KR102391162B1 - Film for bonding and light transmitting layered product comprising of the same - Google Patents

Abstract

An embodiment relates to a bonding film, a light-transmitting laminate including the same, and a high refractive layer comprising a thiourethane-based repeating unit, wherein the high refractive layer has a refractive index of 1.5 or more, and a modulus of 300 kgf/mm ² or less for bonding films and the like are disclosed. Such a bonding film, etc. can suppress the occurrence of defects in the winding process, etc. without generating a double image during projection of the HUD image.

Description

Film for bonding and light-transmitting laminate including same {FILM FOR BONDING AND LIGHT TRANSMITTING LAYERED PRODUCT COMPRISING OF THE SAME}

Embodiments relate to a bonding film, a light-transmitting laminate including the same, and the like.

Laminating films are used as interlayers of laminated glass (safety glass) or light-transmitting laminates. Laminated glass is mainly used for windows of buildings, exterior materials, and automobile window glass, etc. It is possible to secure stability to minimize damage or injury.

Recently, the case of mounting a front display device (HUD, Head Up Display) is increasing in automobiles. Specifically, when an image is projected on a windshield with a projector in the dashboard area or roof area, the manner in which the projected image is perceived by the driver is applied. Such a front display device allows the driver to simultaneously obtain important data such as current driving information, navigation information, and warning messages while keeping an eye on the road ahead, thereby significantly contributing to driving convenience and traffic safety.

As the front display device projects the projector image onto the windshield, the image is reflected on both surfaces of the windshield (the inner surface and the outer surface), and the driver not only wants the desired primary image, but also a second image (ghost image) with a weaker intensity. ) has a basic problem of being late together. One method applied to solve this problem is to apply a wedge-shaped vertical cross-section as an intermediate layer between the glasses.

The above-mentioned background art is technical information that the inventor possessed for the derivation of the present invention or acquired in the process of derivation of the present invention, and cannot necessarily be said to be a known technique disclosed to the general public prior to the filing of the present invention.

Domestic Patent Publication No. 10-2018-0015746 Domestic Patent Publication No. 10-2014-0029298 Domestic Registered Patent No. 10-0222194

An object of the embodiment is to provide a film for bonding, which has a function of preventing the formation of a double image when projecting a HUD image, and is easy to wind up and post-process, and a light-transmitting laminate including the same.

The bonding film according to an embodiment of the present specification includes a high refractive index layer including a thiourethane-based repeating unit.

The high refractive layer has a refractive index of 1.5 or more, and a modulus of 300 kgf/mm ² or less.

The bonding film may further include a base layer positioned on one surface of the high refractive index layer.

A value obtained by subtracting the refractive index value of the base layer from the refractive index value of the high refractive index layer may be 0.02 or more.

A value obtained by subtracting the modulus value of the base layer from the modulus value of the high refractive index layer may be 0.1 to 299 kgf/mm ² .

The bonding force between the base layer and the high refractive index layer may be 8 kgf/cm or more.

The high refractive index layer may contain 15 to 35% by weight of sulfur atoms.

The high refractive index layer may include a repeating unit including an alkanediyl having 5 to 9 carbon atoms.

The high refractive layer may include a heterocycloalkanediyl-based repeating unit represented by Formula 1 below and a linear alkanediyl-based repeating unit represented by Formula 2 below.

[Formula 1]

[Formula 2]

In Formula 1, R1 is -O- or -S-, and X is a group including a C3-10 heterocycloalkanediyl repeating unit containing 1-5 sulfur atoms,

In Formula 2, R2 is -O- or -S-, and n2 is an integer of 4 to 10.

The heterocycloalkanediyl-based repeating unit may include a repeating unit represented by Formula 3 below.

[Formula 3]

In Formula 3, R1 is -O- or -S-, and n11 and n12 are each independently an integer of 0 to 3.

The bonding film may include a HUD region having a function of preventing double image formation.

The high refractive index layer may include one surface and the other surface facing the one surface.

In the HUD area, at least a portion of the one surface and the other surface may not be parallel to each other.

The high refractive layer may include first and third points positioned on the one surface and second and fourth points positioned on the other surface in the HUD region.

The third point may be located 1 cm apart from the first point in the width direction of the bonding film.

The first point and the second point are located on the same line in the thickness direction of the bonding film.

The third point and the fourth point are located on the same line in the thickness direction of the bonding film.

An extension line passing through the first point and the third point is a first line, and an extension line passing through the second point and the fourth point is a second line.

An angle between the first line and the second line at the contact point between the first line and the second line is W, and the W is a constant or non-constant value in the HUD area, and may be 0.01 to 1.2 degrees.

The bonding film according to another embodiment of the present specification includes a high refractive index layer, and the high refractive index layer has a plasticizer absorption amount of less than 3% of the weight of the high refractive index layer.

The high refractive index layer includes a thiourethane-based repeating unit.

The high refractive index layer may have a refractive index of 1.5 or more.

The bonding film may further include a base layer positioned on one surface of the high refractive index layer and including a plasticizer.

Specific descriptions of the high refractive index layer, the base layer, the thiourethane-based repeating unit, the bonding film, etc. will be omitted since they overlap with the above.

A light-transmitting laminate according to another embodiment of the present specification includes a first light-transmitting layer; The bonding film described above located on one surface of the first light-transmitting layer; and a second light-transmitting layer positioned on the bonding film.

The bonding film of the embodiment, a light-transmitting laminate including the same, and the like have a function of preventing the formation of a double image when projecting an image on a windshield by controlling the refractive index and modulus of the high refractive layer, and winding and post-processing are easy.

1 is a conceptual diagram illustrating a bonding film according to an embodiment of the present specification.
Figure 2 is a conceptual diagram illustrating a bonding film according to another embodiment of the present specification.
It is a conceptual diagram explaining the HUD area|region and W value of the film for bonding.
4 to 6 are conceptual views illustrating a bonding film including a HUD region according to another embodiment of the present specification.

Hereinafter, the embodiments will be described in detail so that those of ordinary skill in the art can easily carry out the embodiments. However, the embodiment may be implemented in various different forms and is not limited to the embodiment described herein.

As used herein, the terms "about," "substantially," and the like, are used in a sense at or close to the numerical value when the manufacturing and material tolerances inherent in the stated meaning are presented, and to aid understanding of embodiments. It is used to prevent an unconscionable infringer from using the mentioned disclosure in an unreasonable way.

Throughout this specification, the term "combination of these" included in the expression of the Markush form means one or more mixtures or combinations selected from the group consisting of the components described in the expression of the Markush form, and the components It is meant to include one or more selected from the group consisting of.

Throughout this specification, reference to “A and/or B” means “A, B, or A and B”.

Throughout this specification, terms such as “first”, “second” or “A” and “B” are used to distinguish the same terms from each other unless otherwise specified.

In this specification, the meaning that B is located on A means that B is located on A or B is located on A while another layer is located in between, and B is located in contact with the surface of A It is not construed as being limited to

In the present specification, unless otherwise specified, the expression “a” is interpreted as meaning including “a” or “plural” as interpreted in context.

In the present specification, a polygon refers to a two-dimensional figure having three or more sides, and includes a triangle, a rectangle, a pentagon, a hexagon, etc., and includes a curved shape such as a circle, an ellipse, etc. having infinite sides in all or part of the polygon also includes doing

In this specification, evaluation of the amount of hydroxyl groups measured and evaluated the amount of ethylene groups to which the hydroxyl groups of the said polyvinyl acetal resin couple|bonded with the method based on JISK6728.

Unless otherwise specified herein, alkanediyl is a divalent atomic group obtained by subtracting two hydrogen atoms from an alkane, and may be represented by the general formula -C _n H _2n -.

Unless otherwise specified herein, an alkenediyl is a divalent atomic group obtained by subtracting two hydrogen atoms from an alkene, and may be represented by the general formula -C _n H _2n-2 -.

Unless otherwise specified herein, an alkynediyl is a divalent atomic group obtained by subtracting two hydrogen atoms from an alkyne, and may be represented by the general formula -C _n H _2n-4 - and the like.

In the present specification, room temperature means 20 to 25 °C.

In the present specification, the refractive index means a value measured by setting the measurement wavelength to D line (589.29 nm) and setting the measurement temperature to 20 °C.

The bonding film to which the HUD (Head Up Display) system can be applied is applied to have a Ÿ‡ paper-shaped cross section as a whole by placing a thickness deviation in the width direction to prevent the formation of a double image when projecting an image. In this case, inconvenience may be induced in the winding process and the post process according to the thickness deviation in the width direction.

The inventors have confirmed that, when two or more layers having different refractive indices are stacked, it is possible to reduce the thickness deviation in the width direction or have a function of preventing the formation of a double image even if there is substantially no deviation.

In addition, the inventors have found that if the difference in flexibility between the stacked layers is not controlled, there may be a problem in that irregularities occur in the rolled roll during the winding process. In addition, it was also confirmed that delamination may occur due to insufficient interfacial adhesion between both layers stacked adjacently, which may lead to optical defects.

