KR102248013B1 - Polyester matt film - Google Patents

Abstract

According to an embodiment of the present invention, a polyester mat film includes: a main layer comprising a polyester resin; a sub-layer formed on both sides of the main layer and comprising a polyester resin and first inorganic particles; and an easily adhesive layer formed on a surface of at least one sub-layer, and thus the present invention has excellent diffusivity and fairness, and has easily adhesion properties.

Description

Polyester matte film {POLYESTER MATT FILM}

The present invention relates to a polyester mat film, and more specifically, to a polyester mat film that is excellent in light diffusivity, excellent resin adhesion, and can be used as a substrate for optics.

Recently, as various displays have been developed and commercialized, indoor displays are becoming larger and thinner, and portable displays are becoming smaller and lighter. In such a display field, optical films with various functions are used to improve performance and reduce thickness at the same time.

Backlight units widely used in conventional liquid crystal display devices include a light source that determines luminance and chromaticity, such as a cold cathode fluorescent lamp (CCFL) or LED, a reflector to increase the efficiency of light generated from the light source, and a linear light received from the reflector. It is composed of a light guide plate for making the entire image display surface in the form of a surface light source, a diffusion sheet for condensing and diffusing the surface light source received from the light guide plate, and a prism sheet for increasing luminance by condensing light by converting and emitting photometric light into frontal light. In addition, in order to reduce the cost and/or reduce the thickness of such a display device, development of various composite sheets in which functions implemented in each of a reflector, a light guide plate, a diffusion sheet, and a prism sheet are selectively bundled and combined are being developed.

Among them, the prism composite sheet disperses a light diffusing agent such as resin beads separately on the back surface of the prism processing surface or on the bottom surface in the form of a multi-layered sheet (the surface close to the light source) to give a diffusion function to the existing prism function. It is manufactured by applying a diffusion layer or by forming a plurality of irregularities on the surface through fine embossing during sheet forming.

As such a prism composite sheet, Korean Utility Model Publication No. 20-2004-0018027 proposes a method for a prism sheet that gives a diffusion function by dispersing and mixing a thermosetting resin including spherical beads for a diffusion function on the upper surface of the prism processing. In addition, Korean Patent Laid-Open Publication No. 10-2005-0044665 proposes a method for a multilayer prism sheet stacked by twisting the axis of an embossed prism sheet, but the form suggested in the above patent is for implementing a diffusion function and a prism function. Beads and pattern processing, etc., are exposed during the process or exposed to the outermost edge during assembly, which may cause defects due to scratches and cracks, and there is a problem that affects product reliability when used for a long time.

Republic of Korea Public Utility Model Publication No. 20-2004-0018027 Republic of Taiwan Patent Publication No. 10-2005-0044665

The present invention has been devised to solve the above problems and meet conventional requirements, and an object of the present invention is excellent in diffusivity in a multilayer composite prism sheet, and remarkably reduces the defect rate due to external influences such as scratches and cracks. It is intended to provide a polyester matte film that can be reduced to a minimum and at the same time has easy-adhesion properties and can improve resin adhesion in subsequent processes such as prism processing.

The above and other objects and advantages of the present invention will become apparent from the following description of preferred embodiments.

The above object is a poly comprising a main layer comprising a polyester resin, a sub-layer comprising a polyester resin and a first inorganic particle, and an easily-adhesive layer located on at least one surface of the sub-layer, located on both sides of the main layer It is achieved by an ester matte film.

Preferably, the polyester matte film satisfies the following equation (1).

(Equation 1)

0.3 ≤ HZ / TT ≤ 2.0

Here, TT is the battle transition of the polyester matte film, and HZ is the haze of the polyester matte film.

Preferably, the average particle diameter (d50) of the first inorganic particles may be 1 to 10 μm.

Preferably, the main layer may further include second inorganic particles, and the average particle diameter (d50) of the second inorganic particles may be 1 to 20 μm.

Preferably, the content of the first inorganic particles may be equal to or greater than the content of the second inorganic particles.

Preferably, the sub-layer may include 0.5 to 10 parts by weight of the first inorganic particles based on 100 parts by weight of the polyester resin.

Preferably, the main layer may include 10 parts by weight or less of the second inorganic particles based on 100 parts by weight of the polyester resin.

