TWI727371B - Polarizer structure and manufacturing method thereof - Google Patents

Abstract

A polarizer structure and a manufacturing method thereof are provided. The polarizer structure includes a polarizer composite layer. The polarizer composite layer includes a polarizer film, a first adhesive layer, and a first protective layer. The first adhesive layer is formed on a first surface of the polarizer film. The first protective layer is formed on the first adhesive layer. The polarizer composite layer includes an inorganic ammonium salt.

Description

Polarizing plate structure and manufacturing method thereof

The content of this disclosure relates to a polarizing plate structure and a manufacturing method thereof.

Polarizing plates are one of the main components of liquid crystal display devices. With the popularization of liquid crystal display devices, the demand for polarizing plates is also rapidly increasing, for example, in mobile phones, tablet computers, wearable devices, car display panels and other related applications.

Therefore, especially with the popularization of the application of liquid crystal display devices in automotive display panels, there are more requirements for the maintenance or improvement of the performance of the polarizer, such as the transmittance, polarization, and color reproducibility of the polarizer. Equivalent properties, weather resistance, thinning, and reduction of manufacturing costs, etc.

The content of this disclosure relates to a polarizing plate structure and a manufacturing method thereof. In the embodiment, the polarizer composite layer of the polarizer structure contains inorganic ammonium salt, and the inorganic ammonium salt can react with the unreacted hydrophilic functional group in the material of the polarizer, thereby reducing the unreacted hydrophilic functional group in the polarizer. In order to improve the stability of the material of the polarizer in a high temperature environment, the material of the polarizer is less prone to material deterioration in a high temperature environment, and the deterioration of the polarizer that turns red or yellow is reduced. Therefore, the composite layer of the polarizer can be improved. High temperature resistance and weather resistance.

According to an embodiment of the disclosure, a polarizing plate structure is provided. The polarizing plate structure includes a polarizing plate composite layer. The polarizer composite layer includes a polarizer, a first adhesive layer and a first protective layer. The first adhesive layer is formed on the first surface of the polarizer. The first protective layer is formed on the first adhesive layer. The polarizing plate composite layer contains an inorganic ammonium salt.

According to an embodiment of the present disclosure, a manufacturing method of a polarizing plate structure is provided. The manufacturing method of the polarizing plate structure includes the following steps: providing a polarizer; forming a first adhesive layer composition, the first adhesive layer composition including polyvinyl alcohol and inorganic ammonium salt; coating the first adhesive layer composition on the polarizer Forming a first adhesive layer on the first surface; and attaching the first protective layer to the first adhesive layer.

In the embodiment of the present disclosure, the polarizer composite layer of the polarizer structure contains inorganic ammonium salt, and the inorganic ammonium salt can react with the unreacted hydrophilic functional groups in the material of the polarizer, thereby reducing the unreacted hydrophilicity in the polarizer. The number of functional groups can improve the stability of the material of the polarizer in a high temperature environment, make the polarizer less prone to material deterioration in a high temperature environment, and reduce the deterioration of the polarizer from turning red or yellow, so it can improve the polarization The high temperature resistance and weather resistance of the composite layer of the board.

Various implementation methods or examples are presented below to implement the different features of the present disclosure, in which specific elements and their arrangement are described to illustrate the present disclosure. Of course, these are only examples and should not be used to limit the scope of the present disclosure. For example, when the description mentions that the first element is formed on the second element, it may include an embodiment in which the first element is in direct contact with the second element, or it may include other elements formed on the first element. The embodiment with the second element, where the first element and the second element are not in direct contact. In different embodiments and drawings, the same or similar component symbols are used to represent the same or similar components, but these same or similar component symbols are only used to describe the content of the disclosure simply and clearly, and do not represent the differences discussed. There is a specific relationship between the embodiments and/or structures. It is worth noting that the embodiments are only used to illustrate the technical features of the disclosure, and are not used to limit the scope of patent application of the disclosure. Those with ordinary knowledge in the technical field will be able to make equal modifications and changes based on the following description without departing from the spirit of the present disclosure. In some embodiments, some elements are omitted from the drawings to clearly show the technical features of the disclosure.