Accordingly, the inventors of the embodiments applied a high refractive index layer with a controlled refractive index to prevent the formation of a double image when applying the HUD system, reduce the thickness deviation in the width direction of the film, and control the modulus of the high refractive index layer to prevent unevenness from occurring in the bonding film Or, it was confirmed that the delamination phenomenon can be substantially suppressed, and the winding operation can be facilitated, and embodiments such as a film including a high refractive index layer have been completed.

Hereinafter, the present embodiments will be described in more detail.

1 is a conceptual diagram of a bonding film according to an embodiment of the present specification, and FIG. 2 is a conceptual diagram of a bonding film according to another embodiment of the present specification. An embodiment will be described in detail below with reference to FIGS. 1 and 2 .

bonding film

In order to achieve the above object, the bonding film 100 according to an embodiment disclosed herein includes a high refractive index layer 10 including a thiourethane-based repeating unit to be described later.

The bonding film 100 may further include a base layer 20 on one surface of the high refractive index layer 10 .

The bonding film 100 may further include a base layer 20 on one surface and the other surface of the high refractive index layer 10 , respectively.

The bonding film 100 may have a cross-section in the form of Ÿ‡ paper in which some or all of the thickness is changed in the width direction (Dw).

The high refractive index layer 10 may have a cross-section in the form of Ÿ‡ paper in which some or all of the thickness is changed in the width direction Dw.

The bonding film 100 may have a substantially constant thickness in the width direction Dw.

Physical properties of the high refractive layer

In order to achieve the above object, the bonding film 100 according to an embodiment disclosed herein includes a high refractive index layer 10 including a thiourethane-based repeating unit.

The high refractive layer 10 has a refractive index of 1.5 or more, and a modulus of 300 kgf/mm ² or less.

The high refractive index layer 10 may have a refractive index of 1.5 or more. The high refractive layer 10 has high refractive properties and is included in the bonding film 100 to refract light incident from the HUD projector toward the surface of the high refractive layer 10 or the interface between the high refractive layer 10 and other layers. Or by reflecting it, the projector image is projected on the light-transmitting laminate including the bonding film 100, and the formation of a double image can be suppressed or mitigated.

The high refractive index layer 10 may have a refractive index of 1.5 or more. The high refractive index layer 10 may have a refractive index of 1.55 or more. The high refractive index layer 10 may have a refractive index of 1.60 or more. The high refractive index layer 10 may have a refractive index of 2.5 or less. The high refractive index layer 10 may have a refractive index of 2.3 or less. The high refractive index layer 10 may have a refractive index of 2.0 or less. In this case, the overall width direction (Dw) thickness change of the bonding film 100 can be reduced while substantially suppressing the occurrence of a double image on the light-transmitting laminate when applied as the high refractive layer 10 of the bonding film 100 there is.

The refractive index can be measured using Atago's Abbe refractometer, DR-M4 model.

The high refractive index layer 10 may have a modulus of 300 kgf/mm ² or less. The bonding film 100 including the high refractive index layer 10 may be wound in a roll form for ease of storage and transportation after manufacturing. When the high refractive index layer 10 has appropriate flexibility, excessive force is not applied to the bonding film 100 that is wound in the winding process, so it is possible to prevent damage to the bonding film 100 from occurring, and the roll-shaped After unwinding the bonding film 100 , a post-process such as a lamination process with a light-transmitting body may be smoothly performed. In addition, when the high refractive index layer 10 is applied and the additional base layer is applied with a heterogeneous resin, it is possible to improve these bonding strength and further improve the optical performance of the bonding film 100 .

The modulus of the high refractive index layer 10 may be 300 kgf/mm ² or less. The modulus of the high refractive index layer 10 may be 200 kgf/mm ² or less. The modulus of the high refractive index layer 10 may be 100 kgf/mm ² or less. The modulus of the high refractive index layer 10 may be 25 kgf/mm ² or more. The modulus of the high refractive index layer 10 may be 30 kgf/mm ² or more. The modulus of the high refractive index layer 10 may be 50 kgf/mm ² or more. In this case, it is possible to suppress the occurrence of defects in the film that may occur during winding of the bonding film 100 .

The modulus can be measured using Instron's UTM 5566A model.

The bonding film 100 according to an embodiment disclosed herein includes a high refractive index layer 10, and the high refractive index layer 10 may have a plasticizer absorption amount less than 3% of the weight of the high refractive index layer 10.

At least a portion of the base layer 20 and the high refractive index layer 10 may be in direct contact with each other.

The inventors have experimentally confirmed that the plasticizer of the base layer 20 can affect the high refractive index characteristics of the high refractive index layer 10 .

Specifically, the plasticizer is applied to adjust the flexibility of the base layer 20, but is not located only in the base layer 20, but is influenced by several factors such as externally applied temperature, pressure, and characteristics of the applied polyvinyl acetal. It has been experimentally confirmed that it can be moved between layers by receiving , and that the plasticizer can also occur between the base layer 20 and the high refractive index layer 10 .

When the plasticizer included in the base layer 20 moves to the high refractive index layer 10 , it may affect the refractive index of the high refractive index layer 10 itself. And, this may reduce the double-image formation suppression function of the bonding film 100 to which the high refractive index layer 10 is applied.

Therefore, the high refractive index layer 10 of the embodiment does not substantially absorb the plasticizer or it is preferable to apply a plasticizer with a small degree of absorption.

The high refractive index layer 10 may have a plasticizer absorption amount of less than about 3% by weight, about 2% by weight or less, or about 1% by weight or less of the weight of the high refractive index layer 10 . The high refractive index layer 10 may have a plasticizer absorption amount of 0% by weight or more, or 0.001% by weight or more of the weight of the high refractive index layer 10 . In this case, a decrease in the refractive index of the high refractive layer 10 due to the plasticizer absorption of the high refractive layer 10 can be substantially suppressed, and the double phase suppression effect can be maintained for a long period of time.

The plasticizer absorption test of the high refractive index layer 10 is performed by laminating the high refractive index layer 10 between two polyvinyl acetal films containing a plasticizer and leaving it at 50° C. for 4 weeks, as shown in Examples, before and after the high refractive index layer 10. The weight increase of the specimen is evaluated, and the weight increase is evaluated in % based on the weight of the high refractive index layer 10 before the test, and is expressed in weight %.

Physical properties of the base layer

A value obtained by subtracting the refractive index value of the base layer 20 from the refractive index value of the high refractive index layer 10 applied to the bonding film 100 according to an embodiment disclosed herein may be 0.02 or more. A value obtained by subtracting the refractive index value of the base layer 20 from the refractive index value of the high refractive index layer 10 may be 0.05 or more. A value obtained by subtracting the refractive index value of the base layer 20 from the refractive index value of the high refractive index layer 10 may be 0.3 or less. A value obtained by subtracting the refractive index value of the base layer 20 from the refractive index value of the high refractive index layer 10 may be 0.2 or less. In this case, the light passing through the base layer 20 due to the difference in refractive index between the base layer 20 and the high refractive layer 10 is reflected at the interface between the high refractive layer 10 and the adjacent layer and at the same time is refracted at an appropriate angle to transmit the light. When applied to a sieve, it helps to inhibit the formation of a double phase.

A value obtained by subtracting the modulus value of the base layer 20 from the modulus value of the high refractive index layer 10 may be 0.1 to 299 kgf/mm ² .

When the film 100 in which the base layer 20 and the high refractive index layer 10 are laminated is wound, the bonding film 100 is in the form of a roll. When the difference value between the modulus value of the high refractive layer 10 and the modulus value of the base layer 20 is adjusted, in the roll-type film, the generation of protrusions in the roll due to the stress difference between the two layers and the generation of wrinkles in the film due to the protrusions can be suppressed

A value obtained by subtracting the modulus value of the base layer 20 from the modulus value of the high refractive index layer 10 may be 0.1 to 299 kgf/mm ² . A value obtained by subtracting the modulus value of the base layer 20 from the modulus value of the high refractive index layer 10 may be 0.3 to 250 kgf/mm ² . A value obtained by subtracting the modulus value of the base layer 20 from the modulus value of the high refractive index layer 10 may be 0.5 to 200 kgf/mm ² . In this case, it is possible to prevent the occurrence of defects in the film that may occur during the winding process or the storage process of the wound film.

The bonding force between the base layer 20 and the high refractive index layer 10 may be 8 kgf/cm or more. The bonding force between the base layer 20 and the high refractive index layer 10 may be 12 kgf/cm or more. The bonding force between the base layer 20 and the high refractive index layer 10 may be 15 kgf/cm or more. The bonding force between the base layer 20 and the high refractive index layer 10 may be 50 kgf/cm or less. The bonding force between the base layer 20 and the high refractive index layer 10 may be 40 kgf/cm or less. The bonding force between the base layer 20 and the high refractive index layer 10 may be 30 kgf/cm or less. In this case, optical defects caused by the peeling phenomenon between the base layer 20 and the high refractive index layer 10 can be substantially suppressed.

The bonding strength between the base layer 20 and the high refractive index layer 10 can be measured through the 90° peel test described in ASTM D6862-11.

Layer structure and shape of the film

3 is a conceptual diagram illustrating the HUD region and W value of the bonding film 100 according to another embodiment of the present specification. 4 to 6 are conceptual views illustrating a bonding film including a HUD region according to another embodiment of the present specification. Hereinafter, embodiments will be described in detail with reference to FIGS. 3 to 6 .

