JP2001264736A - Protective coating film - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a protective coating film, used in a liquid crystal display device, with low viscosity and having adhesive strength to resist rapid change of temperature and an environment of high temperature and high humidity. SOLUTION: The protective coating film, used in the liquid crystal display device, contains at least one out of an epoxy resin, having no absorption peak with about <=10 cm-1 half-value width caused by a benzene group in 1,400-1,600 cm-1 wave number region based on IR spectroscopic analysis, and an epoxy- acrylic modified resin, having one or more vinyl groups and one or more epoxy groups in a molecule.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a protective film for a liquid crystal display device, and more particularly, to repairing a scratch on a glass substrate of a liquid crystal display panel of a liquid crystal display device or repairing a terminal portion of a liquid crystal display panel of the liquid crystal display device. The present invention relates to a protective film used for reinforcement, moisture proof, antireflection, and the like.

[0002]

BACKGROUND ART STN (S uper T wisted N ematic ) method or a liquid crystal display module of the TFT (T hin F ilm T ransister ), is widely used as a display device such as a notebook personal computer. These LCD modules are
The liquid crystal display panel has a drain driver and a gate driver disposed therearound, and a backlight unit that irradiates the liquid crystal display panel. Generally, in a manufacturing process of a liquid crystal display panel, a glass substrate surface of the liquid crystal display panel may be damaged during transportation of the liquid crystal display panel. Conventionally, in such a case, a protective film is embedded in a scratch generated on the glass substrate surface of the liquid crystal display panel to repair the scratch, that is, the liquid crystal display panel is regenerated and used. Conventionally, a synthetic resin has been used as the protective film.

[0003]

In general, the synthetic resin used for the above-mentioned protective film is required to have transparency, heat resistance for adhesion, weather resistance, etc., but the conventional synthetic resin used for the protective film is required. Since the resin has a high viscosity, it takes time to penetrate into scratches and the like, and has poor heat resistance and weather resistance, and has a problem that the protective film is peeled off. When transparency is required, a synthetic resin such as acryl is often used as a synthetic resin used for the above-mentioned protective film, but there is a problem that the synthetic resin such as acryl is inferior in reliability. Was. Furthermore, synthetic resins such as acryl are conspicuous in yellow with respect to transparency, do not have sufficient transparency, and do not have sufficient adhesion reliability. The present invention
An object of the present invention is to provide a protective film used for a liquid crystal display device, which has a low viscosity, a rapid change in temperature, and a high temperature and high humidity environment. It is an object of the present invention to provide a protective film having a constant adhesive strength underneath. The above and other objects and novel features of the present invention will become apparent from the description of the present specification and the accompanying drawings.

[0004]

SUMMARY OF THE INVENTION Among the inventions disclosed in the present application, the outline of a representative one will be briefly described.
It is as follows. That is, the present invention provides a protective coating for use in a liquid crystal display device, when subjected to infrared spectroscopic analysis, anti-value width of about 10cm caused from the wave number 1400 cm ^-1 to the benzene group is between 1600 cm ^-1 Epoxy resin having no absorption peak of ^-1 or less, and 1 in one molecule
It comprises at least one of an epoxy-acrylic modified resin having one or more vinyl groups and one or more epoxy groups. Examples of the compound having a vinyl group include a compound having an acrylo group, a methacrylo group (α-methylacrylo group), a compound having methyl methacrylate as a main raw material, and a compound having an acryloyl group.

The present invention also relates to a protective film used for a liquid crystal display device, wherein the protective film is a nuclear magnetic resonance NM.
Chemical shift value (δ) in the R spectrum is 6 ppm to 9 pp
m, and at least one of an epoxy resin having no aromatic-specific peak and an epoxy-acryl-modified resin having one or more vinyl groups and one or more epoxy groups in one molecule. And Further, the present invention relates to a protective film used for a liquid crystal display device, wherein the protective film is an epoxy resin having a non-resonant cyclic structure with an electron orbit and an aliphatic cyclic structure having a non-resonant electron orbit. Or having an aliphatic chain and one or more vinyl groups in the molecule.
Epoxy-acrylic modified resin having one or more epoxy groups, and characterized in that the electron orbital comprises at least one of a non-resonant aliphatic cyclic structure or a glycidyl epoxy resin having an aliphatic chain. I do.