In addition, terms related to space may be used, such as "below", "below", "above", "between" and similar terms. These terms are related to It is convenient to describe the relationship between one element(s) or feature and another element(s) or feature in the diagram. These spatial relation words include the different orientations of the device in use or operation, as well as the orientation described in the diagram . The device may be turned to different orientations (rotated by 90 degrees or other orientations), and the space-related adjectives used therein can also be interpreted in the same way. It should be understood that additional process steps may be included before, during, or after some process steps, and some process steps described in some embodiments may be replaced by other process steps in the method of other embodiments. Or delete.

FIG. 1 is a schematic cross-sectional view of a polarizing plate structure according to an embodiment of the disclosure. As shown in Figure 1, the polarizing plate structure includes a polarizing plate composite layer 100A. The polarizer composite layer 100A includes a polarizer 110, a first adhesive layer 120 and a first protective layer 130. The first adhesive layer 120 is formed on the first surface 110 a of the polarizer 110, and the first protective layer 130 is formed on the first adhesive layer 120. The first protective layer 130 is attached to the first surface 110 a of the polarizer 110 by the first adhesive layer 120. The polarizing plate composite layer 100A contains an inorganic ammonium salt.

In some embodiments, the polarizer 110 is, for example, an iodine-type polarizer, and the iodine-type polarizer includes a polyvinyl alcohol (PVA) resin film and iodine adsorbed and guided into/on the polyvinyl alcohol (PVA) resin film. Polyvinyl alcohol (PVA) resin film can be made by saponifying polyvinyl acetate resin. Examples of polyvinyl acetate resins include a single polymer of vinyl acetate, that is, polyvinyl acetate, a copolymer of vinyl acetate, and other monomers that can be copolymerized with vinyl acetate. Examples of other monomers that can be copolymerized with vinyl acetate include unsaturated carboxylic acids (such as acrylic acid, methacrylic acid, ethyl acrylate, n-propyl acrylate, methyl methacrylate), olefins (such as ethylene, propylene, 1 -Butene, 2-methacrylic acid), vinyl ether (e.g. ethyl vinyl ether, methyl vinyl ether, n-propyl vinyl ether, isopropyl vinyl ether), unsaturated sulfonic acid (e.g. vinyl sulfonic acid, vinyl Sodium sulfonate) and so on. In the embodiment of the present disclosure, the polarizing plate composite layer 100A is, for example, a continuous roll or sheet material.

In some embodiments, the first protective layer 130 may be a single-layer or multi-layer structure. The material of the first protective layer 130 may be, for example, a thermoplastic resin with excellent transparency, mechanical strength, thermal stability, and moisture barrier properties. Thermoplastic resins may include cellulose resins (e.g., triacetate cellulose (TAC), diacetate cellulose (DAC), acrylic resins (e.g., poly(methyl methacrylate)). , PMMA), polyester resin (for example, polyethylene terephthalate (PET), polyethylene naphthalate), olefin resin, polycarbonate resin, cycloolefin resin, directional stretchability Polypropylene (oriented-polypropylene, OPP), polyethylene (PE), polypropylene (PP), cyclic olefin polymer (COP), cyclic olefin copolymer (COC) , Polycarbonate (PC), or any combination of the above. In addition, the material of the first protective layer 130 can also be, for example, (meth)acrylic, urethane, acrylic urethane Thermosetting resins or ultraviolet curing resins such as acid ester, epoxy, silicone, etc. In addition, the first protective layer 130 may be further subjected to surface treatment, such as anti-glare treatment, anti-reflection treatment, hard Coating treatment, electrification prevention treatment or anti-fouling treatment, etc.

According to the embodiment of the present disclosure, the polarizing plate composite layer 100A includes an inorganic ammonium salt, and the inorganic ammonium salt can react with the unreacted hydrophilic functional group (for example, OH functional group) in the material of the polarizer 110, thereby reducing the number of polarizers. The number of unreacted hydrophilic functional groups in the 110 is to improve the stability of the material of the polarizer 110 in a high temperature environment, so that the polarizer 110 is less prone to material deterioration in a high temperature environment, and reduces the redness or change of the polarizer 110. The deterioration of yellow can improve the high temperature resistance and weather resistance of the polarizing plate composite layer 100A.

Specifically, according to some embodiments of the present disclosure, the inorganic ammonium salt in the polarizing plate composite layer 100A and the unreacted OH functional group of the polyvinyl alcohol in the polarizer 110 can react to reduce the unreacted OH of the polyvinyl alcohol. The degradation of the functional group caused by the dehydration reaction can improve the stability of the polyvinyl alcohol in the polarizer 110 in a high temperature environment, and reduce the deterioration of the polarizer 110 from turning red or yellow, so the polarizing plate can be effectively improved The high temperature resistance and weather resistance of the composite layer 100A.

