JP2008075090A - Aqueous liquid cleaner composition for liquid crystal panel - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide aqueous liquid cleaner compositions for liquid crystal panels which are capable of effectively removing large variety of liquid crystal materials having different physical properties due to the differences of their chemical structures. <P>SOLUTION: The aqueous liquid cleaner compositions for the liquid crystal panels comprise components (D), (E), (F) and (G), and a specific amount of water. The component (D) is 8-20C hydrocarbon compound having 5-50 mass%, the component (E) is an anionic surface-active agent having 1-20 mass%, the component (F) is a compound illustrated in general formula (4): R<SP>4</SP>O(BO)<SB>o</SB>R<SP>5</SP>, wherein R<SP>4</SP>represents an alkyl group having 4-11C, an alkenyl group, a phenyl group or a benzyl group, R<SP>5</SP>represents a hydrogen atom or an alkyl group having 1-4C, BO represents an oxyalkylene having 2-3C, o represents an integer of 1 to 6, having 1-40 mass%, and the component (G) is dimethyl sulfoxide having 1-20 mass%. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to an aqueous liquid cleaning composition for liquid crystal panels.

  Liquid crystal panels have the advantage of low power consumption, and as a result of technological improvements such as higher contrast in recent years, a variety of image displays are possible. Small panels such as computer terminal displays, TV displays, mobile phones, etc. It is used in a wide range of fields, and its uses are expanding.

In this liquid crystal panel, the periphery of two glass substrates that are opposed to and held at a predetermined distance of 10 μm or less is bonded with an adhesive so that a hollow portion is formed inside, and then the liquid crystal is placed in the hollow portion. Is manufactured.
In this case, characters and image display electrodes made of a transparent conductive film are provided in the two glass substrates, and characters and images are displayed by applying a control electrical signal to these electrodes. It has a configuration.

In recent years, liquid crystal panels have been rapidly colorized to support various display applications such as personal computers, mobile phones, and PDAs. With this, in addition to the conventional liquid crystal materials for STN for passive panels, active panels Liquid crystal materials for TFTs have been developed.
The liquid crystal material for STN uses an aromatic compound having a substituent typified by a cyano group, and the liquid crystal material for TFT uses an aromatic compound having a substituent typified by a fluorine group. Yes.

As described above, since the liquid crystal material for STN and the liquid crystal material for TFT have different chemical structures and physical properties, it is necessary to use different types of cleaning agents for cleaning them.
That is, the liquid crystal material for STN can be efficiently removed by a hydrocarbon-based solvent or a detergent composition known from a mixed composition of a hydrocarbon-based solvent and glycol ether (Patent Document 1: Japanese Patent Laid-Open No. 10-25495). However, since it is not suitable for the removal of the liquid crystal material for TFT, a cleaning agent different from the cleaning agent used for the liquid crystal material for STN is required to remove this.

  At the present time when improvement in productivity of liquid crystal panels is demanded, a multi-type cleaning composition applicable to various liquid crystal materials having different chemical structures and physical properties has been demanded. However, until now, no cleaning composition has been known that can efficiently clean and remove a plurality of types of liquid crystal materials, has excellent cleaning ability, has low environmental impact and toxicity, and has low flammability.

Japanese Patent Laid-Open No. 10-25495

  The present invention has been made in view of such circumstances, and provides an aqueous liquid detergent composition for a liquid crystal panel capable of efficiently removing many types of liquid crystal materials having different physical properties due to different chemical structures. With the goal.

  As a result of intensive studies to achieve the above object, the present inventors have found that a cleaning composition containing a hydrocarbon, a specific glycol ether, an anionic surfactant and dimethyl sulfoxide is used for STN and TFT. The present invention has been completed by finding that these can be efficiently removed regardless of the difference in the physical properties of the liquid crystal material.

That is, the present invention
1. An aqueous liquid cleaning composition for a liquid crystal panel comprising the following components (D), (E), (F), (G) and a predetermined amount of water.
(D) C8-20 hydrocarbon compound; 5-50 mass%
(E) Anionic surfactant; 1 to 20% by mass
(F) Compound represented by the following general formula (4): 1 to 40% by mass
R ⁴ O (BO) _o R ⁵ (4)
(In the formula, R ⁴ represents an alkyl or alkenyl group having 4 to 11 carbon atoms, or a phenyl group or benzyl group, R ⁵ represents a hydrogen atom or an alkyl group having 1 to 4 carbon atoms, and BO represents 2 to 3 carbon atoms. (O represents a number of 1 to 6.)
(G) Dimethyl sulfoxide; 1 to 20% by mass
I will provide a.