The present invention is also a protective film used for a liquid crystal display device, wherein the protective film has a yellowness defined by the following formula of 40% or less. Yellowness = (RCL−BCL) × 100 / RCL (%) where RCL = transmittance of red (700 nm) BCL = transmittance of blue (400 nm) In the present invention, the viscosity at a temperature of 25 ° C. is 120 ±
It is characterized by containing a non-aromatic epoxy resin of 10 cPs or less. Further, the present invention is a protective coating used for a liquid crystal display device, wherein a depth of a transparent substrate having a gap of 0.5 μm or less from a surface entrance is 1 μm or more with respect to a scratch on the transparent substrate. And

By using the protective coating of each of the above-mentioned means for repairing a flaw in the glass substrate surface of the liquid crystal display panel of the liquid crystal display device, the permeability to the flaw and the transparency are improved.
In addition, it is possible to improve the reliability with respect to thermal shock, weather resistance and the like of adhesiveness. The protective coating of each of the above means,
By using it to reinforce the liquid crystal display panel of the liquid crystal display device, or to reinforce the terminal part of the liquid crystal display panel of the liquid crystal display device, it is possible to improve the reliability with respect to the transparency, adhesion thermal shock, weather resistance, etc. It becomes possible.

[0008]

Embodiments of the present invention will be described below in detail with reference to the drawings. In all the drawings for describing the embodiments, components having the same functions are denoted by the same reference numerals, and repeated description thereof will be omitted. Embodiment 1 FIG. 1 is a cross-sectional view of a main part showing a case where a protective film is used for repairing a flaw generated on a glass substrate surface of a liquid crystal display panel. In the figure, SUB1, SUB2
Denotes a glass substrate, and a pixel electrode, a thin film transistor, and the like are formed on the glass substrate (SUB1) to form a TFT substrate. Further, a counter substrate, a color filter and the like are formed on a glass substrate (SUB2) to form a filter substrate. In the liquid crystal display panel, the TFT substrate and the filter substrate are overlapped with a predetermined gap therebetween, and the two substrates are bonded together by a frame-shaped sealing material (S) provided near the peripheral portion between the two substrates. The liquid crystal (LC) is sealed and sealed inside the sealing material (S) between the two substrates through the liquid crystal sealing opening provided in a part of the sealing material (S), and a polarizing plate is attached outside the two substrates. It is configured with In FIG. 1,
TM indicates a terminal portion.

FIG. 1 shows a liquid crystal display panel before a polarizing plate is attached to the outside of both substrates, and FIG. 1 shows a width of a filter substrate on a glass substrate (SUB2). Has a size of about 1 to 50 μm and a depth of about 15 μm
This shows the case where has occurred. Therefore, a case where the scratch 10 is repaired by using the protective coating of the present embodiment will be described. As the protective film in this embodiment, an epoxy resin containing an aliphatic ring, which is a non-aromatic epoxy resin, is used. First, an epoxy resin containing an aliphatic ring (DER 736 manufactured by Dow Chemical Co., Ltd.) is added to a curing agent (Eacon manufactured by Asahi Denka Co., Ltd.).
H-261) and stirred for about 5 minutes with a stirrer.
The mixture was allowed to stand for 5 minutes to remove bubbles generated during the stirring. Here, the viscosity of the epoxy resin was 22 cPs, and the viscosity of the curing agent was 12 cPs. Next, the above-mentioned protective coating was dropped on the scratch 10 on the substrate surface of the glass substrate (SUB2), and was penetrated into the scratch 10. In this case, since the protective coating of the present embodiment had a very low viscosity, it quickly penetrated into the scratches 10 and the scratches became inconspicuous in a few minutes.