In some embodiments, the solubility of the inorganic ammonium salt in water is, for example, greater than 150 grams per 100 milliliters of water (g/100 mL H ₂ O) (the number of grams dissolved in 100 milliliters of water). In some embodiments, the solubility of the inorganic ammonium salt in water is, for example, greater than 180 g/100 mL H ₂ O.

According to some embodiments of the present disclosure, when the solubility of the inorganic ammonium salt to water is greater than 150 g/100mLH ₂ O or 180 g/100mLH ₂ O, it can be compatible with the hydrophilic material (for example, polyvinyl alcohol) of the polarizer 110 Better compatibility, not only can provide better reactivity, but also can more effectively improve the stability of the hydrophilic material of the polarizer 110, and at the same time will not cause the precipitation of solid components due to too low solubility, so it can maintain Good optical quality of the polarizing plate composite layer 100A.

In some embodiments, the ammonium ion content in the polarizing plate composite layer 100A is, for example, 3 ppm to 20 ppm. In some embodiments, the ammonium ion content in the polarizing plate composite layer 100A is, for example, 5 ppm to 15 ppm. In some embodiments, the ammonium ion content in the polarizing plate composite layer 100A is, for example, 8 ppm to 13 ppm. In some embodiments, when the polarizer composite layer 100A has a three-layer structure composed of the polarizer 110, the first adhesive layer 120 and the first protective layer 130, the ammonium ion content in the three-layer structure is, for example, 3 ppm to 17 ppm , Or 4ppm to 13ppm, or 8ppm to 11ppm.

According to some embodiments of the present disclosure, when the ammonium ion content of the inorganic ammonium salt is within the above-mentioned specific range, the ammonium ion content is sufficient to react with unreacted OH functional groups, so that the polarizing plate composite layer 100A can have a good The high temperature resistance and weather resistance characteristics of the ammonium ion, and the content of ammonium ions will not adversely affect the high temperature resistance and post-resistance characteristics of the polarizing plate composite layer 100A due to the excessive content.

In some embodiments, the inorganic acid ion content in the polarizing plate composite layer 100A is, for example, 10 ppm to 60 ppm. In some embodiments, the inorganic acid ion content in the polarizing plate composite layer 100A is, for example, 20 ppm to 50 ppm. In some embodiments, the inorganic acid ion content in the polarizing plate composite layer 100A is, for example, 28 ppm to 44 ppm. In some embodiments, when the polarizer composite layer 100A has a three-layer structure composed of the polarizer 110, the first adhesive layer 120 and the first protective layer 130, the content of inorganic acid ions in the three-layer structure is, for example, 10 ppm to 50ppm, or 17ppm to 42ppm, or 26ppm to 38ppm.

In some embodiments, the first adhesive layer 120 of the polarizing plate composite layer 100A may include a water-based adhesive. Generally, for example, polyvinyl alcohol-based resin or urethane resin is used as the main component of the water-based adhesive, and in order to improve The composition can be made by adding a crosslinking agent such as an isocyanate compound or an epoxy compound or a curable compound afterwards.

In some embodiments, when the main component of the water-based adhesive is a polyvinyl alcohol-based resin, in addition to partially saponified polyvinyl alcohol and fully saponified polyvinyl alcohol, it can also be used, such as carboxyl modified polyvinyl alcohol and ethyl acetate. A modified polyvinyl alcohol, methylol modified polyvinyl alcohol, and amine modified polyvinyl alcohol are modified polyvinyl alcohol resins. Such aqueous solutions of polyvinyl alcohol-based resins can be used as water-based adhesives, and the concentration of polyvinyl alcohol-based resins in the water-based adhesives is usually 1-10 parts by mass relative to 100 parts by mass of water, and 1~ 5 parts by mass is better.

In some embodiments, in the aqueous adhesive composed of an aqueous solution of a polyvinyl alcohol resin, in order to improve the adhesiveness as described above, it can be mixed with polyvalent aldehydes, water-soluble epoxy resins, melamine-based compounds, and zirconium oxide. It is a hardening compound like a series compound and a zinc compound. In some embodiments, the aforementioned components constituting the water-based adhesive are usually used in a state of being dissolved in water.

