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 more particularly to a resin composition, a polarizer, and a display device. [Background technology]

[0002] Conventionally, a functional layer for expanding the chromaticity viewing angle of a display device has been provided on a polarizer, but the light-diffusing particles added to this functional layer often have poor dispersibility in the functional layer, which causes the light-diffusing particles to gather 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.

[0003] Therefore, there is an urgent need to develop a resin composition, a polarizer, and a display device that can solve the above technical problems. Summary of the Invention [Means for solving the problem]

[0004] The present invention provides a resin composition, a polarizer, and a display device that can reduce an increase in the actual usage amount of a display device and a decrease in light transmittance 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 comprises a first polymer and a polymer-modified whisker dispersed within a first polymer, the polymer-modified whisker comprising the whiskers and a second polymer bonded to a surface of the whiskers; The first polymer is a lipophilic polymer and the second polymer is a lipophilic polymer.

[0006] Preferably, the whiskers are at least one selected from the group consisting of a first type of whiskers, a second type of whiskers, a third type of whiskers, a fourth type of whiskers, and a fifth type of whiskers; the variation in diameter of the first type of whiskers along the direction of extension of the long axes of the first type of whiskers is 0.3 microns or less; the diameter of the central portion of the second type of whiskers varies by 1 micron or less along the direction of extension of the long axes of the second type of whiskers, the diameter of the first ends of the second type of whiskers gradually decreases along the direction away from the central portion of the second type of whiskers, and the diameter of the second ends of the second type of whiskers varies by 1 micron or less; the change in diameter of the central portion of the third type of whiskers is 1 micron or less along the direction of extension of the long axes of the third type of whiskers, the diameter of the first end portion of the third type of whiskers gradually decreases and the diameter of the second end portion of the third type of whiskers gradually decreases along the direction away from the central portion of the third type of whiskers, the first ends of the fourth type of whiskers are connected in turn to the second ends of the fourth type of whiskers, and the diameter of the fourth type of whiskers gradually decreases along a direction from the first ends of the fourth type of whiskers to the second ends of the fourth type of whiskers; the first ends of the fifth type of whiskers are connected in turn to the second ends of the fifth type of whiskers, the diameter of the first ends of the fifth type of whiskers gradually decreases along the direction away from the second ends of the fifth type of whiskers, and the diameter of the second ends of the fifth type of whiskers gradually decreases along the direction away from the first ends of the fifth type of whiskers;

[0007] Preferably, the major axis of the whiskers is 10 microns or more, and the major axis of the whiskers is 30 microns or less, The whiskers have a minimum diameter of 0.5 microns or more and a maximum diameter of 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 contains at least one of a polyacrylate group, an acrylate-acrylic acid copolymer group, a polycarboxylic acid water-soluble comb 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 whiskers contains the same groups as a homologue of the first polymer.

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

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

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

[0014] Preferably, the surface of the polymer-modified whiskers comprises at least one of a phosphate of a first metal, a phosphite ester complex of a first metal, and a polyphosphate complex of a first metal.

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

[0016] Preferably, the polymer-modified whiskers have a mass fraction of elemental phosphorus of less than 7%.

[0017] Preferably, the polymer-modified whiskers are at least one selected from the group consisting of a first type of whiskers, a second type of whiskers, a third type of whiskers, a fourth type of whiskers, and a fifth type of whiskers; the variation in diameter of the first type of whiskers along the direction of extension of the long axes of the first type of whiskers is 0.3 microns or less; the diameter of the central portion of the second type of whiskers varies by 1 micron or less along the direction of extension of the long axes of the second type of whiskers, the diameter of the first ends of the second type of whiskers gradually decreases along the direction away from the central portion of the second type of whiskers, and the diameter of the second ends of the second type of whiskers varies by 1 micron or less; the change in diameter of the central portion of the third type of whiskers is 1 micron or less along the direction of extension of the long axes of the third type of whiskers, the diameter of the first end portion of the third type of whiskers gradually decreases and the diameter of the second end portion of the third type of whiskers gradually decreases along the direction away from the central portion of the third type of whiskers, the first ends of the fourth type of whiskers are connected in turn to the second ends of the fourth type of whiskers, and the diameter of the fourth type of whiskers gradually decreases along a direction from the first ends of the fourth type of whiskers to the second ends of the fourth type of whiskers; The first ends of the fifth type of whiskers are connected in turn to the second ends of the fifth type of whiskers, and the diameter of the first ends of the fifth type of whiskers gradually decreases along the direction away from the second ends of the fifth type of whiskers, and the diameter of the second ends of the fifth type of whiskers gradually decreases along the direction away from the first ends of the fifth type of whiskers.

[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, and the ratio of the length of the major axis of the polymer-modified whiskers to the diameter of the polymer-modified whiskers is 1 or more, and the ratio of the length of the major axis of the polymer-modified whiskers to the diameter of the polymer-modified whiskers 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.

[0020] Preferably, 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.

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

[0022] Preferably, the polarizer further comprises 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 a side of the first protective layer away from the polarizing layer; or the polarizer further includes a second protective layer, the second protective layer being located on a side of the first protective layer away from the polarizing layer, the resin layer being an adhesive layer and being bonded between the first protective layer and the second protective layer, and the hard coat layer being located on a side of the second protective layer away from the polarizing 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 orthogonal projection of the long axes of the polymer-modified whiskers in the resin layer onto a first plane has a first orientation angle, the orthogonal projection of the absorption axis of the polarizing layer onto 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 is parallel to the plane on which the polarizing layer is located, and / or There is an included angle between the long axis of the polymer-modified whisker and the first plane, the included angle being an acute angle, and the included angle is 40° or less.

[0024] The present invention further provides a display device, the display device comprising: 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, polymer-modified whiskers are obtained by bonding a second polymer to the surface of the whiskers, and because both the first polymer and the second polymer are lipophilic polymers, the dispersibility of the polymer-modified whiskers in the resin composition is improved.When the resin composition is used in a polarizer, the actual amount of polymer-modified whiskers 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.

[0026] In order to more clearly describe the technical solutions in the embodiments of the present invention, the drawings that need to be used in the description of the embodiments are briefly introduced below. Obviously, the drawings in the following description are only some embodiments of the present invention. Those skilled in the art can obtain other drawings based on these drawings without any creative efforts. [Brief explanation of the drawings]

[0027] [Figure 1] 1 is a first structural schematic diagram of a polarizer according to one embodiment of the present invention; [Figure 2] FIG. 2 is a second schematic structural diagram of a polarizer according to one embodiment of the present invention. [Figure 3] FIG. 4 is a third structural schematic diagram of a polarizer according to one embodiment of the present invention. [Figure 4] FIG. 4 is a fourth structural schematic diagram of a polarizer according to one embodiment of the present invention. [Figure 5] FIG. 5 is a fifth structural schematic diagram of a polarizer according to one embodiment of the present invention. [Figure 6] 1 is a schematic structural diagram of a display device according to an embodiment of the present invention; [Figure 7] 1 is a schematic diagram showing the morphology of polymer-modified whiskers in a resin composition according to an embodiment of the present invention. FIG. [Figure 8] FIG. 8 shows the results of EDS analysis of the polymer-modified whiskers in FIG. DETAILED DESCRIPTION OF THE INVENTION

[0028] Hereinafter, technical solutions in the embodiments of the present invention will be clearly and completely described with reference to the accompanying drawings of the embodiments of the present invention. It is clear that the described embodiments are only some of the embodiments of the present invention, and not all of the embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative efforts are within the scope of protection of the present invention. Furthermore, it should be understood that the specific embodiments for implementing the invention described herein are only used 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 directions such as "upper" and "lower" generally refer to the upper and lower positions of the device in an actual use or working state, specifically the direction of the drawing in the drawings. Meanwhile, "inside" and "outside" refer to the contour of the device.