Preferably, the first inorganic particles and the second inorganic particles may include at least one or more of metal compounds such as silica, titanium dioxide, barium sulfate, calcium carbonate, talc, and mica.

Preferably, the easily adhesive layer may include at least one of acrylic resin, urethane resin, Co-PET resin, and silicone resin, and more preferably acrylic resin, urethane resin, Co-PET resin, and silicone resin. It may contain at least one resin, a tin catalyst, an anionic surfactant, colloidal silica particles, and a pH adjuster.

Preferably, the coating thickness after drying of the easily adhesive layer may be 0.05 to 3.00 μm.

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Preferably, the adhesion between the sub-layer and the easily-adhesive layer is 90% or more, and the high-temperature, high-humidity adhesion between the sub-layer and the easily-adhesive layer may be 70% or more after being left for 96 hours at 65° C. and 95% humidity.

Preferably, the two-dimensional surface roughness (Ra) value of the polyester mat film may be 0.05 to 2.00 μm.

Preferably, the polyester matte film may be used for prism sheet use.

As described above, according to the polyester mat according to an embodiment of the present invention, it is possible to implement a polyester mat film having excellent diffusivity and fairness and excellent easily adhesiveness.

That is, it is possible to provide a polyester matte film that has excellent light diffusivity without a separate diffusion plate, can prevent particle dropout and yellowing, and can significantly reduce cost.

However, the effects of the present invention are not limited to the above-mentioned effects, and other effects not mentioned will be clearly understood by those skilled in the art from the following description.

1 is a cross-sectional view of a polyester mat film according to an embodiment of the present invention.

With reference to the accompanying drawings, embodiments of the present invention will be described in detail so that those of ordinary skill in the art can easily implement the present invention. However, the present invention may be implemented in various different forms and is not limited to the embodiments described herein.

In the drawings, the thicknesses are enlarged in order to clearly express various layers and regions. Like reference numerals are attached to similar parts throughout the specification. When a part of a layer, film, region, plate, etc. is said to be "on" another part, this includes not only the case where the other part is "directly above", but also the case where there is another part in the middle. Conversely, when one part is "directly above" another part, it means that there is no other part in the middle.

Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. In case of conflict, the present specification, including definitions, will control. Also, although methods and materials similar or equivalent to those described herein may be used in the practice or testing of the present invention, suitable methods and materials are described herein.

First, a polyester mat film according to an embodiment of the present invention will be described in detail with reference to FIG. 1, which is a cross-sectional view of a polyester mat film according to an embodiment of the present invention.

Referring to FIG. 1, the polyester mat film according to an embodiment of the present invention includes a main layer 10, a sub-layer 20 positioned on both sides of the main layer 10, and at least one sub-layer 20. It includes an easily adhesive layer 30 formed on the surface of. That is, the sub-layer 20 is located on both sides of the main layer 10, and the easily adhesive layer 30 may be located on both sides of the sub-layer 20, or may be located on either side. In this case, when the sub-layer 20 is divided into an A layer and the main layer 10 into a B layer, it may be expressed in a stacked form of A/B/A.

First, the main layer 10 includes a polyester resin. In addition, the main layer 10 may further include second inorganic particles to control transmittance.

The polyester included in the main layer 20 may be formed by polymerizing dicarboxylic acid and glycol.

Here, the dicarboxylic acid is terephthalic acid, naphthalenedicarboxylic acid, isophthalic acid, diphenyl carboxylic acid, diphenyl sulfone dicarboxylic acid, diphenoxyethane dicarboxylic acid, 5-sodium sulfone dicarboxylic acid, phthalic acid, etc. Aromatic dicarboxylic acid, aliphatic dicarboxylic acid such as hydroxy acid, succinic acid, adipic acid, sebacic acid, dimasic acid, maleic acid, fumaric acid, and alicyclic dicarboxylic acid such as cyclohexane dicarboxylic acid, and paraoxybenzoic acid. It may contain oxycarboxylic acid and the like.

In addition, glycols are aliphatic glycols such as ethylene glycol, propanediol, butanediol, pentanediol, hexanediol, and neopentine glycol, polyoxyalkylene glycols such as diethylene glycol, polyethylene glycol, and polypropylene glycol, cyclohexane dimethanol, etc. And aromatic glycols such as alicyclic glycols of bisphenol A or bisphenol S.

