Resin composition, polarizer, and display device

Abstract

To reduce an increase in the usage amount and a decrease in light transmittance caused by poor dispersion of light-diffusing particles.SOLUTION: The embodiment of the invention discloses a resin composition, a polarizer and a display device, a resin layer containing the resin composition is an adhesive layer, the resin composition comprises a first polymer and polymer modified whiskers dispersed in the first polymer, the polymer modified whiskers comprise whiskers and a second polymer connected to the surfaces of the whiskers, the first polymer and the second polymer are lipophilic polymers. The polymer modified whisker is obtained by connecting the surface of the whisker with the second polymer, and the first polymer and the second polymer are both lipophilic polymers, so that the dispersibility of the polymer modified whisker in the resin composition is improved, and when the resin composition is used for the polarizer 100, the actual usage amount of the polymer modified whiskers is reduced, and the loss of emergent light of the display device is reduced while the chromaticity visual angle of the display device is improved.SELECTED DRAWING: Figure 1

Description

Technical Field

[0001] The present invention relates to the field of displays, and particularly to a resin composition, a polarizer, and a display device.

Background Art

[0002] Conventionally, in order to expand the chromaticity viewing angle of a display device, a functional layer for expanding the chromaticity viewing angle is provided on a polarizer. However, the dispersibility of light-diffusing particles added to this functional layer in the functional layer is often poor. As a result, the light-diffusing particles gather in the functional layer, and the actual usage amount of the light-diffusing particles increases, and the light transmittance of the display device decreases.

[0003] Therefore, it is urgent to develop a resin composition, a polarizer, and a display device for solving the above technical problems.

Summary of the Invention

Means for Solving the Problems

[0004] The present invention provides a resin composition, a polarizer, and a display device that can reduce an increase in the actual usage amount and a decrease in the light transmittance of a display device due to poor dispersion of light-diffusing particles in a functional layer for expanding the chromaticity viewing angle.

[0005] The present invention provides a resin composition. The resin composition includes a first polymer, a polymer-modified whisker dispersed in the first polymer, the polymer-modified whisker including a whisker and a second polymer bonded to the surface of the whisker, the first polymer is a lipophilic polymer, and the second polymer is a lipophilic polymer.

[0006] Preferably, the whisker is at least one selected from the group consisting of a first type of whisker, a second type of whisker, a third type of whisker, a fourth type of whisker, and a fifth type of whisker, Along the direction of extension of the long axis of the first type of whisker, the change in the diameter of the first type of whisker is 0.3 microns or less. Along the direction of extension of the long axis of the second type of whisker, the change in the diameter of the central part of the second type of whisker is 1 micron or less, and along the direction away from the central part of the second type of whisker, the diameter of the first end of the second type of whisker gradually decreases, and the change in the diameter of the second end of the second type of whisker is 1 micron or less. Along the direction of extension of the long axis of the third type of whisker, the change in the diameter of the central part of the third type of whisker is 1 micron or less, and along the direction away from the central part of the third type of whisker, the diameter of the first end of the third type of whisker gradually decreases, and the diameter of the second end of the third type of whisker gradually decreases. The first end of the fourth type of whisker is sequentially connected to the second end of the fourth type of whisker, and the diameter of the fourth type of whisker gradually decreases along the direction from the first end of the fourth type of whisker toward the second end of the fourth type of whisker. The first end of the fifth type of whisker is sequentially connected to the second end of the fifth type of whisker, and the diameter of the first end of the fifth type of whisker gradually decreases along the direction away from the second end of the fifth type of whisker, and the diameter of the second end of the fifth type of whisker gradually decreases along the direction away from the first end of the fifth type of whisker.

[0007] Preferably, the long axis of the whisker is 10 microns or more, and the long axis of the whisker is 30 microns or less. The minimum diameter of the whisker is 0.5 microns or more, and the maximum diameter of the whisker is 2 microns or less.

[0008] Preferably, in the resin composition, the mass fraction of the polymer-modified whiskers is 1% or more, and the mass fraction of the polymer-modified whiskers is 26% or less.

[0009] Preferably, the second polymer comprises at least one of a polyacrylate group, an acrylate-acrylic acid copolymer group, a polycarboxylic acid water-soluble comb-shaped copolymer group, and a polydimethylsiloxane group.

[0010] Preferably, the second polymer contains the same groups as the first polymer, or the surface of the polymer-modified whisker contains the same groups as the homologue of the first polymer.

[0011] Preferably, the surface of the polymer-modified whisker further contains phosphorus.

[0012] Preferably, the surface of the polymer-modified whisker contains at least one of a phosphate group, a phosphite ester group, or a polyphosphate group.

[0013] Preferably, the surface of the polymer-modified whisker further contains a first metal, the first metal being at least one selected from the group consisting of calcium, barium, titanium, and aluminum.

[0014] Preferably, the surface of the polymer-modified whisker contains at least one of the following: a phosphate of the first metal, a phosphite complex of the first metal, or a polyphosphate complex of the first metal.

[0015] Preferably, the surface of the polymer-modified whisker contains at least one of the following: calcium phosphate, barium phosphite complex, barium polyphosphate complex, titanium phosphite complex, titanium polyphosphate complex, aluminum phosphite complex, and aluminum polyphosphate complex.

[0016] Preferably, in the polymer-modified whisker, the mass fraction of phosphorus is less than 7%.

[0017] Preferably, the polymer-modified whisker is at least one selected from the group consisting of a first type of whisker, a second type of whisker, a third type of whisker, a fourth type of whisker, and a fifth type of whisker. Along the direction of extension of the long axis of the first type of whisker, the change in the diameter of the first type of whisker is 0.3 microns or less. Along the direction of extension of the long axis of the second type of whisker, the change in the diameter of the central part of the second type of whisker is 1 micron or less, and along the direction away from the central part of the second type of whisker, the diameter of the first end of the second type of whisker gradually decreases, and the change in the diameter of the second end of the second type of whisker is 1 micron or less. Along the direction of extension of the long axis of the third type of whisker, the change in the diameter of the central part of the third type of whisker is 1 micron or less, and along the direction away from the central part of the third type of whisker, the diameter of the first end of the third type of whisker gradually decreases, and the diameter of the second end of the third type of whisker gradually decreases. The first end of the fourth type of whisker is sequentially connected to the second end of the fourth type of whisker, and the diameter of the fourth type of whisker gradually decreases along the direction from the first end of the fourth type of whisker toward the second end of the fourth type of whisker. The first end of the fifth type of whisker is sequentially connected to the second end of the fifth type of whisker, and the diameter of the first end of the fifth type of whisker gradually decreases along the direction away from the second end of the fifth type of whisker, and the diameter of the second end of the fifth type of whisker gradually decreases along the direction away from the first end of the fifth type of whisker.

[0018] Preferably, the ratio of the length of the major axis of the polymer-modified whisker to the diameter of the polymer-modified whisker is 1 or more, and the ratio of the length of the major axis of the polymer-modified whisker to the diameter of the polymer-modified whisker is 50 or less.

[0019] Preferably, the first polymer is selected from crystalline polymers, the ratio of the length of the major axis of the polymer-modified whisker to the diameter of the polymer-modified whisker is 1 or more, and the ratio of the length of the major axis of the polymer-modified whisker to the diameter of the polymer-modified whisker is 5 or less, or the first polymer is selected from amorphous polymers, the ratio of the length of the major axis of the polymer-modified whisker to the diameter of the polymer-modified whisker is 5 or more, and the ratio of the length of the major axis of the polymer-modified whisker to the diameter of the polymer-modified whisker is 15 or less.

[0020] Preferably, the first polymer is selected from crystalline polymers, and in the resin composition, the mass fraction of the polymer-modified whisker is 0.05% or more, and the mass fraction of the polymer-modified whisker is 2% or less, or the first polymer is selected from amorphous polymers, and in the resin composition, the mass fraction of the polymer-modified whisker is 2% or more, and the mass fraction of the polymer-modified whisker is 7% or less.

[0021] The present invention further provides a polarizer. The polarizer includes a resin layer containing the resin composition described above.

[0022] Preferably, the polarizer further includes a polarizing layer, a first protective layer, and a hard coat layer, the resin layer is an adhesive layer, the resin layer is adhered between the polarizing layer and the first protective layer, and the hard coat layer is located on the side of the first protective layer away from the polarizing layer, or The polarizer further includes a second protective layer, the second protective layer is located on a side away from the polarizing layer of the first protective layer, the resin layer is an adhesive layer, the resin layer is adhered between the first protective layer and the second protective layer, the hard coat layer is located on a side away from the polarizing layer of the second protective layer, or, The resin layer is any one of the polarizing layer, the first protective layer, the second protective layer, and the hard coat layer.

[0023] Preferably, the orthographic projection of the long axis of the polymer-modified whisker in the resin layer on the first plane has a first orientation angle, the orthographic projection of the absorption axis of the polarizing layer on the first plane has a second orientation angle, the average value of the difference between the first orientation angle and the second orientation angle is -15° or more, the average value of the difference between the first orientation angle and the second orientation angle is 15° or less, the first plane and the plane where the polarizing layer is located are parallel, and / or, There is an included angle between the long axis of the polymer-modified whisker and the first plane, the included angle is an acute angle, and the included angle is 40° or less.

[0024] The present invention further provides a display device. The display device includes a display panel, and a first polarizer disposed on the light-emitting side of the display panel and selected from the polarizers described above.

[0025] In the present invention, a polymer-modified whisker is obtained by bonding a second polymer to the surface of the whisker. Since both the first polymer and the second polymer are lipophilic polymers, the dispersibility of the polymer-modified whisker in the resin composition is improved. When the resin composition is used in a polarizer, the actual usage amount of the polymer-modified whisker is reduced, and at the same time, the chromaticity viewing angle of the display device is improved, and the loss of the emitted light of the display device is reduced.

[0026] To more clearly explain the technical concepts in the embodiments of the present invention, the drawings that need to be used in describing the embodiments are briefly introduced below. Clearly, the drawings in the following description represent only some embodiments of the present invention. Those skilled in the art can obtain other drawings based on these without any creative effort. [Brief explanation of the drawing]

[0027] [Figure 1] This is a schematic diagram of the first structure of a polarizer according to one embodiment of the present invention. [Figure 2] This is a second schematic diagram of a polarizer according to one embodiment of the present invention. [Figure 3] This is a schematic diagram of the third structure of a polarizer according to one embodiment of the present invention. [Figure 4] This is a schematic diagram of the fourth structure of a polarizer according to one embodiment of the present invention. [Figure 5] This is a schematic diagram of the fifth structure of a polarizer according to one embodiment of the present invention. [Figure 6] This is a schematic diagram of one display device according to one embodiment of the present invention. [Figure 7] This is a schematic diagram showing the morphology of polymer-modified whiskers in a resin composition according to an embodiment of the present invention. [Figure 8] Figure 7 shows the EDS analysis results for polymer-modified whiskers. [Modes for carrying out the invention]

[0028] Hereinafter, the technical proposals in embodiments of the present invention will be clearly and completely described with reference to the accompanying drawings of embodiments of the present invention. It is clear that the embodiments described are only a part of the embodiments of the present invention, and not all embodiments. All other embodiments that can be obtained by those skilled in the art without creative effort based on embodiments of the present invention are included within the scope of protection of the present invention. Furthermore, it should be understood that the specific embodiments for carrying out the invention described herein are used only to illustrate and explain the present invention and are not intended to limit the present invention. In the present invention, unless otherwise specified, terms indicating direction such as “up” and “down” usually refer to the vertical position of the device in actual use or working conditions, specifically the direction of the drawings in the drawings. On the other hand, “inside” and “outside” refer to the contour of the device.

[0029] Conventionally, the poor dispersion of light-diffusing particles in the functional layer used to expand the chromaticity viewing angle leads to the accumulation of light-diffusing particles in the functional layer, resulting in an increase in the actual amount of light-diffusing particles used and a decrease in the light transmittance of the display device.