The bonding film 100 includes a high refractive index layer 10 .

The bonding film 100 may further include a base layer 20 on one surface of the high refractive index layer 10 .

The bonding film 100 may further include a base layer 20 on one surface and the other surface of the high refractive index layer 10 , respectively.

The bonding film 100 may have a cross-section in the form of Ÿ‡ paper in which some or all of the thickness is changed in the width direction (Dw).

The bonding film 100 may have a substantially constant thickness in the width direction Dw.

The high refractive index layer 10 may have a Ÿ‡ paper-shaped cross-section in which some or all of the thickness is changed in the width direction Dw.

The bonding film 100 may include a HUD region (H) having a double image formation prevention function.

The HUD area H is an area to which light is irradiated by an external HUD projector.

In the HUD region (H), a double image called a ghost image is formed when light emitted from an external HUD projector is incident on the multi-layer structure of the light-transmitting laminate including the film 100, and is refracted and reflected in each layer. This is an area of relaxation or restraint.

The HUD region H may be formed on the entire film 100 .

The HUD region H may be formed in a portion of the film 100 .

The HUD region H may be formed to have a constant thickness in parallel with the width direction Dw of the film 100 .

The HUD region H may be formed to have a constant thickness at a position of about 6 cm or more from one edge of the film 100 in the width direction Dw.

The fact that the HUD region (H) is formed with a constant thickness in parallel to the width direction (Dw) of the film 100 means that the average thickness of the bonding film 100 in the HUD region (H) and the HUD region (H) at one point It means that the difference value between the measured thicknesses of the bonding film 100 is within a certain level. Specifically, when the average thickness of the bonding film 100 in the HUD region (H) is viewed as 100%, the average thickness of the bonding film 100 in the HUD region (H) and the HUD region (H) at one point The difference between the measured thicknesses of the bonding film 100 may be 10% or less. The difference value may be 5% or less. The difference value may be 2% or less.

The HUD region H may be formed to have a height of 10 cm or more along the surface of the film starting from a position about 6 cm or more away from one edge of the film 100 in the width direction Dw. The HUD region H may be formed to have a height of 20 cm or more along the surface of the film starting from a position about 6 cm or more away from one edge of the film 100 in the width direction Dw. The HUD region H may be formed to have a height of 35 cm or more along the surface of the film starting from a position about 6 cm or more away from one edge of the film 100 in the width direction Dw. The HUD region H may be formed to have a height of 100 cm or less along the surface of the film starting from a position about 6 cm or more away from one edge of the film 100 in the width direction Dw. The HUD region H may be formed to have a height of 40 cm or less along the surface of the film starting at a position more than about 6 cm away from one edge of the film 100 in the width direction Dw.

The HUD region H may be disposed in all or part of the region from a position spaced apart from one edge by about 10 cm in the direction of the other end to a position spaced apart by 80 cm in the direction of the other end in the width direction Dw of the film 100. .

The high refractive index layer 10 includes one surface and the other surface facing the one surface.

In the HUD region H, at least a portion of the one surface and the other surface of the high refractive index layer 10 may include a non-parallel non-parallel region.

The HUD region H may have a thickness variation value of 4.36*10 ⁻⁴ cm or more per 1 cm in the width direction of the high refractive index layer 10 and/or the base layer 20 in the film 100 .

In the Ÿ‡ region, light is incident from the HUD projector in the direction of one surface of the high refractive layer 10 and the reflected light reflected on one surface of the high refractive layer 10 reaches the observer's eye, and at the same time, the high refractive index layer 10 Paths of incident and refracted light are adjusted so that the refracted light refracted from one surface and reflected from the other surface that is not parallel to one surface reaches the viewer's eye after being refracted from one surface to help prevent a double image recognized by the viewer.

The first point d1 and the third point d3 are points located on one surface of the high refractive index layer 10 in the HUD region H, respectively.

The second point d2 and the fourth point d4 are points located on the other surface of the high refractive index layer in the HUD region H, respectively.

The third point d3 may be located 1 cm apart from the first point d1 in the width direction Dw of the film 100 . The first point d1 and the second point d2 may be located on the same line in the thickness direction of the film 100 . The third point d3 and the fourth point d4 may be located on the same line in the thickness direction of the film 100 .

The extension line passing through the first point d1 and the third point d3 is the first line L1, and the extension line passing through the second point d2 and the fourth point d4 is the second line L2. and an angle between the first line L1 and the second line L2 at the contact point between the first line L1 and the second line L2 is W.

W has a constant or non-constant value other than 0 in the Ÿ‡ region.

The Ÿ‡ region includes a portion where W is 0.01 to 1.2 degrees.

The thickness of the high refractive layer 10 at the point where one end or the other end of the Ÿ‡ paper region is located is smaller than the distance between the one side and the other side of the bonding film 100 at the point where the one end or the other end is located. can At the point where one end and the other end of the Ÿ‡ paper region are positioned, the thickness of the high refractive layer 10 is smaller than the distance between one surface and the other surface of the bonding film 100 at the point where the one end and the other end are positioned. can In this case, the thickness of the bonding film in the width direction can be adjusted within a certain range while suppressing the formation of a double image by refracting and reflecting the HUD image light projected onto the Ÿ‡ paper area at an appropriate angle.

The first point d1 is located on one surface of the high refractive index layer 10 in the Ÿ‡ region, and its position is not limited.

The third point d3 is positioned 1 cm apart from the first point d1 in the width direction Dw of the film 100 . If a point spaced 1 cm apart in one direction in the width direction Dw of the film 100 from the first point d1 falls outside the HUD area H, the position of the third point d3 is the first point d1 ) is a point spaced apart by 1 cm in the direction opposite to the one direction in the width direction Dw of the film 100 .

W may be a constant value in the width direction Dw of the film 100 in the HUD region H.

In this case, the cross-sectional shape of the Ÿ‡ support area may be generally trapezoidal or triangular. Specifically, when the cross-sectional shape of the Ÿ‡ support region is generally triangular, an isosceles triangle, a right triangle, etc. may be applied to the triangle, and specifically an isosceles triangle shape may be applied (see FIGS. 4 and 5 ).

W may be a value that increases from one end to the other end in the width direction Dw of the film 100 in the HUD region H. W may be a value that decreases from one end to the other end in the width direction Dw of the bonding film 100 in the HUD region H. In this case, the cross-sectional shape of the Ÿ‡ support region is generally trapezoidal or triangular, and a line corresponding to the one surface or the other surface may be concave or convex (see FIG. 6 ).

Exemplarily, when the Ÿ‡ support region includes a part of an arc shape of a circle or an ellipse, the arc included in the Ÿ‡ support region is disposed to be in contact with or close to the base of the triangular shape, and the A discontinuous portion between the vertex and the arc, which is divided by a tangent between the vertex of the triangular shape and the arc, may be excluded from the Ÿ‡ support region.

Exemplarily, when the Ÿ‡ support region includes a part of an arc shape of a circle or an ellipse, the arc included in the Ÿ‡ support region is disposed in contact with or close to the base of the trapezoidal shape, and the A discontinuous portion between the trapezoidal shape and the arc shape, which is divided by an imaginary point where the extension lines of the trapezoidal shape intersect and a tangent to the arc, are excluded from the Ÿ‡ support region.

The Ÿ‡ region may include a portion in which W is a constant or non-constant value of 0.01 to 1.2 degrees. The Ÿ‡ region may include a portion in which W is a constant or non-constant value of 0.07 to 1.1 degrees. The Ÿ‡ region may include a portion in which W is a constant or non-constant value of 0.08 to 1.0 degrees. In this case, it can help suppress the occurrence of ghost images in the HUD image projected to the Ÿ‡ region.

The base layer 20 may include a region in which the thickness of the bonding film 100 varies in the width direction Dw. The thickness of the base layer 20 may vary in the width direction Dw of the bonding film 100 opposite to the high refractive index layer 10 described above. Specifically, the thickness of the base layer 20 may decrease in a section in which the thickness of the high refractive index layer 10 increases, and the thickness of the base layer 20 may increase in a section in which the thickness of the high refractive index layer 10 decreases. . The difference in thickness in the width direction (Dw) of the bonding film 100 may be reduced through this thickness variation region. That is, the base layer 20 is disposed on the bonding film 100 together with the high refractive index layer 10, and by adjusting the thickness deviation having in the width direction (Dw) of the bonding film 100 for bonding film 100 Convenience can be improved in the winding process and post-process of

The bonding film 100 may include a base layer 20 disposed in direct contact with one surface of the high refractive index layer 10 .

The bonding film 100 may further include another layer between the base layer 20 and the high refractive index layer 10 .

