KR20100029703A - Detergent compositions for cleaning liquid crystal material and method of cleaning liquid crystal panel - Google Patents

Abstract

PURPOSE: A detergent composition for cleaning a liquid crystal material is provided to ensure high detergency about liquid crystal contamination as well as to reduce draining load in environment. CONSTITUTION: A detergent composition for cleaning a liquid crystal material comprises an aromatic compound represented by chemical formula 1. In chemical formula 1, R^1 is OCH3 or CH2OCH3, and R^2 is CH3, OCH3 or CH2OCH3. The detergent composition is formed by mixing an aromatic compound represented by chemical formula 1 with water; or at least one kind selected form the group consisting of a compound represented by chemical formula 2, non-ionic surfactant with HLB of 11 or more, and aprotic polar organic solvent in a mixture of the aromatic compound represented by chemical formula 1 with water.

Description

Detergent composition for liquid crystal removal and cleaning method of liquid crystal panel {DETERGENT COMPOSITIONS FOR CLEANING LIQUID CRYSTAL MATERIAL AND METHOD OF CLEANING LIQUID CRYSTAL PANEL}

This invention relates to the detergent composition for liquid crystal removal and the washing | cleaning method of a liquid crystal panel.

This application claims priority based on Japanese Patent Application No. 2008-229785 for which it applied to Japan on September 8, 2008, and Japanese Patent Application No. 2009-125163 for which it applied in Japan on May 25, 2009, The content here It is used for.

In a liquid crystal panel, a pair of glass substrates on which an electrode and an alignment film are formed are usually bonded together with an adhesive, leaving some openings to form a liquid crystal chamber, a liquid crystal is injected into the liquid crystal chamber, and the opening is sealed with a sealing agent. After that, washing is performed and a deflection plate is adhered to the surface of the pair of glass substrates, respectively.

In such manufacture, it is inevitable that gaps (narrow portions) are generated due to a narrow gap between the glass substrates facing each other on the outer side (the opposite side to the liquid crystal chamber side) of the pair of glass substrates. When the liquid crystal is injected into the liquid crystal chamber, the liquid crystal enters the narrow gap by capillary action and adheres.

If the liquid crystal attached to the narrow gap (hereinafter referred to as "liquid crystal contamination") is left as it is, the residue of the liquid crystal contamination acts as a releasing agent, so that the deflection plate is peeled off and the connection of the driver terminals is lost in the subsequent manufacturing process. It may lead to various troubles such as abnormality of the driver underfill interface and peeling of the temporary peelable coating film used for the thinning method of the substrate.

Therefore, in the washing | cleaning in manufacture of a liquid crystal panel, it is necessary to wash | clean and remove the said liquid crystal contamination with high cleanliness.

Since the liquid crystal contamination is generally a polarized compound, the interaction between molecules is strong and high hydrophobicity, it is known that both dispersibility or solubility in an aqueous solvent is low.

In order to wash | clean and remove this liquid-crystal contamination, the hydrocarbon solvent, the specific polyoxyalkylenedialkyl ether compound,

R ¹¹ -C ₆ H ₄ -C _p H _2p -O- (C _q H _2q O) _r -H

[Wherein, R ¹¹ is a hydrogen atom, an alkyl group of 1 to 3 carbon atoms or an alkenyl group of 2 or 3 carbon atoms, p is an integer of 0 or 1 to 2, q is an integer of 2 to 4, r is 0 or 1 to 4 And an integer of r and r C _q H _2q O may be the same or different.]

The detergent composition which contains the aromatic monocyclic compound represented by is proposed (refer patent document 1).

Furthermore, the C8-C20 hydrocarbon compound, the alkylene oxide adduct of specific heavy chain branched primary alcohol,

R ¹² O (AO) _k R ¹³

[Wherein, R ¹² is an alkyl group or phenyl group or benzyl group having 1 to 6 carbon atoms, R ¹³ is a hydrogen atom or an alkyl group having 1 to 6 carbon atoms, k is a number from 1 to 5, and AO is 2 to 4 carbon atoms An oxyalkylene group]

The aqueous liquid detergent composition for liquid crystal panels containing the alkylene oxide adduct represented by this and a predetermined amount of water is proposed (refer patent document 2).

Prior art literature

Patent Literature

Patent Document 1: Japanese Patent Application Laid-Open No. 10-114899

Patent Document 2: Japanese Patent Application Laid-Open No. 2004-2691

However, in the detergent compositions described in Patent Literatures 1 and 2, the cleaning power against the liquid crystal contamination adhering to a narrow gap of 2 to 5 μm between a pair of glass substrates of the liquid crystal panel is still insufficient.

In addition, in the invention described in Patent Literature 1, a detergent composition in which aliphatic hydrocarbon is used as a main ingredient, and a method of directly immersing the object to be washed and washing in the stock solution of the detergent composition are disclosed, respectively. However, in the method using the said detergent composition, organic solvents, such as an aliphatic hydrocarbon, are used in large quantities, and there exists a problem of high drainage load to an environment.

Moreover, although the example in which the compounding ratio of water is 77 mass% or less is disclosed in the detergent composition of patent document 2, while further reducing the compounding ratio of components other than the number, such as an organic solvent, suppressing the drainage load to the environment, The improvement of the cleaning power against liquid crystal contamination is further required.

This invention is made | formed in view of the said situation, and makes it a subject to provide the detergent composition for liquid crystal removal and the cleaning method of a liquid crystal panel which have high cleaning power with respect to liquid crystal contamination, and can reduce the drainage load to an environment. .

MEANS TO SOLVE THE PROBLEM As a result of earnestly examining, the present inventors provide the following means in order to solve the said subject.

