CN115308830A - Reflective polarizer film and preparation method and application thereof - Google Patents

Abstract

The invention relates to a reflective polarizer film and a preparation method and application thereof, wherein the reflective polarizer comprises a reflective polarizer base material and a coating with protrusions on the surface, which are arranged in a laminated manner; the coating comprises the following raw materials in parts by weight: 30-70 parts of acrylic acid active monomer, 10-40 parts of acrylic resin, 1-10 parts of photoinitiator and 0.1-5 parts of auxiliary agent; the preparation raw materials are solvent-free. The reflective polarizer film has high haze and hardness, excellent finished picture and short production period.

Description

Reflective polarizer film and preparation method and application thereof

Technical Field

The invention relates to the technical field of display, in particular to a reflective polarizer film and a preparation method and application thereof.

Background

As the number of display devices using the OLED increases, the market share of the conventional LCD display devices is also gradually decreasing. This is because LCD has a major disadvantage in some performance aspects compared to OLED, and one of the important indicators is display brightness, the brightness of OLED device can reach over 900nit, while LCD device can hardly reach 600nit. Therefore, for the LCD device, one of the improvement ideas is to improve the brightness of the LCD display on the premise of ensuring the job number of the television. The reflective polarizer (DBEF) can utilize the light emitted from the LCD backlight as much as possible by the birefringence principle of light, thereby improving the brightness of the LCD display. However, DBEF cannot be used alone because it has a smooth surface and absorbs and moire with the polarized light under the LCD screen.

CN102563530a discloses a light diffusion film formed of a transparent thermoplastic resin and having an embossed pattern on at least one side, wherein the embossed pattern has an average roughness (Ra) of 1.5 μm or less and a peak number (Rpc) of 100 peaks/cm or more, and a backlight unit including the same. The light diffusion film constitutes an outer layer of the DBEF, and the surface roughness of the light diffusion film is controlled to solve the problem of locally occurring glare of the final screen

In the prior art, a rough surface is formed on the surface of DBEF by coating micro-bead particles, so that the phenomena of adsorption and moire with polarized light below an LCD screen are prevented; however, DBEF is very problematic in coating processes because it has several characteristics in itself: (1) The DBEF surface is a non-crystalline PET resin which is easily damaged by solvents such as butanone, toluene, butyl ester, ethyl acetate and the like, so that the surface of the DBEF surface is easily damaged by using a coating liquid containing the solvents; (2) The thickness of DBEF is less than 100 mu m, the thickness is very thin, when the DBEF passes through an oven (a solvent in a coating liquid needs to be volatilized, and the DBEF needs to pass through a plurality of high-temperature ovens), the temperature of the oven cannot be too high (less than 80 degrees), and the DBEF can be warped and softened due to too high temperature, so that the DBEF can be baked only at low temperature for a long time, and the production efficiency is low.

In view of the above, it is important to develop a reflective polarizer film having a short production cycle and suitable for use in LCD display devices.

Disclosure of Invention

In view of the defects of the prior art, the present invention aims to provide a reflective polarizer film, which has high haze and hardness, excellent finished picture and short production period, and a preparation method and an application thereof.

In order to achieve the purpose, the invention adopts the following technical scheme:

in a first aspect, the present invention provides a reflective polarizer film, which includes a reflective polarizer base material and a coating layer having protrusions on a surface thereof, which are stacked;

the coating comprises the following raw materials in parts by weight:

the preparation raw materials are solvent-free.

According to the invention, the preparation raw materials of the coating are solvent-free, the base material of the reflective polarizer is not corroded, the formed reflective polarizer film does not need complex equipment, the energy consumption is low, and the production process is solvent-free, environment-friendly and green; the components of the preparation raw material of the coating are matched with each other, and the formed coating has excellent performance and is suitable for LCD display devices.

In the present invention, the acrylic reactive monomer is 30 to 70 parts by weight, for example, 35 parts, 40 parts, 45 parts, 50 parts, 55 parts, 60 parts, 65 parts, etc.

The acrylic resin is 10-40 parts by weight, such as 15 parts, 20 parts, 25 parts, 30 parts, 35 parts and the like.

The photoinitiator is 1-10 parts by weight, such as 2 parts, 4 parts, 6 parts, 8 parts and the like.

The assistant is 0.1-5 parts by weight, such as 0.5 part, 1 part, 2 parts, 3 parts, 4 parts and the like.