[0029] Conventionally, the dispersibility of light-diffusing particles in the functional layer for expanding the chromaticity viewing angle has been poor, resulting in the light-diffusing particles concentrating in the functional layer, which in turn increases the actual amount of light-diffusing particles used and reduces the light transmittance of the display device.

[0030] An embodiment of the present invention provides a resin composition comprising a first polymer and polymer-modified whiskers dispersed within the first polymer, the polymer-modified whiskers comprising the whiskers and a second polymer bonded to the surface of the whiskers, wherein the first polymer is an oleophilic polymer and the second polymer is an oleophilic polymer.

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

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

[0033] In this embodiment, since the first polymer and the second polymer are both lipophilic polymers, the lipophilicity of the surfaces of the polymer-modified whiskers is improved, making them more easily dispersible in the first polymer. The lipophilicity of the first polymer, the lipophilicity of the second polymer, and the lipophilicity of the polymer-modified whiskers can be measured by a surface tension test, a contact angle test, a wettability test, etc.

[0034] Specifically, the dispersibility of the polymer-modified whiskers in the first polymer is stronger than the dispersibility of the unmodified whiskers in the first polymer. That is, the mass of the whiskers added when the whiskers begin to aggregate in a first mass of the first polymer is a second mass, while the mass of the polymer-modified whiskers added when the polymer-modified whiskers begin to aggregate in a first mass of the first polymer by the same dispersion method is a third mass, and the mass of the whiskers in the third mass of the polymer-modified whiskers is greater than the second mass. That is, a larger number of the polymer-modified whiskers can be dispersed in the same mass of the first polymer without aggregation than the whiskers in the first mass.

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

[0036] Here, the shapes of the first type of whiskers, the second type of whiskers, the third type of whiskers, the fourth type of whiskers, and the fifth type of whiskers are different from one another.

[0037] In some embodiments, the variation in diameter of the whisker along the longitudinal axis of the whisker represents the magnitude of the variation in diameter of the whisker. Along the longitudinal axis of the whisker, the whisker has a first end and a second end. The first end of the whisker is in turn 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 portion of the whisker having a uniform diameter, i.e., the variation in diameter of the central portion of the whisker along the longitudinal axis of the whisker is 1 micron or less. The first end of the whisker and the second end of the whisker are portions where the diameter of the whisker can vary significantly.

[0038] In some embodiments, the change in diameter of the first type of whiskers along the direction of extension of their long axes may be 0.3 microns or less, such as 0 micron, 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, the diameter of the first ends of the first type of whiskers along the direction of extension of their long axes is the same as the diameter of the central portion of the first type of whiskers, and the diameter of the second ends of the first type of whiskers along the direction of extension of their long axes is the same as the diameter of the central portion of the first type of whiskers.

[0039] In some embodiments, the first type of whiskers may be rod-shaped, and when the first type of whiskers are rod-shaped, the cross section of the first type of whiskers in a plane perpendicular to the major axis of the first type of whiskers is circular or elliptical. When the orthogonal projection of the first type of whiskers in a plane perpendicular to the major axis of the first type of whiskers is elliptical, the diameter of the first type of whiskers is the length of the major axis of the ellipse, and the ratio of the major axis of the ellipse to the minor axis of the ellipse is greater than 1 and less than or equal to 3, such as 1.2, 1.5, 1.8, 2, 2.2, 2.5, 2.8, etc.

[0040] In some embodiments, the change in diameter of the central portion of the second type of whiskers along the extension of their long axes is 1 micron or less, such as 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 a direction away from the center of the second type of whiskers, the diameter of the first ends of the second type of whiskers gradually decreases, and the change in diameter of the second ends of the second type of whiskers 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 diameter 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, etc. In some embodiments, the diameter of the first ends of the second type of whiskers gradually decreases in a direction away from the central portion of the second type of whiskers, and the diameter of the second ends of the second type of whiskers is the same as the diameter of the central portion of the second type of whiskers.

[0041] In some embodiments, the second type of whiskers may be needle-like with a reduced diameter at one end.

[0042] In some embodiments, the orthogonal projection of the second type of whiskers on a plane perpendicular to the long axes of the second type of whiskers may be circular or elliptical, and when the orthogonal projection of the second ends of the second type of whiskers or the central portions of the second type of whiskers on a plane perpendicular to the long axes of the second type of whiskers forms an ellipse, the ratio of the major axis of the ellipse to the minor axis of the ellipse may be greater than 1 and not greater than 3, such as 1.2, 1.5, 1.8, 2, 2.2, 2.5, 2.8, etc. The cross-sectional shape formed by the first ends of the second type of whiskers on any plane perpendicular to the long axes of the second type of whiskers matches the cross-sectional shape formed by the central portions of the second type of whiskers on any plane perpendicular to the long axes of the second type of whiskers, and the area gradually decreases in the direction away from the central portions of the second type of whiskers.

[0043] In some embodiments, the change in diameter of the central portion of the third type of whiskers along the extension of their long axes is 1 micron or less, such as 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. The diameter of the first ends of the third type of whiskers gradually decreases, and the diameter of the second ends of the third type of whiskers gradually decreases, along a direction away from the central portions of the third type of whiskers. In some embodiments, the diameter of the central portions of the third type of whiskers is uniform along the direction of extension of the long axes of the third type of whiskers, and the diameters of the first ends of the third type of whiskers and the second ends of the third type of whiskers gradually change.

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

[0045] In some embodiments, the orthogonal projection of the third type of whiskers on a plane perpendicular to the major axes of the third type of whiskers may be circular or elliptical, and when the orthogonal projection of the central portions of the third type of whiskers on a plane perpendicular to the major axes of the third type of whiskers forms an ellipse, the ratio of the major axis of the ellipse to the minor axis of the ellipse may be greater than 1 and not greater than 3, such as 1.2, 1.5, 1.8, 2, 2.2, 2.5, 2.8, etc. The cross-sectional shapes formed by the first ends of the third type of whiskers and the second ends of the third type of whiskers in any plane perpendicular to the major axes of the third type of whiskers match the cross-sectional shape formed by the central portions of the third type of whiskers in any plane perpendicular to the major axes of the third type of whiskers, and the area gradually decreases in the direction away from the central portions of the third type of whiskers.

[0046] In some embodiments, the first ends of the fourth type of whiskers are in turn connected to the second ends of the fourth type of whiskers, and the diameter of the fourth type of whiskers gradually decreases along the direction from the first ends of the fourth type of whiskers to the second ends of the fourth type of whiskers.

[0047] In some embodiments, the fourth type of whiskers may be elongated and conical.

[0048] The cross section of the fourth type of whiskers in a plane perpendicular to the major axis of the fourth type of whiskers is circular or elliptical. Along the direction from the first end of the fourth type of whiskers to the second end of the fourth type of whiskers, the cross section of the fourth type of whiskers in a plane perpendicular to the major axis of the fourth type of whiskers is uniform and the area gradually decreases. When the cross section of the fourth type of whiskers in a plane perpendicular to the major axis of the fourth type of whiskers is elliptical, the diameter of the fourth type of whiskers is the length of the major axis of the ellipse, and the ratio of the major axis of the ellipse to the minor axis of the ellipse is greater than 1 and may be 3 or less, for example, 1.2, 1.5, 1.8, 2, 2.2, 2.5, 2.8, etc.

[0049] In some embodiments, the first ends of the fifth type of whiskers are connected in turn to the second ends of the fifth type of whiskers, and the diameter of the first ends of the fifth type of whiskers gradually decreases along the direction away from the second ends of the fifth type of whiskers, and the diameter of the second ends of the fifth type of whiskers gradually decreases along the direction away from the first ends of the fifth type of whiskers.

[0050] In some embodiments, the fifth type of whiskers may be bipyramidal.