  ADVANTAGE OF THE INVENTION According to this invention, the aqueous liquid cleaning composition for liquid crystal panels which exhibits favorable detergency with respect to various liquid crystal materials from which physical properties differ, such as liquid crystal materials for STN and TFT, can be provided. In addition, since this detergent composition has low environmental impact and toxicity, is low in flammability, and does not use an alcohol ethylene oxide adduct having 12 to 15 carbon atoms, the PRTR method (Chemical Substance Management Promotion Method) There is no need to submit a notification as defined in).

Hereinafter, the present invention will be described in more detail.
As described above, the aqueous liquid detergent composition for a liquid crystal panel of the present invention contains 5 to 50% by mass of component (D), 1 to 20% by mass of component (E), and component (F) in the composition. 1 to 40% by mass, 1 to 20% by mass of (G) component dimethyl sulfoxide, and a predetermined amount of water.

Here, if the blending amount of the component (D) is less than 5% by mass, there is a high possibility that the detergency of a relatively high-polarity liquid crystal material such as a liquid crystal material for STN will decrease. There is a high possibility that the detergency of a relatively low-polarity liquid crystal material such as a material is lowered and the rinsing property is remarkably lowered. The blending amount of the component (D) is more preferably 10 to 40% by mass. When the blending amount of the component (E) is less than 1% by mass, there is a high possibility that the rinsing property is lowered, and when it exceeds 20% by mass, the liquid stability is likely to be lowered. The blending amount of the component (E) is more preferably 5 to 20% by mass. When the blending amount of the component (F) is less than 1% by mass, the liquid stability and the rinsing property are likely to be lowered, and when it exceeds 40% by mass, the cloud point is likely to be lowered. The blending amount of the component (F) is more preferably 10 to 35% by mass. When the blending amount of the component (G) is less than 1% by mass, there is a high possibility that the detergency of a relatively low-polarity liquid crystal material such as a liquid crystal material for TFT will be reduced. There is a high possibility of decline.
The blending amount of water is not particularly limited, but it is desirable to blend at least 10% by mass or more with respect to the composition to reduce the flammability of the composition.
In this cleaning composition, in order to further enhance the cleaning properties of a relatively polar liquid crystal material such as STN liquid crystal material, the blending amount of component (D) is the amount of component (G) (dimethyl sulfoxide). It is preferable to make it more than a compounding quantity.

  The component (D) is a hydrocarbon compound having 8 to 20 carbon atoms, preferably 10 to 14 carbon atoms, preferably a paraffin or olefinic hydrocarbon compound. For example, n-octane, n-decane, n- Dodecane, n-tetradecane, n-hexadecane, n-octadecane, isooctane, isododecane, isooctadecane, unsaturated compounds corresponding to these, and the like can be used.

  Examples of the anionic surfactant of the component (E) include an α-olefin sulfonate having an average carbon number of 10 to 20, a sulfosuccinic acid type anionic surfactant, an alkyl sulfate having an average carbon number of 10 to 20, and an average carbon. Alkyl (or alkenyl) ether sulfate having a linear or branched alkyl or alkenyl group of several tens to twenty and an average of 0.5 to 8 moles of ethylene oxide, saturated or having an average carbon number of 5 to 22 Examples include unsaturated fatty acid salts.

  Among these anionic surfactants, sulfosuccinic acid type anionic surfactants are preferably used because they contribute to the improvement of penetrating power and are excellent in the performance of raising the cloud point of the composition. be able to. The sulfosuccinic acid type anionic surfactant is not particularly limited, but is a sulfosuccinic acid dialkyl (or alkenyl) ester type surfactant represented by the following general formula (5), the following general formula (6) It is possible to use at least one anionic surfactant selected from the group consisting of a sulfosuccinamide / ester mixed surfactant represented by formula (1) and a sulfosuccinic acid monoamide type surfactant represented by the following general formula (7): preferable.

〔式中、Ｒ⁶〜Ｒ¹⁰は、互いに同一または異種の炭素数３〜２２のアルキル基もしくはアルケニル基を示し、Ｍはアルカリ金属イオン、アルカリ土類金属イオンまたはアンモニウムイオンを示す。〕

[Wherein, R ^{6 to} R ¹⁰ represent the same or different alkyl group or alkenyl group having 3 to 22 carbon atoms, and M represents an alkali metal ion, an alkaline earth metal ion, or an ammonium ion. ]

In the above formulas (5) to (7), the alkyl group or alkenyl group having 3 to 22 carbon atoms is not particularly limited, and examples thereof include isobutyl, pentyl, hexyl, octyl, 2-ethylhexyl, dodecyl, hexadecyl and the like. Among these, octyl and 2-ethylhexyl which are excellent in liquid stability and the like are preferable. In particular, in consideration of enhancing the penetrating power, a sulfosuccinic acid type dialkyl ester salt in which R ⁶ and R ⁷ of the compound represented by the formula (5) are respectively isobutyl, pentyl, hexyl, octyl and 2-ethylhexyl is used. It is preferable. In addition, there is no restriction | limiting in particular in an alkali metal ion and an alkaline-earth metal ion, The quaternary ammonium ion of various amines can be used as an ammonium ion.