Preferably, the refractive index of the coating is 1.48-1.5, such as 1.49, 1.5, etc.

In the invention, the refractive index of the coating is between 1.48 and 1.5, and the test standard is GB/T614-2021; the reason for controlling the refractive index in the range is that the refractive index of the resin is matched with that of the base material, and the refractive index of the base material is about 1.49; the light scattering is poor and the whole shielding is poor due to the higher refractive index; a lower refractive index causes total reflection, which reduces the light utilization rate, resulting in a lower gain.

Preferably, the coating has a shore D hardness of 65-70, such as 66, 67, 68, 69, and the like.

According to the invention, the Shore D hardness of the coating is 65-70, and the test standard is the Shore hardness test standard; the reason for controlling in this range is to prevent adsorption and warpage; the high hardness can cause the shrinkage rate of the resin to be large, the product has the problem of warping, and the resin is hard and has the risk of scratching other materials; the lower hardness can cause the resin to be softer and the surface to deform after being stressed, so that the materials are mutually absorbed together.

Preferably, the thickness of the reflective polarizer substrate is 50 to 70 μm, for example 55 μm, 60 μm, 65 μm, and the like.

Preferably, the thickness of the coating is 1-10 μm, such as 2 μm, 4 μm, 6 μm, 8 μm, and the like.

Preferably, the acrylic reactive monomer comprises any one of or a combination of at least two of o-phenylphenoxyethyl acrylate, ethoxylated phenol acrylate, 2-phenoxyethyl acrylate, isobornyl acrylate, acryloylmorpholine, tetrahydrofurfuryl acrylate, N-dimethylacrylamide, 1,6-hexanediol diacrylate, tripropylene glycol diacrylate, ethoxylated bisphenol a diacrylate, trimethylolpropane triacrylate, pentaerythritol tetraacrylate, or dipentaerythritol hexapentaacrylate, wherein typical but non-limiting combinations include: combinations of o-phenylphenoxyethyl acrylate, ethoxylated phenol acrylate, and 2-phenoxyethyl acrylate, combinations of acryloylmorpholine, tetrahydrofurfuryl acrylate, N-dimethylacrylamide, 1,6-hexanediol diacrylate, tripropylene glycol diacrylate, and ethoxylated bisphenol a diacrylate, combinations of trimethylolpropane triacrylate, pentaerythritol tetraacrylate, and dipentaerythritol hexapentaacrylate, and the like. Further preferred is any one or a combination of at least two of o-phenylphenoxyethyl acrylate, 2-phenoxyethyl acrylate, acryloylmorpholine, isobornyl acrylate, acryloylmorpholine N, N-dimethylacrylamide, 1,6-hexanediol diacrylate, tripropylene glycol diacrylate, ethoxylated bisphenol a diacrylate, trimethylolpropane triacrylate or pentaerythritol triacrylate.

Preferably, the ethoxylated bisphenol-a diacrylate comprises any one or a combination of at least two of ethoxylated (4) bisphenol-a diacrylate, ethoxylated (10) bisphenol-a diacrylate, ethoxylated (20) bisphenol-a diacrylate or ethoxylated (30) bisphenol-a diacrylate, wherein typical but non-limiting combinations include: a combination of ethoxylated (4) bisphenol a diacrylate and ethoxylated (10) bisphenol a diacrylate, a combination of ethoxylated (20) bisphenol a diacrylate and ethoxylated (30) bisphenol a diacrylate, a combination of ethoxylated (4) bisphenol a diacrylate, ethoxylated (10) bisphenol a diacrylate, ethoxylated (20) bisphenol a diacrylate and ethoxylated (30) bisphenol a diacrylate, and the like, with ethoxylated (4) bisphenol a diacrylate and/or ethoxylated (10) bisphenol a diacrylate being more preferred.

In the present invention, the term "4" in the ethoxylated (4) bisphenol A diacrylate means: there are four ethoxy modifications, ethoxylated (10) bisphenol A diacrylate, ethoxylated (20) bisphenol A diacrylate and ethoxylated (30) bisphenol A diacrylate.

