A red photoresist composition with good thermal stability

Abstract

The present invention discloses a red photoresist composition with good thermal stability, which comprises, by mass percentage: 80%-83% of a solvent; 5%-9% of a resin; 0.3%-0.6% of an initiator; 4%-5% of a monomer; 0.2%-0.28% of an additive; and 6%-8% of an anthraquinone compound. In the present invention, an anthraquinone compound with a special structure is used as a pigment, which improves the dispersibility of the photoresist in the solvent while ensuring a high transmittance, so that the light source will not be blocked by the pigment, thereby causing a decrease in the panel contrast. At the same time, the thermal stability of the photoresist is also improved, which is beneficial to subsequent process conditions.

Description

Technical Field

[0001] The present invention belongs to the field of semiconductors, relates to photoresist technology, and specifically relates to a red photoresist composition with good thermal stability. Background Art

[0002] At present, there are many common types of display panels in China. Among them, thin-film transistor liquid crystal displays (LCDs) are more prominent and have become the mainstream trend in the market in recent years. As a photoresist composed of three primary colors of red, green, and blue (RGB), color photoresist is one of the core technologies for realizing liquid crystal colorization, which directly determines the image quality, resolution, color saturation, and contrast of the display. Due to the characteristics of mature technology, low cost, and low power consumption of liquid crystal displays, they have great potential in the commercial field; even in the home color TV and emerging technology decoration markets, they are widely favored.

[0003] In color photoresist, the color is provided by the pigment. However, the pigment is insoluble and exists as small particles dispersed in an organic solvent, having a certain light-blocking property, which will cause a decrease in light transmittance and a decrease in the contrast of the LCD. In addition, limited by the liquid crystal panel equipment, the dynamic range and color gamut range of LCD displays are relatively narrow, and they cannot truly restore the colors in people's eyes. At present, the x and y axes of CIE1931 are usually used to represent the chromaticity coordinates, and the gray value is represented by Y. These three can form a complete color gamut space. However, to express colors more vividly and brightly, mainly use pigments with excellent performance to be efficiently dispersed in the solvent. And due to the limitations of the subsequent process conditions, the thermal stability performance of the color paste is also particularly important.

[0004] However, the existing photoresist still cannot meet the relatively ideal requirements of dispersion and thermal stability, so a new technical solution is needed to solve this problem. Summary of the Invention

[0005] Object of the Invention: In order to overcome the deficiencies in the prior art, the present invention provides a red photoresist composition with good thermal stability, which uses an anthraquinone compound with a special structure as the pigment. While ensuring high transmittance, it improves the dispersion of the photoresist in the solvent at the same time, so that the light source will not be blocked by the pigment, thereby causing a decrease in the panel contrast. At the same time, it also improves the thermal stability of the photoresist, which is beneficial to the subsequent process conditions.

[0006] Technical Solution: To achieve the above object, the present invention provides a red photoresist composition with good thermal stability, which includes the following components by mass percentage:

[0007] Solvent 80%-83%;

[0008] Resin 5%-9%;

[0009] Initiator: 0.3% - 0.6%;

[0010] Monomer: 4% - 5%;

[0011] Additive: 0.2% - 0.28%;

[0012] Anthraquinone compound: 6% - 8%;

[0013] The structural formula of the anthraquinone compound is as follows:

[0014]

[0015] Furthermore, in the anthraquinone compound, the R group is an alkyl group or an alkoxy group. The alkyl group contains 1 - 20 carbon atoms, such as -C 8 H 18 -, -C 10 H 22 -, -C 12 H 26 -.

[0016] Furthermore, in the anthraquinone compound, the R group is an aryl group with substituents or a hydrogen atom.

[0017] Furthermore, the aryl group is a group composed of a benzene ring and a naphthalene ring.

[0018] Furthermore, the substituent on the aryl group is one of a hydroxyl group, an amino group, or an alkaryl group.

[0019] Furthermore, the solvent is one or more of propylene glycol methyl ether acetate, diethylene glycol methyl ethyl ether, or dimethylformamide.

[0020] Furthermore, the resin is a copolymer resin formed by one or more of alkyl methacrylate, aryl methacrylate, hydroxy acrylic resin, ethyl acrylate, n-butyl acrylate, methyl methacrylate succinate, epoxy acrylate, epoxy resin methacrylate, and epoxy alkyl methacrylate.

[0021] Furthermore, the initiator is one or more of acetophenones, benzophenones, methyl benzoates, benzophenones, and bisimidazoles. Specifically, it includes 2-hydroxy-methylphenylpropan-1-one, 1-hydroxycyclohexyl phenyl ketone, 2-methyl-1-(4-methylthiophenyl)-2-morpholin-1-one, 4-methylbenzophenone, benzoin dimethyl ether, ethyl 4-(N,N-dimethylamino)benzoate, methyl o-benzoylbenzoate. The bisimidazoles include hexaarylbiimidazoles.

[0022] Furthermore, the monomer is an acrylate or methacrylate monomer.

