JPH0468096A - Detergent composition - Google Patents

Abstract

PURPOSE:To provide a detergent composition which does not raise environmental pollution and is improved in the removal of stains from liquid crystals, etc., and also in rinsing property and stability by mixing a specific hydrocarbon and a surfactant. CONSTITUTION:The title composition comprises 50wt.% or more of one or more 8 - 20 C hydrocarbons with a viscosity (20 deg.C) of 0.5 - 10cp selected from alkylbenzenes, olefins (polymer) and compounds having a cyclohexane ring (e.g. ethylbenzene), 0.01 - 50wt.% nonionic surfactant with an HLB of 4 - 15 (e.g. polyoxyalkylene alkyl ether) and, if necessary, alcohols, esters, antioxidants, corrosion inhibitors, etc.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention can be used in the manufacture of liquid crystal display devices, etc., and has excellent dirt removal properties and rinsing properties from liquid crystals, and is safe and free from environmental pollution such as fluorocarbons. The present invention relates to a cleaning composition free of.

[Prior Art and Problems to be Solved by the Invention] Liquid crystal display devices generally use a liquid crystal cell in which liquid crystal is filled between two substrates with electrodes provided on opposing surfaces. If liquid crystal adheres to the outside of a single substrate, not only will it not be possible to obtain a clear display screen, but it may also have an adverse effect on other electronic components, so it must be removed.

Conventionally, Freon 113 or 11.1 was used to remove attached liquid crystal.
-) Lichloroethane, etc. have been used, but these have environmental problems such as destruction of the ozone layer in the upper atmosphere, and toxicity problems.
Its use is becoming restricted.

On the other hand, cleaning with sugars or alcohols does not have these problems, but does not have sufficient ability to remove liquid crystal stains.

Therefore, there has been a desire for a cleaning composition that does not pollute the environment, has low toxicity, and has excellent stain removal properties.

[Means to solve the problem]

In view of these circumstances, the present inventors conducted extensive research and found that if a specific amount of a specific hydrocarbon and a surfactant are blended,
There are no environmental pollution or toxicity issues, and it has excellent dirt removal properties.
Furthermore, it was discovered that a cleaning composition with good rinsing properties could be obtained, and the present invention was completed.

That is, in the present invention, the carbon number is 8 to 20, and the temperature is 20°C.
The present invention provides a cleaning composition containing 50% by weight or more of a hydrocarbon having a viscosity of 0.5 to 10 cp and 0.01 to 50% by weight of a surfactant.

The hydrocarbon used in the present invention has 8 to 20 carbon atoms,
And the viscosity at 20°C is 0.5 to 10 cp. If the number of carbon atoms in the hydrocarbon is less than 8 or the viscosity is less than 0.5 cp, the hydrocarbon is highly flammable and safety during cleaning becomes a problem. On the other hand, if the carbon number exceeds 20 or the viscosity exceeds 1Ocp, cleaning of narrow gaps will not be sufficient, which is not preferable. Particularly preferred viscosity range is 0.5 to 5
It is cp.

Among the above hydrocarbons, alkylbenzenes, olefins,
Olefin polymers and compounds having a cyclohexene ring are particularly preferred because they have excellent detergency. Specific examples include alkylbenzenes such as xylene, ethylbenzene, diisopropylbenzene, cumene,
Examples include various straight alkylbenzenes or branched alkylbenzenes such as p-cymene, and olefins include octene, decene, dodecene, tetradecene, hexadecene,
eicosene, tetrapropylene, tetraisobutylene,
Examples include straight or branched chains such as hexapropylene. It is particularly preferable that the olefin has 12 to 18 carbon atoms. Examples of the olefin polymer include a 1-hexene trimer, a 1-octene dimer, and a 1-decene dimer. Examples of the compound having a cyclohexene ring include α-pinene, δ-pinene, limonene, β-terpinene, and terpinolene.