That is, the detergent composition for liquid crystal removal of this invention contains the aromatic compound represented by following General formula (1), It is characterized by the above-mentioned.

[Formula 1]

[Wherein, R ¹ represents OCH ₃ or CH ₂ OCH ₃ and R ² represents CH ₃ , OCH ₃ or CH ₂ OCH ₃ ]

It is preferable that the detergent composition for liquid crystal removal of this invention mixes the aromatic compound represented by the said General formula (1), and water.

In addition, the detergent composition for removing liquid crystal of the present invention, in addition to the aromatic compound represented by the formula (1) and water, the compound represented by the following formula (2), HLB is 11 or more nonionic surfactant and non-protic polar organic It is preferable to further mix at least 1 sort (s) chosen from the group which consists of a solvent.

[Formula 2]

[Wherein, R ³ is an alkyl group having 1 to 6 carbon atoms, a phenyl group or a benzyl group, and n is a number having 0 to 50]

Moreover, the washing | cleaning method of the liquid crystal panel of this invention is characterized by using the detergent composition for liquid crystal removal of the said invention.

According to the detergent composition for liquid crystal removal of this invention, the washing | cleaning power with respect to liquid crystal contamination is high, and the drainage load to an environment can be reduced.

Moreover, according to the washing | cleaning method of the liquid crystal panel of this invention, liquid crystal contamination adhered to the gap of a liquid crystal panel can fully be removed, and the drainage load to an environment can be reduced.

≪Detergent composition for liquid crystal removal≫

The detergent composition for liquid crystal removal of this invention contains the aromatic compound (henceforth "(Sa1) component") represented by the said General formula (1).

<(Sa1) component>

In Formula 1, R ¹ denotes an OCH ₃ or CH ₂ OCH _3.

R ² represents CH ₃ , OCH ₃ or CH ₂ OCH ₃ .

The bonding position of R ^{2 may be any} of the o-position, the m-position, or the p-position of the benzene ring, and the p-position is further improved because the cleaning power for liquid crystal contamination is improved and industrially readily available. Is preferred.

Specific examples of the (Sa1) component include o-methoxytoluene, m-methoxytoluene, p-methoxytoluene, 1,2-dimethoxybenzene, 1,3-dimethoxybenzene, 1, 4-dimethoxybenzene, o-methoxy-α-methoxytoluene, m-methoxy-α-methoxytoluene, p-methoxy-α-methoxytoluene, α-methoxy-o-xylene, α- Methoxy-m-xylene, (alpha)-methoxy-p-xylene, o-xylene glycol dimethyl ether, m-xylene glycol dimethyl ether, and p-xylene glycol dimethyl ether are mentioned.

(Sa1) component should just have two substituents of said R <^1> and said R <^2> , Especially, since the washing | cleaning power with respect to liquid crystal contamination improves more, Solubility to water (25 degreeC) is 1 g / 100 g aqueous solution or less It is more preferable that it is 0.5 g / 100 g aqueous solution or less, and it is still more preferable that it is 0.1-0.5 g / 100 g aqueous solution.

(Sa1) A component may be used individually by 1 type and may use 2 or more types together. It is preferable that it is 1 mass% or more, and, as for the content rate of (Sa1) component in the detergent composition for liquid crystal removal of this invention, it is more preferable that it is 5 mass% or more. If the content rate of (Sa1) component is more than a lower limit, the washing | cleaning power with respect to liquid crystal contamination will improve more.

On the other hand, 100 mass% may be sufficient as the upper limit of the content rate of (Sa1) component, It is preferable that it is 90 mass% or less, It is more preferable that it is 60 mass% or less, It is further more preferable that it is 50 mass% or less, It is 20 mass% or less Particularly preferred. When the content ratio of the (Sa1) component is preferably 90% by mass or less, more preferably 60% by mass or less, even more preferably 50% by mass or less, the drainage load to the environment can be further reduced, and particularly preferably When the concentration is 20% by mass or less, the cleaning power against liquid crystal contamination can be sufficiently obtained, and the drainage load to the environment can be further reduced.

<Optional ingredient>

The detergent composition for liquid crystal removal of this invention may contain other components other than the said (Sa1) component.

As other components other than (Sa1) component, water, surfactant, an organic solvent are mentioned, for example.

In addition, in this invention, a "surfactant" means the compound whose surface tension in 25 degreeC when diluted to 1 mass% with pure water is 50 mN / m or less. Surface tension is a value measured using a platinum plate based on Wilhelmy method using a surface tension meter.

In the present invention, "pure water" means that impurities are removed from water by physical treatment or chemical treatment. As pure water, deionized water, distilled water, etc. are mentioned, for example.

(Surfactants)

As surfactant, a nonionic surfactant, an anionic surfactant, a cationic surfactant, and an amphoteric surfactant can be used, for example.

Especially, the compatibility of (Sa1) component and water becomes high, and what is easy to obtain the effect which prevents cloudiness made by mixing (Sa1) component and water on the conditions of high temperature storage, such as summer, a liquid crystal panel Nonionic surfactants are preferable because corrosion of the electrode due to the supply of electricity to the electrode hardly occurs. Especially, since the effect which raises the cloud point of what mixes (Sa1) component and water is easy to be acquired especially, 11 or more nonionic surfactant of HLB is more preferable, and nonionic surfactant of 12 or more HLB is more preferable. And a nonionic surfactant having an HLB of 14 to 20 is particularly preferable.

Specifically, HLB is 11 or more polyoxyethylene alkyl ether, etc. are mentioned.