[0030] Embodiments of the present invention provide a resin composition comprising a first polymer and polymer-modified whiskers dispersed within the first polymer, wherein the polymer-modified whiskers comprise a whisker and a second polymer bonded to the surface of the whisker, and the first polymer is a lipophilic polymer and the second polymer is a lipophilic polymer.

[0031] In the present invention, the second polymer is bonded to the surface of the whisker to form a polymer-modified whisker, and since both the second polymer and the first polymer are lipophilic polymers, the dispersibility of the polymer-modified whisker in the resin composition is improved, and when the resin composition is used in a polarizer, the actual amount of polymer-modified whisker used is reduced, as well as the chromaticity viewing angle of the display device and the loss of emitted light from the display device.

[0032] The present invention will be described below with reference to specific embodiments.

[0033] In this embodiment, since the first polymer is a lipophilic polymer and the second polymer is a lipophilic polymer, the lipophilicity of the surface of the polymer-modified whisker is improved, and it becomes easier to disperse in the first polymer. The lipophilicity of the first polymer, the second polymer, and the polymer-modified whisker can be measured by surface tension tests, contact angle tests, wettability tests, etc.

[0034] Specifically, the dispersibility of polymer-modified whiskers in the first polymer is stronger than the dispersibility of unmodified whiskers in the first polymer. In other words, the second mass of whiskers is the amount of whiskers added when aggregation begins to occur when dispersed in a first mass of the first polymer using a similar dispersion method, while the third mass of polymer-modified whiskers is the amount of whiskers added when aggregation begins to occur when dispersed in a first mass of the first polymer using a similar dispersion method, and the mass of whiskers in the third mass of polymer-modified whiskers is greater than the second mass. That is, more polymer-modified whiskers than unmodified whiskers can be dispersed in the same mass of the first polymer without aggregation.

[0035] In some embodiments, the whisker is at least one selected from the group consisting of a first type of whisker, a second type of whisker, a third type of whisker, a fourth type of whisker, and a fifth type of whisker.

[0036] Here, the shapes of the first type of whisker, the second type of whisker, the third type of whisker, the fourth type of whisker, and the fifth type of whisker are different from each other.

[0037] In some embodiments, the change in the diameter of the whisker along the direction of extension of its major axis represents the magnitude of the change in the whisker's diameter. Along the direction of extension of its major axis, the whisker has a first end and a second end. The first end of the whisker is sequentially connected to the second end of the whisker, or the whisker has a central portion connecting the first end and the second end. Here, the central portion of the whisker is a part of the whisker having a uniform diameter, i.e., the change in the diameter of the central portion of the whisker along the direction of extension of its major axis is 1 micron or less. The first end and the second end of the whisker are portions where the diameter of the whisker may change significantly.

[0038] In some embodiments, along the direction of extension of the long axis of the first type of whisker, the change in diameter of the first type of whisker is 0.3 microns or less, and may be, for example, 0 microns, 0.28 microns, 0.25 microns, 0.22 microns, 0.2 microns, 0.18 microns, 0.15 microns, 0.12 microns, 0.1 microns, 0.08 microns, 0.05 microns, 0.02 microns, etc. In some embodiments, along the direction of extension of the long axis of the first type of whisker, the diameter of the first end of the first type of whisker is the same as the diameter of the central part of the first type of whisker, and the diameter of the second end of the first type of whisker is the same as the diameter of the central part of the first type of whisker.

[0039] In some embodiments, the first type of whisker may be rod-shaped, and if the first type of whisker is rod-shaped, the cross-section of the first type of whisker in a plane perpendicular to the major axis of the first type of whisker is circular or elliptical. If the orthographic projection of the first type of whisker in a plane perpendicular to the major axis of the first type of whisker is elliptical, the diameter of the first type of whisker is the length of the major axis of the ellipse, and the ratio of the major axis to the minor axis of the ellipse is greater than 1 and less than or equal to 3, for example, 1.2, 1.5, 1.8, 2, 2.2, 2.5, 2.8, etc.

[0040] In some embodiments, along the direction of extension of the long axis of the second type of whisker, the change in the diameter of the central part of the second type of whisker is 1 micron or less, and may be, for example, 0 micron, 0.95 micron, 0.8 micron, 0.78 micron, 0.75 micron, 0.72 micron, 0.7 micron, 0.68 micron, 0.65 micron, 0.62 micron, 0.6 micron, 0.58 micron, 0.55 micron, 0.52 micron, 0.5 micron, 0.48 micron, 0.45 micron, 0.42 micron, 0.4 micron, 0.38 micron, 0.35 micron, 0.32 micron, 0.3 micron, 0.28 micron, 0.25 micron, 0.22 micron, 0.2 micron, 0.18 micron, 0.15 micron, 0.12 micron, 0.1 micron, 0.08 micron, 0.05 micron, 0.02 micron, etc. Along the direction away from the center of the second type of whisker, the diameter of the first end of the second type of whisker gradually decreases, and the change in the diameter of the second end of the second type of whisker is 1 micron or less, for example, 0 micron, 0.95 micron, 0.8 micron, 0.78 micron, 0.75 micron, 0.72 micron, 0.7 micron, 0.68 micron, 0.65 micron, 0.62 micron, 0.6 micron, 0.58 micron The diameters may be 0.55 microns, 0.52 microns, 0.5 microns, 0.48 microns, 0.45 microns, 0.42 microns, 0.4 microns, 0.38 microns, 0.35 microns, 0.32 microns, 0.3 microns, 0.28 microns, 0.25 microns, 0.22 microns, 0.2 microns, 0.18 microns, 0.15 microns, 0.12 microns, 0.1 microns, 0.08 microns, 0.05 microns, 0.02 microns, and the like. In some embodiments, the diameter of the first end of the second type of whisker gradually decreases along the direction away from the center of the second type of whisker, and the diameter of the second end of the second type of whisker is the same as the diameter of the center of the second type of whisker.

[0041] In some embodiments, the second type of whisker may be needle-shaped with a smaller diameter at one end.

[0042] In some embodiments, the orthographic projection of the second type of whisker in a plane perpendicular to the major axis of the second type of whisker may be circular or elliptical, and if the orthographic projection of the second end or the central part of the second type of whisker in a plane perpendicular to the major axis of the second type of whisker forms an ellipse, the ratio of the major axis to the minor axis of the ellipse is greater than 1 and less than or equal to 3, for example, 1.2, 1.5, 1.8, 2, 2.2, 2.5, 2.8, etc. The cross-sectional shape formed by the first end of the second type of whisker in any plane perpendicular to the major axis of the second type of whisker is the same as the cross-sectional shape formed by the central part of the second type of whisker in any plane perpendicular to the major axis of the second type of whisker, and the area gradually decreases along the direction away from the central part of the second type of whisker.

[0043] In some embodiments, along the direction of extension of the long axis of the third type of whisker, the change in the diameter of the central part of the third type of whisker is 1 micron or less, and may be, for example, 0 micron, 0.95 micron, 0.8 micron, 0.78 micron, 0.75 micron, 0.72 micron, 0.7 micron, 0.68 micron, 0.65 micron, 0.62 micron, 0.6 micron, 0.58 micron, 0.55 micron, 0.52 micron, 0.5 micron, 0.48 micron, 0.45 micron, 0.42 micron, 0.4 micron, 0.38 micron, 0.35 micron, 0.32 micron, 0.3 micron, 0.28 micron, 0.25 micron, 0.22 micron, 0.2 micron, 0.18 micron, 0.15 micron, 0.12 micron, 0.1 micron, 0.08 micron, 0.05 micron, 0.02 micron, etc. Along the direction away from the center of the third type of whisker, the diameter of the first end of the third type of whisker gradually decreases, and the diameter of the second end of the third type of whisker gradually decreases. In some embodiments, the diameter of the center of the third type of whisker is uniform along the direction of extension of the long axis of the third type of whisker, and the diameters of the first end and the second end of the third type of whisker gradually change.

[0044] In some embodiments, the third type of whisker may be needle-shaped with a reduced diameter at both ends.

[0045] In some embodiments, the orthographic projection of the third type of whisker in a plane perpendicular to the major axis of the third type of whisker may be circular or elliptical, and if the orthographic projection of the central portion of the third type of whisker in a plane perpendicular to the major axis of the third type of whisker forms an ellipse, the ratio of the major axis to the minor axis of the ellipse is greater than 1 and less than or equal to 3, for example, 1.2, 1.5, 1.8, 2, 2.2, 2.5, 2.8, etc. The cross-sectional shape formed by the first end and the second end of the third type of whisker in any plane perpendicular to the major axis of the third type of whisker coincides with the cross-sectional shape formed by the central portion of the third type of whisker in any plane perpendicular to the major axis of the third type of whisker, and the area gradually decreases along the direction away from the central portion of the third type of whisker.

[0046] In some embodiments, the first end of the fourth type of whisker is sequentially connected to the second end of the fourth type of whisker, and the diameter of the fourth type of whisker gradually decreases along the direction from the first end to the second end of the fourth type of whisker.

[0047] In some embodiments, the fourth type of whisker may be elongated cone-shaped.

[0048] The cross-section of the fourth type of whisker in a plane perpendicular to its major axis is circular or elliptical. Along the direction from the first end of the fourth type of whisker toward the second end, the cross-sectional shape of the fourth type of whisker in a plane perpendicular to its major axis is consistent and the area gradually decreases. If the cross-section of the fourth type of whisker in a plane perpendicular to its major axis is elliptical, the diameter of the fourth type of whisker is the length of the major axis of the ellipse, and the ratio of the major axis to the minor axis of the ellipse is greater than 1 and less than or equal to 3, for example, 1.2, 1.5, 1.8, 2, 2.2, 2.5, 2.8, etc.

[0049] In some embodiments, the first end of the fifth type of whisker is sequentially connected to the second end of the fifth type of whisker, and the diameter of the first end of the fifth type of whisker gradually decreases along the direction away from the second end of the fifth type of whisker, and the diameter of the second end of the fifth type of whisker gradually decreases along the direction away from the first end of the fifth type of whisker.

[0050] In some embodiments, the fifth type of whisker may be biconical.

[0051] The cross-section of the fifth type of whisker in a plane perpendicular to its major axis is circular or elliptical. Along the direction away from the second end of the fifth type of whisker, the cross-sectional shape of the first end of the fifth type of whisker in a plane perpendicular to its major axis is the same and the area gradually decreases. Along the direction away from the first end of the fifth type of whisker, the cross-sectional shape of the second end of the fifth type of whisker in a plane perpendicular to its major axis is the same and the area gradually decreases. If the cross-section of the fifth type of whisker in a plane perpendicular to the major axis of the fifth type of whisker is elliptical, then the diameter of the fifth type of whisker is the length of the major axis of the ellipse, and the ratio of the major axis to the minor axis of the ellipse is greater than 1 and less than or equal to 3, for example, 1.2, 1.5, 1.8, 2, 2.2, 2.5, 2.8, etc.

[0052] In some embodiments, if the whisker is at least one selected from the group consisting of the first type of whisker, the second type of whisker, the third type of whisker, the fourth type of whisker, and the fifth type of whisker, it is preferable that the whisker is the third type of whisker, which is advantageous because the second polymer is uniformly bonded to and encapsulated on the surface of the whisker, thereby better improving the dispersibility of the polymer-modified whisker in the first polymer. This further reduces the actual amount of polymer-modified whisker used, improves the chromaticity viewing angle of the display device, and reduces the loss of emitted light from the display device.

[0053] In some embodiments, the whiskers are at least two selected from the group consisting of the first type of whisker, the second type of whisker, the third type of whisker, the fourth type of whisker, and the fifth type of whisker. Preferably, the whiskers are a mixture of the first type of whisker, the second type of whisker, and the third type of whisker, or a mixture of the first type of whisker, the fourth type of whisker, and the fifth type of whisker, or a mixture of the first type of whisker, the second type of whisker, the third type of whisker, the fourth type of whisker, and the fifth type of whisker. By selecting the whiskers from at least two particles with different shapes, the diversity of the whisker shapes is increased, the optical anisotropy of the whiskers is increased, and the contrast and brightness enhancement effect of the whiskers is improved.