In some embodiments, the thickness of the polarizer 110 is, for example, 10-30 micrometers (μm), preferably 17-22 micrometers. In some embodiments, the thickness of the first adhesive layer 120 is generally 0.001 to 5 μm, preferably 0.01 μm or more, preferably 2 μm or less, and more preferably 1 μm or less. If the first adhesive layer 120 is too thick, the appearance of the polarizing plate composite layer 100A is likely to become poor. In some embodiments, the thickness of the first protection layer 130 is, for example, 20 to 80 microns, preferably 25 to 60 microns, and more preferably 25 to 40 microns.

In some embodiments, the first adhesive layer 120 of the polarizing plate composite layer 100A includes polyvinyl alcohol (for example, the aforementioned polyvinyl alcohol-based resin) and the aforementioned inorganic ammonium salt.

In some embodiments, the inorganic ammonium salt includes, for example, ammonium nitrate.

According to some embodiments of the present disclosure, ammonium nitrate has a fairly high solubility in water (190 g/100mLH ₂ O), and can effectively react with the unreacted OH functional groups of the polyvinyl alcohol in the polarizer 110 without After the drying process of the polarizing plate composite layer 100A, solid precipitates are generated, which not only improves the stability of the polyvinyl alcohol in the polarizer 110 in a high temperature environment, but also improves the high temperature and weather resistance characteristics of the polarizer composite layer 100A, and still The good optical characteristics and display appearance of the polarizing plate composite layer 100A can be maintained.

In some embodiments, the polarizing plate composite layer 100A may further include a water-soluble zinc salt. In some embodiments, the water-soluble zinc salt content in the polarizing plate composite layer 100A is, for example, 2 ppm to 8 ppm.

In some embodiments, the water-soluble zinc salt includes zinc chloride, for example.

In some embodiments, the polarizing plate composite layer 100A does not include organic ammonium salt. In some embodiments, the polarizing plate composite layer 100A does not include a water-soluble organic ammonium salt. For example, in some embodiments, the polarizing plate composite layer 100A does not include ammonium acetate.

FIG. 2 is a schematic cross-sectional view of a polarizing plate structure according to another embodiment of the present disclosure. In this embodiment, the same or similar component numbers are used for the same or similar component numbers as in the previous embodiment, and the related description of the same or similar components please refer to the foregoing description, which will not be repeated here.

As shown in FIG. 2, in the embodiment, the polarizing plate structure includes a polarizing plate composite layer 100. The polarizer composite layer 100 includes a polarizer 110, a first adhesive layer 120, a first protective layer 130, a second adhesive layer 140 and a second protective layer 150. The second adhesive layer 140 is formed on the second surface 110b of the polarizer, and the second surface 110b is opposite to the first surface 110a. The second protective layer 150 is formed on the second adhesive layer 140. The material and characteristics of the second protection layer 150 are similar to the aforementioned first protection layer 130, and will not be repeated here. In some embodiments, the thickness of the second protective layer 150 is, for example, 20 to 80 microns, preferably 25 to 40 microns.

In some embodiments, the second adhesive layer 140 of the polarizing plate composite layer 100 also includes the aforementioned polyvinyl alcohol and the aforementioned inorganic ammonium salt. For example, the first adhesive layer 120 and the second adhesive layer 140 of the polarizing plate composite layer 100 may both include ammonium nitrate.

In some embodiments, when the polarizer composite layer 100 is a five-layer structure composed of a polarizer 110, a first adhesive layer 120, a first protective layer 130, a second adhesive layer 140, and a second protective layer 150, the five The ammonium ion content in the layer structure is, for example, 3 ppm to 20 ppm. In some embodiments, the ammonium ion content in the polarizing plate composite layer 100 having the aforementioned five-layer structure is 5 ppm to 15 ppm. In some embodiments, the ammonium ion content in the polarizing plate composite layer 100A having the aforementioned five-layer structure is, for example, 8 ppm to 13 ppm.

FIG. 3 is a schematic cross-sectional view of another polarizing plate structure according to an embodiment of the present disclosure. In this embodiment, the same or similar component numbers are used for the same or similar component numbers as in the previous embodiment, and the related description of the same or similar components please refer to the foregoing description, which will not be repeated here.