In addition, in this invention, "HLB" means that it is the relative strength of the hydrophilicity and lipophilic which the molecule | numerator of a surfactant has, and means what showed the hydrophilic lipophilic balance quantitatively. Values obtained by Griffin's method (see Yoshida, Shindou, Ogaki, and Yamanaga co-authored, "New Surfactant Handbook", KKK, 1991, p. 234).

It is preferable that it is 30 degreeC or more, and, as for the cloud point of what mixes (Sa1) component and water, it is more preferable that it is 40 degreeC or more. If a cloud point is more than a lower limit, the detergent composition which shows a uniform and transparent appearance will become easy to be prepared.

In this invention, a "cloud point" mix | blends a predetermined amount of detergent composition in the temperature range of 0-30 degreeC, and after preparing a uniform and transparent solution, the said solution is accommodated in a predetermined container, and it is a water bath. It is immersed in water and raises the temperature of a water bath, and says the temperature (degreeC) of the water bath at the time when the said solution starts to become cloudy. The temperature of a water bath can be measured by reading the scale of a standard thermometer, for example.

(Organic solvent)

As the organic solvent, a polar organic solvent may be used or a nonpolar organic solvent may be used. Especially, since the compatibility of (Sa1) component and water becomes high and the liquid stability (uniformity, transparency) of what mixes (Sa1) component and water improves, it is preferable to use a polar organic solvent.

The polar organic solvent may be a plotonic polar organic solvent or an aprotic polar organic solvent. Especially, since a liquid stability (uniformity and transparency) of what mixes (Sa1) component and water improves more, an aprotic polar organic solvent is especially preferable.

As an aprotic polar organic solvent, for example, an oxygen atom (= in a molecule such as dimethyl sulfoxide (DMSO), N, N-dimethylformamide (DMF), acetone, N-methylpyrrolidone, 2-butanone, etc. Having O); Acetonitrile and the like.

Among them, as the aprotic polar organic solvent, since the cleaning power against liquid crystal contamination is further improved, one having an oxygen atom (= O) in the molecule is preferable, and DMSO, DMF and acetone are particularly preferable, and dimethyl sulfoxide ( DMSO) is most preferred.

As a plutonic polar organic solvent, For example, C1-C4 monohydric alcohol, such as methanol, ethanol, 1-propanol, 2-propanol, 1-butanol, tert-butanol; Monocarboxylic acids having 1 to 4 carbon atoms such as acetic acid, formic acid and butyric acid; Glycool ether etc. are mentioned.

As glycoether, For example, Ethylene glycol ether in which one terminal is an aliphatic hydrocarbon group or an aromatic hydrocarbon group, and the other terminal is a hydrogen atom; Propylene glycol alcohols, wherein one end is an aliphatic hydrocarbon group or an aromatic hydrocarbon group, and the other end is a hydrogen atom; And dialkyl glycol ethers in which both terminals are alkyl groups.

Among the above, as the plutonic polar organic solvent, a compound represented by the following general formula (2) is particularly preferable because the cleaning power against liquid crystal contamination is high and the drainage load to the environment is low.

[Formula 2]

[Wherein R ³ is an alkyl group having 1 to 6 carbon atoms, a phenyl group or a benzyl group, and n is a number of 0 to 50]

In said Formula (2), R <^3> is a C1-C6 alkyl group, a phenyl group, or a benzyl group.

When n = 0, the compound represented by Formula (2) is monohydric alcohol. In this case, R ³ is preferably an alkyl group having 1 to 6 carbon atoms, more preferably methanol, ethanol, 1-propanol, 2-propanol, 1-butanol, tert-butanol, and still more preferably ethanol.

In the case of n = 1 to 50, the compound represented by the formula (2) is ethylene glycol alcohol. In this case, the alkyl group of R ³ is preferably 4 to 6 carbon atoms because it can be securely obtained. In said Formula (2), since n improves the liquid stability (uniformity, transparency) of what consists of mixing (Sa1) component and water, the number of 1-30 is preferable, and the number of 1-10 is more preferable. Do.

In addition, the compound represented by General formula (2) is not contained in surfactant defined above.

As a nonpolar organic solvent, For example, Chain hydrocarbons (aliphatic hydrocarbons), such as paraffins (dodecane, tetradecane, etc.), and olefins (dodecene, tetradecene, etc.); Alicyclic compounds, such as cycloalkane, etc. can be used.

It is preferable that the detergent composition for liquid crystal removal of this invention mixes (Sa1) component and water especially for the reason of the drainage load to an environment being reduced, and a non-hazardous thing can be easily made.

In this case, it is preferable that it is 10-95 mass%, as for the content rate of the water in the said detergent composition for liquid crystal removal, It is more preferable that it is 50-95 mass%, It is still more preferable that it is 80-95 mass%. When the content rate of water is 10 mass% or more, the drainage load to an environment can be reduced more, and the said liquid crystal removal detergent composition can be made non-hazardous. On the other hand, when it is 95 mass% or less, the compounding balance with (Sa1) component can be taken, and the washing | cleaning power with respect to liquid crystal contamination improves more.

The water is not particularly limited, and for example, distilled water, ion-exchanged water, or municipal water can be used.

Since the detergent composition for liquid crystal removal of this invention shows the uniform and transparent external appearance among the thing formed by mixing the above-mentioned (Sa1) component and water, since the solution excellent in liquid stability (uniformity, transparency) can be prepared, In addition to the said (Sa1) component and water, the compound represented by the said Formula (2), HLB is at least 1 sort (s) chosen from the group which consists of 11 or more nonionic surfactant and an aprotic polar organic solvent (Hereinafter, said one kind is "(S2 It is preferable that the composition is further mixed).

The detergent composition for liquid crystal removal, ie, a mixture of (Sa1) component, water and (S2) component may be referred to as "(Sa1) -water transparent solution" below.