Then, after removing an excess protective film with a razor blade or the like, the area around the wound 10 was wiped with acetone. Finally, in a clean bake furnace that blows nitrogen into the furnace,
After curing at 00 ° C for 24 hours, the glass substrate (SUB
The scratch 10 generated on the substrate surface in 2) was covered with a protective coating (EP) and repaired. By the above steps, the temperature of the liquid crystal panel from which the scratch 10 has been repaired is raised from -50 ° C to 120 ° C in one hour, and from 120 ° C to -50 ° C in one hour.
200 tests to lower the temperature to
A test was conducted for 500 hours in an environment at a temperature of 90 ° C. and a humidity of 90%, but no problem such as peeling occurred. in this way,
The protective film according to the present embodiment has a sudden change in temperature and an adhesive force that can be kept under a high-temperature and high-humidity environment.

That is, the protective film of the present embodiment can improve the reliability with respect to adhesion thermal shock, weather resistance, and the like. Further, the repair of the scratched surface by the protective coating of the present embodiment is also good, and the weather resistance with respect to transparency and adhesion is significantly improved, thereby making it possible to repair relatively deep scratches. . Examples of the curing agent include not only those described above but also Epicure grade 114 (oiled shell epoxy), which is a modified alicyclic amine-based curing agent, and curing agents classified as latent curing agents (imidazole or imidazole-based curing agents). A catalyst based curing agent such as antimony-based, phosphorus-based, and boron-based curing agents that can be cured by light or pressure), an acid anhydride-based curing agent, and a polyamide-based curing agent may be used.
In particular, since the latent curing agent of the catalyst system represented by antimony, phosphorus, and boron systems has a very small amount to the main agent as compared with the amine curing agent, there is an advantage that the low viscosity of the main agent is maintained. . If you use an amine system,
Epicure grade 114, which is an alicyclic curing agent, is preferred. In addition, the mixture of the epoxy resin and the curing agent of the present invention, further fillers and beads are mixed, or by using a solid as a curing agent to increase the viscosity, as a resin for repairing chipping of the end face of the substrate. It is also possible to use. This is because the resin does not drip from the end face of the substrate due to the increase in viscosity.

[Embodiment 2] The protective coating of the present embodiment is obtained by adding an aliphatic ring-containing epoxy resin (ie, diglycidin ether of cyclohexane dimethanol) represented by the following chemical formula (1) to a modified aliphatic polyamine. And a resin mixed with a curing agent consisting of Using the protective film of the present embodiment, the flaw 10 generated on the glass substrate surface of the liquid crystal display panel was repaired by the method described in the first embodiment. The protective film of the present embodiment has a yellowness of 1 described later.
When the transmittance is 6% or less and the transmittance is 70 ± 2.5% / cm or more, the transparency is high and the transparency can be improved. Even with the protective film of the present embodiment, it was possible to satisfactorily repair the flaw 10 generated on the glass substrate surface of the liquid crystal display panel, and furthermore, the transparency was greatly improved, so that relatively deep flaws could be repaired.

[0013]

Embedded image ........... (Formula 1)

The protective film of this embodiment has a chemical shift value (δ) of about 6 to 9 ppm (ie, a chemical shift value (τ = 10) in the NMR spectrum when structural analysis is performed using nuclear magnetic resonance. -Δ) has no peak at around 1 to 4 ppm). The aromatics have a chemical shift value (δ) of 6 ppm to 9 ppm (a chemical shift value (τ) of 1 ppm).
Is known to have a peak around 4 ppm), but since the protective coating of this embodiment is non-aromatic,
Naturally, no peak was measured in this range. Here, tetramethylsilane ((CH ₃ ) ₄ Si) was used as a reference substance. Note that, in the present embodiment, an epoxy-acryl-modified resin having one or more vinyl groups and one or more epoxy groups in one molecule can be used instead of the epoxy resin containing an aliphatic ring. is there.