The main layer 20 may include polyester formed by polymerizing ethylene glycol as a glycol, preferably using terephthalic acid or naphthalenedicarboxylic acid as a dicarboxylic acid, but is not limited thereto and formed through various combinations. It may include polyester.

The second inorganic particles of the main layer 10 may include at least one of silica, titanium dioxide, barium sulfate, calcium carbonate, talc, and mica. In this case, in consideration of fairness and diffusivity, silica and calcium carbonate particles are desirable.

Next, the sub-layer 20 may include a polyester resin and a first inorganic particle. The polyester included in the sub-layer 20 is the same as the polyester included in the main layer 10 described above, and redundant descriptions will be omitted.

The first inorganic particles of the sub-layer 20 may include at least one of silica, titanium dioxide, barium sulfate, calcium carbonate, talc, and mica, and silica and calcium carbonate particles are preferable in consideration of fairness and diffusivity. .

In this case, the first inorganic particles of the sub-layer 20 are preferably the same as the second inorganic particles included in the main layer 10 described above. However, depending on the case, the first inorganic particles and the second inorganic particles may be selected and used in different types.

It is preferable that the average particle diameter (D50) of the first inorganic particles is 1 μm to 10 μm. When the average particle diameter (D50) of the first inorganic particles is less than 1 μm, it is difficult to implement sufficient diffusivity in the film, and when the average particle diameter (D50) of the first inorganic particles is more than 10 μm, the particles may be removed from the sub-layer 20.

In addition, the average particle diameter (D50) of the second inorganic particles is preferably 1 µm to 20 µm. When the average particle diameter (D50) of the second inorganic particles is less than 1 μm, it is difficult to implement sufficient diffusibility in the film like the first inorganic particles, and when the average particle diameter (D50) of the second inorganic particles is more than 20 μm, it may cause poor fairness due to an increase in filter pressure.

The sub-layer 20 may include 0.5 parts by weight to 10 parts by weight of the first inorganic particles based on 100 parts by weight of the polyester resin. When the content of the first inorganic particles is less than 0.5 parts by weight, it is difficult to implement sufficient diffusivity in the film, and when the content of the first inorganic particles is more than 10 parts by weight, it is difficult to secure fairness due to fracture during the stretching process of the film.

In addition, the main layer 10 may contain 10 parts by weight or less of the second inorganic particles based on 100 parts by weight of the polyester resin. When the content of the second inorganic particles exceeds 10 parts by weight, it is difficult to secure fairness due to fracture during the stretching process of the film. However, in the case of the second inorganic particles of the main layer 10, depending on the composition of the composite prism sheet and the structure of the prism acid, if sufficient diffusibility is given in the sheet, it is included at a minimum to reduce manufacturing cost and improve product yield, or at all. May not be included.

That is, in the A/B/A multilayer structure when manufacturing the polyester mat film according to an embodiment of the present invention, the B layer, which is the main layer, may be a polyester film that does not substantially contain inorganic particles, and costs are reduced. It may have a structure that contains a minimum of inorganic particles (second inorganic particles) through the use of regeneration chips for the purpose.

In one embodiment, the content of the first inorganic particles may be equal to or greater than the content of the second inorganic particles. That is, it is preferable that the content of the first inorganic particles in the sub-layer is equal to or greater than the content of the second inorganic particles in the main layer in terms of physical properties, processability, and manufacturing cost of the film.

Next, the easy-to-adhesive layer 30 is a layer coated on the sub-layer 20 in order to compensate for the decrease in adhesive strength with the prism coating resin due to the high roughness of the polyester mat film.

The easily adhesive layer 30 may include a base resin, a tin catalyst, an anionic surfactant, colloidal silica particles, and a pH adjuster.

At this time, the base resin of the easily adhesive layer 30 preferably includes at least one of acrylic resin, urethane resin, Co-PET resin, and silicone resin.

In addition, it is preferable that the easily adhesive layer 30 has a coating thickness of 0.05 to 3.00 μm after drying. When the coating thickness is less than 0.05 μm, it is difficult to achieve sufficient easy-adhesion, and when the thickness is more than 3 μm, the coating property decreases, which may cause coating defects on the appearance of the product.