[0054] In some embodiments, the whisker is selected from the group consisting of the first type of whisker, the second type of whisker, and the third type of whisker, or the whisker is selected from the group consisting of the first type of whisker, the fourth type of whisker, and the fifth type of whisker, or the whisker is a mixture of the first type of whisker, the second type of whisker, the third type of pre-whisker, the fourth type of whisker, and the fifth type of whisker, in which case the mass fraction of the first type of whisker in the whisker is 1% to 8%, for example The mass fractions of the second type of whisker and / or the fourth type of whisker in the whisker are 40% to 50%, for example, 41%, 42%, 43%, 44%, 45%, 46%, 47%, 48%, 49%, etc. The mass fractions of the third type of whisker and / or the fifth type of whisker in the whisker are 45% to 55%, for example, 46%, 47%, 48%, 49%, etc. Mixing the second type of whisker, the second type of whisker and / or the fourth type of whisker, and the third type of whisker and / or the fifth type of whisker in the above proportions further helps to improve the contrast and brightness enhancement effect of the resulting polymer-modified whisker.

[0055] In some embodiments, the mass fraction of the polymer-modified whiskers in the first resin composition is 1% to 26%, and may be, for example, 1.5%, 2%, 2.5%, 3%, 3.5%, 4%, 4.5%, 5%, 8%, 10%, 13%, 15%, 18%, 20%, 23%, 25%, etc. This helps to achieve significant light diffusion without affecting the light transmittance of the resin composition.

[0056] In some embodiments, along the direction of the major axis of the whisker, the length of the major axis of the whisker is the distance between the two endpoints of the major axis of the whisker. The length of the major axis of the whisker is 10 microns or more, and 30 microns or less, for example, 12 microns, 15 microns, 18 microns, 20 microns, 22 microns, 25 microns, 28 microns, 30 microns, etc. When the length of the major axis of the whisker is within the above range, the major axis of the whisker is more easily oriented, and thereby the polymer-modified whisker is more easily oriented.

[0057] In some embodiments, the minimum diameter of the whisker is 0.5 microns or more, and the maximum diameter of the whisker is 2 microns or less, for example, 0.6 microns, 0.7 microns, 0.8 microns, 0.9 microns, 1 micron, 1.2 microns, 1.5 microns, 1.8 microns, 2 microns, etc. This facilitates obtaining an aspect ratio that further changes the direction of light propagation through the long axis surface of the polymer-modified whisker.

[0058] In some embodiments, the whiskers are selected from at least one of silicon dioxide, silicon carbide, silicon nitride, zinc oxide, magnesium oxide, aluminum oxide, calcium sulfate, calcium carbonate, potassium titanate, and aluminum borate.

[0059] In some embodiments, the surface of the whisker is modified with at least one of an inorganic cation, an inorganic anion, a coupling agent, or a surfactant. That is, at least one of an inorganic cationic group, an inorganic anionic group, a coupling agent group, or a surfactant group is bonded to the surface of the whisker.

[0060] In some embodiments, the surface of the whisker is modified with at least one of the following: inorganic magnesium salts, inorganic calcium salts, inorganic barium salts, inorganic strontium salts, stearic acid, stearates, sulfonic acid surfactants, thio surfactants, titanates, aluminum esters, silanes, alkyl phosphates, aryl phosphates, alkyl phosphates, aryl phosphates, alkyl alcohol amide phosphates, alkyl alcohol amide phosphates, imidazoline phosphates, imidazoline phosphates, polymer phosphates, polymer phosphates, and siloxane phosphates. Specifically, the surface of the whisker is modified with at least one of the following: magnesium chloride, calcium chloride, barium chloride, strontium chloride, stearic acid, sodium stearate, zinc stearate, sulfonic acid surfactants, thio surfactants, titanates, aluminates, silanes, alkyl phosphates, aryl phosphates, alkyl phosphates, aryl phosphates, alkyl alcohol amide phosphates, alkyl alcohol amide phosphates, imidazoline phosphates, imidazoline phosphates, polymer phosphates, polymer phosphates, and siloxane phosphates. Preferably, the surface of the whisker is modified with at least one of the sulfonic acid surfactants or thio surfactants. The sulfonic acid surfactant can be selected from at least one of alkyl sulfonates and fluoroalkyl sulfonates, and specifically, at least one can be selected from sodium dodecylsulfonate, sodium dodecylbenzenesulfonate, and sodium fluorododecylsulfonate. Thio surfactants can be selected from at least one of thiols and fluoromercaptans, specifically from at least one of octyl mercaptan, dodecyl mercaptan, tetradecyl mercaptan, octadecyl mercaptan, fluorooctyl mercaptan, and fluorododecyl mercaptan.When sulfonic acid surfactants are mixed with surface-modified whiskers, the sulfonic acid surfactants form a sulfonic acid group shell layer, such as a benzene ring sulfonic acid group shell layer, on the surface of the whiskers. This protects the whiskers, increases their toughness, and helps reduce the destruction of the polymer-modified whiskers formed by the whiskers in the first resin composition. When thio surfactants are mixed with surface-modified whiskers, the thio surfactants and the hydroxyl groups on the surface of the whiskers form an OSO crosslinking network. Because the bond energy of OSO is relatively large, the surface of the whiskers further bonds with the second polymer, protecting the whiskers in the process of mixing them with the first polymer to form the resin composition. This suppresses the destruction of the polymer-modified whiskers and is advantageous in enhancing the optical function improvement effect, such as contrast and brightness, provided by the polymer-modified whiskers. More preferably, the surface of the whisker is modified with at least one of a sulfonic acid surfactant containing a fluorine substituent and a thio surfactant containing a fluorine substituent, specifically, for example, at least one of sodium fluorododecylsulfonate, fluorooctyl mercaptan, and fluorododecyl mercaptan. The fluorine atom has high stability in the alkyl chain, the bond energy of the carbon-fluorine bond is higher than the bond energy of the carbon-carbon bond, and the carbon-fluorine bond has a shielding effect on the carbon-carbon bond, which is advantageous for protecting the carbon-carbon bond and thereby improves the stability of the whisker. Furthermore, by modifying the surface of the whisker with at least one of an inorganic cation, inorganic anion, coupling agent, or surfactant, the richness of the surface groups of the whisker is increased, the number of bonding sites for the second polymer is increased, and the diversity of polymer materials suitable for use as the second polymer is improved.

[0061] In some embodiments, the second polymer comprises at least one of a polyacrylate group, an acrylate-acrylic acid copolymer group, a polycarboxylic acid water-soluble comb-like copolymer group, and a polydimethylsiloxane group. Specifically, in some embodiments, the second polymer is selected from at least one of a polyacrylic acid ester, an acrylic acid ester-acrylic acid copolymer, a polycarboxylic acid-type water-soluble comb-like copolymer, and a polydimethylsiloxane.

[0062] In some embodiments, the polyacrylate group may be selected from at least one of polymethyl methacrylate, polyglycidyl methacrylate, poly2-hydroxyethyl methacrylate, polymethyl methacrylate, polyethyl acrylate, polybutyl acrylate, and poly2-ethylhexyl acrylate.

[0063] In some embodiments, the polycarboxylic acid-type water-soluble comb-like copolymer may be a graft polymer formed using polyoxyethylene methyl allyl diether, maleic anhydride, styrene, or the like as copolymer monomers. The polycarboxylic acid-type water-soluble comb-like copolymer group may include polyoxyethylene methyl allyl diether group, polymaleic anhydride group, polystyrene group, and the like.

[0064] In some embodiments, the molecular weight of the monomer forming the second polymer is 50 or more, and the molecular weight of the monomer forming the second polymer is 500 or less.

[0065] In some embodiments, the second polymer contains the same groups as the first polymer, or the surface of the polymer-modified whisker contains the same groups as homologs of the first polymer groups. Specifically, in some embodiments, the second polymer is the same as the first polymer, or the second polymer is a homolog of the first polymer. Including the same groups as the first polymer, or homologs of the first polymer, on the surface of the polymer-modified whisker is advantageous in further improving the dispersibility of the whisker in the resin composition. This reduces the actual amount of polymer-modified whisker used, improves the chromaticity viewing angle of the display device, and reduces the loss of emitted light from the display device.

[0066] The method for forming a polymer-modified whisker by bonding the second polymer to the surface of the whisker may be at least one of physical or chemical methods. Here, the physical method may be at least one of the sol-gel method, the precipitation method, and the plasma treatment. The chemical method may be at least one of the heterogeneous phase amalgamation method, gas phase grafting, radiation grafting, high-temperature grafting, photoinitiated grafting, melt grafting, solution grafting, solid phase grafting, microencapsulation techniques, and chemical vapor deposition. The second polymer bonds to groups on the surface of the whisker via side chain groups, for example, to form chemical bonds or hydrogen bonds, thereby bonding to the surface of the whisker. Since the main chain of the second polymer has a certain length, it at least partially encloses the whisker, and preferably the second polymer completely encloses the whisker. Since the dispersibility of the second polymer in the first polymer is stronger than the dispersibility of the whiskers in the first polymer, the dispersibility of the polymer-modified whiskers is stronger than the dispersibility of the whiskers in the first polymer.

[0067] In some embodiments, the first polymer is selected from at least one of polymethyl methacrylate, polymethyl acrylate, polyethyl acrylate, polybutyl acrylate, poly-2-ethylhexyl acrylate, cellulose triacetate, polyethylene terephthalate, polycarbonate, polymethyl methacrylate, polyethylene naphthalate, and polycycloolefin.

[0068] In some embodiments, the surface of the polymer-modified whisker further contains phosphorus. A polymer-modified whisker is obtained by bonding a second polymer to the surface of the whisker which has phosphorus. Since both the second polymer and the first polymer are lipophilic polymers, the polymer-modified whisker is hydrophobic, making it less likely to absorb moisture and clump during transport. Furthermore, the phosphorus-containing element groups on the surface of the whisker become charged, causing them to repel each other due to the repulsive force, which improves the dispersibility of the polymer-modified whisker in the resin composition. When the resin composition is used in a polarizer, the polymer-modified whisker disperses more uniformly and stably, improving the chromaticity and viewing angle of the display device, while simultaneously improving the product yield of the polarizer and display device.

[0069] In some embodiments, the types and content of elements on the surface of the polymer-modified whisker can be detected and acquired by an energy-dispersive spectrometer (EDS). Specifically, the phosphorus element on the surface of the polymer-modified whisker can be measured by EDS detection, and its content can be analyzed by EDS.

[0070] In some embodiments, the polymer-modified whisker or the type of groups present in the whisker can also be analyzed qualitatively or quantitatively by mass spectrometry (MS).

[0071] In some embodiments, after the surface of the whisker is bonded to the second polymer, the surface is modified with at least one of phosphorus-containing substances, such as phosphate esters, phosphite esters, and polyphosphates, to form a phosphorus-containing salt or complex on the surface of the polymer-modified whisker. The phosphorus-containing salt or complex increases the charge on the surface of the polymer-modified whisker and reduces the possibility of aggregation of the polymer-modified whisker due to the repulsion of like charges, improving the dispersibility of the polymer-modified whisker on the polarizer when the resin composition is applied to the polarizer.

[0072] In some embodiments, the whiskers are bonded to a second polymer and modified with a phosphorus-containing substance, after which the surface of the polymer-modified whiskers contains at least one of phosphate groups, phosphite groups, and polyphosphate groups.

[0073] In some embodiments, the whisker is formed from an inorganic salt or oxide of a first metal, the second polymer is bonded to a portion of the surface of the whisker, and after modification with a phosphorus-containing substance, the inorganic salt of the first metal on a portion of the surface of the whisker is replaced with at least one of the following: a phosphate of the first metal, a phosphite ester complex of the first metal, or a polyphosphate complex of the first metal. Accordingly, the surface of the polymer whisker contains the first metal. Accordingly, the surface of the polymer-modified whisker contains at least one of the following: a phosphate group, a phosphite ester group, or a polyphosphate group.