Specific examples of the ethoxy resin usable for the protective coating of the present embodiment include diglycidyl hexahydrophthalate, diglycidyl cyclohexane-1,3-dicarboxylate, diglycidyl cyclohexane-1,
Examples thereof include 4-dicarboxylate, diglycidylcyclopentane-1,3-dicarboxylate, and diglycidylcyclobutane-1,3-dicarboxylate. However, the present invention is not limited to the aforementioned chemical structure. Absent. Further, these isomers may be used, and two or more kinds may be used in combination.

[Embodiment 3] The protective film of this embodiment is obtained by adding an aliphatic ring-containing epoxy resin represented by the following chemical formula (2) to the curing agent of Embodiment 1 (EH manufactured by Asahi Denka Co., Ltd.).
-261). Using the protective film of the present embodiment, the method described in the first embodiment described above,
Was repaired. The protective coating of the present embodiment has a relatively low glass transition temperature (Tg) of 35 ° C. For this reason, the protective film of the present embodiment can satisfactorily repair the scratch 10 generated on the glass substrate surface of the liquid crystal display panel, and can further improve the adhesion, thereby improving the reliability with respect to adhesion. Thereby, peeling of the protective coating does not occur.

[0017]

Embedded image ... (Chemical 2)

FIG. 2 shows the infrared spectrum of the protective film of the present embodiment.
4 shows an infrared spectrum of the result of optical analysis. Of this embodiment
The protective coating has a wave number of 310 when infrared spectroscopy is performed.
0cm ^-1From 2990cm^-1High vibration with cyclic alkane during
CH or CH shifted to the power side_TwoDue to the stretching vibration of
There is an infrared absorption peak and the wave number is 1450.1 cm
^{- 1}There is an infrared absorption peak in the vicinity. This peak is the reversal width
Is about 25cm^-1And broad peaks,
It is not caused by sensation, but by scissors of alkane CH
It is an infrared absorption peak due to motion. FIG. 3 shows the benzene group
Of typical bisphenol A type epoxy resin
3 shows an infrared spectrum as a result of infrared spectroscopy. Shown in FIG.
As shown, if absorption by benzene C = C, benzene
C = C has a sharper absorption peak than alkane CH.
In most cases, the half width is 10 cm^-1It is as follows.

[Embodiment 4] The protective film of this embodiment is obtained by adding a glycidyl-based epoxy resin (DER732 manufactured by Dow Chemical Co.) represented by the following chemical formula (3) to the curing agent of Embodiment 1. Is mixed. Using the protective film of the present embodiment, the flaw 10 generated on the glass substrate surface of the liquid crystal display panel was repaired by the method described in the first embodiment. Even with the protective film of the present embodiment, it was possible to satisfactorily repair the flaws 10 generated on the glass substrate surface of the liquid crystal display panel, and further, the transparency was greatly improved, so that relatively deep flaws could be repaired. As described above, as the protective coating of the present invention, not only an epoxy resin having a cyclic structure but also a glycidyl-based epoxy resin can be applied.

[0020]

Embedded image Where n is 5 or 6.

The common names of the epoxy resins that can be used for the protective coating of this embodiment include sorbitol polyglycidyl ether, polyglycerol polyglycidyl ether, pentaerythritol polyglycidyl ether, diglycerol polyglycidyl ether, and glycerol polyglycidyl. Ether, trimethylolpropane polyglycidyl ether, ethylene, propylene glycol diglycidyl ether, propylene, polypropylene glycol diglycidyl ether, allyl glycidyl ether, polybutadiene diglycidyl ether, secondary butyl cyclohexane monoglycidyl ether, polyethylene glycol epichlorohydrin 0 Polyglycidyl ether of 2 mol adduct, 0-1 mol of glycerin / epichlorohydrin Polyglycidyl ethers of pressurized product,
Examples include polyethylene glycol diglycidyl ether, butoxy polyethylene glycol monoglycidyl ether, and glycidol, but the present invention is not limited to the above-mentioned chemical structure. Further, these isomers may be used, and two or more kinds may be used in combination.