In addition, in one embodiment, the adhesion between the sub-layer 20 and the easily adhesive layer 30 is preferably 90% or more, and the high temperature and high humidity adhesion is preferably 70% or more. At this time, when the adhesion between the sub-layer 20 and the easily-adhesive layer 30 is less than 90% or the high-temperature and high-humidity adhesion is less than 70%, the adhesion between the sub-layer 20 and the easily-adhesive layer 30 decreases. (20) may be peeled off from the easily adhesive layer (30).

The adhesion between the sub-layer 20 and the easily-adhesive layer 30 is, after drying by applying a cellulose-based adhesive test sample to the easily-adhesive layer, cutting the easily-adhesive layer using a cross cutter, and then attaching the cellophane tape vertically. It is calculated through the ratio of the area remaining in the adhesive layer when peeled off. In addition, the high-temperature, high-humidity adhesion is calculated by testing the same adhesion as the above method after leaving it for 96 hours at 65°C and 95% humidity.

In addition, the polyester matte film according to an embodiment of the present invention satisfies the following Equation 1 when the battle transition is TT and the haze is HZ.

(Equation 1)

0.3 ≤ HZ / TT ≤ 2.0

Equation 1 is a formula for the relationship between the transmittance required for UV curing of the prism resin and securing the brightness of the prism sheet and a specific range of haze values for diffusion of light generated from the light source, and the value of Equation 1 is If it is less than 0.3, there is a problem that it is difficult to sufficiently implement the diffusion function of the light source to be provided by the present invention due to a low haze value. In addition, if the value of Equation 1 exceeds 2.0, the film due to the low battle transient value of the film There is a problem that the prism resin cannot be cured by blocking the UV light source irradiated from the back side of the prism sheet, and sufficient luminance cannot be secured from the prism sheet.

In addition, the two-dimensional surface roughness (Ra) value of the polyester mat film of the present invention is preferably 0.05 to 2.0 µm, more preferably 0.1 to 1.0 µm. When the Ra value is less than 0.05 μm, it is difficult to implement sufficient diffusibility in the film, and when the Ra value is more than 2.0 μm, there is a problem of occurrence of defects due to particle dropout.

According to the present invention described above, it is possible to provide a polyester matte film that has excellent light diffusibility without a separate diffusion plate, can prevent particle dropout and yellowing, and can significantly reduce cost.

Hereinafter, the configuration of the present invention and effects thereof will be described in more detail through examples and comparative examples. However, the present examples are for explaining the present invention in more detail, and the scope of the present invention is not limited to these examples.

[Example]

[Production Example 1] Preparation of a polyester masterbatch containing the first inorganic particles

Manufacturing Example 1-1

Inorganic particles by blending 85% by weight of polyester resin and 15% by weight of silica with an average particle diameter of 4.0㎛ by using a twin screw type extruder under conditions of 220~280℃, screw rotation speed of 100rpm, and discharge amount of 20kg/hr. To prepare a polyester masterbatch containing.

Preparation Example 1-2

Inorganic particles by blending 85% by weight of polyester resin and 15% by weight of silica with an average particle diameter of 2.0㎛ by using a twin screw type extruder under conditions of 220~280℃, screw rotation speed of 100rpm and discharge amount of 20kg/hr. To prepare a polyester masterbatch containing.

Manufacturing Example 1-3

Inorganic particles by blending 85% by weight of polyester resin and 15% by weight of silica having an average particle diameter of 10.0㎛ by using a twin screw type extruder under conditions of 220~280℃, screw rotation speed of 100rpm, and discharge amount of 20kg/hr. To prepare a polyester masterbatch containing.

Manufacturing Example 1-4

Inorganic particles by blending 85% by weight of polyester resin and 15% by weight of silica with an average particle diameter of 0.08㎛ by using a twin screw type extruder under conditions of 220~280℃, screw rotation speed of 100rpm, and discharge amount of 20kg/hr. To prepare a polyester masterbatch containing.

Manufacturing Example 1-5

Inorganic particles by blending 85% by weight of polyester resin and 15% by weight of silica with an average particle diameter of 12.0㎛ by using a twin screw type extruder under the conditions of 220~280℃, screw rotation speed of 100rpm, and discharge amount of 20kg/hr. To prepare a polyester masterbatch containing.