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

[0052] In some embodiments, when the whiskers are at least one selected from the group consisting of the first type of whiskers, the second type of whiskers, the third type of whiskers, the fourth type of whiskers, and the fifth type of whiskers, the whiskers are preferably the third type of whiskers, which is advantageous in that the second polymer is uniformly bonded to and enveloped on the surface of the whiskers, thereby further improving the dispersibility of the polymer-modified whiskers in the first polymer. This further reduces the actual amount of the polymer-modified whiskers 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 whiskers, the second type of whiskers, the third type of whiskers, the fourth type of whiskers, and the fifth type of whiskers. Preferably, the whiskers are a mixture of the first type of whiskers, the second type of whiskers, and the third type of whiskers, or a mixture of the first type of whiskers, the fourth type of whiskers, and the fifth type of whiskers, or a mixture of the first type of whiskers, the second type of whiskers, the third type of whiskers, the fourth type of whiskers, and the fifth type of whiskers. Selecting the whiskers from at least two particles with different shapes increases the variety of the whisker shapes, which increases the optical anisotropy of the whiskers and helps to improve the contrast and brightness improving effect of the whiskers.

[0054] In some embodiments, when the whiskers are selected from the group consisting of the first type of whiskers, the second type of whiskers, and the third type of whiskers, or when the whiskers are selected from the group consisting of the first type of whiskers, the fourth type of whiskers, and the fifth type of whiskers, or when the whiskers are a mixture of the first type of whiskers, the second type of whiskers, the third type of whiskers, the fourth type of whiskers, and the fifth type of whiskers, the mass fraction of the first type of whiskers in the whiskers is 1% to 8%, 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 whiskers and / or the fourth type of whiskers in the whiskers may be 40% to 50%, for example, 41%, 42%, 43%, 44%, 45%, 46%, 47%, 48%, 49%, etc., and the mass fraction of the third type of whiskers and / or the fifth type of whiskers in the whiskers may be 45% to 55%, for example, 46%, 47%, 48%, 49%, 50%, 51%, 52%, 53%, 54%, etc. Mixing the second type of whiskers with the second type of whiskers and / or the fourth type of whiskers with the third type of whiskers and / or the fifth type of whiskers in the above ratios further helps to improve the contrast and brightness improvement effect of the resulting polymer-modified whiskers.

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

[0056] In some embodiments, the length of the whisker's major axis is the distance between the two endpoints of the whisker's major axis along the whisker's major axis. The whisker's major axis may be 10 microns or more, or 30 microns or less, such as 12 microns, 15 microns, 18 microns, 20 microns, 22 microns, 25 microns, 28 microns, 30 microns, etc. When the whisker's major axis length is within the above range, the whisker's major axis is more likely to be oriented, thereby making the polymer-modified whiskers more likely to be oriented.

[0057] In some embodiments, the minimum diameter of the whiskers is 0.5 microns or more and the maximum diameter of the whiskers is 2 microns or less, e.g., 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 better changes the direction of light propagation through the surface of the long axis of the polymer-modified whiskers.

[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 whiskers is modified with at least one of inorganic cations, inorganic anions, coupling agents, or surfactants, i.e., the surface of the whiskers has at least one of inorganic cation groups, inorganic anion groups, coupling agent groups, and surfactant groups attached thereto.

[0060] In some embodiments, the surface of the whiskers is modified with at least one of 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, polymeric phosphates, polymeric phosphates, and siloxane phosphates. Specifically, the surfaces of the whiskers are modified with at least one of 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, polymeric phosphates, polymeric phosphates, and siloxane phosphates. Preferably, the surfaces of the whiskers are modified with at least one of sulfonic acid surfactants or thio surfactants. The sulfonic acid surfactant may be selected from at least one of alkyl sulfonates and fluoroalkyl sulfonates, specifically at least one of sodium dodecyl sulfonate, sodium dodecyl benzene sulfonate, and sodium fluorododecyl sulfonate. The thio surfactant can be selected from at least one of thiol and fluoromercaptan, and specifically, can be selected from at least one of octyl mercaptan, dodecyl mercaptan, tetradecyl mercaptan, octadecyl mercaptan, fluorooctyl mercaptan, and fluorododecyl mercaptan.When a sulfonic acid surfactant is mixed with the whiskers to be surface-modified, the sulfonic acid surfactant groups form a sulfonic acid group shell layer, such as a benzene ring sulfonic acid group shell layer, on the surface of the whiskers, thereby protecting the whiskers, increasing their toughness, and helping to reduce breakage of the polymer-modified whiskers formed by the whiskers in the first resin composition. When a thio surfactant group is mixed with the whiskers to be surface-modified, the thio surfactant groups and the hydroxyl groups on the whisker surface form an OSO crosslinked network. Due to the relatively large bond energy of OSO, the surface of the whiskers further bonds with the second polymer, protecting the whiskers during the process of mixing with the first polymer to form the resin composition, reducing breakage of the polymer-modified whiskers, and advantageously enhancing the effect of improving the optical functions, such as contrast and brightness, of 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 thiol surfactant containing a fluorine substituent, specifically, for example, sodium fluorododecyl sulfonate, fluorooctyl mercaptan, or fluorododecyl mercaptan. Fluorine atoms have high stability in alkyl chains, and the bond energy of carbon-fluorine bonds is higher than that of carbon-carbon bonds. The carbon-fluorine bond has a shielding effect on carbon-carbon bonds, which is advantageous for protecting the carbon-carbon bonds, thereby improving the stability of the whisker. Furthermore, modifying the surface of the whisker with at least one of inorganic cations, inorganic anions, coupling agents, or surfactants increases the abundance of surface groups on the whisker, increasing the number of bonding sites for the second polymer and improving the variety of polymeric materials suitable for use as the second polymer.

[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 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 water-soluble comb copolymer, and a polydimethylsiloxane.

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

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

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

[0065] In some embodiments, the second polymer contains the same group as the first polymer, or the surface of the polymer-modified whisker contains the same group as a homolog of the first polymer group. 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. Incorporating the same group as the first polymer or the same group as a homolog 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 the 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 bonding the second polymer to the surface of the whiskers to form the polymer-modified whiskers can be at least one of a physical method or a chemical method. Here, the physical method can be at least one of a sol-gel method, a precipitation method, and a plasma treatment. The chemical method can be at least one of a heterogeneous phase coalescence method, a vapor-phase grafting method, a radiation-induced grafting method, a high-temperature grafting method, a photoinitiated grafting method, a melt grafting method, a solution grafting method, a solid-phase grafting method, a microencapsulation technique, and a chemical vapor deposition method. The second polymer bonds to groups on the surface of the whiskers via side groups, for example, by forming chemical or hydrogen bonds, thereby bonding to the surface of the whiskers. The main chain of the second polymer has a certain length, so that it at least partially encapsulates the whiskers, and preferably, the second polymer completely encapsulates the whiskers. The dispersibility of the second polymer in the first polymer is greater than the dispersibility of the whiskers in the first polymer, and therefore the dispersibility of the polymer-modified whiskers is greater 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, poly2-ethylhexyl acrylate, cellulose triacetate, polyethylene terephthalate, polycarbonate, polymethyl methacrylate, polyethylene naphthalate, and polycycloolefin.

[0068] In some embodiments, the surfaces of the polymer-modified whiskers further contain phosphorus. The whiskers have phosphorus on their surfaces, and a second polymer is bonded to them to obtain polymer-modified whiskers. Because both the second polymer and the first polymer are lipophilic polymers, the polymer-modified whiskers are hydrophobic and therefore less likely to absorb moisture and form clumps during transportation. Furthermore, the phosphorus-containing groups on the whisker surfaces are electrically charged, causing them to repel each other due to a repulsive force, improving the dispersibility of the polymer-modified whiskers in the resin composition. When the resin composition is used in a polarizer, the polymer-modified whiskers are more likely to be uniformly and stably dispersed, improving the chromaticity viewing angle of the display device and also improving the product yield of the polarizer and display device.

[0069] In some embodiments, the type and content of elements on the surface of the polymer-modified whiskers can be detected and obtained by an energy dispersive spectrometer (EDS). That is, the phosphorus element on the surface of the polymer-modified whiskers can be measured by EDS detection, and its content can be analyzed by EDS.