[0074] In some embodiments, the phosphite ester group can be selected from at least one of alkyl phosphite, aryl phosphite, and arylalkyl phosphite.

[0075] In some embodiments, the alkyl group in the alkyl phosphite ester and aryl alkyl phosphite ester can be selected from at least one alkyl group having 1 to 20 carbon atoms. Furthermore, the alkyl group in the alkyl phosphite ester and aryl alkyl phosphite ester can be selected from at least one alkyl group having 1 to 15 carbon atoms. Furthermore, the alkyl group in the alkyl phosphite ester and aryl alkyl phosphite ester can be selected from at least one alkyl group having 1 to 12 carbon atoms. Furthermore, the alkyl group in the alkyl phosphite ester and aryl alkyl phosphite ester can be selected from at least one alkyl group having 1 to 10 carbon atoms. Furthermore, the alkyl group in the alkyl phosphite ester and aryl alkyl phosphite ester can be selected from at least one alkyl group having 1 to 8 carbon atoms.

[0076] In some embodiments, the aryl group in the arylphosphonate can be selected from at least one aryl group having 6 to 20 carbon atoms. An aryl group refers to an aromatic hydrocarbon group derived by removing one hydrogen atom from an aromatic ring compound, and may be a monocyclic aryl group, a close-cyclic aryl group, or a polycyclic aryl group. In the case of a polycyclic ring, at least one ring is an aromatic ring system. Furthermore, the aryl group in the arylphosphonate can be selected from at least one aryl group having 6 to 18 carbon atoms. Furthermore, the aryl group in the arylphosphonate can be selected from at least one aryl group having 6 to 15 carbon atoms. Furthermore, the aryl group in the arylphosphonate can be selected from at least one aryl group having 6 to 12 carbon atoms. Furthermore, the aryl group in the arylphosphonate can be selected from at least one aryl group having 6 to 10 carbon atoms.

[0077] In some embodiments, at least one hydrogen atom of the alkyl and / or aryl group in the alkyl phosphite, aryl phosphite, or aryl alkyl phosphite may be substituted with a fluorine atom.

[0078] In some embodiments, the phosphite ester group can be selected from at least one of trityl phosphate and diphenyl monooctyl phosphate.

[0079] In some embodiments, the surface of the polymer-modified whisker contains at least one of the following: a phosphate of the first metal, a phosphite ester complex of the first metal, or a polyphosphate complex of the first metal. That is, if the surface of the polymer-modified whisker has phosphate groups, at least some of the phosphate groups are present as a phosphate of the first metal; if the surface of the polymer-modified whisker has phosphite ester groups, at least some of the phosphite ester groups are present as a phosphite ester complex of the first metal; and if the surface of the polymer-modified whisker has polyphosphate groups, at least some of the polyphosphate groups are present as a polyphosphate complex of the first metal.

[0080] In some embodiments, the first metal is selected from at least one of calcium, barium, titanium, and aluminum.

[0081] In some embodiments, the whisker material is selected from at least one of calcium carbonate, barium sulfate, titanium oxide, and aluminum oxide.

[0082] In some embodiments, the surface of the polymer-modified whisker contains at least one of the following: calcium phosphate, barium phosphite complex, barium polyphosphate complex, titanium phosphite complex, titanium polyphosphate complex, aluminum phosphite complex, and aluminum polyphosphate complex.

[0083] In some embodiments, the mass fraction of phosphorus in the polymer-modified whisker is less than 7%. Specifically, the mass fraction of phosphorus in the polymer-modified whisker is greater than 0% and less than 7%, and may be, for example, 0.1%, 0.2%, 0.3%, 0.4%, 0.5%, 0.6%, 0.8%, 1%, 1.2%, 1.5%, 1.6%, 1.8%, 2%, 2.2%, 2.4%, 2.5%, 2.6%, 2.8%, 3%, 3.2%, 3.5%, 3.6%, 3.8%, 4%, 4.2%, 4.4%, 4.5%, 4.6%, 4.8%, 5%, 5.2%, 5.5%, 5.6%, 5.8%, 6%, 6.2%, 6.5%, 6.6%, 6.8%, etc. Preferably, in the polymer-modified whisker, the mass fraction of phosphorus is greater than 0% and 4% or less.

[0084] In some embodiments, the ratio of the length of the major axis of the polymer-modified whisker to the diameter of the polymer-modified whisker is 1 or more, and the ratio of the length of the major axis of the polymer-modified whisker to the diameter of the polymer-modified whisker is 50 or less, for example, 1.1, 1.2, 1.3, 1.5, 1.6, 1.8, 2, 2.2, 2.5, 2.8, 3, 3.5, 3.6, 3.8, 4, 4.2, 4.5, 4.8, 5, 6, 7, 8, 10, 12, 15, 16, 18, 20, 30, 32, 34, 35, 36, 38, 40, 42, 45, 46, 48, etc. Each polymer-modified whisker has a major axis and a diameter, the length of the major axis of the polymer-modified whisker being the distance between the two endpoints of the major axis of the polymer-modified whisker, each polymer-modified whisker having multiple cross-sections in an extending direction perpendicular to the major axis of the polymer-modified whisker, each cross-section having one largest inscribed circle, and the diameter of the polymer-modified whisker corresponding to the diameter of the largest inscribed circle among the multiple cross-sections. Preferably, the ratio of the length of the major axis of the polymer-modified whisker to the diameter of the polymer-modified whisker is 1 or more, and the ratio of the length of the major axis of the polymer-modified whisker to the diameter of the polymer-modified whisker is 15 or less.

[0085] In some embodiments, the first polymer is selected from crystalline polymers. That is, the first polymer crystallizes during the process of processing the resin composition to form a resin layer. For example, when the first polymer is selected from a material such as polyethylene terephthalate, it is preferable that the ratio of the length of the major axis of the polymer-modified whisker to the diameter of the polymer-modified whisker is 1 or more, and the ratio of the length of the major axis of the polymer-modified whisker to the diameter of the polymer-modified whisker is 5 or less. When the first polymer is selected from crystalline polymers, a crystal is formed with the polymer-modified whisker as a core, and the ratio of the length of the major axis of the polymer-modified whisker to the diameter is controlled to be 1 or more and 5 or less, thereby controlling the ratio of the length of the major axis to the diameter of the crystal formed with the polymer-modified whisker as a core to be within an appropriate range, and improving the chromaticity viewing angle improvement effect of the polymer-modified whisker. Furthermore, when the resin composition uses a material such as polyethylene terephthalate (PET) as the first polymer, the addition of the polymer-modified whiskers can improve or eliminate the rainbow pattern phenomenon that occurs because the resin layer formed on the polarizer has birefringence. The improvement effect of the polymer-modified whiskers is better when the ratio of the length of the major axis to the diameter is 1 or more and 5 or less. At the same time, in the process of applying the resin layer on which the resin composition is formed to a polarizer, it is necessary to filter the resin composition using a filter core with a certain pore size to remove impurities. When the ratio of the length of the major axis to the diameter of the polymer-modified whiskers is 1 or more and 5 or less, it matches the pore size of the filter core used when the first polymer is selected from crystalline polymers, the polymer-modified whiskers pass through the filter core, reducing the replacement of the filter core during the production process, which is advantageous in improving the production efficiency and product yield of polarizers.

[0086] In some embodiments, the first polymer is selected from amorphous polymers. That is, the first polymer does not crystallize during the process of processing the resin composition to form a resin layer. For example, when the first polymer is selected from materials such as polymethyl methacrylate (PMMA) or acrylate polymers, it is preferable that the ratio of the length of the major axis of the polymer-modified whisker to the diameter of the polymer-modified whisker is 1 or more, and the ratio of the length of the major axis of the polymer-modified whisker to the diameter of the polymer-modified whisker is 15 or less. For example, the ratio of the length of the major axis of the polymer-modified whisker to the diameter of the polymer-modified whisker may be 10. In the process of applying the resin composition to a polarizer by forming a resin layer, it is necessary to filter the resin composition using a filter core with a certain pore size to remove impurities. When the ratio of the length of the major axis of the polymer-modified whisker to its diameter is 5 or more and 15 or less, it matches the pore size of the filter core used when the first polymer is selected from amorphous polymers. This allows the polymer-modified whisker to pass through the filter core, reducing the need to replace the filter core during the production process and improving the production efficiency and product yield of the polarizer.

[0087] In some embodiments, the length of the long axis of the polymer-modified whisker is 30 microns or less, and may be, for example, 2 microns, 5 microns, 8 microns, 10 microns, 15 microns, 20 microns, 25 microns, 28 microns, etc. Furthermore, the length of the long axis of the polymer-modified whisker is 1 micron or more.

[0088] In some embodiments, the polymer-modified whisker is at least one selected from the group consisting of a first type of whisker, a second type of whisker, a third type of whisker, a fourth type of whisker, and a fifth type of whisker. The first type of whisker, the second type of whisker, the third type of whisker, the fourth type of whisker, and the fifth type of whisker each have different shapes.

[0089] In some embodiments, the change in diameter of the polymer-modified whisker along the direction of extension of its long axis represents the magnitude of the change in diameter of the polymer-modified whisker. Along the direction of extension of its long axis, the polymer-modified whisker has a first end and a second end. The first end of the polymer-modified whisker is sequentially connected to the second end of the polymer-modified whisker, or the polymer-modified whisker has a central portion connecting the first end and the second end, where the central portion of the polymer-modified whisker is the portion having a uniform diameter, i.e., the portion where the change in diameter of the central portion of the polymer-modified whisker along the direction of extension of its long axis is 1 micron or less. The first end and the second end of the polymer-modified whisker are portions where the diameter of the polymer-modified whisker can change more.

[0090] In some embodiments, along the direction of extension of the long axis of the first type of whisker, the change in diameter of the first type of whisker is 0.3 microns or less, and may be, for example, 0 microns, 0.28 microns, 0.25 microns, 0.22 microns, 0.2 microns, 0.18 microns, 0.15 microns, 0.12 microns, 0.1 microns, 0.08 microns, 0.05 microns, 0.02 microns, etc. In some embodiments, along the direction of extension of the long axis of the first type of whisker, the diameter of the first end of the first type of whisker is the same as the diameter of the central part of the first type of whisker, and the diameter of the second end of the first type of whisker is the same as the diameter of the central part of the first type of whisker.

[0091] In some embodiments, the first type of whisker may be rod-shaped, and if the first type of whisker is rod-shaped, the cross-section of the first type of whisker in a plane perpendicular to the major axis of the first type of whisker is circular or elliptical. If the orthographic projection of the first type of whisker in a plane perpendicular to the major axis of the first type of whisker is elliptical, the diameter of the first type of whisker is the length of the minor axis of the ellipse, and the ratio of the major axis to the minor axis of the ellipse is greater than 1 and less than or equal to 3, for example, 1.2, 1.5, 1.8, 2, 2.2, 2.5, 2.8, etc.

[0092] In some embodiments, the cross-section of the first type of whisker in a plane perpendicular to the long axis of the first type of whisker is triangular, quadrilateral, pentagonal, or other polygonal in shape.

[0093] In some embodiments, the first type of whisker may be rectangular or square in shape, and if the first type of whisker is square or rectangular, the cross-section of the first type of whisker in a plane perpendicular to the major axis of the first type of whisker is square or rectangular, and the diameter of the first type of whisker is the length of one side of the square or the length of the shorter side of the rectangle.