As shown in FIG. 3, in the embodiment, the polarizing plate structure 200 may include the aforementioned polarizing plate composite layer 100. As shown in FIG. 3, in the embodiment, the polarizing plate structure 200 may further include a protective layer 210, a release layer 220 and a pressure sensitive adhesive layer 230.

In some embodiments, as shown in FIG. 3, the protective layer 210 may include a protective film 211 and a glue layer 212, and the glue layer 212 is formed on the protective film 211. In some embodiments, as shown in FIG. 3, the protective layer 210 is attached to the first surface 100a of the polarizing plate composite layer 100 through the adhesive layer 212, and the release layer 220 is attached to the polarizer through the pressure sensitive adhesive layer 230. The second surface 100b of the board composite layer 100 is opposite to the first surface 100a.

In some embodiments, as shown in FIG. 3, the protective layer 210 is attached to the first protective layer 130 of the polarizing plate composite layer 100 through the adhesive layer 212, and the release layer 220 is attached to the first protective layer 130 of the polarizing plate composite layer 100 through the pressure sensitive adhesive layer 230. The second protective layer 150 of the polarizing plate composite layer 100.

In some embodiments, the adhesive layer 212 is, for example, a pressure-sensitive adhesive layer. In some embodiments, the adhesive layer 212 and/or the pressure-sensitive adhesive layer 220 may include an ammonium salt, such as a quaternary ammonium salt. The quaternary ammonium salt added here is, for example, used to improve the antistatic effect.

In some embodiments, the thickness of the protective layer 210 is, for example, 20-60 microns, preferably 36-40 microns. In some embodiments, the thickness of the adhesive layer 212 is, for example, 10-30 microns, preferably 13-22 microns. In some embodiments, the thickness of the pressure sensitive adhesive layer 220 is, for example, 10-30 microns, preferably 17-22 microns. In some embodiments, the thickness of the release layer 220 is, for example, 20-60 microns, preferably 36-40 microns.

FIG. 3A is a schematic cross-sectional view of a polarizing plate structure according to another embodiment of the present disclosure. In this embodiment, the same or similar component numbers are used for the same or similar component numbers as in the previous embodiment, and the related description of the same or similar components please refer to the foregoing description, which will not be repeated here.

As shown in FIG. 3A, in the embodiment, the polarizing plate structure 200A may include the aforementioned polarizing plate composite layer 100A. As shown in FIG. 3A, in the embodiment, the polarizing plate structure 200A may further include a protective layer 210, a release layer 220, and a pressure-sensitive adhesive layer 230. In some embodiments, as shown in FIG. 3A, the protective layer 210 is attached to the first surface 100a of the polarizing plate composite layer 100A through the adhesive layer 212, and the release layer 220 is attached to the polarizer through the pressure sensitive adhesive layer 230. The second surface 100b of the board composite layer 100A is opposite to the first surface 100a.

In some embodiments, as shown in FIG. 3A, the protective layer 210 is adhered to the first protective layer 130 of the polarizing plate composite layer 100A through the adhesive layer 212, and the release layer 220 is adhered to the first protective layer 130 of the polarizing plate composite layer 100A through the pressure sensitive adhesive layer 230 The polarizer 110 and the pressure sensitive adhesive layer 230 of the polarizer composite layer 100A directly contact the polarizer 110 and the release layer 220.

According to some embodiments of the present disclosure, the polarizer composite layer 100A includes inorganic ammonium salt, and the polarizer 110 of the polarizer composite layer 100A is directly attached to the release layer 220 through the pressure sensitive adhesive layer 230. As a result, the inorganic The ammonium salt can improve the stability of the material of the polarizer 110 in a high temperature environment, improve the high temperature resistance and weather resistance of the polarizer composite layer 100A, and the overall polarizer structure 200A has a thinner structure.

FIG. 4 is a schematic diagram of a manufacturing method of a polarizing plate structure according to an embodiment of the disclosure. In this embodiment, the same or similar component numbers are used for the same or similar component numbers as in the previous embodiment, and the related description of the same or similar components please refer to the foregoing description, which will not be repeated here.

As shown in FIG. 4, a polarizer 110 is provided, and a first adhesive layer composition is formed. The first adhesive layer composition includes polyvinyl alcohol and the aforementioned inorganic ammonium salt.