[Preparation Example 2] Preparation of easily adhesive composition

Manufacturing Example 2-1

Heat-reactive water-soluble urethane resin (solid content 23% by weight) 100g and tin catalyst aqueous dispersion (solid content 10% by weight) 5g and water 724g are mixed, anionic surfactant aqueous dispersion (solid content 10% by weight) 10g, colloidal silica An easily-adhesive composition was prepared after dispersing by adding 1 g of an aqueous dispersion of particles (70% by weight of solid content) and 160 g of an aqueous solution of pH adjusting agent (sodium hydrogen carbonate) (6.25% by weight of solid content).

Manufacturing Example 2-2

Copolymerized polyester resin (solid content 25% by weight) 100g and oxazoline curing agent (solid content 40% by weight) 30g and water 859g are mixed, anionic surfactant aqueous dispersion (solid content 10% by weight) 10g, colloidal silica aqueous dispersion (Solid content 70% by weight) 1g was added and dispersed to prepare an easily-adhesive composition.

[Example 1]

The master batch prepared according to Preparation Example 1-1 and polyethylene terephthalate chips were mixed in a weight ratio of 20:80 to prepare a composition of a sub-layer and a main layer.

After drying, the sub-layer composition and the main layer composition are melted at 280°C, co-extruded from a T-die in a laminated form of sub-layer/main layer/sub-layer, and then quenched by a casting method or a calendar method to unstretched sheet Was obtained.

In this case, the thickness ratio of the sub-layer: the main layer: the sub-layer was 1:10:1.

Thereafter, it was stretched 3.5 times in the longitudinal direction at a temperature of 120°C, applied the easily-adhesive composition prepared in Preparation Example 2-1 using a Mayer bar, and then stretched 3.5 times in the transverse direction at a temperature of 120°C, and then 250 Heat treatment for 10 seconds at a temperature of ℃ to prepare a 75㎛-thick polyester matte film. At this time, the thickness of the easily adhesive layer was set to 0.2 µm.

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[Example 3]

Polyester mat film through the same process as in Example 1, except that the master batch prepared according to Preparation Example 1-1 and the polyethylene terephthalate chip were mixed at a weight ratio of 6.7:93.3 and used as the composition of the sub-layer and the main layer. Was prepared.

[Example 4]

Polyester mat film through the same process as in Example 1, except that the master batch prepared according to Preparation Example 1-2 and the polyethylene terephthalate chip were mixed in a weight ratio of 20:80 and used as the composition of the sub-layer and the main layer. Was prepared.

[Example 5]

A polyester mat film was manufactured through the same process as in Example 1, except that the composition prepared according to Preparation Example 2-2 was used for the easily-adhesive layer.

[Example 6]

The master batch prepared according to Preparation Example 1-1 and polyethylene terephthalate chips were mixed in a weight ratio of 60:40 to be used as a sub-layer composition, and the master batch prepared according to Preparation Example 1-1 and polyethylene terephthalate chips were 20 A polyester matte film was prepared through the same process as in Example 1, except that it was mixed in an 80 weight ratio and used as the composition of the main layer.

[Example 7]

Polyester mat film through the same process as in Example 1, except that the master batch prepared according to Preparation Example 1-3 and the polyethylene terephthalate chip were mixed in a weight ratio of 20:80 and used as the composition of the sub-layer and the main layer. Was prepared.

[Example 8]

A polyester mat film was manufactured through the same process as in Example 1, except that the thickness of the easily adhesive layer was set to 0.05 μm.

[Example 9]

A polyester mat film was manufactured through the same process as in Example 1, except that the thickness of the easily adhesive layer was set to 3 μm.

[Comparative Example 1]

A polyester matt film was manufactured through the same process as in Example 1, except that the easily adhesive coating composition was not coated.

[Comparative Example 2]

Polyester mat film through the same process as in Example 1, except that the master batch prepared according to Preparation Example 1-4 and the polyethylene terephthalate chip were mixed at a weight ratio of 20:80 and used as the composition of the sub-layer and the main layer. Was prepared.

[Comparative Example 3]

Polyester mat film through the same process as in Example 1, except that the master batch prepared according to Preparation Example 1-5 and the polyethylene terephthalate chip were mixed at a weight ratio of 20:80 and used as the composition of the sub-layer and the main layer. Was prepared.