One side of the base layer 20 may have a shape corresponding to the high refractive index layer 10 . Illustratively, when the thickness of the high refractive index layer 10 is increased to have a W of about 1 degree in the Ÿ‡ paper region, the base layer 20 decreases in thickness at an angle of about -1 degree, so that the film 100 as a whole has a width. A thickness change in the direction Dw may be reduced. In addition, if the first base layer 20 and the second base layer 20 are disposed on one surface and the other surface of the high refractive layer 10, respectively, the high refractive layer 10 generates a W of about 1 degree in the Ÿ‡ paper region. Corresponding to the increase in thickness having the thickness of the film 100 as a whole in the width direction Dw, the thickness of the first base layer 20 and the second base layer 20 decreases at an angle of about -0.5 degrees, respectively. can be reduced

With this arrangement of the base layer 20 , it is possible to provide the film 100 in the form of an internal Ÿ‡ paper in which the high refractive index layer 10 is disposed inside the base layer 20 . Referring to FIG. 2 , the base layer 20 and the thiourethane layer 10 may have different lengths in the width direction Dw. The length of the base layer 20 in the width direction Dw may be longer than the length of the thiourethane layer 10 in the width direction Dw.

Composition of high refractive layer

The high refractive index layer 10 includes a thiourethane-based repeating unit. The thiourethane-based repeating unit is a repeating unit included in polythiourethane.

The thiourethane-based repeating unit may include a cycloalkanediyl-based repeating unit. The thiourethane-based repeating unit may include a cycloalkenediyl-based repeating unit.

In the embodiment, polythiourethane refers to a compound produced by i) a reaction between a thiol-based compound and a diisocyanate compound, or ii) a compound produced by a reaction between a mixture of a thiol-based compound and a polyol-based compound and a diisocyanate compound .

The thiourethane-based repeating unit may include a cycloalkanediyl-based repeating unit. The thiourethane-based repeating unit may include a cycloalkenediyl-based repeating unit.

The thiourethane-based repeating unit may include a heterocycloalkanediyl-based repeating unit having 3 to 10 carbon atoms. The thiourethane-based repeating unit may include a heterocycloalkenediyl-based repeating unit having 3 to 10 carbon atoms.

The thiourethane-based repeating unit may include a linear alkanediyl-based repeating unit having 4 to 10 carbon atoms. The thiourethane-based repeating unit may include a linear alkenediyl-based repeating unit having 4 to 10 carbon atoms. The thiourethane-based repeating unit may include a linear alkyndiyl-based repeating unit having 4 to 10 carbon atoms.

The heterocycloalkanediyl-based repeating unit and the heterocycloalkenediyl-based repeating unit may each include a sulfur atom in the repeating unit.

The heterocycloalkanediyl-based repeating unit may be a C4 to C10 heterocycloalkanediyl containing 1 to 5 sulfur atoms. The heterocycloalkanediyl repeating unit may be a heterocycloalkanediyl having 4 to 9 carbon atoms including 2 to 5 sulfur atoms.

The heterocycloalkanediyl-based repeating unit may include a dithiane functional group. The heterocycloalkanediyl-based repeating unit may include a 1,2-dithiane functional group. The heterocycloalkanediyl-based repeating unit may include a 1,3-dithiane functional group. The heterocycloalkanediyl-based repeating unit may include a 1,4-dithiane functional group. Illustratively, the heterocycloalkanediyl-based repeating unit may be a methyldithian functional group, a dimethyldithian functional group, an ethylmethyldithiane functional group, or a diethyldithian functional group.

Specifically, the high refractive index layer 10 may include a heterocycloalkanediyl-based repeating unit represented by Chemical Formula 1 below.

[Formula 1]

In Formula 1, R1 is -O- or -S-, and X is a group including a C3-10 heterocycloalkanediyl repeating unit containing 1-5 sulfur atoms.

In Formula 1, R1 may be -O- or -S-, and X may be a C3-8 heterocycloalkanediyl group containing 1-5 sulfur atoms.

In Formula 1, R1 may be -S-, and X may be a heterocycloalkanediyl group having 3 to 8 carbon atoms and including 2 to 3 sulfur atoms.

The heterocycloalkenediyl repeating unit is a repeating unit in which 1 to 3 carbon-carbon single bonds are substituted with carbon-carbon double bonds in the heterocycloalkanediyl-based repeating unit represented by Formula 1 above. The heterocycloalkenediyl repeating unit may be a heterocycloalkenediyl having 3 to 10 carbon atoms and including 1 to 5 sulfur atoms. The heterocycloalkenediyl-based repeating unit may be a heterocycloalkenediyl having 3 to 8 carbon atoms and 2 to 5 sulfur atoms.

The heterocycloalkanediyl-based repeating unit may be a repeating unit represented by Formula 3 below.

[Formula 3]

In Formula 3, R1 is -O- or -S-, and n11 and n12 are each independently an integer of 0 to 3.

In Formula 3, R1 is -S-, and n11 and n12 are each independently 1 or 2.

The heterocycloalkenediyl repeating unit is a repeating unit in which 1 to 3 carbon-carbon single bonds are substituted with carbon-carbon double bonds in the heterocycloalkanediyl-based repeating unit represented by Formula 3 above.

The heterocycloalkenediyl-based repeating unit may be a repeating unit including 1 or 2 oxygen atoms, 2 or 3 sulfur atoms, and a 1,4-dithiane group.

The heterocycloalkenediyl-based repeating unit may be a repeating unit including one oxygen atom, three sulfur atoms, and a 1,4-dithiane group.

Illustratively, the heterocycloalkenediyl-based repeating unit is 1,4-dithiacyclohex-2-ene (1,4-dithiacyclohex-2-ene) or 1,4-dithiacyclohex-4-cene (1 ,4-dithiacyclohex-4-ene) group may be included.

The thiourethane-based repeating unit may include a linear alkanediyl-based repeating unit. The thiourethane-based repeating unit may include a linear alkenediyl-based repeating unit. The thiourethane-based repeating unit may include a linear alkyndiyl-based repeating unit.

The thiourethane-based repeating unit may include a linear alkanediyl-based repeating unit having 4 to 10 carbon atoms. The thiourethane-based repeating unit may include a linear alkenediyl-based repeating unit having 4 to 10 carbon atoms. The thiourethane-based repeating unit may include a linear alkyndiyl-based repeating unit having 4 to 10 carbon atoms.

The linear alkenediyl repeating unit having 4 to 10 carbon atoms is a repeating unit in which 1 to 3 carbon-carbon single bonds are substituted with carbon-carbon double bonds in the linear alkanediyl repeating unit having 4 to 10 carbon atoms. For example, the alkenediyl-based repeating unit may be a 2-hexenediyl-based repeating unit or a 3-hexenediyl-based repeating unit.

The linear alkyndiyl repeating unit having 4 to 10 carbon atoms is a repeating unit in which 1 to 3 carbon-carbon single bonds are substituted with carbon-carbon triple bonds in the linear alkanediyl-based repeating unit having 4 to 10 carbon atoms. Illustratively, the alkyndiyl-based repeating unit may be a 2-hexynediyl-based repeating unit or a 3-hexynediyl-based repeating unit.

Specifically, the high refractive index layer 10 may include a linear alkanediyl repeating unit represented by Chemical Formula 2 below.

[Formula 2]

In Formula 2, R2 is -O- or -S-, and n2 is an integer of 4 to 10.

In Formula 2, R2 is -O- or -S-, and n2 may be an integer of 5 to 8.

In Formula 2, R2 may be -O- or -S-, and n2 may be an integer of 5 to 7.

The high refractive layer 10 may include a linear alkenediyl repeating unit in which 1 to 3 carbon-carbon single bonds are substituted with carbon-carbon double bonds in the linear alkanediyl-based repeating unit represented by Formula 2 above. .

The high refractive index layer 10 may include a linear alkyndiyl repeating unit in which 1 to 3 carbon-carbon single bonds are substituted with carbon-carbon triple bonds in the linear alkanediyl-based repeating unit represented by Formula 2 above. .

The high refractive index layer 10 may include a heterocycloalkanediyl-based repeating unit and a linear alkanediyl-based repeating unit to control the refractive index and modulus of the high refractive index layer 10 together.

The high refractive layer 10 may include 20 to 50 mol% of the repeating unit of Formula 1 based on the total high refractive index layer 10 . The high refractive index layer 10 may include 22 to 48 mol% of the repeating unit of Formula 1 based on the total high refractive index layer 10 . In this case, the high refractive index layer 10 having a higher refractive index can be obtained. When the high refractive index layer 10 is applied to the bonding film 100 as a high refractive index layer, the thickness in the width direction (Dw) of the film 100 can be substantially constant while having a function of preventing double image formation.

The high refractive index layer 10 may include 20 to 50 mol% of the repeating unit of Chemical Formula 3 based on the total high refractive index layer 10 . The high refractive index layer 10 may include 22 to 48 mol% of the repeating unit of Chemical Formula 3 based on the total high refractive index layer 10 . When the high refractive index layer 10 is applied to the bonding film 100 , it is possible to have a function of preventing double image formation while substantially making the thickness in the width direction (Dw) of the bonding film 100 constant.

The high refractive layer 10 may include 20 to 50 mol% of the repeating unit of Formula 2 based on the total high refractive index layer 10 . The high refractive layer 10 may include 30 to 50 mol% of the repeating unit of Formula 2 based on the total high refractive index layer 10 . In this case, the modulus of the bonding film 100 including the high refractive index layer 10 may be lowered. This feature helps to be easily wound in a roll form when applied to the bonding film 100 .