[0070] In some embodiments, the polymer-modified whiskers or the types of groups they carry can also be analyzed qualitatively or quantitatively by mass spectrometry (MS).

[0071] In some embodiments, after the surfaces of the whiskers are bonded to the second polymer, the surfaces are modified with at least one phosphorus-containing substance, such as phosphate esters, phosphites, or polyphosphates, to form a phosphorus-containing salt or complex on the surface of the polymer-modified whiskers. The phosphorus-containing salt or complex increases the surface charge of the polymer-modified whiskers and reduces the likelihood of aggregation of the polymer-modified whiskers due to repulsion of like charges. When the resin composition is applied to a polarizer, the polymer-modified whiskers are more easily dispersible in the polarizer.

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

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

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

[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 aryl phosphonate can be selected from at least one aryl group having 6 to 20 carbon atoms. The aryl group refers to an aromatic hydrocarbon group derived from an aromatic ring compound by removing one hydrogen atom. It can be a monocyclic aryl group, a tightly packed aryl group, or a polycyclic aryl group, and in the case of a polycyclic ring, at least one ring is an aromatic ring system. Furthermore, the aryl group in the aryl phosphonate can be selected from at least one aryl group having 6 to 18 carbon atoms. Furthermore, the aryl group in the aryl phosphonate can be selected from at least one aryl group having 6 to 15 carbon atoms. Furthermore, the aryl group in the aryl phosphonate can be selected from at least one aryl group having 6 to 12 carbon atoms. Furthermore, the aryl group in the aryl phosphonate 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 group and / or the 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 group can be selected from at least one of tritolyl phosphate, diphenyl monooctyl phosphate.

[0079] In some embodiments, the surface of the polymer-modified whisker contains at least one of a phosphate of the first metal, a phosphite complex of the first metal, and a polyphosphate complex of the first metal, i.e., when the surface of the polymer-modified whisker contains phosphate groups, at least some of the phosphate groups exist as a phosphate of the first metal, when the surface of the polymer-modified whisker contains phosphite groups, at least some of the phosphite groups exist as a phosphite complex of the first metal, and when the surface of the polymer-modified whisker contains polyphosphate groups, at least some of the polyphosphate groups exist 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 whiskers comprises at least one of 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 polymer-modified whisker has a mass fraction of elemental phosphorus of less than 7%. Specifically, the mass fraction of elemental 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 whiskers, the mass fraction of elemental phosphorus is greater than 0% and equal to or less than 4%.

[0084] In some embodiments, the ratio of the length of the major axis of the polymer-modified whiskers to the diameter of the polymer-modified whiskers is 1 or greater, and the ratio of the length of the major axis of the polymer-modified whiskers to the diameter of the polymer-modified whiskers is 50 or less, e.g., 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 of the polymer-modified whiskers 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 of the polymer-modified whiskers having multiple cross sections extending perpendicular to the major axis of the polymer-modified whisker, each cross section having a 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 greater, 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 using 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 of the polymer-modified whisker is controlled to be 1 or more and 5 or less. This controls the ratio of the length of the major axis of the crystal formed using the polymer-modified whisker as a core to be within an appropriate range, thereby improving the chromaticity viewing angle 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 in the resin layer formed in the polarizer due to its birefringence. Here, the improvement effect of the polymer-modified whiskers is more pronounced when the ratio of the major axis length to the diameter is between 1 and 5. At the same time, when the resin layer formed from the resin composition is applied to a polarizer, the resin composition must be filtered using a filter core with a certain pore size to remove impurities. When the ratio of the major axis length to the diameter of the polymer-modified whiskers is between 1 and 5, this matches the pore size of the filter core used when the first polymer is selected from crystalline polymers, allowing the polymer-modified whiskers to pass through the filter core, reducing the need for filter core replacement during the production process and advantageously improving polarizer production efficiency and product yield.

[0086] In some embodiments, the first polymer is selected from amorphous polymers. That is, the first polymer does not crystallize during processing of the resin composition to form the resin layer. For example, when the first polymer is selected from materials such as polymethyl methacrylate (PMMA) or acrylate polymers, the ratio of the major axis length of the polymer-modified whiskers to the diameter of the polymer-modified whiskers is preferably 1 or more and 15 or less. For example, the ratio of the major axis length of the polymer-modified whiskers to the diameter of the polymer-modified whiskers may be 10. When the resin composition is used to form a resin layer for application to a polarizer, the resin composition must be filtered using a filter core with a certain pore size to remove impurities. If the ratio of the length to diameter of the major axis of the polymer-modified whiskers is 5 or more and 15 or less, this matches the pore size of the filter core used when the first polymer is selected from amorphous polymers, allowing the polymer-modified whiskers to pass through the filter core, reducing the need for filter core replacement during the production process and advantageously improving polarizer production efficiency and product yield.

[0087] In some embodiments, the length of the major axis of the polymer-modified whiskers is 30 microns or less, such as 2 microns, 5 microns, 8 microns, 10 microns, 15 microns, 20 microns, 25 microns, 28 microns, etc. Additionally, the length of the major axis of the polymer-modified whiskers is 1 micron or more.

[0088] In some embodiments, the polymer-modified whiskers are at least one selected from the group consisting of a first type of whiskers, a second type of whiskers, a third type of whiskers, a fourth type of whiskers, and a fifth type of whiskers, each of which has a different shape.

[0089] In some embodiments, the change in diameter of the polymer-modified whisker along the longitudinal axis of the polymer-modified whisker represents the magnitude of the change in diameter of the polymer-modified whisker. The polymer-modified whisker has a first end and a second end along the longitudinal axis of the polymer-modified whisker. The first end of the polymer-modified whisker is connected in turn 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 a portion of the polymer-modified whisker having a uniform diameter, i.e., a change in diameter of the central portion of the polymer-modified whisker along the longitudinal axis of the polymer-modified whisker of 1 micron or less. The first end of the polymer-modified whisker and the second end of the polymer-modified whisker are portions of the polymer-modified whisker where the diameter may vary more.

[0090] In some embodiments, the variation in diameter of the first type of whiskers along the direction of extension of the long axes of the first type of whiskers may be 0.3 microns or less, such as 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, the diameter of the first ends of the first type of whiskers along the direction of extension of the long axes of the first type of whiskers is the same as the diameter of the central portion of the first type of whiskers, and the diameter of the second ends of the first type of whiskers is the same as the diameter of the central portion of the first type of whiskers.

[0091] In some embodiments, the first type of whiskers may be rod-shaped, and when the first type of whiskers are rod-shaped, the first type of whiskers have a circular or elliptical cross section in a plane perpendicular to the major axis of the first type of whiskers. When the orthogonal projection of the first type of whiskers in a plane perpendicular to the major axis of the first type of whiskers is elliptical, the diameter of the first type of whiskers is the length of the minor axis of the ellipse, and the ratio of the major axis of the ellipse to the minor axis of the ellipse is greater than 1 and less than or equal to 3, such as 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 whiskers in a plane perpendicular to the long axis of the first type of whiskers is triangular, quadrangular, pentagonal, or other polygonal in shape.

[0093] In some embodiments, the first type of whiskers may be rectangular or square, and when the first type of whiskers are square or rectangular, the cross section of the first type of whiskers in a plane perpendicular to the long axis of the first type of whiskers is square or rectangular, and the diameter of the first type of whiskers is the length of one side of the square or the length of the short side of the rectangle.

[0094] In some embodiments, the diameter of the central portion of the second type of whiskers varies by 1 micron or less along the direction of extension of the long axis of the second type of whiskers, and the diameter of the first ends of the second type of whiskers gradually decreases along the direction away from the central portion of the second type of whiskers, and the diameter of the second ends of the second type of whiskers varies by 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, It 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 a direction away from the center of the second type of whiskers, the diameter of the first ends of the second type of whiskers gradually decreases, and the change in diameter of the second ends of the second type of whiskers 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 thickness may be 0.25 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.In some embodiments, the diameter of the first ends of the second type of whiskers gradually decreases along a direction away from the central portion of the second type of whiskers, and the diameter of the second ends of the second type of whiskers is the same as the diameter of the central portion of the second type of whiskers.