[Comparative Example 4]

Polyester mat film through the same process as in Example 1, except that the master batch prepared according to Preparation Example 1-1 and the polyethylene terephthalate chip were mixed in a weight ratio of 0.67: 99.33 as the composition of the sub-layer and the main layer. Was prepared.

[Comparative Example 5]

A polyester mat film was manufactured through the same process as in Example 1, except that the master batch prepared according to Preparation Example 1-1 was used as a composition of a sub-layer and a main layer alone.

[Comparative Example 6]

Polyester mat film through the same process as in Example 1, except that the master batch prepared according to Preparation Example 1-1 and the polyethylene terephthalate chip were mixed at a weight ratio of 70:30 and used as the composition of the sub-layer and the main layer. Was prepared.

[Comparative Example 7]

A polyester mat film was manufactured through the same process as in Example 1, except that the thickness of the easily adhesive layer was set to 0.03 μm.

[Comparative Example 8]

A polyester mat film was manufactured through the same process as in Example 1, except that the thickness of the easily adhesive layer was set to 3.5 μm.

The following table shows the particle types, particle sizes, particle content, and resin types and coating thickness of the easily-adhesive layer in the sub-layer and main layer of the polyester matt film according to Examples 1, 3 to 9 and Comparative Examples 1 to 8 thus prepared. It is described in 1.

Item Sub layer Main floor Easy adhesive layer Particle type particle
size
(㎛) In the sub-floor
Particle content
(weight%) Particle type particle
size
(㎛) Inside the main floor
Particle content
(weight%) Resin type coating
thickness
(㎛) Example 1 SiO2 4.0 3 SiO2 4.0 3 urethane 0.2 Example 3 SiO2 4.0 One SiO2 4.0 One urethane 0.2 Example 4 SiO2 2.0 3 SiO2 2.0 3 urethane 0.2 Example 5 SiO2 4.0 3 SiO2 4.0 3 Co-PET 0.2 Example 6 SiO2 4.0 9 SiO2 4.0 3 urethane 0.2 Example 7 SiO2 10 3 SiO2 10 3 urethane 0.2 Example 8 SiO2 4.0 3 SiO2 4.0 3 urethane 0.05 Example 9 SiO2 4.0 3 SiO2 4.0 3 urethane 3 Comparative Example 1 SiO2 4.0 3 SiO2 4.0 3 - - Comparative Example 2 SiO2 0.08 3 SiO2 0.08 3 urethane 0.2 Comparative Example 3 SiO2 12.0 3 SiO2 12.0 3 urethane 0.2 Comparative Example 4 SiO2 4.0 0.1 SiO2 4.0 0.1 urethane 0.2 Comparative Example 5 SiO2 4.0 15 SiO2 4.0 15 urethane 0.2 Comparative Example 6 SiO2 4.0 10.5 SiO2 4.0 10.5 urethane 0.2 Comparative Example 7 SiO2 4.0 3 SiO2 4.0 3 urethane 0.03 Comparative Example 8 SiO2 4.0 3 SiO2 4.0 3 urethane 3.5

The physical properties of the polyester matt film prepared according to the above Examples and Comparative Examples were measured according to the following experimental examples, and the measured values are shown in Table 2 below.

[Experimental Example]

(1) Measurement of battle transients and haze

It was measured according to ASTM D1003 using COH-300A (haze meter). Combat transient and haze measurements were performed by measuring five polyester matte films according to Examples 1 to 9 and Comparative Examples 1 to 8, respectively, and then the average value excluding the maximum and minimum values was calculated as the battle transient and haze.

(2) Measurement of adhesion

A cellulose-based adhesive test sample was applied to the polyester matte film prepared in Examples and Comparative Examples on the surface coated with the easily adhesive layer using #4 wire bar, and dried at 150° C. for 30 seconds in a drying oven. Let it. Then, cut lines were made on the film coated with the primer layer with a cross cutter, and 2 mm×2 mm squares were placed in a 10×10 matrix. The cut line is made deep enough to pass through the adhesive layer and reach the base film. A cellophane tape (No. 405, made by NICHIBAN, width: 24 mm ² ) is attached to the film with a cut line, and the tape is rubbed with velvet to strongly adhere to the film. Then remove the tape vertically. The area of the primer layer remaining in the adhesive layer was visually observed, and adhesion was calculated through Equation 2 below to determine adhesion.