[0094] In some embodiments, along the direction of extension of the long axis of the second type of whisker, the change in the diameter of the central part of the second type of whisker is 1 micron or less, and along the direction away from the central part of the second type of whisker, the diameter of the first end of the second type of whisker gradually decreases, and the change in the diameter of the second end of the second type of whisker is 1 micron or less, for example, 0 micron, 0.95 micron, 0.8 micron, 0.78 micron, 0.75 micron, 0.72 micron, 0.7 micron, The micron diameters may be 0.68 microns, 0.65 microns, 0.62 microns, 0.6 microns, 0.58 microns, 0.55 microns, 0.52 microns, 0.5 microns, 0.48 microns, 0.45 microns, 0.42 microns, 0.4 microns, 0.38 microns, 0.35 microns, 0.32 microns, 0.3 microns, 0.28 microns, 0.25 microns, 0.22 microns, 0.2 microns, 0.18 microns, 0.15 microns, 0.12 microns, 0.1 microns, 0.08 microns, 0.05 microns, 0.02 microns, etc. Along the direction away from the center of the second type of whisker, the diameter of the first end of the second type of whisker gradually decreases, and the change in the diameter of the second end of the second type of whisker is 1 micron or less, for example, 0 micron, 0.95 micron, 0.8 micron, 0.78 micron, 0.75 micron, 0.72 micron, 0.7 micron, 0.68 micron, 0.65 micron, 0.62 micron, 0.6 micron, 0.58 micron Micron, 0.55 micron, 0.52 micron, 0.5 micron, 0.48 micron, 0.45 micron, 0.42 micron, 0.4 micron, 0.38 micron, 0.35 micron, 0.32 micron, 0.3 micron, 0.28 micron, 0.25 micron, 0.22 micron, 0.2 micron, 0.18 micron, 0.15 micron, 0.12 micron, 0.1 micron, 0.08 micron, 0.05 micron, 0.02 micron, etc. are also acceptable.In some embodiments, along the direction away from the central portion of the second type of whisker, the diameter of the first end of the second type of whisker gradually decreases, and the diameter of the second end of the second type of whisker is the same as the diameter of the central portion of the second type of whisker.

[0095] In some embodiments, the second type of whisker may be needle-shaped with a smaller diameter at one end.

[0096] In some embodiments, the orthographic projection of the second type of whisker in a plane perpendicular to the major axis of the second type of whisker may be circular or elliptical, and if the orthographic projection of the second end or the central part of the second type of whisker in a plane perpendicular to the major axis of the second type of whisker is circular or elliptical, the ratio of the major axis to the minor axis of the ellipse is greater than 1 and less than or equal to 3, for example, 1.2, 1.5, 1.8, 2, 2.2, 2.5, 2.8, etc. The cross-sectional shape formed by the first end of the second type of whisker in any plane perpendicular to the major axis of the second type of whisker coincides with the cross-sectional shape formed by the central part of the second type of whisker in any plane perpendicular to the major axis of the second type of whisker, and the area gradually decreases along the direction away from the central part of the second type of whisker.

[0097] In some embodiments, along the direction of extension of the long axis of the third type of whisker, the change in the diameter of the central part of the third type of whisker is 1 micron or less, and may be, for example, 0 micron, 0.95 micron, 0.8 micron, 0.78 micron, 0.75 micron, 0.72 micron, 0.7 micron, 0.68 micron, 0.65 micron, 0.62 micron, 0.6 micron, 0.58 micron, 0.55 micron, 0.52 micron, 0.5 micron, 0.48 micron, 0.45 micron, 0.42 micron, 0.4 micron, 0.38 micron, 0.35 micron, 0.32 micron, 0.3 micron, 0.28 micron, 0.25 micron, 0.22 micron, 0.2 micron, 0.18 micron, 0.15 micron, 0.12 micron, 0.1 micron, 0.08 micron, 0.05 micron, 0.02 micron, etc. Along the direction away from the center of the third type of whisker, the diameter of the first end of the third type of whisker gradually decreases, and the diameter of the second end of the third type of whisker gradually decreases. In some embodiments, the diameter of the center of the third type of whisker is uniform along the direction of extension of the long axis of the third type of whisker, and the diameters of the first end and the second end of the third type of whisker gradually change.

[0098] In some embodiments, the third type of whisker may be needle-shaped with a reduced diameter at both ends.

[0099] In some embodiments, the orthographic projection of the third type of whisker in a plane perpendicular to the major axis of the third type of whisker may be circular or elliptical, and if the orthographic projection of the central portion of the third type of whisker in a plane perpendicular to the major axis of the third type of whisker forms an ellipse, the ratio of the major axis to the minor axis of the ellipse is greater than 1 and less than or equal to 3, for example, 1.2, 1.5, 1.8, 2, 2.2, 2.5, 2.8, etc. The cross-sectional shape formed by the first end and the second end of the third type of whisker in any plane perpendicular to the major axis of the third type of whisker coincides with the cross-sectional shape formed by the central portion of the third type of whisker in any plane perpendicular to the major axis of the third type of whisker, and the area gradually decreases along the direction away from the central portion of the third type of whisker.

[0100] In some embodiments, the first end of the fourth type of whisker is sequentially connected to the second end of the fourth type of whisker, and the diameter of the fourth type of whisker gradually decreases along the direction from the first end to the second end of the fourth type of whisker.

[0101] In some embodiments, the fourth type of whisker may be elongated cone-shaped.

[0102] The cross-section of the fourth type of whisker in a plane perpendicular to its major axis is circular or elliptical. Along the direction from the first end of the fourth type of whisker toward the second end, the cross-sectional shape of the fourth type of whisker in a plane perpendicular to its major axis is consistent and the area gradually decreases. If the cross-section of the fourth type of whisker in a plane perpendicular to its major axis is elliptical, the diameter of the fourth type of whisker is the length of the minor axis of the ellipse, and the ratio of the major axis to the minor axis of the ellipse is greater than 1 and less than or equal to 3, for example, 1.2, 1.5, 1.8, 2, 2.2, 2.5, 2.8, etc.

[0103] In some embodiments, the first end of the fifth type of whisker is sequentially connected to the second end of the fifth type of whisker, and the diameter of the first end of the fifth type of whisker gradually decreases along the direction away from the second end of the fifth type of whisker, and the diameter of the second end of the fifth type of whisker gradually decreases along the direction away from the first end of the fifth type of whisker.

[0104] In some embodiments, the fifth type of whisker may be biconical.

[0105] In some embodiments, the fifth type of whisker may be spherical or ellipsoidal.

[0106] The cross-section of the fifth type of whisker in a plane perpendicular to its major axis is circular or elliptical. Along the direction away from the second end of the fifth type of whisker, the cross-sectional shape of the first end of the fifth type of whisker in a plane perpendicular to its major axis is the same and the area gradually decreases. Along the direction away from the first end of the fifth type of whisker, the cross-sectional shape of the second end of the fifth type of whisker in a plane perpendicular to its major axis is the same and the area gradually decreases. If the cross-section of the fifth type of whisker in a plane perpendicular to the major axis of the fifth type of whisker is elliptical, then the diameter of the fifth type of whisker is the length of the minor axis of the ellipse, and the ratio of the major axis to the minor axis of the ellipse is greater than 1 and less than or equal to 3, for example, 1.2, 1.5, 1.8, 2, 2.2, 2.5, 2.8, etc.

[0107] In some embodiments, the polymer-modified whiskers are at least two selected from the group consisting of the first type of whisker, the second type of whisker, the third type of whisker, the fourth type of whisker, and the fifth type of whisker. Preferably, the polymer-modified whiskers are a mixture of the first type of whisker, the second type of whisker and / or the fourth type of whisker, the third type of whisker and / or the fifth type of whisker. By selecting the polymer-modified whiskers from at least two particles with different shapes, the diversity of shapes of the polymer-modified whiskers is increased, the optical anisotropy of the whiskers is increased, and the contrast and brightness enhancement effect of the whiskers is improved.

[0108] In some embodiments, the polymer-modified whisker is a mixture of the first type of whisker, the second type of whisker and / or the fourth type of whisker, the third type of whisker and / or the fifth type of whisker, and the mass fraction of the first type of whisker in the polymer-modified whisker is 1% to 8%, and may be, for example, 1.5%, 2%, 2.5%, 3%, 3.5%, 4%, 4.5%, 5%, 6%, 6.5%, 7%, 7.5%, etc. The mass fraction of the second type of whisker and / or the fourth type of whisker in the polymer-modified whisker is 40% to 50%, for example, 41%, 42%, 43%, 44%, 45%, 46%, 47%, 48%, 49%, etc., and the mass fraction of the third type of whisker and / or the fifth type of whisker in the whisker is 45% to 55%, for example, 46%, 47%, 48%, 49%, 50%, 51%, 52%, 53%, 54%, etc. Mixing the first type of whisker, the second type of whisker and / or the fourth type of whisker, and the third type of whisker and / or the fifth type of whisker in the above proportions further helps to improve the contrast and brightness enhancement effect of the resulting polymer-modified whisker.

[0109] In some embodiments, the mass fraction of the polymer-modified whiskers in the resin composition is 0.03% or more, and the mass fraction of the polymer-modified whiskers is 10% or less, for example, 0.04%, 0.05%, 0.1%, 0.2%, 0.3%, 0.5%, 0.6%, 1%, 1.5%, 2%, 3%, 4%, 5%, 6%, 7%, 8%, or 9%, which helps to achieve clear light diffusion without affecting the light transmittance of the resin composition.

[0110] In some embodiments, when the first polymer is selected from crystalline polymers, the mass fraction of the polymer-modified whiskers is 0.05% or more and 5% or less. Since the resin composition forms crystals with the polymer-modified whiskers as cores when forming the resin layer, if the mass fraction of the polymer-modified whiskers is within the above range, optical properties such as the chromaticity and viewing angle of the polarizer can be improved. Preferably, when the first polymer is selected from crystalline polymers, the mass fraction of the polymer-modified whiskers is 0.05% or more and 2% or less, which helps to improve the chromaticity and viewing angle of the polarizer due to the polymer-modified whiskers and suppress the decrease in light transmittance.

[0111] In some embodiments, the refractive index of the polymer-modified whisker is greater than that of the first polymer.

[0112] In some embodiments, the difference between the refractive index of the polymer-modified whisker and the refractive index of the first polymer is 0.02 or greater, for example, 0.03, 0.05, 0.09, 0.1, 0.15, 0.2, etc., in order to exhibit a light-diffusing function. This further improves the optical properties of the polarizer when the resin composition is applied to the polarizer.

[0113] In embodiments of the present invention, a second polymer is bonded to the surface of a whisker to obtain a polymer-modified whisker. Since the first polymer and the second polymer are both lipophilic polymers, the dispersibility of the polymer-modified whisker in the resin composition is improved. When the resin composition is used in a polarizer, the actual amount of polymer-modified whisker used is reduced. Furthermore, the chromaticity and viewing angle of the display device are improved, and the loss of emitted light from the display device is reduced.

[0114] Referring to Figures 1 to 5, embodiments of the present invention also provide polarizers containing the above-mentioned resin composition.

[0115] Embodiments of the present invention utilize a resin layer, a resin composition contained in the resin layer for bonding the whisker surface to a second polymer to obtain the polymer-modified whisker, and a dispersion of the polymer-modified whisker in the resin composition. This improves performance, reduces the actual amount of polymer-modified whisker used, improves the chromaticity viewing angle of a polarizer-based display device, and reduces the loss of emitted light from the display device.

[0116] In some embodiments, the resin layer is composed of the above-described resin composition.

[0117] In some embodiments, the polarizer further includes a polarizing layer, the resin layer is located on one side of the polarizing layer, or the resin layer is the polarizing layer.