[0095] In some embodiments, the second type of whiskers may be needle-like with a reduced diameter at one end.

[0096] In some embodiments, the orthogonal projection of the second type of whiskers on a plane perpendicular to the long axes of the second type of whiskers may be circular or elliptical, and when the orthogonal projection of the second ends of the second type of whiskers or the central portions of the second type of whiskers on a plane perpendicular to the long axes of the second type of whiskers is circular or elliptical, the ratio of the major axis of the ellipse to the minor axis of the ellipse is greater than 1 and not greater than 3, such as 1.2, 1.5, 1.8, 2, 2.2, 2.5, 2.8, etc. The cross-sectional shape formed by the first ends of the second type of whiskers in any plane perpendicular to the long axes of the second type of whiskers matches the cross-sectional shape formed by the central portions of the second type of whiskers in any plane perpendicular to the long axes of the second type of whiskers, and the area gradually decreases in a direction away from the central portions of the second type of whiskers.

[0097] In some embodiments, the change in diameter of the central portion of the third type of whiskers along the extension of their long axes is 1 micron or less, such as 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. The diameter of the first ends of the third type of whiskers gradually decreases, and the diameter of the second ends of the third type of whiskers gradually decreases, along a direction away from the central portions of the third type of whiskers. In some embodiments, the diameter of the central portions of the third type of whiskers is uniform along the direction of extension of the long axes of the third type of whiskers, and the diameters of the first ends of the third type of whiskers and the second ends of the third type of whiskers gradually change.

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

[0099] In some embodiments, the orthogonal projection of the third type of whiskers on a plane perpendicular to the major axes of the third type of whiskers may be circular or elliptical, and when the orthogonal projection of the central portions of the third type of whiskers on a plane perpendicular to the major axes of the third type of whiskers forms an ellipse, the ratio of the major axis of the ellipse to the minor axis of the ellipse may be greater than 1 and not greater than 3, such as 1.2, 1.5, 1.8, 2, 2.2, 2.5, 2.8, etc. The cross-sectional shapes formed by the first ends of the third type of whiskers and the second ends of the third type of whiskers in any plane perpendicular to the major axes of the third type of whiskers match the cross-sectional shape formed by the central portions of the third type of whiskers in any plane perpendicular to the major axes of the third type of whiskers, and the area gradually decreases in the direction away from the central portions of the third type of whiskers.

[0100] In some embodiments, the first ends of the fourth type of whiskers are in turn connected to the second ends of the fourth type of whiskers, and the diameter of the fourth type of whiskers gradually decreases along the direction from the first ends of the fourth type of whiskers to the second ends of the fourth type of whiskers.

[0101] In some embodiments, the fourth type of whiskers may be elongated and conical.

[0102] The cross section of the fourth type of whiskers in a plane perpendicular to the major axis of the fourth type of whiskers is circular or elliptical. Along the direction from the first end of the fourth type of whiskers to the second end of the fourth type of whiskers, the cross section of the fourth type of whiskers in a plane perpendicular to the major axis of the fourth type of whiskers is uniform and the area gradually decreases. When the cross section of the fourth type of whiskers in a plane perpendicular to the major axis of the fourth type of whiskers is elliptical, the diameter of the fourth type of whiskers is the length of the minor axis of the ellipse, and the ratio of the major axis of the ellipse to the minor axis of the ellipse is greater than 1 and may be 3 or less, for example, 1.2, 1.5, 1.8, 2, 2.2, 2.5, 2.8, etc.

[0103] In some embodiments, the first ends of the fifth type of whiskers are connected in turn to the second ends of the fifth type of whiskers, and the diameter of the first ends of the fifth type of whiskers gradually decreases along the direction away from the second ends of the fifth type of whiskers, and the diameter of the second ends of the fifth type of whiskers gradually decreases along the direction away from the first ends of the fifth type of whiskers.

[0104] In some embodiments, the fifth type of whiskers may be bipyramidal.

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

[0106] The cross section of the fifth type of whiskers in a plane perpendicular to the long axis of the fifth type of whiskers is circular or elliptical. Along the direction away from the second end of the fifth type of whiskers, the cross section of the first end of the fifth type of whiskers in a plane perpendicular to the long axis of the fifth type of whiskers is the same as that of the fifth type of whiskers, and the area gradually decreases. Along the direction away from the first end of the fifth type of whiskers, the cross section of the second end of the fifth type of whiskers in a plane perpendicular to the long axis of the fifth type of whiskers is the same as that of the fifth type of whiskers, and the area gradually decreases. When the cross section of the fifth type of whiskers in a plane perpendicular to the major axis of the fifth type of whiskers is elliptical, the diameter of the fifth type of whiskers is the length of the minor axis of the ellipse, and the ratio of the major axis of the ellipse to the minor axis of the ellipse is greater than 1 and less than or equal to 3, and may be, 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 whiskers, the second type of whiskers, the third type of whiskers, the fourth type of whiskers, and the fifth type of whiskers. Preferably, the polymer-modified whiskers are a mixture of the first type of whiskers, the second type of whiskers, and / or the fourth type of whiskers, the third type of whiskers, and / or the fifth type of whiskers. Selecting the polymer-modified whiskers from at least two particles with different shapes increases the variety of shapes of the polymer-modified whiskers, increasing the optical anisotropy of the whiskers and helping to improve the contrast and brightness enhancement effects of the whiskers.

[0108] In some embodiments, when the polymer-modified whiskers are a mixture of the first type of whiskers, the second type of whiskers, and / or the fourth type of whiskers, the third type of whiskers, and / or the fifth type of whiskers, the mass fraction of the first type of whiskers in the polymer-modified whiskers 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 whiskers and / or the fourth type of whiskers in the polymer-modified whiskers is 40% to 50%, and may be, for example, 41%, 42%, 43%, 44%, 45%, 46%, 47%, 48%, 49%, etc., and the mass fraction of the third type of whiskers and / or the fifth type of whiskers in the whiskers is 45% to 55%, and may be, for example, 46%, 47%, 48%, 49%, 50%, 51%, 52%, 53%, 54%, etc. Mixing the first type of whiskers, the second type of whiskers and / or the fourth type of whiskers, and the third type of whiskers and / or the fifth type of whiskers in the above ratios further helps to improve the contrast and brightness improving effects of the resulting polymer-modified whiskers.

[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 achieve significant light diffusion while not affecting the light transmittance of the resin composition.

[0110] In some embodiments, when the first polymer is selected from a crystalline polymer, the mass fraction of the polymer-modified whiskers is 0.05% or more and the mass fraction of the polymer-modified whiskers is 5% or less. When the resin composition forms a resin layer, the polymer-modified whiskers serve as a core to form a crystalline body. Therefore, when the mass fraction of the polymer-modified whiskers is within the above range, the optical properties of the polarizer, such as the chromaticity and viewing angle, can be improved. Preferably, when the first polymer is selected from a crystalline polymer, 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. This improves the chromaticity and viewing angle of the polarizer due to the polymer-modified whiskers and helps prevent a decrease in light transmittance.

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

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

[0113] In an embodiment of the present invention, a second polymer is bonded to the surface of the whisker to obtain a polymer-modified whisker, and since the first polymer is an oleophilic polymer and the second polymer is an oleophilic polymer, 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, and the chromaticity viewing angle of the display device is improved and the loss of emitted light from the display device is reduced.

[0114] Referring to FIGS. 1 to 5, an embodiment of the present invention also provides a polarizer including the above-described resin composition.

[0115] An embodiment of the present invention uses 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 whiskers, and a dispersion of the polymer-modified whiskers in the resin composition, which improves performance, reduces the actual amount of the polymer-modified whiskers used, improves the chromaticity viewing angle of a display device using a polarizer, and reduces loss of emitted light from the display device.