(Equation 2)

Adhesiveness (%) = (1-Area of the easily-adhesive layer removed / Total evaluation area (400㎜ ² ))×100%

(3) High-temperature, high-humidity adhesion measurement

It proceeded in the same manner as the adhesive measurement, but the measurement was carried out after leaving it for 96 hours at 65°C and 95% humidity.

(4) Measurement of average surface roughness

Using a contact type three-dimensional surface roughness meter (Mitutoyo, SV-3200), the film surface roughness was measured five times under the conditions of a cutoff of 0.08 mm and a measurement length of 10 mm, and the average value of the three times was measured excluding the maximum and minimum values.

(5) Measurement of film forming properties

Fabrication of unstretched sheet → 3.5 times stretching in MD direction → Coating → pre-drying, and then stretching 3.5 times in the TD direction using a biaxial stretching machine (manufactured by TOYOSEIKI) to evaluate the tearing of the film. The degree of tearing of the film was evaluated according to the following criteria.

○: No tearing occurs on the entire surface of the stretched film

△: Tear occurs at the edge of the stretched film (clip biting part during stretching)

X: Tear occurs over the entire surface of the stretched film, or stretching is impossible due to tearing

(6) particle dropout measurement

Thereby crimping the TESA 7475 tape were attached to the produced film, and passing twice the pressing roll of the pressure of 4kg / cm ^2. And after leaving at room temperature for 24 hours with a load of 5kg, peeling at a rate of 300mm/min using a peel force meter (ChemInstruments, AR-1000), and then 440 times using an optical microscope (OLYMPUS, MX50LT-1273MU). Was measured. The degree of particle detachment was evaluated according to the following criteria.

○: No particle dropout was observed on the entire surface of the observation site.

△: 1 to 2 particle dropouts are observed on the entire surface of the observation site

X: 3 or more particle dropouts are observed on the entire surface of the observation site.

(7) Light diffusion evaluation

After bonding the black acrylic plate to the back side of the prepared film, the three-wavelength stand light was incident in the 60° direction of the polyester matte film to confirm the degree to which the shape of the stand light reflected from the regular reflection angle was clearly visible. For light diffusivity evaluation, it was evaluated according to the following criteria.

○: The outline of the stand light is distorted, making it difficult to check the border

△: The outline of the stand's light is slightly skewed, and the boundary line can be seen dimly

X: The outline of the stand light is clear, and the boundary line can be checked.

Battle
(%) Haze Adhesiveness
(%) High temperature and high humidity
Adhesiveness (%) Two dimensional surface
Illuminance (㎛) Film production
(Fairness) particle
leaving out ore
Diffusive coating
Exterior Example 1 65 88 100 100 0.51 ○ ○ ○ ○ Example 3 81 80 100 100 0.41 ○ ○ △ ○ Example 4 58 86 100 100 0.29 ○ ○ ○ ○ Example 5 64 89 98 83 0.50 ○ ○ ○ ○ Example 6 47 90 100 100 0.70 △ △ ○ ○ Example 7 71 89 100 100 1.65 △ △ ○ ○ Example 8 64 88 90 71 0.56 ○ ○ ○ ○ Example 9 65 88 100 100 0.43 ○ ○ ○ △ Comparative Example 1 67 88 0 0 0.53 ○ ○ ○ ○ Comparative Example 2 59 72 100 100 0.11 ○ ○ X ○ Comparative Example 3 76 90 100 100 1.82 X X ○ ○ Comparative Example 4 87 8 100 100 0.04 ○ ○ X ○ Comparative Example 5 14 92 100 97 0.88 X △ ○ ○ Comparative Example 6 24 91 100 99 0.75 X △ ○ ○ Comparative Example 7 64 88 88 68 0.56 ○ ○ ○ ○ Comparative Example 8 65 88 100 100 0.44 ○ ○ ○ X

According to the results of Table 2, as in Comparative Example 1, when there is no separate easily adhesive coating, it can be confirmed that the resin adhesion does not come out. This means that there is a fear that coating peeling may occur because there is no adhesive force between the polyester mat film and the resin when resin coating for prism acid formation, so it can be confirmed that the easily adhesive layer of the structure suggested in the present invention is absolutely necessary.