Preferably, the acrylic resin comprises any one of or a combination of at least two of polyurethane acrylic, epoxy acrylic, polyester acrylic or polycarbonate acrylic, wherein typical but non-limiting combinations include: a combination of a urethane acrylic resin and an epoxy acrylic resin, a combination of a polyester acrylic resin and a polycarbonate acrylic resin, a combination of a urethane acrylic resin, an epoxy acrylic resin, a polyester acrylic resin, and a polycarbonate acrylic resin, and the like, and further a urethane acrylic resin and/or a polyester acrylic resin are preferable.

In the present invention, the reason why the acrylic resin is preferably a urethane acrylic resin and/or a polyester acrylic resin is that: the formed resin is stable, UV-resistant, ageing-resistant and not easy to yellow.

Preferably, the photoinitiator comprises any one or a combination of at least two of 1-hydroxycyclohexyl phenyl ketone (PI 184), 2-methyl-1- (4-methylthiophenyl) -2-morpholinyl-1-propanone (PI 907), 2,4,6-trimethylbenzoylphenylphosphonic acid ethyl ester (PI TPO), benzophenone (PI BP), phenyl bis (2,4,6-trimethylbenzoyl) phosphine oxide (PI 819), or 2-hydroxy-2-methyl propiophenone (PI 1173), wherein typical but non-limiting combinations include: a combination of 1-hydroxycyclohexylphenylketone and 2-methyl-1- (4-methylthiophenyl) -2-morpholino-1-propanone, a combination of 2,4,6-trimethylbenzoylphenylphosphonic acid ethyl ester, benzophenone, phenylbis (2,4,6-trimethylbenzoyl) phosphine oxide and 2-hydroxy-2-methylpropiophenone, a combination of 1-hydroxycyclohexylphenylketone, 2-methyl-1- (4-methylthiophenyl) -2-morpholino-1-propanone, 2,4,6-trimethylbenzoylphenylphosphonic acid ethyl ester, benzophenone, phenylbis (2,4,6-trimethylbenzoyl) phosphine oxide and 2-hydroxy-2-methylpropiophenone, and the like; further, any one or a combination of at least two of PI 184, PI TPO, PI 819, and PI 1173 is preferable.

Preferably, the adjuvant comprises a silicone adjuvant and/or an antistatic agent.

Preferably, the antistatic agent comprises a modified polythiophene-type antistatic agent.

In a second aspect, the present invention provides a method for preparing the reflective polarizer film of the first aspect, the method comprising the steps of:

mixing an acrylic acid active monomer, acrylic resin, a photoinitiator and an auxiliary agent, coating the mixture on the surface of a reflective polarizer substrate, and curing to form a coating, thereby obtaining the reflective polarizer film.

Preferably, the coating is prepared from raw materials having a viscosity of 300-500cP, such as 320cP, 340cP, 360cP, 380cP, 400cP, 420cP, 440cP, 460cP, 480cP, etc., at 25 ℃ prior to the curing reaction.

Preferably, the means of mixing comprises stirring.

Preferably, the mixing further comprises the operation of filtration and purification.

Illustratively, the filtration purification comprises filtering the mixed material through a filter bag of 0.1 to 1.0 μm (e.g., 0.2 μm, 0.4 μm, 0.6 μm, 0.8 μm, etc., and more preferably 0.5 μm).

Preferably, the rotational speed of the agitation is 500-2000rpm, such as 600rpm, 800rpm, 1000rpm, 1200rpm, 1400rpm, 1600rpm, 1800rpm, etc.

Preferably, the stirring time is 30-120min, such as 40min, 60min, 80min, 100min, and the like.

Preferably, the curing is performed simultaneously with the rolling using a mold having pits provided on the surface thereof.

In the invention, the microstructure of the mold can be transferred to the front surface of the reflective polarizer film to form a coating with a rough surface.

Illustratively, the surface of the mold has random circular pits having a diameter of 10-20 μm (e.g., 12 μm, 14 μm, 16 μm, 18 μm, etc.), a surface roughness RZ of 2-4 μm (e.g., 2.5 μm, 3 μm, 3.5 μm, etc.), and a haze of 70-90% (e.g., 72%, 74%, 76%, 78%, 80%, 82%, 84%, 86%, 88%, etc.).

Illustratively, the material of the mold surface is precision electroplating copper, the thickness of a copper layer is less than 300 μm (such as 280 μm, 260 μm, 240 μm, 220 μm and the like), and the copper hardness is 200-250HB (such as 210HB, 220HB, 230HB, 240HB and the like).