The most typical chemical general formula of the ethoxy resin that can be used for the protective film of the present embodiment is shown in the following chemical formula (4). In the following chemical formula (4), A is a divalent non-aromatic organic group, or an inorganic or organic group whose electron orbit is non-resonant (provided that there is a non-resonant side chain, branch or cyclic structure. It does not matter.).

[0023]

Embedded image (Embodiment 4) In addition, as an ethoxy resin that can be used for the protective film of the present embodiment, a typical chemical general formula is represented by the following chemical formula (5),
Alternatively, those represented by the following chemical formula (6) can also be used. In the following chemical formula (5), B is a trivalent non-aromatic organic group, or an inorganic or organic group whose electron orbit is non-resonant (provided that there is a non-resonant side chain, branch or cyclic structure. It does not matter.). In the following chemical formula (6),
C is a tetravalent non-aromatic organic group or an inorganic or organic group whose electron orbit is non-resonant (however, a non-resonant side chain, a branched or cyclic structure may be present).

[0024]

Embedded image ... (Chemical formula 5)

[0025]

Embedded image (Chemical Formula 6) As described above, as an ethoxy resin usable in the present invention, when there is basically no acryl group in the molecule, two glycidyl groups are contained in one molecule. If it is above, it can be applied to the present invention, but it is preferably 4 or less. This is because if the glycidyl group is too large, the molecular weight increases and the viscosity of the resin increases. The molecular weight of the resin applicable in the present invention is generally 600 g / mol or less, and preferably, the molecular weight is 300 g / mol or less. Further, in order to make a high viscosity base material applicable to the present invention, as a diluent for lowering the viscosity, 1
There is also a method of mixing -methyl-4- (2-methyloxiranyl) -7-oxysabicyclo [4.1.0] heptane, cyclohexene oxide, vinylcyclohexene monoepoxide, or the like.

Specific names of the ethoxy resin usable for the protective coating of this embodiment include 1,3-bis (N, N-diglycidylaminomethyl) cyclohexane, tetraglycidyldiaminedihexylmethane, butanedioldiglycidylether , Vinylcyclohexene dioxide, diglycidyl aniline, trimethylolpropane triglycidyl ether, glycerin triglycidyl ether, neopentyl glycol diglycidyl ether,
Examples include 1,6-hexadiol ether, hydrogenated bisphenol A diglycidyl ether, acryl diglycidyl ether, allyl glycidyl ether, glycidyl acrylate, glycidyl methacrylate, and diglycidyl dimer acid. However, the present invention is not limited to this. Further, these isomers may be used, and two or more kinds may be used in combination.

In each of the above embodiments, the case where the protective film is used for repairing the scratch 10 has been described.
As shown in the figure, the glass substrate (SUB
1, SUB2), may be used in the protective coating of each of the above embodiments, or as shown in FIG. 5, to reinforce the terminal portion TM of the liquid crystal display panel. May be used. FIG.
Are the glass substrates (SUB1, SUB) of the liquid crystal display panel.
FIG. 4 is a cross-sectional view of a main part showing a state in which the entire periphery of the liquid crystal display panel is covered with a protective coating for reinforcement of 2). FIG. 5 is a cross-sectional view of an essential part showing a state in which the terminal portion of the liquid crystal display panel is covered with a protective film in order to reinforce the terminal portion TM of the liquid crystal display panel.