In addition, as in Comparative Example 2, when the particle diameter of the inorganic particles is small, it can be seen that sufficient diffusivity cannot be implemented due to a low haze value.

As in Comparative Example 3, when the particle diameter of the inorganic particles is large, the diffusibility is excellent, but the film forming property is poor, and there is a fear of rupture during stretching of the film, and there is also a fear of particle dropout due to the large number of particles exposed to the outside of the film.

When the absolute content of inorganic particles is low as in Comparative Example 4, the value of Equation 1 is 0.09, and sufficient diffusibility cannot be implemented due to the low haze value, and when the absolute content of inorganic particles is high as in Comparative Examples 5 and 6 Due to poor film forming properties, there is a risk of breakage during stretching of the film.

When the thickness of the easily-adhesive layer is too thin as in Comparative Example 7, the required easily-adhesiveness cannot be realized, and when the thickness of the easily-adhesive layer is too thick as in Comparative Example 8, the coating property decreases, causing coating defects on the product appearance. .

On the other hand, in the case of the polyester mat film according to Example 1 and Examples 3 to 9 of the present invention, a polyester mat film having excellent film forming properties and light diffusing property, and excellent adhesion to the prism resin can be obtained. Can be confirmed. In the case of Example 3, the light diffusivity is somewhat inferior, but it can be seen that it has a range of diffusivity that can be sufficiently applied when securing additional diffusivity through structural change in the composite prism sheet.

Although the preferred embodiments of the present invention have been described in detail above, the scope of the present invention is not limited thereto, and various modifications and improvements of those skilled in the art using the basic concept of the present invention defined in the following claims are also present. It belongs to the scope of rights of

10: main floor 20: sub floor
30: easy adhesive layer

Claims (17)

A main layer comprising a polyester resin;
A sub-layer comprising 0.5 to 10 parts by weight of first inorganic particles located on both sides of the main layer and having an average particle diameter (d50) of 1 to 10 μm with respect to 100 parts by weight of the polyester resin; And
An easily-adhesive layer positioned on at least one surface of the sub-layer;
Including,
The main layer further includes a second inorganic particle,
Satisfying Equation 1 below,
(Equation 1)
0.3 ≤ HZ / TT ≤ 2.0
Here, TT is the battle transition of the polyester matte film, HZ is the haze of the polyester matte film, polyester matte film. delete delete In claim 1,
The first inorganic particles include at least one or more of metal compounds such as silica, titanium dioxide, barium sulfate, calcium carbonate, talc, mica, etc., polyester matt film. delete In claim 1,
The content of the first inorganic particles is the same as or more than the content of the second inorganic particles, polyester matte film. In claim 1,
The average particle diameter (d50) of the second inorganic particles is 1 to 20㎛, polyester matte film. In claim 1,
The main layer includes 10 parts by weight or less of the second inorganic particles based on 100 parts by weight of the polyester resin, a polyester matte film. In claim 1,
The second inorganic particles include at least one or more of metal compounds such as silica, titanium dioxide, barium sulfate, calcium carbonate, talc, mica, etc., polyester matt film. In claim 1,
The easily adhesive layer comprises at least any one of acrylic resin, urethane resin, Co-PET resin, and silicone resin, polyester mat film. In claim 1,
The easily adhesive layer includes at least one of acrylic resin, urethane resin, Co-PET resin, and silicone resin and a tin-based catalyst, anionic surfactant, colloidal silica particles, and a pH adjuster, a polyester mat film. In claim 1,
After drying the easily adhesive layer, the coating thickness is 0.05 to 3.00 ㎛, polyester matte film. delete In claim 1,
The adhesive between the sub-layer and the adhesive layer is 90% or more, polyester matte film. In claim 1,
After leaving for 96 hours at 65° C. and 95% humidity, the high-temperature, high-humidity adhesion between the sub-layer and the easily-adhesive layer is 70% or more, a polyester matte film. In claim 1,
The two-dimensional surface roughness (Ra) value of the polyester matte film is 0.05 to 2.00㎛, polyester matte film. The method according to any one of claims 1, 4, 6 to 12, and 14 to 16,
The polyester matte film is used for prism sheet use, polyester matte film.

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