 It is preferable that it is 5-70 mass%, and, as for the content rate of the (Sa1) component in "(Sa1) -water transparent solution", it is more preferable that it is 20-70 mass%. If the content rate of (Sa1) component is more than a lower limit, the washing | cleaning power with respect to liquid crystal contamination will improve more. If it is below an upper limit, the drainage load to an environment can be reduced more. Moreover, the liquid stability (uniformity, transparency) of the said transparent solution improves more.

(Sa1) A component may be used individually by 1 type and may use 2 or more types together.

It is preferable that it is 10 mass% or more, and, as for the content rate of water in "(Sa1) -transparent solution", it is more preferable that it is 10-50 mass%. If the content rate of water is more than a lower limit, the said transparent solution can be made non-dangerous.

It is preferable that it is 10-70 mass%, and, as for the content rate of (S2) component in "(Sa1) -water transparent solution", it is more preferable that it is 30-60 mass%. If the content rate of (S2) component is more than a lower limit, the liquid stability (uniformity, transparency) of the said transparent solution will improve more. If it is below an upper limit, the washing | cleaning power with respect to liquid crystal contamination will improve more.

(S2) A component may be used individually by 1 type and may use 2 or more types together.

By using the (S2) component, the compatibility between the (Sa1) component and water is increased.

In addition, when HLB uses 11 or more nonionic surfactants as a (S2) component, the cloud point of the said transparent solution becomes high, and the effect which prevents clouding under conditions of high temperature storage can be acquired.

In addition, when an aprotic polar organic solvent is used as the component (S2), the cleaning power against liquid crystal contamination is further improved.

The mixing ratio [(Sa1) / (S2)] of the (Sa1) component and the (S2) component is

When HLB uses 11 or more nonionic surfactant as (S2) component, it is preferable that it is (Sa1) / (HLB is 11 or more nonionic surfactant) = 0.1-10 by mass ratio, and it is more preferable that it is 0.1-6. desirable.

When using an aprotic polar organic solvent as (S2) component, it is preferable that it is (Sa1) / (aprotic polar organic solvent) = 0.1-10, and, as for mass ratio, it is more preferable that it is 0.1-9.

When using the compound represented by the said General formula (2) as a (S2) component, it is preferable that it is (Sa1) / (compound represented by Formula 2) = 0.5-10, and, as for mass ratio, it is more preferable that it is 1-6.

In any case, washability improves that it is more than the lower limit of (Sa1) / (S2). If it is below the upper limit of (Sa1) / (S2), the liquid stability (uniformity, transparency) of a detergent composition will improve.

PH of "(Sa1) -water transparent solution" is not specifically limited, It is preferable that it is the range of pH2-10 grade at 25 degreeC. When the pH of the transparent solution is in the range of about 2 to about 10, corrosion of the liquid crystal panel is less likely to occur.

In the present invention, the pH of the detergent composition for liquid crystal removal is controlled by heating the detergent composition at 25 ° C., using a glass electrode pH meter (product name: HM-30G, manufactured by Dong Aikeke Co., Ltd.). And a glass electrode are immersed directly in the said detergent composition, and the value of pH which shows after 1 minute passes is said.

The viscosity of "(Sa1) -water transparent solution" is not specifically limited, It is preferable that it is 15 mPa * s or less at 25 degreeC. If the viscosity of the said transparent solution is below an upper limit, the washing | cleaning power with respect to liquid crystal contamination will improve more. In addition, the drainage load to the environment can be further reduced.

In the present invention, the viscosity of the detergent composition for removing liquid crystal is measured at 60 rpm and 60 seconds in rotor No. 2 using DV-I + VISCOMETER (product name, manufactured by Brookfield), with the detergent composition heated at 25 ° C. It points out the value (mPa * s) measured by.

Moreover, it is also preferable that the detergent composition for liquid crystal removal of this invention consists of the organic solvent component containing (Sa1) component. In this case, it is preferable that the content rate of the (Sa1) component in the said organic solvent component is 20 mass% or more, It is more preferable that it is 50 mass% or more, It may be 100 mass%, It is especially preferable that it is 100 mass%. If the content rate of the said aromatic compound is more than a lower limit, the washing | cleaning power with respect to liquid crystal contamination will improve more.

As other components other than (Sa1) component which may be contained in the said organic solvent component, For example, chain hydrocarbons, such as paraffins (dodecane, tetradecane, etc.), olefins, etc. (dodecene, tetradecene, etc.) Aliphatic hydrocarbon); Alicyclic compounds such as cycloalkane; Flotonic polar organic solvents and aprotic polar organic solvents, such as the above-mentioned monohydric alcohol, monocarboxylic acid, or glycol ether; Aromatic compounds other than (Sa1) component, etc. are mentioned.

The detergent composition for liquid crystal removal of this invention puts (Sa1) component and arbitrary components, such as water, in the same container, for example, and then performs constant stirring, and (Sa1) component is disperse | distributed in arbitrary components, for example. It can be prepared as a dispersion liquid or an emulsion, or a solution of (Sa1) component and an arbitrary component (for example, said "(Sa1) -water transparent solution" etc.).

Moreover, you may mix and prepare the said organic solvent component containing (Sa1) component, and arbitrary components, such as water.

In addition, when using for the removal of liquid-crystal contamination, the detergent composition for liquid crystal removal of this invention can use the said detergent composition as a stock solution as it is, and can also mix and use with another component. As described later, the detergent composition may be diluted with water and used.