[0118] In some embodiments, the orthographic projection of the major axis of the polymer-modified whisker of the resin layer in a first plane has a first orientation angle, the orthographic projection of the absorption axis of the polarizing layer in the first plane has a second orientation angle, the average difference between the first orientation angle and the second orientation angle is -15° or more, the average difference between the first orientation angle and the second orientation angle is 15° or less, the first plane is parallel to the plane on which the polarizing layer is located, and the major axis of the polymer-modified whisker is parallel to the major axis of the whisker axis or overlaps with the major axis of the whisker axis. The average difference between the first orientation angle and the second orientation angle is -0.15°, -1°, -1.3°, -1.15°, -1.8°, -2°, -2.3°, -2.15°, -2.8°, -3°, -3.3°, -3.15°, -3.8°, -4°, -4.3°, -4.15°, -4.8°, -5°, -5.5°, -6 The angles may also be -6.5°, -7°, -8°, -9°, -10°, -11°, -12°, -13°, -14°, 0°, 0.15°, 1°, 1.3°, 1.15°, 1.8°, 2°, 2.3°, 2.15°, 2.8°, 3°, 3.3°, 3.15°, 3.8°, 4°, 4.3°, 4.15°, 4.8°, 5°, 5.5°, 6°, 6.5°, 7°, 8°, 9°, 10°, 11°, 12°, 13°, 14°, etc. By setting the absolute value of the angular difference between the orthographic projection of the long axis of the polymer-modified whisker onto the first surface and the orthographic projection of the absorption axis of the polarizing layer onto the first surface to 15° or less, more light has its propagation direction changed by the polymer-modified whisker, and the effect of improving chromaticity, viewing angle, and contrast is enhanced.

[0119] In some embodiments, there is an angle between the long axis of the polymer-modified whisker and the first plane, the angle being acute and 40° or less, for example, 2°, 5°, 8°, 10°, 12°, 15°, 18°, 20°, 22°, 25°, 28°, 30°, 32°, 35°, 38°, or 40°. The long axis of the polymer-modified whisker is spatially at an angle with respect to the first plane, which allows more light to have its propagation direction further altered by the polymer-modified whisker, thereby enhancing the effect of improving chromaticity, viewing angle, and contrast.

[0120] In some embodiments, the orthographic projection of the major axis of the polymer-modified whisker onto the second plane has a third orientation angle, the orthographic projection of the absorption axis of the polarizing layer onto the second plane has a fourth orientation angle, the average difference between the third and fourth orientation angles is -15° or more, the average difference between the third and fourth orientation angles is 15° or less, the second plane is perpendicular to the plane on which the polarizing layer is located, the second plane is not perpendicular to the absorption axis of the polarizing layer, and the second plane is not perpendicular to the polymer modification. By making the absolute value of the average angle between the orthographic projection of the major axis of the polymer-modified whisker onto the second plane and the orthographic projection of the absorption axis of the polarizing layer onto the second plane 15° or less, the major axis of the polymer-modified whisker becomes spatially nearly parallel to the absorption axis of the polarizing layer, so that more light can have its propagation direction further altered by the polymer-modified whisker, thereby increasing the effect of improving chromaticity, viewing angle, and contrast. The average difference between the third orientation angle and the fourth orientation angle is -0.15°, -1°, -1.3°, -1.15°, -1.8°, -2°, -2.3°, -2.15°, -2.8°, -3°, -3.3°, -3.15°, -3.8°, -4°, -4.3°, -4.15°, -4.8°, -5°, -5.5°, -6°, -6.5°, -7°, -8°, -9°, -10°, -11°, -12°, -13°, -14°, 0°, 0.15°, 1°, 1.3°, 1.15°, 1.8°. The degrees may also be °, 2°, 2.3°, 2.15°, 2.8°, 3°, 3.3°, 3.15°, 3.8°, 4°, 4.3°, 4.15°, 4.8°, 5°, 5.5°, 6°, 6.5°, 7°, 8°, 9°, 10°, 11°, 12°, 13°, 14°, etc.

[0121] In some embodiments, the average difference between the first orientation angle and the second orientation angle is -15° or more, and the difference between the first orientation angle and the second orientation angle is 15° or less. That is, when the second orientation angle is 0°, the average difference between the first orientation angle and the second orientation angle is -15° or more, and the difference between the first orientation angle and the second orientation angle is 15° or less. The average difference between the third orientation angle and the fourth orientation angle is -15° or more, and the difference between the third orientation angle and the fourth orientation angle is 15° or less. That is, when the fourth orientation angle is 0°, the average difference between the third orientation angle and the fourth orientation angle is -15° or more, and the difference between the third orientation angle and the fourth orientation angle is 15° or less. The average value of the difference between the first orientation angle and the second orientation angle in the resin layer, and the average value of the difference between the third orientation angle and the fourth orientation angle, are obtained by statistical analysis using an existing program after photographing the resin layer with an optical microscope.

[0122] In some embodiments, the polarizer further includes a first protective layer, and if the resin layer is located on one side of the polarizing layer, the resin layer is located between the first protective layer and the polarizing layer. Alternatively, if the resin layer is located on one side of the polarizing layer, the resin layer is located on the side of the first protective layer away from the polarizing layer.

[0123] In some embodiments, the polarizer further includes a first protective layer and a hard coat layer, and when the resin layer is located on one side of the polarizing layer, the resin layer is located on the side of the first protective layer away from the polarizing layer, and the hard coat layer is located on the side of the resin layer away from the first protective layer. Specifically, the resin layer is an adhesive layer, and the resin layer is bonded between the polarizing layer and the first protective layer, and the hard coat layer is located on the side of the first protective layer away from the polarizing layer.

[0124] In some embodiments, the resin layer is located on one side of the polarizing layer, the polarizer further comprises a first protective layer and a hard coat layer, the first protective layer is located between the polarizing layer and the hard coat layer, and the resin layer is either the first protective layer or the hard coat layer.

[0125] In some embodiments, the resin layer is located on one side of the polarizing layer, and the polarizer further comprises a first protective layer, a second protective layer, and a hard coat layer, wherein the second protective layer is located on the side of the first protective layer away from the polarizing layer, and the hard coat layer is located on the side of the second protective layer away from the polarizing layer. The resin layer is an adhesive layer, and the resin layer is bonded between the first protective layer and the second protective layer, or the resin layer is any of the first protective layer, the second protective layer, and the hard coat layer.

[0126] Specifically, according to some embodiments of the present application, the polarizer 100 includes a first protective layer, a second protective layer, and a polarizing layer, wherein the first and second protective layers are arranged on opposite sides of the resin layer 10. Optionally, the resin layer 10 acts as an adhesive layer to bond the first and second protective layers, and the polarizing layer is arranged on the side of the first protective layer away from the resin layer 10. Optionally, the polarizer 100 further includes an adhesive layer, wherein the first and second protective layers are arranged on opposite sides of the resin layer 10, the adhesive layer bonds the first protective layer to the resin layer 10, and the polarizing layer is arranged on the side of the first protective layer away from the resin layer 10.

[0127] Figure 1 shows an embodiment of the resin layer 10 as an adhesive layer. The polarizer 100 includes sequentially laminated release film 11, a first pressure-sensitive adhesive layer 12, an optical compensation layer 13, a polarizing layer 14, a first protective layer 15, a second pressure-sensitive adhesive layer 16, a second protective layer 17, a hard coat layer 18, an anti-reflective layer 19, and a surface protective layer 20. When the polarizer 100 is in use, the direction from the release film 11 to the surface protective layer 20 is the lamination direction of the film layers in the polarizer 100, and is also the direction of light incidence.

[0128] The function of the release film 11 is to protect the pressure-sensitive adhesive layer from damage and prevent the formation of bonding bubbles before the polarizer 100 is bonded to the liquid crystal display panel. The release film 11 may be, for example, a polyethylene terephthalate film, a polyolefin film such as polyethylene film and polypropylene film, or a polytetrafluoroethylene film. To facilitate peeling, it is also possible to use a siloxane resin, melamine resin, or urea resin that has been treated for release.

[0129] The first pressure-sensitive adhesive (PSA) layer 12 is provided on one side of the release film 11. The first pressure-sensitive adhesive 12 is an adhesive layer used to bond the release film 11 to a film layer such as a polarizing layer 14 placed on the release film 11. An example of the material for the first pressure-sensitive adhesive 12 is acrylic resin.

[0130] The optical compensation layer 13 is positioned on the side of the first pressure-sensitive adhesive 12 that is away from the release film 11. The optical compensation layer 13 may be a compensation layer or a phase difference film in which a liquid crystal compound is applied to the surface of the protective layer, oriented and fixed.

[0131] The polarizing layer 14 is located on the side of the optical compensation layer 13 away from the first pressure-sensitive adhesive 12. The polarizing layer 14 may contain polyvinyl alcohol. Specifically, the polarizing layer 14 may contain an iodine-dyed polyvinyl alcohol film or a polyene compound obtained by dehydrating a polyvinyl alcohol film.

[0132] The first protective layer 15 is positioned on the side of the polarizing layer 14 away from the optical compensation layer 13. The first protective layer 15 is used to protect the polarizing layer 14 and to support the film layer located on the first protective layer 15. The first protective layer 15 is at least one selected from the group consisting of cellulose ester resins including triacetylcellulose (TAC), cyclic polyolefin resins including amorphous cyclic polyolefin (COP), polycarbonate resin, polyester resins including polyethylene terephthalate (PET), polyethersulfone resin, polysulfone resin, polyamide resin, polyimide resin, acyclic polyolefin resin, polyacrylic acid ester resins including poly(methyl methacrylate) resin, polyvinyl alcohol resin, polyvinyl chloride resin, and polyvinylidene chloride resin. Specifically, the material of the first protective layer 15 is PET.

[0133] The second pressure-sensitive adhesive layer 16 is positioned on the side of the first protective layer 15 away from the polarizing layer 14. Similar to the first pressure-sensitive adhesive 12, the second pressure-sensitive adhesive layer 16 is an adhesive layer for bonding the first protective layer 15 and the second protective layer 17. The material of the second pressure-sensitive adhesive layer 16 is the same as that of the first pressure-sensitive adhesive 12, and therefore its description is omitted here.

[0134] In this embodiment, the polymer-modified whisker is placed within the second pressure-sensitive adhesive layer 16, that is, the resin layer 10 is the second pressure-sensitive adhesive layer 16.

[0135] The second protective layer 17 is positioned on the side of the second pressure-sensitive adhesive layer 16 that is away from the first protective layer 15. The second protective layer 17 is used to support the film layer located on top of the second protective layer 17. The material of the second protective layer 17 is the same as that of the first protective layer 15, so a detailed explanation is omitted here. Specifically, the material of the second protective layer 17 is PET.

[0136] The hard coat layer 18 is positioned on the side of the second protective layer 17 away from the second pressure-sensitive adhesive layer 16. The hard coat layer 18 has high hardness, waterproofing and oil resistance, can effectively prevent scratches on the surface of the underlying film layer, and is easy to clean. Optionally, the hard coat layer 18 has a higher glass transition temperature, for example, 70°C to 120°C. The material for the hard coat layer 18 can be selected from polyurethane resin, acrylate resin, epoxy resin, vinyl resin, and silicone resin.

[0137] The anti-reflection layer 19 (AR) is provided on the side of the hard coat layer 18 away from the second protective layer 17. The anti-reflection layer 19 is used to prevent reflection and scratching. The anti-reflection layer 19 is, for example, a dielectric film formed on the surface of the hard coat layer 18.

[0138] The surface protection layer 20 is used to protect the underlying film layer. The surface protection layer 20 may be a transparent resin film formed from thermoplastic resins such as chain polyolefin resins (polypropylene resins, etc.) and cyclic polyolefin resins (norbornene resins, etc.), cellulose ester resins such as cellulose triacetic acid and cellulose diacetic acid, polyester resins such as polyethylene terephthalate, polyethylene naphthalate, and butylene terephthalate, polycarbonate resins, (meth)acrylic resins, or mixtures or copolymers thereof.

[0139] Furthermore, in addition to the film layer described above, the polarizer 100 may have other film layers, such as an antistatic layer, although these are not described herein.

[0140] Figure 2 shows a polarizer 100 bonded between the first protective layer 15 and the resin layer 210 via an adhesive layer. The embodiment in Figure 2 differs from the embodiment in Figure 1 in that the polymer-modified whiskers are not dispersed in the second pressure-sensitive adhesive layer 16, and the resin layer 210 is separately provided on the second pressure-sensitive adhesive layer 16, with the polymer-modified whiskers dispersed in the resin layer 210.