The high refractive index layer 10 may contain 15 to 35% by weight of sulfur atoms. The high refractive index layer 10 may contain 17 to 30% by weight of sulfur atoms. The high refractive index layer 10 may contain 20 to 25 wt% of sulfur atoms. In this case, the refractive index of the high refractive index layer 10 can be made higher.

The high refractive layer 10 may have a number average molecular weight of 5000 to 500000. The weight average molecular weight may be 6000 to 450000. The weight average molecular weight may be 7000 to 400000. In this case, the degree of polymerization between the polyfunctional compound and the diisocyanate-based compound is controlled so that the modulus of the high refractive index layer 10 may be within a desired range.

composition of the base layer

The base layer 20 may include polyvinyl acetal repeating units. The base layer 20 may include a polyurethane repeating unit. The base layer 20 may include ethylene vinyl acetate repeating units.

The base layer 20 may include a polyvinyl acetal resin, and may include a polyvinyl acetal resin and a plasticizer.

Since it overlaps with the following description of the polyvinyl acetal resin and other compositions included in the base layer 20, it is omitted.

The base layer 20 may include a polyurethane resin. The polyurethane resin may be a thermoplastic polyurethane. Polyurethane resins can be prepared through condensation polymerization of polyisocyanate and polyesterdiol. As the polyurethane resin, a polyurethane resin having an average molecular weight of 5000 to 40000 g/mol may be applied.

The base layer 20 may include an ethylene vinyl acetate resin. The base layer 20 may include an ethylene vinyl acetate resin, a crosslinking agent, and a silane coupling agent. The ethylene vinyl acetate resin may include 5 to 80 wt% of a vinyl acetate monomer.

additional functional layer

The bonding film 100 may further include another layer between the base layer 20 and the high refractive index layer 10 . The other layer may be, for example, a sound insulating layer, but is not limited thereto.

The sound insulating layer may be positioned between the high refractive index layer 10 and the base layer 20 . The sound insulating layer may be located on one surface of the base layer 20 . The sound insulating layer may be located inside the base layer 20 .

The sound insulating layer may include polyvinyl acetal resin.

A description of the polyvinyl acetal resin and other compositions included in the sound insulating layer will be omitted because it overlaps with the following.

Preparation of bonding film having a high refractive index layer

Resin for manufacturing high refractive index layer and manufacturing method

The composition for preparing a high refractive index layer according to another embodiment of the present specification includes a polyfunctional compound and an isocyanate-based compound.

The polyfunctional compound includes a thiol-based compound and/or a polyol compound including two or more hydroxyl groups or thiol groups.

The thiol-based compound includes a C4 to C10 heterocycloalkanediyl group containing 1 to 5 sulfur atoms.

The thiol-based compound may include a C 4 to C 10 heterocycloalkenediyl group containing 1 to 5 sulfur atoms. The heterocycloalkenediyl group refers to a group in which 1 to 3 carbon-carbon single bonds are substituted with carbon-carbon double bonds in the heterocycloalkanediyl group.

The heterocycloalkanediyl-based repeating unit may be a C4 to C10 heterocycloalkanediyl containing 1 to 5 sulfur atoms. The heterocycloalkanediyl repeating unit may be a heterocycloalkanediyl having 4 to 9 carbon atoms including 2 to 5 sulfur atoms.

The heterocycloalkenediyl repeating unit may be a C4 to C10 heterocycloalkenediyl containing 1 to 5 sulfur atoms. The heterocycloalkenediyl repeating unit may be a heterocycloalkenediyl having 4 to 9 carbon atoms including 2 to 5 sulfur atoms.

Illustratively, heterocycloalkenediyl is 1,4-dithiacyclohex-2-ene (1,4-dithiacyclohex-2-ene) or 1,4-dithiacyclohex-4-cene (1,4- dithiacyclohex-4-ene) group.

The isocyanate-based compound includes a linear aliphatic polyisocyanate compound having two or more isocyanate groups.

The linear aliphatic polyisocyanate compound includes an alkanediyl having 4 to 10 carbon atoms.

The linear aliphatic polyisocyanate compound may include an alkenediyl having 4 to 10 carbon atoms. Alkenediyl having 4 to 10 carbon atoms means that in the alkanediyl, 1 to 3 carbon-carbon single bonds are substituted with carbon-carbon double bonds.

Linear alkenediyl having 4 to 10 carbon atoms is a repeating unit in which 1 to 3 carbon-carbon single bonds are substituted with carbon-carbon double bonds in a linear alkanediyl repeating unit having 4 to 10 carbon atoms. For example, the alkenediyl-based repeating unit may be a 2-hexenediyl-based repeating unit or a 3-hexenediyl-based repeating unit.

The linear aliphatic polyisocyanate compound may include an alkyndiyl having 4 to 10 carbon atoms. Alkyndiyl having 4 to 10 carbon atoms means that in the alkanediyl, 1 to 3 carbon-carbon single bonds are substituted with carbon-carbon triple bonds.

The linear alkyndiyl repeating unit having 4 to 10 carbon atoms is a repeating unit in which 1 to 3 carbon-carbon single bonds are substituted with carbon-carbon triple bonds in the linear alkanediyl repeating unit having 4 to 10 carbon atoms. Illustratively, the alkyndiyl-based repeating unit may be a 2-hexynediyl-based repeating unit or a 3-hexynediyl-based repeating unit.

The heterocycloalkanediyl group may include a dithiane functional group. The heterocycloalkanediyl group may include a 1,2-dithiane functional group. The heterocycloalkanediyl group may include a 1,3-dithiane functional group. The heterocycloalkanediyl group may include a 1,4-dithiane functional group. Illustratively, the heterocycloalkanediyl-based repeating group may be a methyldithian functional group, a dimethyldithian functional group, an ethylmethyldithian functional group, or a diethyldithian functional group.

The thiol-based compound serves to adjust the refractive index of the high refractive index layer 10 when the thiourethane layer 10 is formed through polymer polymerization of the composition for preparing the high refractive index layer. In addition, the thiol-based compound can improve the workability of the film including the high refractive index layer 10 by adjusting the flexibility of the high refractive index layer 10 .

The polyol compound may include an alkanediyl group having 2 to 10 carbon atoms. The polyol compound may be a polyether polyol including an alkanediyl group having 2 to 10 carbon atoms.

The isocyanate-based compound may include a linear aliphatic polyisocyanate compound having two or more isocyanate groups. The isocyanate-based compound may include a cycloaliphatic polyisocyanate compound having two or more isocyanate groups. The cycloaliphatic polyisocyanate compound may include one or more cycloalkanediyl groups.

The composition for preparing a high refractive index layer may include a thiol-based compound in a molar ratio of 50 to 97 based on a content of 100 of the polyfunctional compound. The composition for preparing a high refractive index layer may include a thiol-based compound in a molar ratio of 60 to 95 based on the content of 100 of the polyfunctional compound. The composition for preparing a high refractive index layer may include a thiol-based compound in a molar ratio of 65 to 93 based on a content of 100 of the polyfunctional compound. In this case, the high refractive index layer 10 prepared through the composition for preparing the high refractive index layer 10 helps suppress the formation of a double image of the HUD image through the bonding film 100 including the high refractive index layer 10 by adjusting the refractive index.

The polyol compound may include a polyether polyol having a number average molecular weight of 100 to 1000. The polyol compound may include a polyether polyol having a number average molecular weight of 120 to 900. The polyol compound may include a polyether polyol having a number average molecular weight of 140 to 800. In this case, the composition for preparing the high refractive index layer may prepare the high refractive index layer 10 with controlled flexibility.

The composition for preparing a high refractive index layer may include a thiol-based compound and an isocyanate-based compound in a molar ratio of 1: 0.7 to 1.3. The composition for preparing a high refractive index layer may include a thiol-based compound and an isocyanate-based compound in a molar ratio of 1: 0.8 to 1.2. The composition for preparing a high refractive index layer may include a thiol-based compound and a linear aliphatic isocyanate compound in a molar ratio of 1: 0.7 to 1.3. The composition for preparing a high refractive index layer may include a thiol-based compound and a linear aliphatic isocyanate compound in a molar ratio of 1: 0.8 to 1.2. In this case, the high refractive index layer 10 prepared through the composition for preparing the high refractive index layer 10 helps suppress the formation of a double image of the HUD image, and the flexibility is controlled, so that workability in winding and post-processing can be improved.

The composition for preparing a high refractive index layer may include the thiol-based compound in a molar ratio of 55 to 120 based on 100 of the sum of the content of the isocyanate-based compound and the content of the polyether polyol. The composition for preparing a high refractive index layer may include the thiol-based compound in a molar ratio of 65 to 110 based on 100 of the sum of the content of the isocyanate-based compound and the content of the polyether polyol. The composition for preparing a high refractive index layer may include the thiol-based compound in a molar ratio of 55 to 120 based on 100 of the sum of the content of the linear aliphatic isocyanate compound and the content of the polyether polyol. The composition for preparing a high refractive index layer may include the thiol-based compound in a molar ratio of 65 to 110 based on 100 of the sum of the content of the linear aliphatic isocyanate compound and the polyether polyol. In this case, the refractive index of the high refractive index layer 10 prepared through the composition for preparing the high refractive index layer may be adjusted within a certain range and at the same time, the modulus may be adjusted to be suitable for the winding process.