According to the detergent composition for liquid crystal removal of this invention demonstrated above, the effect that the cleaning power with respect to liquid crystal contamination is high can be acquired. Although the reason for this effect is not clear, it is guessed because the compatibility of the aromatic compound ((Sa1) component) represented by the said General formula (1) used for the detergent composition for liquid crystal removal of this invention, and liquid crystal contamination is high.

According to the studies of the present inventors, for example, liquid crystal contamination adhering to a gap (narrow portion) of a liquid crystal panel is rapidly dissolved in the (Sa1) component, and is used in a chain hydrocarbon (aliphatic hydrocarbon) or alicyclic compound that is conventionally used. In contrast, it was confirmed that compatibility with the (Sa1) component is high. It is considered that this is because the affinity between (Sa1) component and liquid crystal contamination increases because interaction of (pi) electrons acts between (Sa1) component and the aromatic compound contained in liquid crystal contamination.

In addition, it was confirmed that when the (Sa1) component was used, especially when mixed with water, the cleaning power against liquid crystal contamination was higher than when using aromatic compounds other than the (Sa1) component. This is considered to be due to the (Sa1) component having two specific substituents (R ¹ , R ² ) and showing some solubility in water.

In Table 1, the solubility (25 degreeC) in the water of the aromatic compound (organic solvent) used for the Example mentioned later is shown.

In Table 1, * 1 indicates the MSDS of the manufacturer, * 2 indicates the STN REGISTRY file (values obtained by using the exclusive software), and * 3 indicates the product evaluation base technology organization (nite). Homepage, * 4 shows that it is the solubility in water based on the solvent handbook (Godansha), respectively.

TABLE 1

In Table 1, the aromatic compounds (p-xylene glycol dimethyl ether, α-methoxy-p-xylene, 1,2-dimethoxybenzene, 1,4-dimethoxybenzene) according to the present invention are solubility in water. Is 0.16 to 0.32 g / 100g aqueous solution, and shows slight solubility in water.

In contrast, p-xylene and toluene show little solubility in water; Benzyl alcohol (contained in the aromatic monocyclic compound described in Patent Document 1) has a solubility in water of more than 1 g / 100 g aqueous solution, and high solubility in water as compared to the aromatic compound according to the present invention. According to the investigation by the present inventors, it was confirmed that when the aromatic compound whose solubility in water exceeds 1 g / 100g aqueous solution is used, it is difficult to obtain the effect of the improvement of the washing | cleaning power with respect to liquid-crystal contamination. This is considered to be because adsorption of the aromatic compound to liquid crystal contamination becomes weak. The anisole and the aromatic compound according to the present invention have the same degree of solubility in water, but the anisole has one substituent (-OCH ₃ ), which is different from the aromatic compound according to the present invention.

Moreover, according to the detergent composition for liquid crystal removal of this invention, the effect that the drainage load to an environment can be reduced can be acquired. The reason for this effect is obtained as follows.

In the detergent composition for liquid crystal removal of this invention, since the washing power with respect to liquid crystal contamination of (Sa1) component is high, the density | concentration of (Sa1) component can be made low. In addition, the (Sa1) component can be mixed with water and used, and does not correspond to any of the chemical substance discharge movement notification (PRTR) system, the Labor Safety Sanitation Act (the Presbyopia Act), the poison and the Poison Control Act (the poison law). will be. Therefore, it is thought that the detergent composition for liquid crystal removal of this invention has a low drainage load to an environment.

In addition, xylene and toluene correspond to all of PRTR, presbyopia, and toxicology, and anisole corresponds to presbyopia. Benzyl alcohol and phenyl glycolate ol (aromatic compound contained in the _{^{"R 12 O (AO) k R}} 13 " described in Patent Document 2), but which do not correspond to PRTR, presbyopia method, whichever of the dock geukbeop.

Moreover, according to the detergent composition of this invention, since it can use dilution with water at the time of washing | cleaning, even if the (Sa1) component in the stock solution of the said detergent composition is high concentration, at the time of washing | cleaning, it is diluted (Sa1) component. Since the concentration can be made low, the drainage load to the environment is reduced. In addition, since the washing liquid which has become low due to dilution can be subjected to a simple oil-water separation membrane treatment (for example, U-Tech FS type TH manufactured by Asahi Chemical Co., Ltd.) even at room temperature, the drainage load to the environment can be further reduced. . On the other hand, the stock solution of the detergent composition containing the (Sa1) component at a high concentration can be economically advantageous, such as reducing the transportation size and reducing the quantity of the container at the time of transportation.

In addition, in particular, according to the detergent composition formed by mixing the (Sa1) component, water, and the (S2) component, a stock solution having a uniform and transparent appearance and excellent in liquid stability (uniformity and transparency) can be prepared, Moreover, the liquid crystal removal detergent composition for which non-hazardous material was planned as a stock solution can be obtained. Moreover, the quantity of (Sa1) component mix | blended with the detergent composition itself can also be reduced, while the drainage load to an environment is reduced more, and the favorable washing | cleaning effect with respect to liquid crystal contamination is also acquired.

The detergent composition for liquid crystal removal of this invention is a detergent composition suitable for washing | cleaning of a liquid crystal panel.

The aromatic compound represented by the said Formula (1) used for this invention is industrially easy to obtain. Examples of the main use of the aromatic compound include organic synthetic raw materials such as intermediates of resins and intermediates of pharmaceuticals. The liquid crystals of the present invention are completely different from those of the conventional use and the use of liquid crystal removal of the present invention. The detergent composition for a thing provides a new use of the said aromatic compound.

≪Washing method of liquid crystal panel≫

The washing | cleaning method of the liquid crystal panel of this invention is a method of using the detergent composition for liquid crystal removal of the said this invention.

The washing | cleaning method of the liquid crystal panel of this invention is not specifically limited, For example, it can carry out as follows.

