KR20200105064A - High-durability optical film attaching pad for display - Google Patents

Abstract

The present invention relates to an optical film attachment pad for a display having high durability and, more specifically, to an optical film attachment pad for a display, comprising: a) a PET film layer; b) a self-adhesive layer formed on a surface of the PET film layer; and c) a protective film layer formed on a surface of the self-adhesive layer, wherein the self-adhesive layer comprises: polyurethane (PU) or thermoplastic polyurethane (TPU); modified silicone; and a metal complex compound ion conductive material. In addition, the optical film attachment pad for a display having high durability can prevent damage caused by static electricity by configuring an attachment pad using an ion conductive material to stably absorb and discharge static electricity as a structure without forming a foamed resin layer, is adjusted to keep the adsorption force using self-adhesive constantly and repeatedly, and has remarkably reinforced durability compared to a conventional attachment pad by minimizing changes in the abrasion properties and mechanical properties of the attachment pad when repeatedly used.

Description

High-durability optical film attaching pad for display

The present invention relates to an optical film attachment pad for a display having a high durability, and more particularly, as a structure without forming a foam resin layer, the attachment pad using an ion conductive material is constructed to stably absorb and discharge static electricity. Damage can be prevented, and the adsorption force using self-adhesive has been adjusted to keep constant and repeated, and a modified self-adhesive layer is configured to minimize the change in the abrasion and mechanical properties of the attachment pad when repeatedly used, resulting in durability compared to the conventional attachment pad. It relates to an optical film attachment pad for a display having a remarkably enhanced high durability.

The content described below merely provides background information related to the present invention and does not constitute the prior art.

In general, various types of films are used in display products. Examples of specific optical films include those using a film in which a light diffusing agent is dispersed in a film substrate made of a light-transmitting resin such as polymethyl methacrylate resin and polycarbonate resin, polymethacrylate resin, polycarbonate resin, polymethylmethacrylate An optical film in which the surface of a film substrate made of a light-transmitting resin such as a acrylate resin is directly uneven, and a light diffusion layer is formed by applying a composition obtained by mixing and dispersing a diffusion agent in a light-transmitting resin on the film substrate. As a retardation plate, a viewing angle enlargement film for improving the viewing angle of a liquid crystal display, a luminance enhancing film for increasing the contrast of the display, and a polarizing film equipped with a polarizing element are known, and these films are collectively referred to as an optical film.

A conventional optical film attaching apparatus is provided with an optical film attaching roller (hereinafter referred to as a drum) for attaching the optical film to the surface of the substrate while rotating relative to the display substrate.

As a specific example, in Korean Patent Registration No. 10-0846323, the polarizing plate attachment apparatus of the present invention includes: a supply unit for supplying a polarizing plate; And a drum in which the polarizing plate supplied from the supply unit is adsorbed to the outer surface, and includes an attachment unit for attaching the polarizing plate to the surface of the substrate based on the rotation of the drum, and in at least a portion of the outer surface of the drum, the outer surface of the drum A pressure-sensitive adhesive coating layer is formed that doubles the adsorption power of the polarizing plate against. According to the above invention, it is possible to prevent the occurrence of an error in the process due to a gap that may exist between the drum and the polarizing plate, and the end of the polarizing plate is curled up without being completely in close contact with the outer surface of the drum. It is described that the occurrence of the Curl) phenomenon can be prevented, and as a result, the quality of the substrate to which the polarizing plate is attached can be prevented from deteriorating.

In addition, in Korean Patent Publication No. 10-2013-0025033, there is provided an optical film attachment pad installed on the outer surface of a rotating drum to adsorb the optical film supplied from the optical film supply unit to attach the optical film to the surface of the display substrate, Air discharge and antistatic patterns are formed on the optical film adsorption surface of the pad, and the air between the optical film and the pad is discharged along the air discharge groove in the pattern in the direction of drum rotation, and occurs when the optical film is adsorbed or attached to the display substrate. A pad for attaching an optical film is characterized in that static electricity is absorbed by a pattern containing an electrically conductive material and discharged along a ground line installed at the edge of the pattern. According to the present invention, the air between the optical film and the pad is naturally discharged along the air discharge groove of the pattern when the drum is rotated, so that the non-adhered part of the optical film does not occur on the display substrate due to bubbles, and is evenly attached, and when the optical film is adsorbed or It is described that it is possible to absorb static electricity generated when the display substrate is attached to a pattern having electrical conductivity and discharge it to the outside along an electrically conductive tape installed at the edge of the pattern and a ground line, thereby preventing damage caused by static electricity.

