition of 5 to 70% by weight by diluting it with water, and diluting it by about 10 times with water to obtain a cleaning solution.
At that time, if necessary, a liquid stabilizer such as ethylene glycol, propylene glycol, methanol, ethanol, propanol, toluene sulfonate, xylene sulfonate can be blended, and a rust inhibitor such as benzotriazole, Preservatives such as benzoates can also be added.

[0021]

According to the aqueous liquid detergent composition for a liquid crystal cell of the present invention, by using a specific nonionic surfactant, a silicate and a chelating agent together, an aqueous cleaning liquid can be used to contaminate the liquid crystal cell. Can be effectively cleaned.

[0022]

EXAMPLES Each cleaning agent was prepared in Examples 1 to 43 described later, and the detergency was evaluated by the following evaluation method.

[Method for Evaluating Detergency] A liquid crystal is applied to the voids of a glass substrate liquid crystal cell, and left still for 5 minutes. Confirm that the voids are filled with the liquid crystal with a polarizing microscope (20 times), and use it as a washed sample. Each of the prepared cleaning agents is diluted 10 with pure water to obtain a cleaning solution.

The cleaning liquid is kept at 40 ° C. (± 0.5 ° C.) in a thermostat, a cell to be cleaned is put in, and immersion cleaning is performed for 5 minutes. After washing, put in pure water at 25 ° C, shake and rinse 10 times, and air dry.

The gap is observed with a polarizing microscope (× 20), and the degree of cleaning is evaluated according to the following evaluation criteria. Here, three or more points are passed. 5: thoroughly washed 4: very good 3: fairly good 2: bad 1: hardly washed

Example 1 Detergent compositions Nos. 1 to 9 shown in Tables 1 and 2 below were prepared, diluted 10-fold with water, and evaluated for detergency. Hereinafter, the nonionic surfactant is represented by a skeleton structure (phenol or the like) to which the alkylene oxide is added and the number of moles of the alkylene oxide added. EOp indicates the average number of moles of ethylene oxide added. EDTA stands for ethylenediaminetetraacetic acid.

[0027]

TABLE 1 Common composition nonionic surfactants (described in Table 2) 20 wt% ortho sodium silicate _{5wt% (2Na 2 O · SiO} 2 · xH 2 O, b / a = 0.5) EDTA-2Na 5wt % Water balance

[0028]

Table 2: Types of nonionic surfactants and evaluation results No. Nonionic surfactant detergency 1 Nonylphenol EOp = 54 2 Nonylphenol EOp = 104 3 Nonylphenol EOp = 1544 Octylphenol EOp = 54 5 Octylphenol EOp = 10 5 6 Octylphenol EOp = 15 4 7 * Lauryl alcohol EOp = 10 28 * Laurylamine EOp = 10 2 9 * Lauryl monoethanolamide EOp = 10 2 * No. 7, 8, 9 are comparative examples

Example 2 Detergent compositions of Nos. 10 to 16 shown in Tables 3 and 4 below were prepared, diluted 10-fold, and evaluated for detergency.

[0030]

Table 3: Common composition octylphenol EOp = 10 20 wt% Alkaline agent (described in Table 4) 5 wt% EDTA-2Na 5 wt% water balance

[0031]

Table 4 Table 4: Type of alkali agents, the evaluation results No. alkaline agent detergency 10 ortho sodium silicate _{2Na 2 O · SiO 2 · xH} 2 O 5 11 sesquicarbonate sodium silicate _{3Na 2 O · 2SiO 2 · xH} 2 O 4 12 Sodium metasilicate Na ₂ O ・ SiO ₂・ xH ₂ O 4 13 * Caustic soda 2 14 * Monoethanolamine 2 15 * Diethanolamine 2 16 * Triethanolamine 1 *) No.13,14,15,16 are comparative examples

Example 3 Detergent compositions Nos. 17 to 20 shown in Tables 5 and 6 below were prepared, and diluted 10 times with water to evaluate the detergency.