In some embodiments, in the first adhesive layer composition, relative to 100 parts by weight of polyvinyl alcohol, the first adhesive layer composition may include 0.5-15 parts by weight of inorganic ammonium salt. In some embodiments, in the first adhesive layer composition, relative to 100 parts by weight of polyvinyl alcohol, the first adhesive layer composition may include 1-12 parts by weight of inorganic ammonium salt.

In some embodiments, the first adhesive layer composition further includes the aforementioned water-soluble zinc salt.

In some embodiments, a second adhesive layer composition may be formed, and the second adhesive layer composition may include polyvinyl alcohol and the aforementioned inorganic ammonium salt.

In some embodiments, in the second adhesive layer composition, relative to 100 parts by weight of polyvinyl alcohol, the second adhesive layer composition may include 0.5-15 parts by weight of inorganic ammonium salt. In some embodiments, in the second adhesive layer composition, relative to 100 parts by weight of polyvinyl alcohol, the second adhesive layer composition may include 1-12 parts by weight of inorganic ammonium salt.

In some embodiments, in the total of the first adhesive layer composition and the second adhesive layer composition, relative to 100 parts by weight of polyvinyl alcohol, the second adhesive layer composition may include 1-20 parts by weight of inorganic ammonium. salt. In some embodiments, in the total of the first adhesive layer composition and the second adhesive layer composition, relative to 100 parts by weight of polyvinyl alcohol, the second adhesive layer composition may include 1.5-15 parts by weight of inorganic ammonium. salt.

In an embodiment, the first adhesive layer composition may be directly coated on the first surface 110a of the polarizer 110 to form the first adhesive layer 120 to form the polarizer composite layer 100A as shown in FIG. 1. In some embodiments, as shown in FIG. 4, the first adhesive layer composition may be directly coated on the first surface 110a of the polarizer 110 by the coating device 60A to form the first adhesive layer 120.

In some embodiments, as shown in FIG. 4, the second adhesive layer composition may be coated on the second surface 110b of the polarizer 110 by the coating device 60B to form the second adhesive layer 140. The polarizer 110 The second surface 110b of the polarizer is opposite to the first surface 110a of the polarizer 110.

Then, in some embodiments, as shown in FIG. 4, the first protective layer 130 may be attached to the first adhesive layer 120, and the second protective layer 150 may be attached to the second adhesive layer 140. For example, in some embodiments, as shown in Figure 4, for example, the first protective layer 130 and the second protective layer 150 can be attached to the polarizer by a pressing roller set including a roller 51 and a roller 53 110 on.

Then, in some embodiments, as shown in FIG. 4, the pressure-sensitive adhesive layer 230 may be coated on the second protective film 150 by the pressure-sensitive adhesive coating device 70.

Then, in some embodiments, as shown in FIG. 4, the pressure-sensitive adhesive layer 230, the release layer 220, and the protective layer 210 may be bonded by a pressing roller set including a roller 81 and a roller 83. So far, the polarizing plate structure 200 as shown in FIG. 3 is formed.

The following examples will be further explained. The following lists the composition and characteristic measurement results of the polarizing plate composite layer of several embodiments and comparative examples to illustrate the characteristics of the polarizing plate composite layer of the polarizing plate structure prepared by the application of the present disclosure. The following are examples of the five-layer structure (first protective layer/first adhesive layer/polarizer/second adhesive layer/second protective layer) as shown in Figure 3, where the first protective layer and the second protective layer All use triacetate cellulose (TAC). However, the following embodiments are for illustrative purposes only, and should not be interpreted as limitations on the implementation of the disclosure.

Table 1 lists the total components and contents of the first adhesive layer composition and the second adhesive layer composition of Examples 1 to 8 and Comparative Examples 1 to 5, and Table 2 lists the characteristic measurement of the polarizing plate composite layer And observation results. In the following Examples 1 to 8 and Comparative Examples 1 to 5, sodium glyoxylate is used as a bridging agent, and the content thereof is 0.3 parts by weight.

In Table 2, "105°C heat-resistant time" means the time taken for the finished polarizing plate composite layer to be placed in a temperature environment of 105°C and to observe its obvious yellowing. "Heat resistance" means a comprehensive evaluation of the heat resistance time, optical properties, and whether there is a significant change in appearance. Among them, "◎" means very good heat resistance as a whole, "○" means good heat resistance, "Δ "Indicates that it has acceptable heat resistance, and "X" indicates that it has poor heat resistance.