  The component (F) includes a short-chain alkyl (alkenyl) or a medium-chain alkyl (alkenyl) -monohydric alcohol alkylene oxide adduct, a phenol alkylene oxide adduct, and a benzyl alcohol alkylene oxide represented by the following formula (4): It is an adduct.

R ⁴ O (BO) _o R ⁵ (4)
(In the formula, R ⁴ represents an alkyl or alkenyl group having 4 to 11 carbon atoms, or a phenyl group or benzyl group, R ⁵ represents a hydrogen atom or an alkyl group having 1 to 4 carbon atoms, and BO represents 2 to 3 carbon atoms. (O represents a number of 1 to 6.)

  In the formula (4), examples of the alkyl group having 4 to 11 carbon atoms include n-butyl, isobutyl, tertiary butyl, pentyl, hexyl, octyl, nonyl, decyl, undecyl, 2-methyldecyl and the like. Among these, those having 4 to 8 carbon atoms are preferably used. Examples of the alkenyl group having 4 to 11 carbon atoms include butenyl, hexenyl, octenyl, decenyl, and the like. Among these, those having 4 to 8 carbon atoms are preferably used. Examples of the alkyl group having 1 to 4 carbon atoms include methyl, ethyl, propyl, n-butyl, isobutyl, and tertiary butyl.

The BO is an oxyalkylene having 2 to 3 carbon atoms, and oxyethylene and oxypropylene can be used alone or in combination, but it is preferable to use oxyethylene alone or a mixture of oxyethylene and oxypropylene. .
In this case, the added mole number o of oxyalkylene is a number of 1 to 6, preferably 1 to 4. If the number of added moles is less than 2, the liquid stability may become unstable. On the other hand, if it exceeds 6, the cleaning ability may be deteriorated.

  Suitable examples of the component (F) include diethylene glycol monobutyl ether, diethylene glycol dibutyl ether, diethylene glycol monohexyl ether, diethylene glycol mono 2-ethylhexyl ether, tetraethylene glycol mono 2-ethylhexyl ether, phenoxyethanol, diethylene glycol monobenzyl ether, and the like. Can be mentioned.

The method for producing the aqueous liquid cleaning composition for liquid crystal panels of the present invention described above is not particularly limited, and may be prepared by blending each component according to a conventional method. In this case, the blending order of each component may be arbitrary, but after thoroughly mixing components other than water, it is preferable to prepare a uniform liquid composition while adding water little by little.
In addition, when using the aqueous liquid cleaning composition for liquid crystal panels of the present invention, it can be used as a composition stock solution or further diluted with water to be used as an aqueous solution, but it exhibits sufficient detergency. Therefore, it is preferable to use the detergent composition stock solution.
When cleaning the liquid crystal panel with the aqueous liquid cleaning composition for liquid crystal panel of the present invention, after filling the liquid crystal panel with liquid crystal, the liquid crystal panel is charged into the cleaning composition of the present invention, and immersed and ultrasonically cleaned. And so on.

In addition to the above essential components, the aqueous liquid cleaning composition for liquid crystal panels of the present invention includes, as other optional components, amphoteric surfactants, cleaning builders, hydrotropes, etc. 30% by mass can be added to increase the cloud point, improve the cleaning power and the liquid stability, and the like. Furthermore, you may mix | blend 0.1-5 mass% with antirust agents, such as a benzotriazole and t-butyl benzoate, with respect to a composition.
In order to improve the liquid stability and the detergency, an alkylene oxide adduct of a linear alcohol having 11 or less carbon atoms that does not touch the regulations of the PRTR method (Chemical Substance Management Promotion Act) may be used in combination.

As described above, the aqueous liquid cleaning composition for a liquid crystal panel of the present invention contains the components (D), (E), (F) and (G) described above. In addition to exhibiting good detergency for various liquid crystal materials having different physical properties such as liquid crystal materials for use, the composition has low flammability and excellent stability over time of the composition.
Furthermore, in this invention, since the C12-C15 alcohol ethylene oxide adduct is not used, there is little environmental impact and there is also no need for the notification prescribed | regulated by PRTR method (Chemical substance management promotion method).