That is, the liquid crystal panel is immersed for a predetermined time while stirring the detergent composition for removing liquid crystal of the present invention (cleaning step). The detergent composition for liquid crystal removal may be used, for example, a mixture of an arbitrary component such as (Sa1) component and water in advance, or may be mixed at the time of washing using the (Sa1) component and the optional component individually. . In addition, you may use the organic solvent component containing (Sa1) component instead of the said (Sa1) component.

Especially, it is preferable to dilute and use the said detergent composition for liquid crystal removal with water, and it is more preferable to dilute and use it with 2-20 times of water. In this case, it is preferable to use said "(Sa1) -water transparent solution" as said detergent composition for liquid crystal removal.

As a method of the said dilution, it is preferable to use 2-20 times of water of the said liquid crystal removal detergent composition, and it is more preferable to use 2-15 times of water.

When the detergent composition for liquid crystal removal is diluted with 2 times or more water, the liquid crystal contamination adhered to the gap of the liquid crystal panel can be sufficiently removed, and the drainage load to the environment can be further reduced.

When the detergent composition for liquid crystal removal is diluted with 20 times or less water, liquid crystal contamination can be sufficiently removed with a low concentration of (Sa1) component.

Subsequently, the liquid crystal panel is taken out from the detergent composition and immersed in water (rinse step).

Thereafter, the liquid crystal panel is taken out in water and dried using a dryer or the like (drying step).

In addition, you may perform an ultrasonic treatment in a washing | cleaning process or a rinse process. When ultrasonication is performed, since the liquid crystal contamination adhered to the gap of a liquid crystal panel can be removed more favorably in a short time, it is preferable.

Moreover, the washing | cleaning method of the liquid crystal panel of this invention, besides the said washing | cleaning method, the method etc. which apply | coat and wipe | spray the liquid crystal removal detergent composition of this invention directly from a nozzle etc. are applied to the liquid crystal panel which is a to-be-cleaned object, etc. are mentioned.

According to the washing | cleaning method of the liquid crystal panel of this invention demonstrated above, liquid crystal contamination adhered to the gap of a liquid crystal panel can fully be removed, and the drainage load to an environment can be reduced.

EXAMPLE

Although an Example demonstrates this invention further in detail below, this invention is not limited to these Examples.

The organic solvent [acquisition destination] used in the present Example is as follows. Below, these structures are shown together.

p-xylene glycol dimethyl ether [manufactured by Iharanikei Chemical Industry].

α-methoxy-p-xylene [manufactured by Iharanikei Chemical Industry].

1,2-dimethoxybenzene [Tokyo Chemical Industry].

1,4-dimethoxybenzene [Tokyo Chemical Industry Products].

p-xylene [pure chemicals].

Toluene [Kanto Chemical].

Anisole [Kanto Chemical].

Benzyl alcohol [Kanto Chemical].

Phenylglycool [Japanese emulsifier product].

Cyclohexane [pure chemicals].

1-dodecene [Idemitsu Heungsan Products].

Normaldodecan [Japan Energy Products].

<Evaluation of cleaning power for liquid crystal contamination (1)>

In accordance with the procedure 1) to 6) shown below, the cleaning power against liquid crystal contamination was evaluated.

1) The liquid crystal panel was produced and the liquid crystal material for TFT liquid crystal panels was injected into the gap of the said liquid crystal panel using the syringe.

The empty liquid crystal panel before inject | pouring a liquid crystal material used by the present Example is shown in FIG.

1: A is a schematic perspective view which shows a liquid crystal panel, and B of FIG. 1 is a partial side view of the liquid crystal panel in the edge part 1b1 side of the glass substrate 1b in A of FIG.

In the liquid crystal panel 10 shown in FIG. 1A, a pair of glass substrates 1a and 1b are bonded together through an adhesive part 2, leaving an opening (not shown) with an adhesive, and then the liquid crystal chamber 3. (Display part) was made, and the said opening part was sealed and manufactured with the sealing agent. The electrode 6 is formed in the liquid crystal panel 10.

As shown in B of FIG. 1, the produced liquid crystal panel 10 has a distance from the edge part 1a1 of the glass substrate 1a to the adhesion part 2 (the length of the space | gap part 4) The distance between 300 micrometers and glass substrates 1a and 1b was 3 micrometers.

And it is formed by the opposing glass substrates 1a and 1b and the adhesion part 2 of the outer side (opposite side to the liquid crystal chamber 3 side) of the adhesion part 2 of a pair of glass substrate 1a, 1b. The operation after 2) was performed using the liquid crystal panel 10 (2 inch size) which injected the liquid crystal material (not shown) in the narrow gap which becomes.

In addition, the range enclosed by X in FIG. 1 shows the area | region which evaluated the liquid crystal material remainder state in operation of following 6).

2) 20 g of each detergent composition obtained by mixing 2 g of each of the above organic solvents and 18 g of ion-exchanged water, respectively, was placed in a 100 ml beaker, followed by stirring (600 rpm) using a stirrer of 2 cm in length, followed by a gap ( The liquid crystal panel in which the liquid crystal material was inject | poured into the back part was immersed in the stock solution of a detergent composition for 5 minutes at 60 degreeC.

3) The liquid crystal panel was taken out, and each surface was washed with ion exchanged water for 5 seconds on one side.

4) 50 g of ion-exchanged water was put into a 100 ml beaker, and the liquid crystal panel was immersed at 60 degreeC for 10 minutes (rinse process).

5) The liquid crystal panel was taken out and dried in a dryer at 100 ° C for 10 minutes.