These hydrocarbons are contained in the composition of the present invention in an amount of 50% by weight or more,
Preferably, it is blended in an amount of 60 to 98% by weight. If it is less than 50 weight, it is not preferable because the cleaning performance is poor.

As the surfactant used in the present invention, any of anionic, cationic, amphoteric ionic and nonionic surfactants can be used, but nonionic surfactants are preferable because they have less influence on the cleaning surface. is the best. Specifically, polyoxyalkylene alkyl ether, polyoxyalkylene alkylphenol ether, polyoxyalkylene alkyl fatty acid ester, polyoxyalkylene allylphenol ether, polyoxyalkylene sorbitan fatty acid ester, polyoxyalkylene alkylamine, sorbitan fatty acid ester, polyoxyalkylene Among these, nonionic surfactants with an average HLB of 4 to 15 exhibit particularly excellent effects. Here, polyoxyalkylene refers to a polymer of ethylene oxide, propylene oxide, or butylene oxide.

The amount of surfactant added is desirably about 0.01 to 50% by weight, particularly 3 to 40% by weight. If the amount is 0.01% by weight, the cleaning effect of adding the surfactant will not be realized, while if it exceeds 50% by weight, the surfactant will remain on the cleaning surface and affect the properties of the cleaned parts. It may have an impact.

In addition, the cleaning composition of the present invention may optionally contain various alcohols such as ethanol and glycol; esters such as acetoacetic acid, methyl oleate, and benzyl acetate; amines, and phenols. Antioxidants, corrosion inhibitors, water, etc. may be added.

The cleaning composition of the present invention can be manufactured by mixing in a conventional manner.

The method for cleaning liquid crystals using the cleaning composition of the present invention is not particularly limited, but for example, the cleaning composition of the present invention may be used for ultrasonic cleaning, immersion cleaning, and finally rinsing with a solvent or warm water. An efficient cleaning method includes a method in which the method is performed continuously.

Alternatively, various cleaning methods such as a vibration method and a spray method may be used.

〔Example〕

Hereinafter, the present invention will be explained in more detail with reference to Examples.
The present invention is not limited to these.

Example 1 Thickness 1. A spacer is provided on the In+m glass plate, and this is covered with another glass plate to form a sandwich structure with a gap of 10 to 20 μm.
1565, manufactured by Merck Japan) and sealed to create a cell.

This cell was immersed in the cleaning solution shown in Table 1 at 40° C. for 1 minute, and then subjected to ultrasonic cleaning in the same solution for 5 minutes. Thereafter, the amount of liquid crystal remaining on the glass plate of the cell and around the cell was measured using a polarizing microscope, and the cleanability was evaluated using the following evaluation criteria. Next, the cell was taken out from the cleaning solution and immersed in an ion exchange tank at 40° C. for 1 minute, and the rinsing properties were measured using a polarizing microscope and evaluated according to the following evaluation criteria.

These results are shown in Table 1.

(Evaluation criteria) Liquid crystal removability ◎: Very good with no liquid crystal residue ○: Good with almost no liquid crystal residue △: Slightly poor liquid crystal residue X: Poor rinsing property with liquid crystal residue, very poor Good: Good: Slightly Poor: Bad Below margins [Effects of the Invention] The cleaning composition of the present invention has excellent cleaning power and rinsing performance for liquid crystals attached to glass substrates, jigs, tools, etc., or stains containing liquid crystals. Furthermore, since it does not use fluorocarbons, it does not pollute the environment and is highly safe.

that's all

Claims (1)

[Claims] 1. Contains 50% by weight or more of a hydrocarbon having 8 to 20 carbon atoms and a viscosity of 0.5 to 10 cp at 20°C, and 0.01 to 50% by weight of a surfactant. A liquid crystal cleaning composition. 2. The liquid crystal cleaning composition according to claim 1, wherein the hydrocarbon is one or more selected from alkylbenzenes, olefins, olefin polymers, and compounds having a cyclohexene ring. 3. The liquid crystal cleaning composition according to claim 1, wherein the surfactant is a nonionic surfactant with an average HLB of 4 to 15.