Preferably, the curing comprises photo-curing.

Preferably, the UV dominant wavelength of the photocure is 360-450nm, such as 380nm, 400nm, 420nm, 440nm, and the like.

Preferably, the energy of the photocuring is > 200mj, e.g., 220mj, 240mj, 260mj, 280mj, etc.

As a preferred technical scheme, the preparation method comprises the following steps:

stirring acrylic acid active monomers, acrylic resin, a photoinitiator and an auxiliary agent at the rotating speed of 500-2000rpm for 30-120min, mixing, filtering, purifying, coating on the surface of a reflective polarizer substrate, carrying out photocuring under the conditions that the ultraviolet dominant wavelength is 360-450nm and the energy is more than 200mj, and rolling by adopting a die with pits arranged on the surface to form a coating, thus obtaining the reflective polarizer film.

In a third aspect, the present invention provides an LCD device comprising the reflective polarizer film of the first aspect.

Compared with the prior art, the invention has the following beneficial effects:

(1) In the invention, the raw materials for preparing the coating of the reflective polarizer film do not contain solvents, so that the film has high haze, high hardness and excellent finished picture, and the production period is shortened.

(2) In the invention, the haze of the reflective polarizer film is more than 70%, the refractive index is between 1.48 and 1.49, the Shore D hardness is between 65 and 70, the formed LCD device has excellent picture display, and the production speed is more than 20M/min.

Drawings

FIG. 1 is a flow chart of a method of the present invention;

fig. 2 is a schematic view of the structure of a rolled mold used in the method.

Detailed Description

For the purpose of facilitating an understanding of the present invention, the present invention will now be described by way of examples. It should be understood by those skilled in the art that the examples are only for the understanding of the present invention and should not be construed as the specific limitations of the present invention.

In the present invention, purchase information of some raw materials in each embodiment is as follows:

polyester acrylic resin: purchased from sartomer under the brand name CN704;

polyurethane acrylic resin: purchased from a new Fengxi material with the brand number of PU5158;

polycarbonate acrylic resin: purchased from sardoma under the brand name CN991;

epoxy acrylic resin: purchased from sartomer under the brand name CN104;

ethoxylated (10) bisphenol a diacrylate: purchased from changxing under the brand name EM2261;

o-phenylphenoxyethyl acrylate: purchased from changxing and having the trade mark EM2105;

acryloyl morpholine: purchased from Ruo chemical industry and sold as LuCure248;

organosilicon auxiliary agent: purchased from Bike or Digao under the designations BYK 333, BYK 3505, TEGO 450;

antistatic agent: purchased from a beacon under the brand name HC-A04-B01, HC-R06D, SAS-PE-SO3-N01; oncan chemical, brand AS-M1.

Example 1

This example provides a reflective polarizer film, which includes a reflective polarizer base material (polyethylene terephthalate) and a coating layer (6 μm thick) having protrusions on the surface, which are stacked;

the coating is prepared from the following raw materials in parts by weight:

the preparation raw materials are solvent-free.

The reflective polarizer film is prepared by the following method, and the method comprises the following steps:

stirring acrylic acid active monomers, acrylic resin, a photoinitiator, an organic silicon assistant and an antistatic agent at the rotation speed of 1000rpm for 80min, mixing, filtering in a filter bag with the diameter of 0.5 mu m, coating on the surface of a reflective polarizer substrate, carrying out photocuring under the conditions that the ultraviolet dominant wavelength is 365nm and the energy is 250mj, and rolling by adopting a die with pits arranged on the surface to form a coating, thereby obtaining the reflective polarizer film.

Wherein, the flow chart of the method is shown in figure 1, the structural diagram of the rolled mould is shown in figure 2, the surface of the mould is provided with random circular pits, the average diameter of the circular pits is 15 μm, RZ is 3 μm, the material of the surface of the mould is precision electroplating copper, the thickness of a copper layer is 250 μm, and the copper hardness is 220HB.

Example 2

This example provides a reflective polarizer film, which includes a reflective polarizer base material (polyethylene terephthalate) and a coating layer (5 μm thick) having protrusions on the surface, which are stacked;

the coating is prepared from the following raw materials in parts by weight:

the preparation raw materials are solvent-free.