[0141] Examples of materials for the resin layer 210 include polyurethane resin, acrylic resin, epoxy resin, vinyl resin, and silicone resin.

[0142] According to some embodiments of this application, the polarizer 100 includes a first protective layer, a polarizing layer, and a hard coat layer, wherein the first protective layer is disposed between the polarizing layer and the hard coat layer, and the resin layer is one of the first protective layer, the polarizing layer, and the hard coat layer.

[0143] In some embodiments, when the first polymer of the resin composition is selected from crystalline polymers, the resin layer is either the first protective layer or the second protective layer. When the first polymer of the resin composition is selected from amorphous polymers, the resin layer is any of the first protective layer, the second protective layer, the polarizing layer, and the hard coat layer.

[0144] Figure 3 shows a polarizer 100 in which the resin layer 310 is a hard coat layer 318. The embodiment in Figure 3 differs from the embodiment in Figure 2 in that the polymer-modified whiskers are not dispersed in the second pressure-sensitive adhesive layer 16, but are dispersed in the hard coat layer 318. Furthermore, in this embodiment, only one first protective layer 315 is provided, and the second protective layer and the second pressure-sensitive adhesive layer can be omitted. By omitting the second protective layer, the structure of the polarizer 100 can be simplified, and by omitting one protective layer, brightness and contrast are improved.

[0145] Figure 4 shows an embodiment in which the resin layer 410 is the first protective layer 415. The embodiment in Figure 4 differs from the embodiment in Figure 3 in that the polymer-modified whiskers are not dispersed in the hard coat layer 18 but are dispersed in the first protective layer 415. Furthermore, in this embodiment, only one first protective layer 415 may be provided. In this structure, the first protective layer 415 and the polarizing layer 414 can be manufactured together by a stretching process.

[0146] Figure 5 shows an embodiment in which the resin layer 510 is a polarizing layer 514. The embodiment in Figure 5 differs from the embodiment in Figure 4 in that the polymer-modified whiskers are not dispersed in the hard coat layer 18 but are dispersed in the polarizing layer 514. Furthermore, in this embodiment, only one first protective layer 515 may be provided. In this structure, the polarizing layer 514 can be manufactured by a stretching process.

[0147] In the polarizer according to the embodiment of the present invention, a resin layer is used, and the resin composition contained in the resin layer has a second polymer bonded to the surface of the whisker to obtain a polymer-modified whisker. This improves the dispersibility of the polymer-modified whisker in the resin composition, reduces the actual amount of polymer-modified whisker used, improves the chromaticity and viewing angle of the display device using the polarizer, and reduces the loss of emitted light from the display device.

[0148] Referring to Figure 6, an embodiment of the present invention also provides a display device 1000 which includes a display panel 200 and a first polarizer 300 disposed on the light-emitting side of the display panel 200 and selected from the polarizers 100 described above.

[0149] In some embodiments, the display panel 200 may be a liquid crystal display panel, a self-emissive display panel, or the like. The self-emissive display panel may be an OLED (Organic Light-Emitting Diode) display panel.

[0150] In some embodiments, the first optical functional layer of the first polarizer 300 is located on the side of the polarizer 300 away from the display panel of the polarization layer.

[0151] If the display panel 200 is a liquid crystal display panel, the display device 1000 further includes a backlight module 400 located on the side of the display panel 200 away from the first polarizer 300 and used to provide a light source, and the display device 1000 further includes a second polarizer 500 located between the backlight module 400 and the display panel 200. The second polarizer 500 may or may not be selected from the polarizers described above.

[0152] Next, the present invention will be described in more detail with reference to several embodiments. However, it should be noted that these embodiments are provided for illustrative purposes only and should not be construed in any way as limiting the present invention.

[0153] Embodiment 1 First, needle-shaped CaCO3 whiskers and ultrapure water were prepared to form a 6% mass fraction CaCO3 slurry. Sodium stearate was dissolved in an equal proportion in anhydrous ethanol and added dropwise to the calcium carbonate slurry at 85°C, resulting in a 2% mass fraction of sodium stearate. The slurry was stirred with a stirrer for 1 hour, filtered, washed with ultrapure water and anhydrous ethanol, and dried at 110°C to obtain whiskers whose surfaces were modified with sodium stearate.

[0154] Whiskers surface-modified with sodium stearate were dissolved in equal proportions in anhydrous ethanol, 3% by mass glycidyl methacrylate was added dropwise, followed by 3.5% by mass bromoisobutyryl bromide. The mixture was stirred at 60°C for 45 minutes, then 1% by mass cuprous bromide was added dropwise as a catalyst, followed by 3% by mass pentamethyldiethylenetriamine (PMDETA). The mixture was then stirred at 60°C for 80 minutes, filtered, washed with ultrapure water and anhydrous ethanol, and dried at 110°C to obtain polymer-modified whiskers with polyglycidyl methacrylate bonded to the outer surface.

[0155] The above polymer-modified whiskers are doped at a mass fraction of 6% into a gel material having a second pressure-sensitive adhesive layer of acrylic acid ester polymer (first polymer) to form a resin composition. The resin composition forms a resin layer on the surface of the first protective layer, with a thickness of 20 microns. The structure of the polarizer is shown in Figure 1.

[0156] Embodiment 2 First, a slurry of needle-shaped calcium carbonate whiskers with a solid content of 30% was dispersed in anhydrous ethanol in an equal mass ratio. Then, using calcium carbonate as the base, 3% by mass glycidyltoluene acrylate was added dropwise, followed by 3.5% by mass dibromoisobutyryl bromide. After stirring at 60°C for 45 minutes, 1% by mass cuprous bromide was added dropwise as a catalyst, followed by 3% by mass pentamethyldiethylenetriamine. The mixture was then stirred at 60°C for 80 minutes, filtered, washed with ultrapure water and anhydrous ethanol, and dried at 110°C to obtain polymer-modified whiskers with polyglyceryl methacrylate bonded to the surface of the outer layer. Part of the calcium carbonate and / or part of the surface of the calcium carbonate were modified.

[0157] Next, the polymer-modified whiskers after the first modification were prepared as a suspension of 7% calcium carbonate by mass, 0.5% phosphate ester was added at 70°C, the mixture was stirred at constant temperature for 30 minutes, filtered, washed with ultrapure water and anhydrous ethanol, and dried at 110°C to obtain polymer-modified whiskers coated with calcium phosphate salt on the surface of the outer layer.

[0158] The polymer-modified whiskers described above are doped into a gel material forming a second pressure-sensitive adhesive layer at a mass fraction of 6% to form a resin composition. This resin composition forms a resin layer on the surface of the first protective layer, with a thickness of 20 microns. The structure of the polarizer is shown in Figure 1.

[0159] Comparative Example 1 The difference from the embodiment is that the obtained whiskers surface-modified with sodium stearate were doped at a mass fraction of 7% into a gel material forming a second pressure-sensitive adhesive layer to form a comparative resin composition. A comparative resin layer was formed on the surface of the first protective layer of the comparative resin composition, and the thickness of the comparative resin layer was set to 25 microns to obtain comparative polarizer 1. Comparative polarizer 1 has the same configuration as the polarizer obtained in Embodiment 1, except that the resin layer is replaced with the comparative resin layer.

[0160] [Table 1]

[0161] The results for Embodiment 1 and Embodiment 2 are relative values ​​to Comparative Example 1, where the particle usage, optimal film thickness, chromaticity viewing angle, transmittance, and yield of Comparative Example 1 are each set to 100%.

[0162] As shown in Table 1, compared to whiskers surface-modified with sodium stearate, polymer-modified whiskers formed by bonding polymers to the surface of whiskers surface-modified with sodium stearate showed improved dispersibility due to the polymers bonded to the whisker surface, and aggregation in the resin layer was suppressed. As a result, the amount of particles used was reduced at a similar chromaticity viewing angle, the light transmittance from the display device was improved, and the product yield was also improved. Similarly, as can be seen from the results of Embodiments 1 and 2 in Table 1, compared to polymer-modified whiskers in which polymers were bonded to the surface in a single modification, polymer-modified whiskers in which calcium phosphate was bonded to the surface and then modified again showed further improved dispersibility due to the repulsive force between the charges of the phosphorus-containing groups on the surface, and the product yield was further improved.

[0163] Referring to Figures 7 and 8, these figures show the morphology and distribution results of the second pressure-sensitive adhesive layer formed on the polymer-modified whisker resin composition of Embodiment 2. Here, spectrum 41 is the result of EDS analysis performed on the region indicated by "+" in Figure 7. The result of spectrum 41 is shown in Figure 8. From the EDS analysis results, it was found that the surface of the polymer-modified whisker contains elements Ca, O, C, and P, which indicates that calcium phosphate is formed on the surface of the polymer-modified whisker and that the mass fraction of element P is 0.8.

[0164] Embodiment 3 First, a slurry of 6% CaCO3 by mass was prepared using spherical calcium carbonate with a particle size of 2 microns and ultrapure water. Sodium stearate was dissolved in an equal proportion in anhydrous ethanol and added dropwise to the calcium carbonate slurry at 85°C until the mass fraction of sodium stearate was 2%. The slurry was stirred with a stirrer for 1 hour, filtered, washed with ultrapure water and anhydrous ethanol, and dried at 110°C to obtain whiskers whose surfaces were modified with sodium stearate.

[0165] Whiskers surface-modified with sodium stearate were dissolved in equal proportions in anhydrous ethanol, 3% by mass glycidyl methacrylate was added dropwise, followed by 3.5% by mass bromoisobutyryl bromide. The mixture was stirred at 60°C for 45 minutes, then 1% by mass cuprous bromide was added dropwise as a catalyst, followed by 3% by mass pentamethyldiethylenetriamine (PMDETA). The mixture was then stirred at 60°C for 80 minutes, filtered, washed with ultrapure water and anhydrous ethanol, and dried at 110°C to obtain polymer-modified spherical calcium carbonate with polyglycidyl methacrylate bonded to the surface of the outer layer.

[0166] The polymer-modified spherical calcium carbonate described above is granulated and mixed with PET resin at a mass fraction of 0.5% to form a PET resin composition containing polymer-modified spherical calcium carbonate. This composition is then melted, extruded, and stretched to form a PET film containing polymer-modified spherical calcium carbonate. The PET film containing polymer-modified spherical calcium carbonate is formed as the first protective layer, with a thickness of 50 microns, and the polarizer structure is shown in Figure 4.

[0167] Embodiment 4 First, a slurry of spherical calcium carbonate with a particle size of 2 microns and a solid content of 30% was dispersed in anhydrous ethanol in an equal mass ratio. Then, using calcium carbonate as the base, 3% by mass of glycidyltoluene acrylate was added dropwise, followed by 3.5% by mass of dibromoisobutyryl bromide. After stirring at 60°C for 45 minutes, 1% by mass of cuprous bromide was added dropwise as a catalyst, followed by 3% by mass of pentamethyldiethylenetriamine. The mixture was then stirred at 60°C for 80 minutes, filtered, washed with ultrapure water and anhydrous ethanol, and dried at 110°C to obtain polymer-modified spherical calcium carbonate with polyglyceryl methacrylate bonded to the surface of the outer layer.

[0168] Next, the polymer-modified spherical calcium carbonate after the first modification was prepared as a suspension of calcium carbonate at a mass fraction of 7%, 0.5% phosphate ester was added at 70°C, the mixture was stirred at constant temperature for 30 minutes, filtered, washed with ultrapure water and anhydrous ethanol, and dried at 110°C to obtain polymer-modified spherical calcium carbonate with a calcium phosphate salt coating on the surface of the outer layer.

[0169] The polymer-modified spherical calcium carbonate described above is granulated and mixed with PET resin at a mass fraction of 0.4% to form a PET resin composition containing polymer-modified spherical calcium carbonate. This composition is then melted, extruded, and stretched to form a PET film containing polymer-modified spherical calcium carbonate. The PET film containing polymer-modified spherical calcium carbonate is formed as the first protective layer, with a thickness of 50 microns, and the polarizer structure is shown in Figure 4.