The composition for preparing a high refractive index layer may include a catalyst. A catalyst may be added to increase the reaction rate of the thiourethane resin. The catalyst serves to accelerate the rate of the condensation polymerization reaction occurring between the isocyanate group and the hydroxyl group or the isocyanate group and the thiol group in the mixture.

The catalyst may be a tin-based compound. The catalyst is, for example, DMDC (Dimethyltin dichloride) or DBDC (Dibutyltin dichloride). However, the present invention is not limited thereto.

The composition for preparing a high refractive index layer may contain 50 to 1000 ppm of the catalyst. The composition for preparing a high refractive index layer may contain 100 to 900 ppm of the catalyst. The composition for preparing the high refractive index layer may include 200 to 800 ppm of the catalyst. In these cases. It is possible to shorten the synthesis reaction time of the thiourethane resin.

Hereinafter, a method for producing a thiourethane resin will be described in detail.

The method for producing a thiourethane resin is a reaction step of preparing a reaction solution by inducing a reaction between an isocyanate group and a hydroxyl group or an isocyanate group and a thiol group of a composition for preparing a high refractive index layer comprising an isocyanate-based compound and a polyfunctional compound, and the reaction solution is 100 It includes an aging step of preparing a thiourethane resin by proceeding the reaction at an aging temperature of 150 ℃.

The composition of the composition for preparing the high refractive index layer is omitted because it overlaps with the contents described above.

A catalyst may be added to the composition for preparing a high refractive index layer to increase the reaction rate of the thiourethane resin. The catalyst serves to accelerate the rate of the condensation polymerization reaction occurring between the isocyanate group and the hydroxyl group or the isocyanate group and the thiol group in the mixture.

The catalyst may be a tin-based compound. The catalyst is, for example, DMDC (Dimethyltin dichloride) or DBDC (Dibutyltin dichloride). However, the present invention is not limited thereto.

The reaction step may be performed in a melt polymerization method. Specifically, an isocyanate-based solution may be prepared by adding 50 to 1000 ppm of the catalyst to a solution in which the isocyanate-based compound is mixed.

A polyfunctional compound melt may be prepared by heating the polyfunctional compound to 40 to 180° C. in the presence of an atmospheric gas such as N ₂ . A reaction solution may be prepared by inducing a condensation polymerization reaction between an isocyanate group, a hydroxyl group, or an isocyanate group and a thiol group by dropping an isocyanate-based solution to the polyfunctional compound melt. The reaction step may proceed for 10 to 360 minutes.

After the reaction step, the reaction solution may be reacted at an aging temperature of 100 to 150° C. to prepare a thiourethane resin. Specifically, the reaction solution after the reaction step may be dropped onto a tray made of Teflon or a release treatment. Aging may be performed for 4 to 20 hours in an oven controlled at 100 to 150° C. on the tray containing the reaction solution. In this case, it is possible to sufficiently induce the reaction of the prepared thiourethane resin and to obtain a resin having stable physical properties as a whole.

The number average molecular weight of the prepared thiourethane resin may be 5000 to 500000. The weight average molecular weight may be 6000 to 450000. The weight average molecular weight may be 7000 to 400000. In this case, the degree of polymerization between the polyfunctional compound and the diisocyanate-based compound is controlled, so that the thiourethane resin may have desired physical properties.

The prepared thiourethane resin may include a heterocycloalkanediyl-based repeating unit and a linear alkanediyl-based repeating unit. Specifically, the heterocycloalkanediyl-based repeating unit may be a repeating unit represented by Formula 1 below, and the linear alkanediyl-based repeating unit may be a repeating unit represented by Formula 2 below.

[Formula 1]

[Formula 2]

In Formula 1, R1 is -O- or -S-, X is a group including a C3-10 heterocycloalkanediyl repeating unit including 1-5 sulfur atoms, and in Formula 2, R2 is -O- or -S-, and n2 is an integer from 4 to 10.

The thiourethane resin may be stored in the form of pellets or chips after synthesis, and may be applied to the manufacture of the high refractive index layer 10 .

Resin and manufacturing method for base layer manufacturing

The base layer 20 may include a polyvinyl acetal resin, and may include a polyvinyl acetal resin and a plasticizer.

Specifically, the base layer 20 may include the polyvinyl acetal resin in an amount of 60 to 76% by weight, 70 to 76% by weight, or 71 to 74% by weight. When the polyvinyl acetal resin is included in this range, it is possible to impart relatively high tensile strength and modulus to the bonding film 100 .

The polyvinyl acetal resin may have an acetyl group content of less than 2 wt%, and specifically 0.01 or more and less than 1.5 wt%. The polyvinyl acetal resin may have a hydroxyl group content of 15 wt% or more, 16 wt% or more, and 19 wt% or more. In addition, the polyvinyl acetal resin may have a hydroxyl group content of 30% by weight or less.

When a polyvinyl acetal resin having these characteristics is applied to the base layer 20 , the bonding film 100 may have mechanical properties such as appropriate penetration resistance while being excellently bonded to a substrate such as glass.

The polyvinyl acetal resin may be a polyvinyl acetal resin obtained by acetalizing polyvinyl alcohol having a polymerization degree of 1,600 to 3,000 with aldehyde, and a polyvinyl acetal resin obtained by acetalizing polyvinyl alcohol having a degree of polymerization of 1,700 to 2,500 with aldehyde. can be When this polyvinyl acetal resin is applied to the base layer 20 , mechanical properties such as penetration resistance of the bonding film 100 can be sufficiently improved.

The polyvinyl acetal resin may be a synthesis of polyvinyl alcohol and an aldehyde, and the type of the aldehyde is not limited. Specifically, the aldehyde may be any one selected from the group consisting of n-butyl aldehyde, isobutyl aldehyde, n-barrel aldehyde, 2-ethyl butyl aldehyde, n-hexyl aldehyde, and blend resins thereof. When n-butyl aldehyde is applied as the aldehyde, the prepared polyvinyl butyral resin may have a refractive index characteristic with a small difference from the refractive index of glass, and may have excellent bonding strength with glass.

The base layer 20 may include 24 to 40 wt% of the plasticizer, 24 to 30 wt%, and 26 to 29 wt% based on the entire base layer 20. When the plasticizer is included in this range, it is good in that it can impart appropriate bonding strength and impact resistance to the bonding film 100 .

Specifically, as the plasticizer, triethylene glycol bis 2-ethylhexanoate (3G8), tetraethylene glycol diheptanoate (4G7), triethylene glycol bis 2-ethylbutyrate (3GH), triethylene glycol bis 2-hep the group consisting of thanoate (3G7), dibutoxyethoxyethyl adipate (DBEA), butyl carbitol adipate (DBEEA), dibutyl sebacate (DBS), bis 2-hexyl adipate (DHA), and combinations thereof Any one selected from may be applied, and specifically, consisting of triethylene glycol di-2-ethyl butyrate, triethylene glycol di-2-ethylhexanoate, triethylene glycol di-n-heptanoate, and combinations thereof. It may include any one selected from the group, and more specifically, triethylene glycol bis 2-ethylhexanoate (3G8) may be applied.

The base layer 20 may further include additives as necessary, for example, the additives are selected from the group consisting of antioxidants, heat stabilizers, UV absorbers, UV stabilizers, IR absorbers, glass bonding strength regulators, and combinations thereof. It can be any one.

The antioxidant may be a hindered amine-based or hindered phenol-based antioxidant. Specifically, in the polyvinyl butyral (PVB) manufacturing process that requires a process temperature of 150° C. or higher, a hindered phenol-based antioxidant is more preferable. The hindered phenol-based antioxidant may be, for example, IRGANOX 1076 or 1010 manufactured by BASF.

The thermal stabilizer may be a phosphite-based thermal stabilizer in consideration of compatibility with antioxidants. For example, BASF's IRGAFOS 168 can be used.

As the UV absorber, Chemisorb 12, Chemisorb 79, Chemisorb 74, Chemisolv 102, BASF Tinuvin 328, Tinuvin 329, Tinuvin 326, etc. from Chemipro Chemicals can be used as the UV absorber. As the UV stabilizer, BASF's Tinuvin may be used. ITO, ATO, AZO, etc. may be used as the IR absorber, and the glass bonding strength adjusting agent may include metal salts such as Mg, K, Na, epoxy-modified Si oil, or a mixture thereof, but is not limited thereto. .

The bonding film 100 may include a functional layer in addition to the high refractive index layer 10 and the base layer 20 . The functional layer may be a sound insulating layer.

The sound insulating layer may be positioned between the high refractive index layer 10 and the base layer 20 . The sound insulating layer may be located on one surface of the base layer 20 . The sound insulating layer may be located inside the base layer 20 .

The sound insulating layer may include polyvinyl acetal resin.

The sound insulating layer may include 54 wt% or more and 76 wt% or less of the polyvinyl acetal resin, and may include 60 wt% or more and 70 wt% or less.

The sound insulating layer may include 24 wt% or more and 46 wt% or less of a plasticizer, and may include 30 wt% or more and 40 wt% or less.