In Table 2, the test condition of the adhesion force is to cut the prepared polarizer composite layer into a sample with a size of 130*25mm, and confirm with N=3, and the evaluation method is to put the cut sample into the cut The blade of the knife was peeled 30mm from the end in the longitudinal direction, and the peeled part was clamped by the clamp part of the tester to obtain the average peeling force, where "○" means good adhesion. In Table 2, the "monomer transmittance (%)" was tested using a spectrophotometer (manufactured by JASCO Corporation, model V-7100) equipped with an integrating sphere.

Table 1 The main components of the first adhesive layer composition and the second adhesive layer composition Proportion within the five-story structure Polyvinyl alcohol (parts by weight) Additives (parts by weight) Ammonium content (ppm) Nitric acid content (ppm) Ammonium Nitrate Zinc chloride Ammonium acetate Example 1 100 1.5 0 0 5.66 19.52 Example 2 100 3 0 0 8.63 29.74 Example 3 100 5 0 0 10.92 37.62 Example 4 100 7 0 0 12.32 42.44 Example 5 100 10 0 0 13.63 46.96 Example 6 100 3 1.5 0 6.97 24.02 Example 7 100 5 1.5 0 9.25 31.87 Example 8 100 7 1.5 0 10.76 37.05 Comparative example 1 100 0 0 1.5 5.89 0 Comparative example 2 100 0 0 3 8.98 0 Comparative example 3 100 0 0 5 11.36 0 Comparative example 4 100 0 1.5 0 0 0 Comparative example 5 100 0 0 0 0 0

Table 2 Adhesion (N/25mm) Single penetration rate (%) Polarization (%) Appearance before heat resistance test 105°C heat resistance time (hours) Heat resistance characteristics Example 1 ○ 42.3 99.994 No abnormality 650 ○ Example 2 ○ 42.3 99.994 No abnormality 750 ◎ Example 3 ○ 42.3 99.993 No abnormality 750 ◎ Example 4 ○ 42.3 99.994 No abnormality 750 ◎ Example 5 ○ 42.2 99.993 No abnormality 650 ○ Example 6 ○ 42.3 99.994 No abnormality 750 ◎ Example 7 ○ 42.2 99.994 No abnormality 750 ◎ Example 8 ○ 42.3 99.994 No abnormality 750 ◎ Comparative example 1 ○ 40.2 99.993 White precipitate 650 ○ Comparative example 2 ○ 40.1 99.994 White precipitate 650 ○ Comparative example 3 ○ 40.3 99.994 White precipitate 650 ○ Comparative example 4 ○ 42.3 99.994 No abnormality 500 Δ Comparative example 5 ○ 42.2 99.994 No abnormality 120 X

It can be seen from the results in Table 2 that only ammonium acetate is added to the adhesive layer of the samples of Comparative Examples 1 to 3, and the polarizing plate composite layer produced is obviously visible with white solid precipitates, which shows that ammonium acetate cannot interact with the polarized light. The unreacted hydrophilic functional groups in the film react to achieve the effect of improving the stability of the material of the polarizer in a high temperature environment, and the white precipitates also seriously affect the appearance and display effect of the composite layer of the polarizer.

Furthermore, as shown in the results of Table 2, Comparative Example 4 only added zinc chloride, and although there were no solid precipitates, its heat resistance characteristics were not good, and the expected heat and weather resistance effects could not be achieved. Comparative Example 5 has the worst heat and weather resistance characteristics.

Relatively speaking, as shown in the results of Table 2, the samples of Examples 1 to 8 all have inorganic ammonium salts added to the adhesive layer, so they all have relatively excellent monomer transmittance, polarization and heat resistance performance.

Although the content of the disclosure is disclosed in the foregoing embodiment, it is not intended to limit the content of the disclosure. Those with ordinary knowledge in the technical field to which the content of this disclosure belongs can make some changes and modifications without departing from the spirit and scope of the content of this disclosure. Therefore, the scope of protection of the content of this disclosure shall be subject to the scope of the attached patent application.