[0170] Comparative Example 2 The PET resin is formed to the thickness of the PET film as a comparative protective layer by melting, extrusion, and stretching processes, and the thickness of the comparative protective layer is 50 microns. The formed comparative polarizer 2 has the same configuration as in Embodiment 3, except that the first protective layer is replaced with the comparative protective layer.

[0171] Table 2 shows the results of chromaticity, viewing angle, light transmittance, and rainbow pattern obtained by placing the polarizers obtained in Embodiment 3, Embodiment 4, and Comparative Example 2 on the light-emitting side of the same model of liquid crystal display module (same liquid crystal display panel, same backlight module, and polarizer located between the liquid crystal display panel and backlight module with the same configuration).

[0172] [Table 2]

[0173] In Table 2, the particle usage amounts for Embodiment 3 and Embodiment 4 are the actual mass fractions in the first protective layer formed by the polymer-modified whisker resin composition in Embodiment 3 and Embodiment 4, respectively. In Table 2, the rainbow pattern state for Comparative Example 2, Embodiment 3, and Embodiment 4 is the actual observation result of the rainbow pattern of polarization obtained in Comparative Example 2, Embodiment 3, and Embodiment 4. In Table 2, the optimal film thickness, chromaticity viewing angle, and transmittance results for Embodiment 3 and Embodiment 4 are relative values ​​to Comparative Example 2, where the optimal film thickness, chromaticity viewing angle, and transmittance results for Comparative Example 2 are set to 100%.

[0174] As can be seen from the results in Table 2, compared to a comparative protective layer formed from a PET film without added spherical calcium carbonate, polymer-modified spherical calcium carbonate (i.e., polymer-modified whiskers) with polymers bonded to its surface improves the chromaticity viewing angle and suppresses rainbow patterns in display devices because the PET film forms a specific crystal orientation using polymer-modified spherical calcium carbonate as a crystal core during the formation process. Similarly, as can be seen from the results of Embodiments 3 and 4 in Table 2, compared to polymer-modified spherical calcium carbonate with polymers bonded to its surface in a single modification, polymer-modified spherical calcium carbonate with calcium phosphate on the surface, obtained by modifying the surface again after bonding a polymer to the surface, exhibits further improved dispersibility due to the repulsive force between charges on the phosphorus-containing groups on the surface. This reduces the amount of particles required to obtain the same chromaticity viewing angle, and the transmittance increases accordingly.

[0175] Embodiments of the present invention disclose a resin composition, a polarizer, and a display device. The resin composition comprises a first polymer and a polymer-modified whisker which includes a whisker and a second polymer bonded to the surface of the whisker, wherein the first polymer is a lipophilic polymer and the second polymer is a lipophilic polymer. The present invention provides a polymer-modified whisker by bonding the second polymer to the surface of the whisker, and since both the second polymer and the first polymer are lipophilic polymers, the dispersibility of the polymer-modified whisker in the resin composition is improved, and when the resin composition is used in a polarizer, the actual amount of polymer-modified whisker used is reduced, the chromaticity viewing angle of the display device is improved, and the loss of emitted light from the display device is reduced.

[0176] Resin compositions, polarizers, and display devices according to embodiments of the present invention have been described in detail above, and specific examples are used in this specification to illustrate the principles and embodiments of the present invention, but the embodiments described above are merely for the purpose of understanding the methods and ideas of the present invention. Those skilled in the art will be able to modify the forms for carrying out the invention based on the ideas of the present invention, and therefore this specification should not be understood as limiting the present invention.

Claims

1. The first polymer and A polymer-modified whisker dispersed within the first polymer, comprising a whisker and a second polymer bonded to the surface of the whisker, The first polymer is a lipophilic polymer, the second polymer is a lipophilic polymer, and the surface of the polymer-modified whisker further contains phosphorus elements. The surface of the polymer-modified whisker further comprises a first metal, the first metal being at least one selected from the group consisting of calcium, barium, titanium, and aluminum. The surface of the polymer-modified whisker contains at least one of the following: a phosphate of the first metal, a phosphite complex of the first metal, or a polyphosphate complex of the first metal. Resin composition.

2. The whisker is at least one selected from the group consisting of a first type of whisker, a second type of whisker, a third type of whisker, a fourth type of whisker, and a fifth type of whisker. Along the direction of extension of the long axis of the first type of whisker, the change in the diameter of the first type of whisker is 0.3 microns or less. The second type of whisker comprises a first portion, a second portion, and a central portion located between the first portion and the second portion, wherein along the direction of extension of the long axis of the second type of whisker, the change in diameter of the central portion of the second type of whisker is 1 micron or less, and along the direction away from the central portion of the second type of whisker, the diameter of the first portion of the second type of whisker gradually decreases, and the change in diameter of the second portion of the second type of whisker is 1 micron or less. The third type of whisker comprises a first portion, a second portion, and a central portion located between the first portion and the second portion, wherein along the direction of extension of the long axis of the third type of whisker, the change in the diameter of the central portion of the third type of whisker is 1 micron or less, and along the direction away from the central portion of the third type of whisker, the diameter of the first portion of the third type of whisker gradually decreases, and the diameter of the second portion of the third type of whisker gradually decreases. The fourth type of whisker comprises a first portion and a second portion, the first portion of the fourth type of whisker being sequentially connected to the second portion of the fourth type of whisker, and the diameter of the fourth type of whisker gradually decreases along a direction from the end of the first portion of the fourth type of whisker away from the second portion to the end of the second portion of the fourth type of whisker away from the first portion. The fifth type of whisker comprises a first portion and a second portion, the first portion of the fifth type of whisker being sequentially connected to the second portion of the fifth type of whisker, the diameter of the first portion of the fifth type of whisker gradually decreasing along the direction away from the second portion of the fifth type of whisker, and the diameter of the second portion of the fifth type of whisker gradually decreasing along the direction away from the first portion of the fifth type of whisker. The resin composition according to claim 1.

3. The long axis of the whisker is 10 microns or more, and the long axis of the whisker is 30 microns or less. The minimum diameter of the whisker is 0.5 microns or more, and the maximum diameter of the whisker is 2 microns or less. The resin composition according to claim 1.

4. In the resin composition, the mass fraction of the polymer-modified whiskers is 1% or more, and the mass fraction of the polymer-modified whiskers is 26% or less. The resin composition according to claim 1.

5. The second polymer comprises at least one of a polyacrylate group, an acrylate-acrylic acid copolymer group, a polycarboxylic acid water-soluble comb-shaped copolymer group, and a polydimethylsiloxane group. The resin composition according to any one of claims 1 to 4.

6. The second polymer contains the same groups as the first polymer, or the surface of the polymer-modified whisker contains the same groups as the homologue of the first polymer. The resin composition according to any one of claims 1 to 4.

7. The surface of the polymer-modified whisker contains at least one of a phosphate group, a phosphite ester group, and a polyphosphate group. The resin composition according to claim 1.

8. The polymer-modified whisker has a mass fraction of phosphorus of less than 7%. The resin composition according to claim 1.

9. The surface of the polymer-modified whisker contains at least one of the following: calcium phosphate, barium phosphite complex, barium polyphosphate complex, titanium phosphite complex, titanium polyphosphate complex, aluminum phosphite complex, and aluminum polyphosphate complex. The resin composition according to claim 8.

10. The polymer-modified whisker is at least one selected from the group consisting of a first type of whisker, a second type of whisker, a third type of whisker, a fourth type of whisker, and a fifth type of whisker. Along the direction of extension of the long axis of the first type of whisker, the change in the diameter of the first type of whisker is 0.3 microns or less. The second type of whisker comprises a first portion, a second portion, and a central portion located between the first portion and the second portion, wherein along the direction of extension of the long axis of the second type of whisker, the change in diameter of the central portion of the second type of whisker is 1 micron or less, and along the direction away from the central portion of the second type of whisker, the diameter of the first portion of the second type of whisker gradually decreases, and the change in diameter of the second portion of the second type of whisker is 1 micron or less. The third type of whisker comprises a first portion, a second portion, and a central portion located between the first portion and the second portion, wherein along the direction of extension of the long axis of the third type of whisker, the change in the diameter of the central portion of the third type of whisker is 1 micron or less, and along the direction away from the central portion of the third type of whisker, the diameter of the first portion of the third type of whisker gradually decreases, and the diameter of the second portion of the third type of whisker gradually decreases. The fourth type of whisker comprises a first portion and a second portion, the first portion of the fourth type of whisker being sequentially connected to the second portion of the fourth type of whisker, and the diameter of the fourth type of whisker gradually decreases along a direction from the end of the first portion of the fourth type of whisker away from the second portion to the end of the second portion of the fourth type of whisker away from the first portion. The fifth type of whisker comprises a first portion and a second portion, the first portion of the fifth type of whisker being sequentially connected to the second portion of the fifth type of whisker, the diameter of the first portion of the fifth type of whisker gradually decreasing along the direction away from the second portion of the fifth type of whisker, and the diameter of the second portion of the fifth type of whisker gradually decreasing along the direction away from the first portion of the fifth type of whisker. The resin composition according to claim 1.

11. The ratio of the length of the major axis of the polymer-modified whisker to the diameter of the polymer-modified whisker is 1 or more, and the ratio of the length of the major axis of the polymer-modified whisker to the diameter of the polymer-modified whisker is 50 or less. The resin composition according to claim 1.

12. The first polymer is selected from crystalline polymers, the ratio of the length of the major axis of the polymer-modified whisker to the diameter of the polymer-modified whisker is 1 or more, and the ratio of the length of the major axis of the polymer-modified whisker to the diameter of the polymer-modified whisker is 5 or less, or The first polymer is selected from amorphous polymers, and the ratio of the length of the major axis of the polymer-modified whisker to the diameter of the polymer-modified whisker is 5 or more, and the ratio of the length of the major axis of the polymer-modified whisker to the diameter of the polymer-modified whisker is 15 or less. The resin composition according to claim 1.

13. The first polymer is selected from crystalline polymers, and in the resin composition, the mass fraction of the polymer-modified whiskers is 0.05% or more, and the mass fraction of the polymer-modified whiskers is 2% or less, or The first polymer is selected from amorphous polymers, and in the resin composition, the mass fraction of the polymer-modified whiskers is 2% or more and the mass fraction of the polymer-modified whiskers is 7% or less. The resin composition according to claim 1.

14. A resin layer comprising the resin composition according to any one of claims 1 to 4, Polarizer.

15. The polarizer further comprises a polarizing layer, a first protective layer, and a hard coat layer. The resin layer is an adhesive layer, and the resin layer is bonded between the polarizing layer and the first protective layer, and the hard coat layer is located on the side of the first protective layer away from the polarizing layer, or The polarizer further includes a second protective layer, the second protective layer located on the side of the first protective layer away from the polarizing layer, the resin layer is an adhesive layer, the resin layer is bonded between the first protective layer and the second protective layer, the hard coat layer is located on the side of the second protective layer away from the polarizing layer, or, The resin layer is one of the polarizing layer, the first protective layer, the second protective layer, or the hard coat layer. The polarizer according to claim 14.

16. The orthographic projection of the major axis of the polymer-modified whisker in the resin layer in the first plane has a first orientation angle, the orthographic projection of the absorption axis of the polarizing layer in the first plane has a second orientation angle, the average difference between the first orientation angle and the second orientation angle is -15° or more, the average difference between the first orientation angle and the second orientation angle is 15° or less, the first plane and the plane on which the polarizing layer is located are parallel, and / or There is an angle between the long axis of the polymer-modified whisker and the first plane, the angle being acute, and the angle being 40° or less. The polarizer according to claim 15.

17. Display panel and The first polarizer is positioned on the light-emitting side of the display panel and is selected from the polarizers described in claim 14, Display device.

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