Hereinafter, the characteristics (viscosity, adhesiveness, colorlessness, and transparency) of the protective film of the present invention will be described. (Viscosity) Scratches 10 on the glass substrate surface of the liquid crystal display panel
In order to form a thin film having little influence on the permeability to the scratches 10 and the optical properties, it is essential that the protective film for repairing the film has a low viscosity. When the viscosity of the stock solution of the protective coating of each of the above embodiments was measured by EL viscosity, the epoxy resin of the above first embodiment (DER73 manufactured by Dow Chemical Company) was used.
6) is 22 cPs (mPa · s), the epoxy resin of the second embodiment shown in the chemical formula (1) is 23 cPs, and the epoxy resin of the third embodiment shown in the chemical formula (2) is 125 cPs.
cPs. For the protective coating, the stock solution needs to be 160 cP or less, preferably 120 ± 10 cP.
It is desirably not more than Ps. The lower the viscosity, the better.

After the scratch 10 formed on the glass substrate surface of the liquid crystal display panel is repaired by the protective coating of each of the above embodiments, SEM analysis (Scanning Electrode) of the cross section of the substrate at the scratched portion is performed.
n Microscope) and its X-ray analysis were performed to examine the cross-sectional shape of the wound and how deep the resin penetrated the wound. The protective coating of each of the above embodiments is a SEM
In a photograph (black-and-white photograph), the surroundings other than the scratches tended to be black while the surroundings were gray. SEM-EDX (Scanning Electrode)
n Microscope-Energy Dispersive Spectrometry) was measured and the structural elements were compared. As a result, peaks of carbon specific to the resin and chlorine as an impurity were detected only in the black portions. In particular, with the protective coating of the first embodiment, it was observed that the resin had penetrated the entire wound. The penetration depth reached as much as 15 μm. From the SEM photograph of the cross section, the gap between the scratches was about 0.5 μm or less.

(Adhesion) The glass transition temperature (Tg) (glass transition temperature) of the protective coating of each of the above embodiments was measured. As a result, the glass transition temperature (Tg) was -20 ± 4 ° C. for the protective coating of the first embodiment, 10 ± 5 ° C. for the protective coating of the second embodiment, and 32 for the protective coating of the third embodiment. ± 6 ° C. The glass transition temperature (Tg) of the protective coating is −35 ± 5 ° C. or more and 100 ± 5 ° C. or less (−3
5 ± 5 ° C. ≦ Tg ≦ 100 ± 5 ° C.), and preferably has a glass transition temperature (Tg) of 0 ° C. or higher and 75 ° C. or higher.
It is better to be ± 5 ° C. or less (0 ° C. ≦ Tg ≦ 75 ± 5 ° C.). When the glass transition temperature (Tg) of the protective coating is higher than this range, the adhesive strength of the protective coating against environmental changes such as temperature and humidity is easily affected by stress and strain, and the risk of peeling increases. Conversely, if the glass transition temperature (Tg) of the protective coating is lower than this range, the protective coating is likely to be sticky and the resin shape is not stable.

(Colorless, Transparency) When the absorption spectrum of the protective coating of each of the above embodiments was measured with visible light, the transmittance monotonously decreased from blue (400 nm) to red (700 nm). In order for the protective coating not to be colored, it is desirable that the transmittance in the visible light range is constant. In particular, in order for the protective coating not to be colored yellow, it is necessary that the absorption of blue, which is a complementary color, be small. Preferably, blue (400 nm) transmittance and red (700 nm)
It is desirable that the yellowness defined by the following equation (1) be 40% or less, and preferably 5% or less, based on the difference from the transmittance in the above.