51, 53, 81, 83: Optical film process equipment 60A, 60B: coating device 70: Pressure Sensitive Glue Coating Device 100, 100A: Polarizing plate composite layer 100a, 110a: first surface 100b, 110b: second surface 110: Polarizer 120: The first adhesive layer 130: the first protective layer 140: second adhesive layer 150: second protective layer 200, 200A: Polarizing plate structure 210: protective layer 211: Protective film 212: Glue layer 220: release layer 230: pressure sensitive adhesive layer

In order to make the features and advantages of the content of the disclosure more obvious and understandable, the following is a detailed description of different embodiments together with the accompanying drawings: FIG. 1 is a schematic cross-sectional view of a polarizing plate structure according to an embodiment of the disclosure. FIG. 2 is a schematic cross-sectional view of a polarizing plate structure according to another embodiment of the present disclosure. FIG. 3 is a schematic cross-sectional view of a polarizing plate structure according to another embodiment of the present disclosure. FIG. 3A is a schematic cross-sectional view of a polarizing plate structure according to another embodiment of the present disclosure. FIG. 4 is a schematic diagram of a manufacturing method of a polarizing plate structure according to an embodiment of the disclosure.

100A: Polarizing plate composite layer

110a: first surface

110: Polarizer

120: The first adhesive layer

130: the first protective layer

Claims (13)

A polarizing plate structure includes: a polarizing plate composite layer, including: a polarizer; a first adhesive layer formed on a first surface of the polarizer; and a first protective layer formed on the first adhesive layer On the layer, the polarizing plate composite layer includes an inorganic ammonium salt, and the ammonium ion content in the polarizing plate composite layer is 3 ppm to 20 ppm. The polarizing plate structure described in claim 1, wherein the polarizing plate composite layer further includes: a second adhesive layer formed on a second surface of the polarizer, and the second surface of the polarizer is opposite to On the first surface of the polarizer; and a second protective layer formed on the second adhesive layer. The polarizing plate structure described in item 1 or 2 of the scope of patent application, wherein the ammonium ion content in the polarizing plate composite layer is 8 ppm to 13 ppm. According to the polarizing plate structure described in item 1 or 2 of the scope of patent application, the content of inorganic acid radicals in the composite layer of the polarizing plate is 10 ppm to 60 ppm. The polarizing plate structure described in item 1 or 2 of the scope of the patent application, wherein the inorganic acid radical ion content in the polarizing plate composite layer is 20 ppm to 50 ppm. According to the polarizing plate structure described in item 1 or 2, wherein the first adhesive layer and/or the second adhesive layer include polyvinyl alcohol and the inorganic ammonium salt. According to the polarizing plate structure described in item 1 or 2 of the scope of patent application, the polarizing plate composite layer further includes a water-soluble zinc salt. The polarizing plate structure described in item 2 of the scope of patent application further includes: a protective layer, including a protective film and a glue layer, the glue layer is formed on the protective film, and the protective layer is bonded by the glue layer To a first surface of the polarizer composite layer; a release layer; and a pressure-sensitive adhesive layer, the release layer being bonded to a second surface of the polarizer composite layer by the pressure-sensitive adhesive layer, the The second surface of the polarizing plate composite layer is opposite to the first surface of the polarizing plate composite layer. The polarizing plate structure described in item 8 of the scope of patent application, wherein the adhesive layer and/or the pressure-sensitive adhesive layer includes a quaternary ammonium salt. A method for manufacturing a polarizing plate structure includes: providing a polarizer; forming a first adhesive layer composition, the first adhesive layer composition including polyvinyl alcohol and an inorganic ammonium salt; coating the first adhesive layer composition Spreading on a first surface of the polarizer to form a first adhesive layer; and attaching a first protective layer to the first adhesive layer. According to the manufacturing method of the polarizing plate structure described in item 10 of the scope of patent application, in the first adhesive layer composition, relative to 100 parts by weight of polyvinyl alcohol, the first adhesive layer composition includes 0.5-15 weight Parts of the inorganic ammonium salt. According to the manufacturing method of the polarizing plate structure described in claim 10, the first adhesive layer composition further includes a water-soluble zinc salt. As described in item 10 of the scope of patent application, the manufacturing method of the polarizing plate structure further includes: forming a second adhesive layer composition, the second adhesive layer composition including polyvinyl alcohol and the inorganic ammonium salt; The adhesive layer composition is coated on a second surface of the polarizer to form a second adhesive layer, the second surface of the polarizer is opposite to the first surface of the polarizer; and a second protective layer It is attached to the second adhesive layer.

Images