The reflective polarizer film is prepared by the following method, and the method comprises the following steps:

stirring acrylic acid active monomers, acrylic resin, a photoinitiator, an organic silicon assistant and an antistatic agent at the rotation speed of 500rpm for 120min, mixing, filtering in a filter bag with the diameter of 0.5 mu m, coating on the surface of a reflective polarizer substrate, carrying out photocuring under the conditions that the ultraviolet dominant wavelength is 360nm and the energy is 400mj, and rolling by adopting a die with pits arranged on the surface to form a coating, thus obtaining the reflective polarizer film.

Wherein, the flow chart of the method is shown in figure 1, the structural diagram of the rolled mould is shown in figure 2, the surface of the mould is provided with random circular pits, the average diameter of the circular pits is 10 μm, RZ is 2 μm, the material of the surface of the mould is precision electroplating copper, the thickness of a copper layer is 260 μm, and the hardness of the copper is 200HB.

Example 3

This example provides a reflective polarizer film, which includes a reflective polarizer base material (polyethylene terephthalate) and a coating layer (6 μm thick) having protrusions on the surface, which are stacked;

the coating is prepared from the following raw materials in parts by weight:

the preparation raw materials are solvent-free.

The reflective polarizer film is prepared by the following method, and the method comprises the following steps:

stirring acrylic acid active monomers, acrylic resin, a photoinitiator, an organic silicon assistant and an antistatic agent at the rotating speed of 2000rpm for 30min, mixing, filtering in a filter bag with the diameter of 0.5 mu m, coating on the surface of a reflective polarizer substrate, carrying out photocuring under the conditions that the ultraviolet dominant wavelength is 450nm and the energy is 230mj, and rolling by adopting a die with pits arranged on the surface to form a coating, thus obtaining the reflective polarizer film.

Wherein, the flow chart of the method is shown in figure 1, the structural diagram of the rolled mould is shown in figure 2, the surface of the mould is provided with random circular pits, the average diameter of the circular pits is 20 μm, RZ is 4 μm, the material of the surface of the mould is precision electroplating copper, the thickness of the copper layer is 240 μm, and the copper hardness is 250HB.

Example 4

This example is different from example 1 in that the acrylic resin is polycarbonate acrylic resin, and the rest is the same as example 1.

Example 5

The difference between this example and example 1 is that the acrylic resin is epoxy acrylic resin, and the rest is the same as example 1.

Comparative example 1

The present comparative example provides a reflective polarizer film comprising a reflective polarizer base material (polyethylene terephthalate) and a coating layer (6 μm in thickness) which were laminated;

the coating is prepared from the following raw materials in parts by weight:

the reflective polarizer film is prepared by the following method, and the method comprises the following steps:

stirring acrylic resin, PMMA particles (with the average particle size of 2-10 microns), a solvent and an auxiliary agent at the rotation speed of 1000rpm for 80min, mixing, filtering in a filter bag with the particle size of 0.5 micron, coating on the surface of a base material of the reflective polarizer, and drying at 100 ℃ for 1.5min to form a coating, thereby obtaining the reflective polarizer film.

Performance test

The reflective polarizer films described in examples 1 to 5 and comparative example 1 were subjected to the following tests:

(1) The production speed is as follows: the machine displays the speed;

(2) Shielding property: observing the assembled whole machine;

(3) Finished product picture: checking the full view angle of the desk lamp;

(4) Refractive index: measuring a general method according to the refractive index of GB/T614-2021 chemical reagent;

(5) Shore D hardness: belonging to Shore hardness;

(6) Average haze: the test was conducted with a testing instrument NHD-5000 according to ISO 14782.

The test results are summarized in table 1.

TABLE 1

The data in table 1 are analyzed, and it can be seen that, in the present invention, the raw material for preparing the coating layer of the reflective polarizer film does not contain a solvent, such that the haze is high, the hardness is high, the finished picture is excellent, and the production cycle is shortened; in the invention, the haze of the reflective polarizer film is more than 70%, the refractive index is between 1.48 and 1.49, the Shore D hardness is between 65 and 70, the formed LCD device has excellent picture display, and the production speed is more than 20M/min.

In the invention, the Shore D hardness of the reflective polarizer film is between 65 and 70, and the formula of the embodiment is designed on the basis of the Shore D hardness of 68.

Analyzing comparative example 1 and example 1, comparative example 1 is inferior to example 1 in performance, has a large refractive index and a slow production speed, and proves that the reflective polarizer film of the present invention has better performance.