6) The polarization microscope WHEREIN: The remaining state of the liquid crystal material in the gap in the predetermined | prescribed area | region (X in FIG. 1) of a liquid crystal panel was observed visually, and based on the following evaluation criteria (pass: 4 or more points). The cleaning power against liquid crystal contamination was evaluated. The results are shown in Table 2.

(Evaluation standard)

5 points | pieces: A liquid crystal material is wash | cleaned and removed completely.

4 points | pieces: Very little liquid crystal material remains.

3 points | pieces: A liquid crystal material remains here and there.

2 points | pieces: A liquid crystal material remains in a lump form.

1 point | piece: More than half of liquid crystal material remains.

The remaining state of the liquid crystal material in the gap in the predetermined region (X in FIG. 1) of the liquid crystal panel corresponding to the evaluation criteria is shown in FIG. 2. In FIG. 2, 5 is a liquid crystal material, 1a and 1b are glass substrates, and 2 is an adhesion part, respectively.

TABLE 2

As apparent from the results of Table 2, it was confirmed that the detergent compositions of Examples 1 to 4 using the aromatic compounds according to the present invention had a higher cleaning power against liquid crystal contamination than the detergent compositions of Comparative Examples 1 to 8.

In addition, the aromatic compound (organic solvent) concentration of the detergent compositions of Examples 1 to 4 was as low as 10% by mass, and all of the aromatic compounds (organic solvents) do not correspond to any of the PRTR, presbyopia method, and toxic method. Since the detergent compositions of Examples 1 to 4 are low in drainage load to the environment.

<Preparation of detergent composition>

(Examples 5 to 19, Comparative Example 9)

According to the composition shown to Tables 3-4, the detergent composition of each case was prepared by mixing each component according to a daily method.

The unit of the compounding quantity in a table | surface is the mass% based on the total mass of a detergent composition, and shows the pure part conversion amount of each component.

Below, the component shown in the table is demonstrated.

[Description of ingredients shown in table].

Aromatic compound represented by the formula (1) (Sa1)

PXDM: p-xylene glycol dimethyl ether [Iharanikei Chemical Co., Ltd. product].

Comparative component of (Sa1) component [Hereinafter, it is represented by "(Sa1 ') component.]

Dodecane: Normal Dodecane [Japan Energy Products].

Water: Ion Exchange Water

At least one compound (S2) selected from the group consisting of a compound represented by the formula (2), wherein the HLB comprises 11 or more nonionic surfactants and an aprotic polar organic solvent;

‥ (Compound represented by Formula 2)

C4E3: Triethylene glycol monobutyl ether, wherein R ³ in formula (2) is a butyl group, n is 3. Product Name: Butycerol 30, Kyowa Fermentation Chemicals.

C6E8: the R ³ in the general formula 2-hexyl group, n is eight, octa ethylene glycolate come monohexyl ether.

Ph-G EO3 mol: Triethylene glycol monophenyl ether in which R <^3> in General formula (2) is a phenyl group and n is 3. Product name: Phenylglycool-30 (PhG-30), a Japanese emulsifier.

Ethanol: A monohydric alcohol wherein R ³ in the formula (2) is an ethyl group and n is 0. Kanto Chemical; Flotonic polar organic solvent.

‥ (nonionic surfactant with 11 or more HLB)

C10E14 (HLB = 15.9): Polyoxyethylene alkyl (branched decyl) ether whose carbon number of an alkyl group is 10 and the repeating number (average addition mole number of ethylene oxide) of an oxyethylene group is 14. Product name: Neugen XL-140, Daiichi Kogyo Pharmaceuticals.

C8E20 (HLB = 17.4): Polyoxyethylene alkyl (2-ethylhexyl) ether whose carbon number of an alkyl group is 8 and the repeating number (average addition mole number of ethylene oxide) of an oxyethylene group is 20. New Call 1020, a Japanese emulsifier.

C10E5 (HLB = 11.6): Polyoxyethylene alkyl (branched decyl) ether having 10 carbon atoms in the alkyl group and 5 repeating numbers (average added mole number of ethylene oxide) of the oxyethylene group. Trade name: Neugen XL-50, Daiichi Kogyo Pharmaceuticals.

‥ (Aprotic Polar Organic Solvent)

DMSO: Dimethyl sulfoxide, a Toray Fine Chemicals.

DMF: N, N-dimethylformamide, Kanto Chemical.

Acetone: Kanto Chemical.

Comparative component of (S2) component [Hereinafter, represented by "(S2 ') component"

C10E4 (HLB = 10.5): Polyoxyethylene alkyl (branched decyl) ether whose carbon number of an alkyl group is 10 and the repeating number (average addition mole number of ethylene oxide) of an oxyethylene group is four. Product name: Neugen XL-40, Daiichi Kogyo Pharmaceuticals.

<Evaluation of liquid stability>

[Evaluation of appearance]

10 g of the detergent composition immediately after preparation according to the composition shown to Tables 3-4 were put into 10 ml of wheat-tight bottles, respectively, and the external appearance after standing still at room temperature (20 degreeC) for 1 day was observed visually.

When the external appearance was uniformly transparent, (circle) and the state of the cloudiness-2 layer separation, it was set as x. The results are shown in Tables 3 and 4.

"White turbidity" as used here shows that it has been suspended over the whole aqueous solution. "Separation of two layers" shows separation into an oil layer and a water layer.

[Measurement of cloud point]

About the detergent composition of each case, after mix | blending a detergent composition at 15-25 degreeC, and preparing a uniform and transparent solution, 20 g of the said solution was accommodated in a 30 ml glass test tube and immersed in a water bath, and the temperature of a water bath was 1 The temperature (° C.) of the solution at the time when the solution started to become cloudy and white was raised to C / min, was measured by reading a scale of a standard thermometer. The results are shown in Tables 3 and 4.