[0032]

## EQU00001 ## Yellowness = (RCL-BCL) .times.100 / RCL (%) (1) where RCL = transmittance of red (700 nm) BCL = transmittance of blue (400 nm) Yellow The degree of protection was 26% for the protective coating of the first embodiment, 16% for the protective coating of the second embodiment, and 29% for the protective coating of the third embodiment. In each of the above embodiments, the case where the protective film of the present invention is used for a liquid crystal display device has been described. However, the present invention is not limited to this. For example, repair of lens scratches, transparent glass and synthetic resin It is needless to say that the present invention can also be applied to a protective film for a transparent article such as an anti-reflection film or a reinforcing film. that's all,
Although the invention made by the inventor has been specifically described based on the above embodiment, the present invention is not limited to the above embodiment and can be variously modified without departing from the gist thereof. Of course.

[0033]

The effects obtained by typical ones of the inventions disclosed in the present application will be briefly described as follows. (1) According to the protective film of the present invention, it is possible to improve transparency and permeability to a wound. (2) According to the protective coating of the present invention, it is possible to improve the reliability with respect to the thermal shock of adhesion and weather resistance.

[Brief description of the drawings]

FIG. 1 shows a scratch generated on a glass substrate surface of a liquid crystal display panel.
It is principal part sectional drawing which shows the case where it repaired with the protective film.

FIG. 2 is an infrared spectrum showing a result of infrared spectroscopic analysis of the protective film according to the third embodiment of the present invention.

FIG. 3 is an infrared spectrum showing the result of infrared spectroscopy analysis of a typical bisphenol A type epoxy resin containing a benzene group.

FIG. 4 is a cross-sectional view of a main part showing a state where the entire periphery of the liquid crystal display panel is covered with a protective coating.

FIG. 5 is a cross-sectional view of a main part showing a state where a terminal portion of the liquid crystal display panel is covered with a protective film.

[Explanation of symbols]

10: scratch, EP: resin, SUB: transparent substrate, LC: liquid crystal, TM: terminal, S: sealant.

 ──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Shigeru Matsuyama 3300 Hayano Mobara-shi, Chiba F-term in the Display Group, Hitachi, Ltd. (Reference) 2H090 HB07X JB02 KA08 LA04

Claims (6)

[Claims] 1. A protective film used for a liquid crystal display device, wherein the protective film has a wave number of 1 when infrared spectroscopy is performed.
An epoxy resin having no absorption peak having a reversal width of about 10 cm ^-1 or less due to a benzene group between 400 cm ^-1 and 1600 cm ^-1 , and one or more vinyl groups and one or more epoxy resins in one molecule. A protective coating comprising at least one epoxy-acrylic modified resin having a group. 2. A protective film used for a liquid crystal display device, wherein the protective film has an aromatic compound having a chemical shift value (δ) of about 6 ppm to 9 ppm when structural analysis using nuclear magnetic resonance is performed. A protective coating comprising an epoxy resin having no group-specific peak, and at least one of an epoxy-acrylic modified resin having one or more vinyl groups and one or more epoxy groups in one molecule. . 3. A protective film used for a liquid crystal display device, wherein the protective film is an epoxy resin having a non-resonant cyclic structure of an electron orbit, an aliphatic cyclic structure of a non-resonant electronic orbit. An epoxy-acryl-modified resin having an aliphatic chain and having at least one vinyl group and at least one epoxy group in a molecule, and an aliphatic cyclic structure or an aliphatic chain having a non-resonant electron orbit. A protective coating comprising at least one of a glycidyl-based epoxy resin. 4. A protective film used for a liquid crystal display device, wherein the protective film has a yellowness defined by the following formula of 40% or less. Yellowness = (RCL−BCL) × 100 / RCL (%) where RCL = transmittance of red (700 nm) BCL = transmittance of blue (400 nm) 5. A protective film used for a liquid crystal display device, wherein said protective film has a viscosity at a temperature of 25 ° C. of 120 ± 5.
A protective coating comprising a non-aromatic epoxy resin of 10 cPs or less. 6. A protective film used for a liquid crystal display device, wherein said protective film has a depth of 1 mm from a surface entrance for a scratch on a transparent substrate having a gap of 0.5 μm or less.
A protective film having a thickness of at least μm.