[0033]

Table 5: Common composition octylphenol EOp = 10 20 wt% Sodium orthosilicate 5 wt% Chelating agent (described in Table 6) 5 wt% water balance

[0034]

Table 6: Types of chelating agents and evaluation results No. Chelating agent detergency 17 nitrilotriacetic acid-3Na 518 diethylenetriamine pentaacetic acid-5Na 519 ethylenediamine tetraacetic acid-4Na 520 hydroxyethanediphosphonic acid-4Na 5

Example 4 Detergent compositions of Nos. 21 to 24 shown in Tables 7 and 8 below were prepared and diluted 10 times with water to evaluate the detergency.

[0036]

[Table 7] Table 7: Common composition octylphenol EOp = 10 Listed in Table 8 Orthosilicate sodium 5wt% EDTA-2Na 5wt% water balance

[0037]

Table 8: Compounding amount of octylphenol EOp = 10, evaluation result No. Compounding amount of octylphenol EOp = 10 Detergency 21 10 wt% 4 22 20 wt% 5 23 50 wt% 5 24 60 wt% 5

Example 5 Detergent compositions of Nos. 25 to 29 shown in Tables 9 and 10 below were prepared, and diluted 10 times with water to evaluate the detergency.

[0039]

Table 9: Common composition octylphenol EOp = 10 20 wt% sodium orthosilicate described in Table 10 EDTA-2Na 5 wt% water balance

[0040]

[Table 10]

Example 6 Detergent compositions Nos. 30 to 34 shown in Tables 11 and 12 below were prepared, and diluted 10 times with water to evaluate the detergency.

[0042]

Table 11: Common composition octylphenol EOp = 10 20 wt% Sodium orthosilicate 5 wt% EDTA-2Na Water balance described in Table 10

[0043]

[Table 12]

Example 7 Detergent compositions of Nos. 35 to 36 shown in Tables 13 and 14 below were prepared, diluted 10-fold, and evaluated for detergency.

[0045]

Table 13: Nonionic surfactants of common composition (types and blending amounts are listed in Table 14) Sodium orthosilicate 5wt% EDTA-2Na 5wt% water The balance

[0046]

Table 14: Types of nonionic surfactants and evaluation results No. Nonionic surfactant detergency 35 Octylphenol EOp = 8 10 wt% + 5 Octylphenol EOp = 10 10 wt% 36 Octylphenol EOp = 15 · POP = 3 * ¹ 20wt% 4 * 1) Ethylene oxide 15mol and propylene oxide 3
Mole mixed block adduct

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-54-46207 (JP, A) JP-A-54-114509 (JP, A) JP-A-1-32090 (JP, A) 245496 (JP, A) JP-A-3-70800 (JP, A) (58) Fields investigated (Int. Cl. ⁶ , DB name) C11D 1/72 C11D 3/08 C11D 3/30 C11D 3/36 C11D 7/14 C11D 7/32 C11D 7/36 WPI / L (QUESTEL)

Claims (2)

(57) [Claims] (1) A nonionic surfactant represented by the following general formula (I) : 10 to 60% by weight (R _1: alkyl or alkenyl group having 6 to 12 carbon atoms n: 2 to 4 m: represents the number of added moles of alkylene oxide, 5 to 1
Number five . However, the same alkylene oxide may be added alone, or two or more alkylene oxides may be added as a mixture. ) (B) Formula (II)
A silicate represented by the formula: 1 to 20% by weight aM ₂ O.bSiO ₂ ... (II) (c) chelating agent : an aqueous liquid detergent composition for a liquid crystal cell, containing 0.05 to 20% by weight . 2. The aqueous liquid detergent for a liquid crystal cell according to claim 1, wherein the chelating agent is one or more of nitrilotriacetic acid, ethylenediaminetetraacetic acid, diethylenetriaminepentaacetic acid, hydroxyethanediphosphonic acid, and salts thereof. Composition.