[0023] Further, the additive is one or more of an ultraviolet absorber, an emulsifier, an antifoaming agent, a leveling agent, a matting agent, and a light stabilizer.

[0024] Advantages: Compared with the prior art, the anthraquinone compound of the red photoresist composition of the present invention has high stability in organic solvents, is relatively simple to synthesize, and has high stability to light, heat, acid and alkali. Using the anthraquinone compound with a special structure as a pigment, while ensuring high transmittance, the dispersibility of the photoresist in the solvent is improved, so that the light source will not be blocked by the pigment, resulting in a decrease in the panel contrast. At the same time, the thermal stability of the photoresist is also improved, which is beneficial to subsequent process conditions. Description of the Drawings

[0025] Figure 1 It is a particle size test result diagram of the red photoresist composition. Detailed Embodiments

[0026] The present invention will be further clarified below with reference to the drawings and specific embodiments. It should be understood that these embodiments are only used to illustrate the present invention and not to limit the scope of the present invention. After reading the present invention, various equivalent modifications of the present invention by those skilled in the art fall within the scope defined by the appended claims of this application.

[0027] Example 1:

[0028] This example provides a red photoresist composition with good thermal stability, which includes the following components by mass percentage:

[0029]

[0030] The structural formula of the anthraquinone compound is as follows:

[0031]

[0032] Among them, the R group is an alkyl group, the alkyl group contains 8 carbon atoms, and in this example, it is -C 8 H 18 -, and the additive is a combination of an ultraviolet absorber, an emulsifier, and an antifoaming agent.

[0033] Example 2:

[0034] This example provides a red photoresist composition with good thermal stability, which includes the following components by mass percentage:

[0035]

[0036] The structural formula of the anthraquinone compound is as follows:

[0037]

[0038] Among them, the R group is an alkoxy group containing 12 carbon atoms, which is -OC 12 H 26 -, and the additive is a combination of an emulsifier, an antifoaming agent, and a leveling agent.

[0039] Example 3:

[0040] This example provides a red photoresist composition with good thermal stability, which includes the following components by mass percentage:

[0041]

[0042] The structural formula of the anthraquinone compound is as follows:

[0043]

[0044] Among them, the R group is an aryl group with substituents, and the aryl group is selected from the group consisting of a benzene ring and a naphthalene ring, where the substituent on the aryl group is a hydroxyl group, and the additive is a combination of an emulsifier, an antifoaming agent, a leveling agent, and a light stabilizer.

[0045] Example 4:

[0046] In this example, the performance of the red photoresist composition obtained in Example 1 was tested. Specifically: The well-mixed color paste was coated, and after the post-baking time passed 10 minutes and increased by 5 minutes each time, finally, the color chip was tested using LCF-Color. The test results are shown in Table 1. It can be seen that the results of the 5 tests are not very different, and ΔEab is less than 3, with a small color deviation, thus verifying that the red photoresist composition has good thermal stability.

[0047] Table 1

[0048]

[0049] In this example, the Pigment particle size in the color paste was tested. The color paste and PGMEA were mixed evenly in five ratios of 8:2, 6:4, 5:5, 4:6, and 2:8, and finally the particle size was tested. The test results are referred to Figure 1 . It can be seen that the test results of the particle size are all less than 50nm, thus verifying that the red photoresist composition has good dispersibility.

Claims

1. A red photoresist composition with good thermal stability, It is characterized in that The components include the following in percentage by mass: The structural formula of anthraquinone compounds is as follows: The R group in the anthraquinone compound is an alkyl group or an aryl group containing a substituent, the alkyl group contains 1 to 20 carbon atoms, and the substituent on the aryl group is one of a hydroxyl group, an amino group or an alkylaryl group.

2. A red photoresist composition with good thermal stability according to claim 1, It is characterized in that The aryl group is a group consisting of a benzene ring and a naphthalene ring.

3. A red photoresist composition with good thermal stability according to claim 1, It is characterized in that The solvent is one or more of propylene glycol methyl ether acetate, diethylene glycol methyl ethyl ether or dimethylformamide.

4. A red photoresist composition with good thermal stability according to claim 1, It is characterized in that The resin is a copolymer resin formed by one or more of alkyl methacrylate, aryl methacrylate, hydroxy acrylic resin, ethyl acrylate, n-butyl acrylate, succinic acid methacrylate, epoxy acrylate, methacrylate epoxy resin and epoxy methacrylate alkyl ester.

5. A red photoresist composition with good thermal stability according to claim 1, It is characterized in that The initiator is one or more of acetophenones, benzophenones, methyl benzoate, benzophenones and bisimidazoles.

6. A red photoresist composition with good thermal stability according to claim 1, It is characterized in that The monomer is an acrylate or methacrylate monomer.

7. A red photoresist composition with good thermal stability according to claim 1, It is characterized in that The additive is one or more of an ultraviolet absorber, an emulsifier, a defoamer, a leveling agent, a matting agent, and a light stabilizer.

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