The polyvinyl acetal resin included in the sound insulating layer may have an acetyl group content of 8 wt % or more, specifically 8 wt % or more and 30 wt % or less, based on the total polyvinyl acetal resin. In addition, the polyvinyl acetal resin included in the sound insulating layer may have a hydroxyl group content of 26 wt% or less, and may be 5 wt% or more and 25 wt% or less. In this case, more stable sound insulation properties may be imparted to the bonding film 100 .

Manufacturing method of bonding film

The film production method is a preparation step of introducing a thiourethane resin comprising a thiourethane-based repeating unit represented by Chemical Formula 1 and an alkanediyl-based repeating unit represented by Chemical Formula 2 into an extruder, and setting the temperature inside the extruder to 120 to 200 A film including the high refractive index layer (10) is prepared, including a shaping step of manufacturing the high refractive index layer (10) by extruding while maintaining the extrusion temperature of °C.

In the preparation stage, the description of the repeating unit included in the thiourethane resin is omitted because it overlaps with the content described above.

The thiourethane resin may be chopped so that it can be easily added to the extruder.

After the thiourethane resin is put into the extruder, the high refractive index layer 10 can be prepared by extruding while maintaining the temperature inside the extruder at 120 to 200° C. in the shaping step. The extruder may apply a twin screw extruder. The extruder may apply a single screw extruder.

The high refractive index layer 10 may be manufactured in a sheet shape by extruding a thiourethane resin, and molding the extruded thiourethane resin through T-DIE or the like. Specifically, the high refractive index layer 10 may be formed by adjusting the angles of one surface and the other surface so that the high refractive index layer 10 has the above angle. However, the manufacturing method of the high refractive index layer 10 is not limited to the above method.

The high refractive index layer 10 may be co-extruded together with the base layer 20 described above.

In the case of manufacturing the bonding film 100 in a co-extrusion method, the resin applied to the base layer 20 and the resin applied to the high refractive index layer 10 are put into two or more extruders, respectively, and extruded so that each layer is intended A film is prepared to have a shape.

When a polyvinyl acetal layer in which a plasticizer is mixed is applied as the base layer 20, it may be extruded while maintaining the temperature normally applied to the polyvinyl acetal layer application. Additional additives may be further applied as needed.

At this time, a lamination means such as a feed block may be further applied to the front end of the T-DIE.

The bonding film 100 may be manufactured by a heat compression method through a hot press.

The thiourethane layer 10 may be separately manufactured through an extruder. The thiourethane layer 10 may be separately manufactured using a mold. Specifically, the thiourethane resin may be put into a Ÿ‡ paper-shaped mold having the angle of the Ÿ‡ paper, and the thiourethane layer 10 may be manufactured by hot pressing with a hot press.

The base layer 20 may be separately manufactured through an extruder. The base layer 20 may be manufactured to have an intended shape by putting the resin composition applied to the base layer 20 in an extruder and extruding it. The base layer 20 may be extruded while maintaining the temperature normally applied to the application of the polyvinyl acetal layer when the polyvinyl acetal layer mixed with the plasticizer is applied similarly to the co-extrusion method. Additional additives may be further applied to the base layer 20 if necessary.

The thiourethane layer 10 and the base layer 20 prepared above are laminated in the order of the base layer 20 / thiourethane layer 10 / base layer 20, and then heat-compressed with a hot press to prepare a bonding film can do. When heat-compressing with a hot press, the temperature can be applied at 120 to 180°C.

Since the description of the shape, component, etc. of each layer overlaps with the description above, detailed description thereof will be omitted.

The manufacturing method of the thiourethane layer 10 and the bonding film 100 is not limited to the above method.

The bonding film 100 is laminated between a pair of light transmitting bodies so that a pattern may be transferred on the surface of the bonding film 100 to improve the degassing properties of the bonding film 100 during the bonding process. A method of transferring the pattern includes a method using a pattern roller and a method using a pattern mold, but is not limited thereto.

The bonding film 100 thus formed may be laminated between a pair of light-transmitting bodies (not shown) to form a light-transmitting laminate (not shown). The light-transmitting laminate may be manufactured by sequentially or simultaneously applying a temporary bonding process and a main bonding process.

Light-transmitting laminate and moving means

A light transmitting laminate according to another embodiment disclosed herein is a first light transmitting layer (not shown), a bonding film 100 positioned on one surface of the first light transmitting layer, and the bonding It includes a second light-transmitting layer (not shown) positioned on the film 100 .

The first light-transmitting layer and the second light-transmitting layer may each independently be light-transmitting glass or light-transmitting plastic.

The above-described film is applied to the film, and a detailed description thereof will be omitted because it overlaps with the above description.

The moving means according to another embodiment disclosed herein includes the above-described light-transmitting laminate. The moving means includes a body forming the body of the moving means, a driving unit (engine, etc.) mounted on the body, a driving wheel (wheel, etc.) rotatably mounted on the body, and connecting the driving wheel and the driving unit. connecting device; and a windshield, which is a light-transmitting laminate that is mounted on a part of the body and blocks wind from the outside.

Hereinafter, specific examples will be described in more detail. In the following description of the experiment, when it is unclear whether the unit is weight% or mole% with respect to the % base, it means weight%.

Preparation Example: Preparation of a composition for preparing a high refractive index layer and a high refractive index layer

Preparation of thiourethane resin

When the total polyfunctional compound is 100 parts by weight, 75 parts by weight of BMMD (2,5-Bis(mercaptomethyl)-1,4-dithiane) and 25 parts by weight of PEG400 (Poly(ethylene glycol), mw400). A polyfunctional compound was prepared. When the total isocyanate-based compound was 100 parts by weight, 20 parts by weight of Hydrogenated Methylendiphenyl-4,4'-diisocyanate (H12MDI) and 80 parts by weight of Hexamethylene diisocyanate (HDI) were mixed to prepare an isocyanate-based compound.

50 to 500 ppm of DMDC (dimethyltin dichloride) as a catalyst was added to the isocyanate-based compound.

The polyfunctional compound is melted by heating to 40 to 180° C. in an N ₂ atmosphere, and the isocyanate-based compound is added dropwise to the molten polyfunctional compound in a molar ratio of 1:1, and the reaction step is performed for 120 minutes to obtain a reaction solution. got it

The reaction solution was transferred to a tray made of Teflon, an aging step of aging in an oven at 100 to 150° C. for 4 to 20 hours, and chopping to obtain a thiourethane resin.

Preparation of base layer resin composition

Polyvinyl butyral resin : PVA and n-BAL having a polymerization degree of 1700 and a saponification degree of 99 are added, and a polyvinyl butyral resin having 20.3 wt% of hydroxyl group, 78.9 wt% of butyral group, and 0.8 wt% of acetyl is produced through the usual synthesis process. got it

Preparation of additive: 0.1 parts by weight of Irganox1076 as an antioxidant, 0.2 parts by weight of TINUVIN-328 as a UV absorber, and 0.03 parts by weight of Mg Acetate as a bonding strength regulator were mixed and mixed to be sufficiently dispersed in a tumbler (total 0.33 parts by weight).

Manufacture of high refractive index layer and bonding film

Example 1: A thiourethane layer (B) was prepared by filling the prepared thiourethane resin in a mold in the form of Ÿ‡ paper and heating it with a hot press (HOT PRESS) applied at a temperature of 120 to 180°C. The prepared thiourethane layer (B) had a thickness of 20 μm at one end and a thickness of 760 μm at the other end, and W was 0.14 degrees.

In addition, the polyvinyl butyral resin composition containing 72.67 wt% of the prepared polyvinyl butyral resin, 27 wt% of 3g8 plasticizer, and 0.33 wt% of additives was added to the extruder and extruded to prepare a sheet-shaped base layer (A). After that, the prepared base layer (A) and the thiourethane film layer (B) were laminated in the form of (A) layer/(B) layer/(A) layer, and then molded by hot press to have a total thickness of 780 μm. was prepared.

Example 2: Prepared under the same conditions as in Example 1, but when the total isocyanate-based compound was 100 parts by weight, 30 parts by weight of H12MDI and 70 parts by weight of HDI were applied.

Example 3: Prepared under the same conditions as in Example 1, but when the total amount of the polyfunctional compound was 100 parts by weight, 92 parts by weight of BMMD and 8 parts by weight of PEG400 were applied, and the entire isocyanate-based compound was applied by HDI alone.

Comparative Example 1: Prepared under the same conditions as in Example 1, but when the total polyfunctional compound was 100 parts by weight, 80 parts by weight of BMMD and 20 parts by weight of PEG400 were applied, and when the total isocyanate-based compound was 100 parts by weight, 50 parts by weight of HXDI (Hydrogenated m-xylene diisocyanate [1,3-Bis (isocyanatomethyl) cyclohexane]) and 50 parts by weight of H12MDI were applied, and 200 ppm of DMDC was applied.

Comparative Example 2: Prepared under the same conditions as in Example 1, but when the total polyfunctional compound was 100 parts by weight, 60 parts by weight of BMMD and 40 parts by weight of PEG400 were applied, and when the total isocyanate-based compound was 100 parts by weight, 50 parts by weight of HXDI and 50 parts by weight of H12MDI were applied, and 200 ppm of DMDC was applied.