As can be seen from the analysis of examples 4-5 and example 1, the performance of examples 4-5 is inferior to that of example 1, and the performance of the reflective polarizer film formed by acrylic resin, preferably polyurethane acrylic resin and/or polyester acrylic resin, is better.

The applicant states that the present invention is illustrated in detail by the above examples, but the present invention is not limited to the above detailed methods, i.e. it is not meant that the present invention must rely on the above detailed methods for its implementation. It should be understood by those skilled in the art that any modification of the present invention, equivalent substitutions of the raw materials of the product of the present invention, addition of auxiliary components, selection of specific modes, etc., are within the scope and disclosure of the present invention.

Claims (10)

1. A reflective polarizer film is characterized in that the reflective polarizer comprises a reflective polarizer base material and a coating, wherein the reflective polarizer base material and the coating are arranged in a laminated mode;

the coating comprises the following raw materials in parts by weight:

the preparation raw materials are solvent-free.

2. The reflective polarizer film of claim 1 wherein the coating has a refractive index of 1.48 to 1.5;

preferably, the coating has a Shore D hardness of 65-70.

3. The reflective polarizer film according to claim 1 or 2, wherein the thickness of the reflective polarizer substrate is 50 to 70 μm;

preferably, the thickness of the coating is 1-10 μm.

4. The reflective polarizer film of any of claims 1 to 3 wherein the acrylic reactive monomer comprises any one of or a combination of at least two of o-phenylphenoxyethyl acrylate, ethoxylated phenol acrylate, 2-phenoxyethyl acrylate, isobornyl acrylate, acryloylmorpholine, tetrahydrofurfuryl acrylate, N-dimethylacrylamide, 1,6-hexanediol diacrylate, tripropylene glycol diacrylate, ethoxylated bisphenol A diacrylate, trimethylolpropane triacrylate, pentaerythritol tetraacrylate, or dipentaerythritol hexapentaacrylate.

5. The reflective polarizer film of any of claims 1 to 4 wherein the acrylic resin comprises any one of polyurethane acrylic, epoxy acrylic, polyester acrylic or polycarbonate acrylic or a combination of at least two thereof.

6. The reflective polarizer film according to any of claims 1 to 5, wherein the photoinitiator comprises any one or a combination of at least two of 1-hydroxycyclohexyl phenyl ketone, 2-methyl-1- (4-methylthiophenyl) -2-morpholinyl-1-propanone, 2,4,6-trimethylbenzoylphenylphosphonic acid ethyl ester, benzophenone, phenyl bis (2,4,6-trimethylbenzoyl) phosphine oxide, or 2-hydroxy-2-methyl propiophenone;

preferably, the adjuvant comprises a silicone adjuvant and/or an antistatic agent;

preferably, the antistatic agent comprises a modified polythiophene-type antistatic agent.

7. A method of manufacturing a reflective polarizer film according to any of claims 1 to 6, comprising the steps of:

mixing an acrylic active monomer, acrylic resin, a photoinitiator and an auxiliary agent, coating the mixture on the surface of a base material of the reflective polarizer, and curing to form a coating to obtain the reflective polarizer film.

8. The method of claim 7, wherein the means of mixing comprises stirring;

preferably, the rotation speed of the stirring is 500-2000rpm;

preferably, the stirring time is 30-120min;

preferably, the operation of filtration and purification is further included after the mixing;

preferably, the curing is performed while rolling by using a mold with pits arranged on the surface;

preferably, the curing comprises photocuring;

preferably, the ultraviolet dominant wavelength of the photocuring is 360-450nm;

preferably, the energy of the photocuring is > 200mj.

9. The method according to claim 7 or 8, characterized in that it comprises the steps of:

stirring acrylic acid active monomers, acrylic resin, a photoinitiator and an auxiliary agent at the rotating speed of 500-2000rpm for 30-120min, mixing, filtering, purifying, coating on the surface of a reflective polarizer substrate, carrying out photocuring under the conditions that the ultraviolet dominant wavelength is 360-450nm and the energy is more than 200mj, and rolling by adopting a die with pits arranged on the surface to form a coating, thus obtaining the reflective polarizer film.

10. An LCD device, characterized in that it comprises the reflective polarizer film of any of claims 1 to 6.

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