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

[0117] In some embodiments, the polarizer further comprises a polarizing layer, and 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 orthogonal projection of the long axis of the polymer-modified whiskers of the resin layer on a first plane has a first orientation angle, the orthogonal 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 is parallel to the surface on which the polarizing layer is located, and the long axis of the polymer-modified whiskers is parallel to or overlaps the long axis of the whisker axis. The average value of the difference between the first orientation angle and the second orientation angle was −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°, and −6°. The angle may be 0°, −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 angle difference between the orthogonal projection of the major axis of the polymer-modified whiskers onto the first surface and the orthogonal projection of the absorption axis of the polarizing layer onto the first surface to be 15° or less, the propagation direction of more light is changed by the polymer-modified whiskers, thereby enhancing the effects of improving chromaticity, viewing angle, and contrast.

[0119] In some embodiments, the included angle between the long axes of the polymer-modified whiskers and the first plane is acute and is 40° or less, such as 2°, 5°, 8°, 10°, 12°, 15°, 18°, 20°, 22°, 25°, 28°, 30°, 32°, 35°, 38°, or 40°. The long axes of the polymer-modified whiskers are spatially angled relative to the first plane, allowing more light to change its propagation direction through the polymer-modified whiskers, thereby enhancing the effects of improving chromaticity, viewing angle, and contrast.

[0120] In some embodiments, the orthogonal projection of the long axes of the polymer-modified whiskers on the second plane has a third orientation angle, the orthogonal projection of the absorption axis of the polarizing layer on the second plane has a fourth orientation angle, the average difference between the third orientation angle and the fourth orientation angle is -15° or more, the average difference between the third orientation angle and the fourth orientation angle is 15° or less, the second plane is perpendicular to the plane on which the polarizing layer is located, the second plane is non-perpendicular to the absorption axis of the polarizing layer, and the second plane is non-perpendicular to the polymer modification. By setting the absolute average value of the angle between the orthogonal projection of the long axes of the polymer-modified whiskers on the second plane and the orthogonal projection of the absorption axis of the polarizing layer on the second plane to be 15° or less, the long axes of the polymer-modified whiskers become spatially approximately parallel to the absorption axis of the polarizing layer, allowing more light to further change its propagation direction by the polymer-modified whiskers, thereby improving the chromaticity viewing angle and contrast. The average value of the difference between the third orientation angle and the fourth orientation angle was -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 angle may be 1°, 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 photographing the resin layer with an optical microscope and then performing statistical analysis using an existing program.

[0122] In some embodiments, the polarizer further includes a first protective layer, and when 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, or 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.

[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 includes 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 includes a first protective layer, a second protective layer, and a hard coat layer, the second protective layer being located on a side of the first protective layer away from the polarizing layer, and the hard coat layer being located on a side of the second protective layer away from the polarizing layer. The resin layer is an adhesive layer, and the resin layer is adhered between the first protective layer and the second protective layer. Alternatively, the resin layer is any one 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, where the first protective layer and the second protective layer are respectively disposed on opposite sides of the resin layer 10. Optionally, the resin layer 10 serves as an adhesive layer to bond the first protective layer and the second protective layer together, and the polarizing layer is disposed on the side of the first protective layer away from the resin layer 10. Optionally, the polarizer 100 further includes an adhesive layer, where the first protective layer and the second protective layer are respectively disposed on opposite sides of the resin layer 10, where the adhesive layer bonds the first protective layer and the resin layer 10 together, and the polarizing layer is disposed on the side of the first protective layer away from the resin layer 10.

[0127] An embodiment of a resin layer 10 serving as an adhesive layer is shown in Fig. 1. Polarizer 100 includes, laminated in this order, a 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 antireflection layer 19, and a surface protective layer 20. When polarizer 100 is in use, the direction from release film 11 toward surface protective layer 20 is the lamination direction of the film layers in polarizer 100 and is also the incident direction of light.

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

[0129] A 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 disposed on the release film 11. Examples of materials for the first pressure-sensitive adhesive 12 include acrylic resin.

[0130] Optical compensation layer 13 is disposed on the side of first pressure-sensitive adhesive 12 that is away from release film 11. Optical compensation layer 13 may be a compensation layer or a retardation film in which a liquid crystal compound is applied to the surface of a protective layer and then aligned and fixed.

[0131] The polarizing layer 14 is disposed 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 a polyvinyl alcohol film dyed with iodine or a polyene compound obtained by dehydrating a polyvinyl alcohol film.

[0132] The first protective layer 15 is disposed 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 support the film layer located on the first protective layer 15. The first protective layer 15 is made of at least one material selected from the group consisting of cellulose ester resins including triacetylcellulose (TAC) and the like, cyclic polyolefin resins including amorphous cyclic polyolefin (COP) and the like, polycarbonate resins, polyester resins including polyethylene terephthalate (PET) and the like, polyethersulfone resins, polysulfone resins, polyamide resins, polyimide resins, acyclic polyolefin resins, polyacrylic ester resins including poly(methyl methacrylate) resins and the like, polyvinyl alcohol resins, polyvinyl chloride resins, and polyvinylidene chloride resins, but is not limited thereto. Specifically, the material of the first protective layer 15 is PET.

[0133] The second pressure-sensitive adhesive layer 16 is disposed on the side of the first protective layer 15 that is away from the polarizing layer 14. Like 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 together. The material of the second pressure-sensitive adhesive layer 16 is the same as that of the first pressure-sensitive adhesive 12, and therefore a description thereof will be omitted here.

[0134] In this embodiment, the polymer-modified whiskers are disposed within the second pressure-sensitive adhesive layer 16 , ie, the resin layer 10 serves as the second pressure-sensitive adhesive layer 16 .

[0135] The second protective layer 17 is disposed 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 the second protective layer 17. The material of the second protective layer 17 is the same as that of the first protective layer 15, and therefore a description thereof will be omitted here. Specifically, the material of the second protective layer 17 is PET.

[0136] The hard coat layer 18 is disposed 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, waterproofness, 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 to 120 degrees Celsius. 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 (anti-reflection, AR) is provided on the side of the hard coat layer 18 that is farther from the second protective layer 17. The anti-reflection layer 19 is used to prevent reflection and scratches. The anti-reflection layer 19 is, for example, a dielectric film formed on the surface of the hard coat layer 18.

[0138] The surface protective layer 20 is used to protect the underlying film layer. The surface protective layer 20 may be a transparent resin film formed from a thermoplastic resin such as a linear polyolefin resin (such as a polypropylene resin) or a cyclic polyolefin resin (such as a norbornene resin), a cellulose ester resin such as a cellulose triacetate or a cellulose diacetate, a polyester resin such as polyethylene terephthalate, polyethylene naphthalate, or butylene terephthalate, a polycarbonate resin, a (meth)acrylic resin, or a mixture or copolymer thereof.

[0139] In addition to the above film layers, the polarizer 100 may also have other film layers, such as an antistatic layer, which are not described herein.

[0140] Fig. 2 shows a polarizer 100 bonded between a first protective layer 15 and a resin layer 210 via an adhesive layer. The embodiment in Fig. 2 differs from the embodiment in Fig. 1 in that the polymer-modified whiskers are not dispersed in the second pressure-sensitive adhesive layer 16, but rather a resin layer 210 is separately provided on the second pressure-sensitive adhesive layer 16, and the polymer-modified whiskers are dispersed in this 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 the present application, the polarizer 100 includes a first protective layer, a polarizing layer, and a hard coat layer, the first protective layer being disposed between the polarizing layer and the hard coat layer, and the resin layer being any 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 a crystalline polymer, the resin layer is the first protective layer or the second protective layer. When the first polymer of the resin composition is selected from an amorphous polymer, the resin layer is any of the first protective layer, the second protective layer, the polarizing layer, and the hard coat layer.