<Evaluation of cleaning power for liquid crystal contamination (2)>

In accordance with the procedures 1) to 7) shown below, the cleaning power against liquid crystal contamination was evaluated.

1) In the same manner as in the evaluation (1), a liquid crystal panel shown in FIG. 1 was produced, and a liquid crystal material for a TFT liquid crystal panel was injected into a gap of the liquid crystal panel using a syringe.

2) 20 g of the detergent compositions in each case were placed in a 100 ml beaker, and the detergent composition was diluted with 80 g of ion-exchanged water (four times as much water as the detergent composition) to prepare 100 g of a 20 mass% aqueous solution.

And the external appearance of the 20 mass% aqueous solution after 10 seconds passed after stopping agitation was visually observed. The results are shown in Tables 3 and 4.

In the table, "cloudy" indicates that the solution is suspended over the entire aqueous solution. "Separation of two layers" means separating into an oil layer and an aqueous layer.

3) A liquid crystal panel in which 20 g of 20% by mass aqueous solution of each case was put in a 100 ml beaker, respectively, and stirring (600 rpm) was continued using a 2 cm length stirrer, It was immersed in the said 20 mass% aqueous solution at 45 degreeC for 15 minutes.

4) The liquid crystal panel was taken out, and each side was washed with ion-exchange water for 5 seconds on each side.

5) 50 g of ion-exchanged water was put in a 100 ml beaker, and the liquid crystal panel was immersed at 45 degreeC for 10 minutes (rinse process).

6) The liquid crystal panel was taken out and dried in a dryer at 100 ° C for 10 minutes.

7) A polarization microscope was used to visually observe the remaining state of the liquid crystal material in the gap in the predetermined region (X in FIG. 1) of the liquid crystal panel, and to evaluate the evaluation criteria (passed: 4). On the basis of the above-mentioned point), the cleaning power against the liquid crystal contamination was evaluated. The results are shown in Tables 3 and 4.

TABLE 3

TABLE 4

From the results of Tables 3 to 4, it was confirmed that the detergent compositions of Examples 5 to 18 were all uniform and transparent in appearance, and also had high cleaning power against liquid crystal contamination. Moreover, as for the detergent composition of Examples 5-18, it was also able to confirm that a cloud point is 30 degreeC or more in all.

In the detergent composition of Example 19 using the (S2) component and the other (S2 ') component, it was confirmed that the cleaning power with respect to liquid crystal contamination was high and that a uniform and transparent appearance was not obtained.

On the other hand, in the detergent composition of Comparative Example 9 using the (Sa1) component and other dodecane, it was also confirmed that the cleaning power against liquid crystal contamination was low and a uniform and transparent appearance was not obtained.

Therefore, the detergent composition formed by mixing the (Sa1) component, water, and the (S2) component showed a uniform and transparent appearance and was confirmed to be excellent in liquid stability (uniformity, transparency). In addition, since it was possible to dilute with water and use the (Sa1) component at a low concentration, it was confirmed that the drainage load to the environment could be reduced and the cleaning power against liquid crystal contamination was high.

In addition, in this evaluation (2), when wash | cleaning a liquid crystal panel, the 20 mass% aqueous solution of the detergent composition of Examples 5-19 is cloudy. Thus, it was also confirmed that favorable cleaning effect with respect to liquid-crystal contamination was obtained in the detergent composition and washing | cleaning method of this invention by carrying out washing | cleaning by making the cloudy aqueous solution contact a liquid crystal panel.

In addition, it was also confirmed that a cloudy 20 mass% aqueous solution can be easily removed from the liquid crystal panel in the rinse step.

The present invention can sufficiently remove the liquid crystal contamination attached to the gap of the liquid crystal panel and the detergent composition for removing the liquid crystal, which has high cleaning power against liquid crystal contamination and can reduce the drainage load to the environment. Moreover, it is possible to provide the cleaning method of the liquid crystal panel which can reduce the drainage load to an environment.

(Explanation of symbols for the main parts of the drawing)

1a: glass substrate 1b: glass substrate

2: bonding portion 3: liquid crystal chamber

4: space | gap part 5: liquid crystal material

10 liquid crystal panel

FIG. 1 shows an empty liquid crystal panel used before the liquid crystal material is injected in this embodiment, A in FIG. 1 is a schematic perspective view showing a liquid crystal panel, and B in FIG. 1 is a glass substrate (A) in FIG. Partial side view of the liquid crystal panel at the end 1b1 side of 1b).

FIG. 2 is a photograph showing a state of the rest of the liquid crystal material in a gap in a predetermined region (X in FIG. 1) of the liquid crystal panel corresponding to the evaluation criteria of the present embodiment. FIG.

Claims (4)

A detergent composition for removing liquid crystals, comprising an aromatic compound represented by the following formula (1). [Formula 1]

[Wherein, R ¹ represents OCH ₃ or CH ₂ OCH ₃ and R ² represents CH ₃ , OCH ₃ or CH ₂ OCH ₃ ] The method of claim 1, Detergent composition for liquid crystal removal, characterized in that the mixture of the aromatic compound represented by the formula (1) and water. The method of claim 2, The compound represented by the following formula (2), HLB is a detergent composition for removing liquid crystals, characterized in that at least one selected from the group consisting of 11 or more nonionic surfactants and aprotic polar organic solvents are further mixed. [Formula 2]

[Wherein R ³ is an alkyl group having 1 to 6 carbon atoms, a phenyl group or a benzyl group, and n is a number of 0 to 50] The cleaning method of a liquid crystal panel using the detergent composition for liquid crystal removal of any one of Claims 1-3.

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