  EXAMPLES Hereinafter, although an Example and a comparative example are given and this invention is demonstrated more concretely, this invention is not limited to the following Example.

[Examples 1 to 6]
The components shown in Table 1 below were mixed to prepare an aqueous liquid cleaning composition for liquid crystal panels. In this case, after mixing components other than water sufficiently, water was added little by little to obtain a uniform liquid composition.

[Comparative Examples 1-3]
The components shown in Table 2 below were mixed to prepare an aqueous liquid cleaning composition for liquid crystal panels. In this case, after mixing components other than water sufficiently, water was added little by little to obtain a uniform liquid composition.

  For each liquid crystal panel aqueous liquid detergent composition obtained in Examples 1 to 6 and Comparative Examples 1 to 3, a typical STN and TFT model liquid crystal panel was used to evaluate cleaning power and rinsing performance. The liquid stability was evaluated. The results are shown in Table 3. Each item was measured and evaluated by the following method.

[1] Detergency evaluation A liquid crystal panel for STN or a liquid crystal material for TFT was applied to a gap portion of a liquid crystal panel having a gap of 5 μm cut to an appropriate size, and stabilized at 80 ° C. for 8 hours. To do. This sample to be cleaned was prepared by using ultrasonic cleaners (50 kHz, 200 W, SC-20 type, manufactured by Sun Electronics Co., Ltd.) with the stock solution of each cleaning composition prepared in Examples 1-6 and Comparative Examples 1-3. ) Was used for ultrasonic cleaning at 50 ° C. for 3 minutes. Next, the panel to be cleaned was taken out and subjected to ultrasonic rinsing under the same conditions in ion exchange water at 50 ° C. for 1 minute, and then dried for 60 minutes in a constant temperature dryer at 105 ° C. After the drying, the voids were observed using a polarizing microscope (BX-60, Olympus Kogyo Co., Ltd.), and the residual liquid crystal material was evaluated according to the following evaluation criteria.
Detergency evaluation (residual liquid crystal material)
◎: Completely cleaned ○: Almost cleaned △: Slightly cleaned ×: Not cleaned at all

[2] Rinsability evaluation Using a liquid crystal panel similar to that used in [1], thoroughly clean the voids by thoroughly washing in ethanol. The liquid crystal panel is immersed in each of the cleaning composition prepared in Examples 1 to 6 and Comparative Examples 1 to 3, and the voids are filled with the cleaning agent by ultrasonic irradiation. The panel filled with the cleaning solution is simply immersed in ion exchange water at 50 ° C. for 3 minutes, gently lifted and dried at 105 ° C. for 60 minutes. After completion of drying, the cleaning agent residual property of the voids is evaluated according to the following evaluation points using a polarizing microscope (BX-60, manufactured by Olympus Corporation).
◎: Rinsed completely and no cleaning agent remained. ○: Almost rinsed and almost no cleaning agent remained. △: Slightly rinsed and some cleaning agent remained. X: Cleaning agent was not rinsed at all. A large amount remained

[3] Liquid stability The cloud point of each detergent composition stock solution prepared in Examples 1 to 6 and Comparative Examples 1 to 3 was measured, and the uniform retention of the liquid in the high temperature region was evaluated according to the following evaluation.
◎: 50 ° C or higher ○: 40 ° C or higher and lower than 50 ° C △: 30 ° C or higher and lower than 40 ° C ×: Less than 30 ° C or cloudiness / separation

  As shown in Table 3, each liquid crystal panel aqueous liquid cleaning composition obtained in Examples 1 to 6 is superior to Comparative Examples 1 to 3 in terms of cleaning properties of both STN and TFT liquid crystal materials. It can be seen that it is excellent in rinsing properties and liquid stability.

Claims (1)

An aqueous liquid cleaning composition for a liquid crystal panel comprising the following components (D), (E), (F), (G) and a predetermined amount of water.
(D) C8-20 hydrocarbon compound; 5-50 mass%
(E) Anionic surfactant; 1 to 20% by mass
(F) Compound represented by the following general formula (4): 1 to 40% by mass
R ⁴ O (BO) _o R ⁵ (4)
(In the formula, R ⁴ represents an alkyl or alkenyl group having 4 to 11 carbon atoms, or a phenyl group or benzyl group, R ⁵ represents a hydrogen atom or an alkyl group having 1 to 4 carbon atoms, and BO represents 2 to 3 carbon atoms. (O represents a number of 1 to 6.)
(G) Dimethyl sulfoxide; 1 to 20% by mass