[0144] FIG. 3 shows a polarizer 100 in which the resin layer 310 is a hard coat layer 318. The embodiment of FIG. 3 differs from the embodiment of FIG. 2 in that the polymer-modified whiskers are dispersed in the hard coat layer 318 rather than in the second pressure-sensitive adhesive layer 16. In addition, in this embodiment, only one first protective layer 315 is provided, and the second protective layer and 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] An embodiment in which the resin layer 410 is a first protective layer 415 is shown in Figure 4. 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. 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 fabricated together by a stretching process.

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

[0147] In the polarizer according to an embodiment of the present invention, a resin layer is used, and the resin composition contained in the resin layer contains a second polymer that bonds to the surface of the whiskers to obtain polymer-modified whiskers, improving the dispersibility of the polymer-modified whiskers in the resin composition and reducing the actual amount of polymer-modified whiskers used. In addition, the chromaticity viewing angle of a display device using the polarizer is improved, and the loss of emitted light from the display device is reduced.

[0148] Referring to FIG. 6, an embodiment of the present invention also provides a display device 1000 including a display panel 200 and a first polarizer 300 arranged 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, etc. The self-emissive display panel may be an OLED (Organic Light-Emitting Diode) display panel.

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

[0151] When the display panel 200 is a liquid crystal display panel, the display device 1000 further includes a backlight module 400 located on a 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] The present invention will now be described in more detail with reference to some embodiments, however, it should be noted that these embodiments are provided for illustrative purposes only and should not be construed as limiting the present invention in any way.

[0153] Embodiment 1 First, needle-shaped CaCO3 whiskers and ultrapure water were mixed to prepare a CaCO3 slurry with a mass fraction of 6%. Sodium stearate was dissolved in anhydrous ethanol in equal proportions and added dropwise to the calcium carbonate slurry at 85°C. The mass fraction of sodium stearate was 2%. The mixture 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] The whiskers surface-modified with sodium stearate were dissolved in equal proportions in absolute ethanol, and then 3% by mass of glycidyl methacrylate and 3.5% by mass of bromoisobutyryl bromide were added dropwise. After stirring at 60°C for 45 minutes, 1% by mass of copper bromide was added dropwise as a catalyst, and 3% by mass of pentamethyldiethylenetriamine (PMDETA) was added dropwise. The mixture was then stirred at a constant temperature of 60°C for 80 minutes, filtered, washed with ultrapure water and absolute ethanol, and dried at 110°C to obtain polymer-modified whiskers with polyglycidyl methacrylate bonded to the surface of the outer layer.

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

[0156] Embodiment 2 First, a slurry of acicular calcium carbonate whiskers with a solids content of 30% was dispersed in anhydrous ethanol at equal mass ratios. Subsequently, 3% by mass of glycidyl toluene acrylate and 3.5% by mass of dibromoisobutyryl bromide were added dropwise to the calcium carbonate mixture. After stirring at a constant temperature of 60°C for 45 minutes, 1% by mass of copper bromide catalyst was added dropwise, followed by 3% by mass of pentamethyldiethylenetriamine. The mixture was then stirred at a constant temperature of 60°C for 80 minutes. The mixture was then filtered, washed with ultrapure water and anhydrous ethanol, and dried at 110°C to obtain polymer-modified whiskers with polyglyceryl methacrylate bonded to the outer surface. A portion of the calcium carbonate and / or a portion of the surface of the calcium carbonate was modified.

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

[0158] The above polymer-modified whiskers are doped into a gel material forming a second pressure-sensitive adhesive layer at a mass fraction of 6% to form a resin composition, which forms a resin layer on the surface of the first protective layer. The resin layer has a thickness of 20 microns, and 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. The comparative resin composition was used to form a comparative resin layer on the surface of the first protective layer, and the comparative resin layer had a thickness of 25 microns, thereby obtaining comparative polarizer 1. Comparative polarizer 1 has the same configuration as the polarizer obtained in embodiment 1, except that the resin layer was replaced with the comparative resin layer.

[0160] [Table 1]

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

[0162] The results in Table 1 show that, compared with whiskers surface-modified with sodium stearate, polymer-modified whiskers formed by bonding a polymer to the surface of whiskers surface-modified with sodium stearate have improved dispersibility due to the polymer bonded to the whisker surface and suppressed aggregation in the resin layer, thereby reducing the amount of particles used at the same chromaticity viewing angle, improving the light transmittance from the display device, and improving product yield. Similarly, as can be seen from the results of Embodiments 1 and 2 in Table 1, compared with polymer-modified whiskers surface-modified with a single modification to bond a polymer to the surface, polymer-modified whiskers surface-modified with calcium phosphate by bonding a polymer to the surface and then further modifying the surface further improved dispersibility due to the repulsive force between the charges of the groups having a phosphorus-containing element on the surface, and further improved product yield.

[0163] 7 and 8 show the morphology and distribution of the polymer-modified whiskers in the second pressure-sensitive adhesive layer formed on the resin composition of embodiment 2. Spectrum 41 is the result of EDS analysis of the area indicated by the "+" in FIG. 7. The results of spectrum 41 are shown in FIG. 8. The EDS analysis results reveal that the surfaces of the polymer-modified whiskers contain Ca, O, C, and P elements, indicating that calcium phosphate is formed on the surfaces of the polymer-modified whiskers and that the mass fraction of P is 0.8.

[0164] Embodiment 3 First, spherical calcium carbonate with a particle size of 2 microns and ultrapure water were mixed to prepare a CaCO3 slurry with a mass fraction of 6%. Sodium stearate was dissolved in anhydrous ethanol in equal proportions and added dropwise to the calcium carbonate slurry at 85°C, resulting in a mass fraction of sodium stearate of 2%. The mixture 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] The whiskers surface-modified with sodium stearate were dissolved in equal proportions in absolute ethanol, and then 3% by mass of glycidyl methacrylate and 3.5% by mass of bromoisobutyryl bromide were added dropwise. After stirring at 60°C for 45 minutes, 1% by mass of copper bromide was added dropwise as a catalyst, and 3% by mass of pentamethyldiethylenetriamine (PMDETA) was added dropwise. The mixture was then stirred at a constant temperature of 60°C for 80 minutes, filtered, washed with ultrapure water and absolute 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 was granulated and mixed with PET resin at a mass fraction of 0.5% to form a PET resin composition containing the polymer-modified spherical calcium carbonate, which was then melted, extruded, and stretched to form a PET film containing the polymer-modified spherical calcium carbonate. The PET film containing the polymer-modified spherical calcium carbonate was formed as a first protective layer, with a thickness of 50 microns. The polarizer structure is shown in Figure 4.

[0167] Embodiment 4 First, a slurry of spherical calcium carbonate with a solid content of 30% and a particle size of 2 microns was dispersed in absolute ethanol at an equal mass ratio. Subsequently, glycidyl toluene acrylate at a mass fraction of 3% and dibromoisobutyryl bromide at a mass fraction of 3.5% were added dropwise to the calcium carbonate as a base, and the mixture was stirred at a constant temperature of 60°C for 45 minutes. Then, copper bromide at a mass fraction of 1% was added dropwise as a catalyst, and pentamethyldiethylenetriamine at a mass fraction of 3% was added dropwise. The mixture was then stirred at a constant temperature of 60°C for 80 minutes. The mixture was then filtered, washed with ultrapure water and absolute 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 into a calcium carbonate suspension with a mass fraction of 7%, to which 0.5% of a phosphate ester was added at 70°C. The suspension was stirred at a constant temperature for 30 minutes, filtered, washed with ultrapure water and absolute ethanol, and dried at 110°C to obtain polymer-modified spherical calcium carbonate having an outer layer coated with calcium phosphate salt.

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

[0170] Comparative Example 2 The PET resin was melted, extruded, and stretched to form a comparative protective layer having a thickness of 50 microns. The comparative polarizer 2 thus formed had the same structure as that of the polarizer of Example 3, except that the first protective layer was replaced with the comparative protective layer.