Comparative Example 3: Prepared under the same conditions as in Example 1, but when the total polyfunctional compound was 100 parts by weight, 70 parts by weight of BMMD and 30 parts by weight of PEG400 were applied, and when the total isocyanate-based compound was 100 parts by weight, 20 parts by weight of HXDI and 80 parts by weight of H12MDI were applied, and 200 ppm of DMDC was applied.

Comparative Example 4: Prepared under the same conditions as in Example 1, but when the total polyfunctional compound was 100 parts by weight, 40 parts by weight of BMMD and 60 parts by weight of PEG400 were applied, and when the total isocyanate-based compound was 100 parts by weight, 20 parts by weight of HXDI and 80 parts by weight of H12MDI were applied, and 200 ppm of DMDC was applied.

Evaluation example: evaluation of physical properties

Measurement of modulus

The modulus of the thiourethane layer specimens according to Examples and Comparative Examples was measured using Instrong's UTM 5566A model. The modulus was measured according to the method specified in ISO 527-3 at room temperature.

When the value of the modulus for each Example and Comparative Example was 300 kgf/mm ² or less, it was determined as O, and when it was greater than 300 kgf/mm ² it was determined as X.

The results for each Example and Comparative Example are shown in Table 2 below.

refractive index measurement

The refractive index of the high refractive layer for each Example and Comparative Example was measured using Atago's DR-M4 model. Specifically, after setting the measurement wavelength to 589.29 nm (D line) and the measurement temperature to 20° C., the high refractive index specimen was mounted on a measuring table to measure the refractive index.

The results for each Example and Comparative Example are shown in Table 2 below.

Plasticizer Absorption Rate Measurement

For each Example and Comparative Example, a high refractive index layer was prepared in the same manner as the high refractive index layer manufacturing method, but high refractive index layer specimens were prepared one by one to have a width of 15 × 15 mm and a thickness of 100 μm. In addition, in the same manner as the composition of the base layer resin composition described in the film manufacturing method for bonding, two base layer specimens were prepared so as to have a width * length of 25 * 25 mm and a thickness of 100 μm.

For each Example and Comparative Example, the high-refractive-layer specimen was laminated between two base layer specimens, and the weight increase of the high-refractive-layer specimen was measured after standing at 50° C. for 4 weeks. When the weight increase after standing compared to the weight of the high-refractive layer specimen before leaving it was 2% or less, it was set as a pass, and when it was 2% or more, it was set as a fail, and it is shown in Table 2 below.

Bonding force evaluation

For each Example and Comparative Example, a thiourethane layer was prepared in the same manner as the thiourethane layer manufacturing method, but one thiourethane layer specimen was prepared to have a width of 150 × 2500 mm. In addition, in the same manner as the composition of the base layer resin composition described in the film manufacturing method, a base layer specimen was prepared one by one to have a width of 150 * 25 mm.

After placing a base layer specimen on a glass plate for each Example and Comparative Example, and placing a thiourethane layer specimen on the base layer specimen, an aluminum foil having a thickness of 150 μm is placed on the thiourethane layer specimen, and at 150° C., 1 atm. Lamination was performed by pressing for 10 minutes.

After that, attach and fix the laminated specimen on the measuring table, and apply a force to the end of the thiourethane layer of the laminated specimen in a 90° direction from the ground. If delamination occurs first, it is set to fail and is shown in Table 2 below.

BMMD
(parts by weight) PEG400
(parts by weight) HXDI
(parts by weight) H12MDI
(parts by weight) HDI (parts by weight) DMDC (ppm) Example 1 75 25 - 20 80 500 Example 2 75 25 - 30 70 500 Example 3 92 8 - - 100 500 Comparative Example 1 80 20 50 50 - 200 Comparative Example 2 60 40 50 50 - 200 Comparative Example 3 70 30 20 80 - 200 Comparative Example 4 40 60 20 80 - 200

In Table 1, parts by weight of BMMD and PEG400 mean parts by weight when the total weight of the polyfunctional compound is 100 parts by weight, and the parts by weight of HXDI, H12MDI and HDI when the weight of the total isocyanate-based compound is 100 parts by weight. means parts by weight.

In Table 1, ppm was converted based on weight.

modulus refractive index plasticizer absorption rate Bonding force evaluation Example 1 O 1.572 pass pass Example 2 O 1.574 pass pass Example 3 O 1.606 pass pass Comparative Example 1 X 1.588 pass pass Comparative Example 2 O 1.561 fail pass Comparative Example 3 X 1.565 fail pass Comparative Example 4 O 1.537 fail pass

According to Table 2, all of the refractive indices measured in Examples and Comparative Examples were measured to be 1.50 or more. Meanwhile, in Examples 1 to 3, the modulus value of Comparative Examples 2 and 4 was adjusted to 300 kgf/mm ² or less, whereas Comparative Examples 1 and 3 showed an excessively high modulus value. This indicates that the bonding film to which the high refractive layer according to the embodiment is applied may have a modulus adjusted to be suitable for the winding process while the refractive index is maintained within a certain range.

In Table 2, the specimens of Examples and Comparative Examples were all judged as pass in the evaluation of bonding force. Further, Examples 1 to 3 showed a plasticizer absorption rate of 2% or less, whereas Comparative Examples 2 to 4 exhibited more than 2%. It can be seen that, in the bonding film to which the high refractive index layer according to the embodiment is applied, the refractive index fluctuation of the high refractive index layer is suppressed and the plasticizer absorption rate is controlled below a certain standard without a decrease in bonding strength between the base layer and the high refractive index layer.

Although the preferred embodiment has been described in detail above, the scope of the present invention is not limited thereto, and various modifications and improvements by those skilled in the art using the basic concept of the embodiment defined in the following claims are also within the scope of the present invention. will belong

100: bonding film
10: high refractive layer 20: base layer
Dw: the width direction of the bonding film
H: HUD area
d1: first point d2: second point d3: third point d4: fourth point
L1: 1st line L2: 2nd line
W: The angle between the first line and the second line

Claims (10)

A high refractive index layer comprising a thiourethane-based repeating unit,
The high refractive layer has a refractive index of 1.5 or more, and a modulus of 300 kgf/mm ² or less,
Further comprising a base layer located on one surface of the high refractive index layer,
A value obtained by subtracting the refractive index value of the base layer from the refractive index value of the high refractive layer is 0.02 or more,
A value obtained by subtracting the modulus value of the base layer from the modulus value of the high refractive layer is 0.1 to 299 kgf/mm ² , the bonding film.
delete delete A high refractive index layer comprising a thiourethane-based repeating unit,
The high refractive layer has a refractive index of 1.5 or more, and a modulus of 300 kgf/mm ² or less,
Further comprising a base layer located on one surface of the high refractive index layer,
A value obtained by subtracting the refractive index value of the base layer from the refractive index value of the high refractive layer is 0.02 or more,
The bonding strength of the base layer and the high refractive layer is 8 kgf / cm or more, the bonding film.
According to claim 1,
The high refractive index layer contains 15 to 35% by weight of sulfur atoms, bonding film.
A high refractive index layer comprising a thiourethane-based repeating unit,
The high refractive layer has a refractive index of 1.5 or more, and a modulus of 300 kgf/mm ² or less,
The high refractive index layer is a bonding film comprising a repeating unit containing alkanediyl having 5 to 9 carbon atoms.
According to claim 1,
The bonding film includes a HUD region having a double image formation prevention function,
The high refractive index layer includes one surface and the other surface facing the one surface,
In the HUD region, at least a portion of the one surface and the other surface are not parallel, the bonding film.
As a bonding film,
A high refractive index layer comprising a thiourethane-based repeating unit,
The high refractive layer has a refractive index of 1.5 or more, and a modulus of 300 kgf/mm ² or less,
The bonding film includes a HUD region having a double image formation prevention function,
The high refractive index layer includes one surface and the other surface facing the one surface,
In the HUD region, at least a portion of the one surface and the other surface are not parallel,
The high refractive layer includes first and third points located on the one surface and second and fourth points located on the other surface in the HUD region,
The third point is located 1 cm apart from the first point in the width direction of the bonding film,
The first point and the second point are located on the same line in the thickness direction of the bonding film,
The third point and the fourth point are located on the same line in the thickness direction of the bonding film,
An extension line passing through the first point and the third point is a first line,
An extension line passing through the second point and the fourth point is a second line,
An angle between the first line and the second line at the point of contact between the first line and the second line is W;
The W is a constant or non-constant value in the HUD region of 0.01 to 1.2 degrees, the bonding film.
A high refractive index layer comprising a thiourethane-based repeating unit; and a base layer positioned on one surface of the high refractive index layer and including a plasticizer;
The high refractive layer has a refractive index of 1.5 or more,
In the high refractive index layer, the plasticizer absorption amount is less than 3% of the weight of the high refractive index layer, the bonding film.
a first light-transmitting layer; The bonding film according to claim 1, 4, 6, 8 or 9, which is located on one surface of the first light-transmitting layer; and a second light-transmitting layer positioned on the bonding film.

Images