[0171] The polarizers obtained in embodiment 3, embodiment 4, and comparative example 2 were placed on the light output side of the same model of liquid crystal display module (the same liquid crystal display panel, the same backlight module, and a polarizer positioned between the liquid crystal display panel and the backlight module of the same configuration), and the results of the chromaticity viewing angle, light transmittance, and rainbow pattern obtained are shown in Table 2.

[0172] [Table 2]

[0173] In Table 2, the amounts of particles used in Embodiments 3 and 4 are the actual mass fractions in the first protective layers formed from the resin compositions of polymer-modified whiskers in Embodiments 3 and 4, respectively. In Table 2, the rainbow pattern states for Comparative Example 2, Embodiment 3, and Embodiment 4 are the observation results of the actual rainbow pattern of polarized light obtained in Comparative Example 2, Embodiment 3, and Embodiment 4. In Table 2, the results for optimal film thickness, chromaticity viewing angle, and transmittance for Embodiments 3 and 4 are relative values ​​to Comparative Example 2, when the results for optimal film thickness, chromaticity viewing angle, transmittance, etc. for Comparative Example 2 are each 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 spherical calcium carbonate, the polymer-modified spherical calcium carbonate (i.e., polymer-modified whiskers) with a polymer bonded to its surface improves the chromaticity viewing angle and suppresses rainbow patterns in display devices by forming a specific crystal orientation with the polymer-modified spherical calcium carbonate as the crystalline core during the PET film formation process. Similarly, as can be seen from the results in Examples 3 and 4 in Table 2, compared to polymer-modified spherical calcium carbonate with a polymer bonded to its surface by a single modification, the polymer-modified spherical calcium carbonate, which is modified again after bonding a polymer to its surface to provide calcium phosphate on its surface, has improved dispersibility due to the repulsive forces between the charges of the phosphorus-containing element-containing groups on its surface. This reduces the amount of particles required to achieve the same chromaticity viewing angle, and the transmittance also increases accordingly.

[0175] The present invention discloses a resin composition, a polarizer, and a display device. The resin composition includes a first polymer and polymer-modified whiskers dispersed within the first polymer, the whiskers including a second polymer bonded to the surface of the whiskers. The first polymer is an oleophilic polymer, and the second polymer is an oleophilic polymer. The present invention provides polymer-modified whiskers by bonding the second polymer to the surface of the whiskers. Because both the second polymer and the first polymer are oleophilic polymers, the dispersibility of the polymer-modified whiskers in the resin composition is improved. When the resin composition is used in a polarizer, the actual amount of polymer-modified whiskers used is reduced, and the chromaticity viewing angle of the display device is improved, while the loss of emitted light from the display device is reduced.

[0176] The resin composition, polarizer, and display device according to the embodiments of the present invention have been described in detail above, and specific examples are used in the present specification to explain the principles and embodiments of the present invention. However, the above-described embodiments are merely for understanding the method and concept of the present invention. Those skilled in the art can change the mode for carrying out the invention based on the concept of the present invention, and therefore the present specification should not be understood as limiting the present invention.

Claims

1. a first polymer; and polymer-modified whiskers dispersed within the first polymer, the polymer-modified whiskers comprising whiskers and a second polymer bonded to a surface of the whiskers; the first polymer is a lipophilic polymer, the second polymer is a lipophilic polymer, and the surface of the polymer-modified whisker further contains a phosphorus element; In the polymer-modified whiskers, the mass fraction of phosphorus element is less than 7%. Resin composition.

2. the whiskers are at least one selected from the group consisting of first type whiskers, second type whiskers, third type whiskers, fourth type whiskers, and fifth type whiskers; the variation in diameter of the first type of whiskers along the direction of extension of the long axes of the first type of whiskers is 0.3 microns or less; the diameter of the central portion of the second type of whiskers varies by 1 micron or less along the direction of extension of the long axes of the second type of whiskers, the diameter of the first ends of the second type of whiskers gradually decreases along the direction away from the central portion of the second type of whiskers, and the diameter of the second ends of the second type of whiskers varies by 1 micron or less; the change in diameter of the central portion of the third type of whiskers is 1 micron or less along the direction of extension of the long axes of the third type of whiskers, the diameter of the first ends of the third type of whiskers gradually decreases and the diameter of the second ends of the third type of whiskers gradually decreases along the direction away from the central portion of the third type of whiskers, the first ends of the fourth type of whiskers are connected in turn to the second ends of the fourth type of whiskers, and the diameter of the fourth type of whiskers gradually decreases along a direction from the first ends of the fourth type of whiskers to the second ends of the fourth type of whiskers; the first ends of the fifth type of whiskers are connected in turn to the second ends of the fifth type of whiskers, the diameter of the first ends of the fifth type of whiskers gradually decreases along a direction away from the second ends of the fifth type of whiskers, and the diameter of the second ends of the fifth type of whiskers gradually decreases along a direction away from the first ends of the fifth type of whiskers; The resin composition according to claim 1.

3. The major axis of the whiskers is 10 microns or more and 30 microns or less, The minimum diameter of the whiskers is 0.5 microns or more, and the maximum diameter of the whiskers 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 contains 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; 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 whiskers contains the same groups as the homologues 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 group, and a polyphosphate group; The resin composition according to claim 1.

8. 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 resin composition according to claim 1.

9. the surface of the polymer-modified whisker contains at least one of a phosphate of the first metal, a phosphite ester complex of the first metal, and a polyphosphate complex of the first metal; The resin composition according to claim 8.

10. the surface of the polymer-modified whisker contains at least one of 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 9.

11. the polymer-modified whiskers are at least one selected from the group consisting of first type whiskers, second type whiskers, third type whiskers, fourth type whiskers, and fifth type whiskers; the variation in diameter of the first type of whiskers along the direction of extension of the long axes of the first type of whiskers is 0.3 microns or less; the diameter of the central portion of the second type of whiskers varies by 1 micron or less along the direction of extension of the long axes of the second type of whiskers, the diameter of the first ends of the second type of whiskers gradually decreases along the direction away from the central portion of the second type of whiskers, and the diameter of the second ends of the second type of whiskers varies by 1 micron or less; the change in diameter of the central portion of the third type of whiskers is 1 micron or less along the direction of extension of the long axes of the third type of whiskers, the diameter of the first ends of the third type of whiskers gradually decreases and the diameter of the second ends of the third type of whiskers gradually decreases along the direction away from the central portion of the third type of whiskers, the first ends of the fourth type of whiskers are connected in turn to the second ends of the fourth type of whiskers, and the diameter of the fourth type of whiskers gradually decreases along a direction from the first ends of the fourth type of whiskers to the second ends of the fourth type of whiskers; the first ends of the fifth type of whiskers are connected in turn to the second ends of the fifth type of whiskers, the diameter of the first ends of the fifth type of whiskers gradually decreases along a direction away from the second ends of the fifth type of whiskers, and the diameter of the second ends of the fifth type of whiskers gradually decreases along a direction away from the first ends of the fifth type of whiskers; The resin composition according to claim 1.

12. 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.

13. the first polymer is selected from crystalline polymers, and the ratio of the length of the major axis of the polymer-modified whiskers to the diameter of the polymer-modified whiskers is 1 or greater, and the ratio of the length of the major axis of the polymer-modified whiskers to the diameter of the polymer-modified whiskers 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.

14. 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.

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

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

17. the orthogonal projection of the long axes of the polymer-modified whiskers in the resin layer onto a first plane has a first orientation angle, the orthogonal projection of the absorption axis of the polarizing layer onto 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, and the first plane is parallel to the plane on which the polarizing layer is located; and / or an included angle between the long axis of the polymer-modified whisker and the first plane, the included angle being an acute angle, and the included angle being 40° or less; The polarizer of claim 16.

18. A display panel; a first polarizer selected from the polarizers according to claim 15, the first polarizer being disposed on the light-emitting side of the display panel; Display device.

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