In addition, Korean Patent Publication No. 10-2012-0136279 provides an adsorption sheet that does not cause wrinkles or peeling even when used for a long period in an environment having a bent portion. The adsorption sheet according to the present invention includes a foam resin layer made of an acrylic foam resin, and at least one PET film substrate layer laminated on the back surface of the foam resin layer, and the PET film substrate layer opposite to the foam resin layer It characterized in that it has an adhesive layer made of an acrylic adhesive laminated on the surface of.

When the adsorption sheet passes through the bent portion, a tensile force is applied, and as the tensile force is deflected within the adsorption sheet, wrinkles or peeling occur. Since there are a plurality of products with different film composition, material, or sheet thickness depending on the type, grade, and added performance of an object to be conveyed, such as a polarizing film, the adhesive device side also adjusts the thickness or strength of the entire multilayer adsorption sheet to provide each product. It is necessary to optimize the adsorption power, adsorption pressure, and transport properties. However, if the thickness of the entire multilayer adsorption sheet is controlled using only the PET film base layer, the rigidity, which is a characteristic of the PET film, is affected, and the strength of the multilayer adsorption sheet itself becomes too strong, resulting in impaired followability to the bent portion.

Conventionally, the adhesion pad of the above inventions consumes antistatic pattern process and cost, and in the case of multi-layer adsorption sheet, it is a cause of increase in process cost and cost when laminating into multiple layers. If a printing process is required to control adsorption power, the cost increases as well. It causes. In addition, due to repeated use, the reliability of the mechanical properties is degraded due to a large amount of wear, and the shape of the foamed resin layer is deformed, causing a problem in optimizing the adsorption power and adsorption pressure, and the adhesive strength significantly decreases in a short period of time, resulting in the inconvenience of frequent replacement of the attachment pad. , There is an urgent need for a durable attachment pad.

Patent Document 1: Korean Patent Registration No. 10-0846323 (2008.07.09.) Patent Document 2: Korean Patent Publication No. 10-2013-0025033 (2013.01.11.) Patent Document 3: Korean Patent Publication No. 10-2012-0136279 (2012.12.18)

The present invention is to solve the above-described problems, and as a structure in which a foam resin layer is not formed, by configuring an attachment pad using an ion conductive material to stably absorb and discharge static electricity, damage caused by static electricity can be prevented, and self-adhesive It was controlled to keep the adsorption force constant and repeated, and a modified self-adhesive layer was constructed to minimize the change in the abrasion properties and mechanical properties of the attachment pad during repeated use, so that the durability was remarkably enhanced compared to the conventional attachment pad. It is an object to provide an optical film attachment pad.

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

The present invention for solving these technical problems

a) PET film layer 100;

b) self-adhesive layer 200; And

c) a protective film layer 300;

Including,

The self-adhesive layer 200 may include polyurethane (PU) or thermoplastic polyurethane (TPU); Modified silicone; And it provides a display optical film attachment pad 10, characterized in that it comprises a metal complex compound ion conductive material.

The modified silicone is modified with a silane compound containing at least one selected from the group consisting of an epoxy group, an isocyanate group, a hydroxy group and an amino group based on polydimethylsiloxane (PDMS).

Preferably, the silane compound is one of those represented by the following formulas 1 to 4:

[Formula 1]

[Formula 2]

[Formula 3]

[Formula 4]

In Formulas 1 to 4,

'-' connected to Si is a hydrogen, alkyl group, aryl group, amine group, halogen or alkylhalogen bonded,

’는 수소, 알킬기, 아릴기, 아민기, 할로겐 또는 알킬할로겐이 각각 독립적으로 3개 결합된 것이며,Connected to Si'

'Is hydrogen, an alkyl group, an aryl group, an amine group, a halogen or an alkylhalogen each independently bonded to three,

R is an alkyl group, an aryl group, or a divalent linking group derived from an alkylhalogen,

n is an integer from 1 to 1,000.

The self-adhesive layer 200 includes 100 parts by weight of the polyurethane (PU) or thermoplastic polyurethane (TPU); 10 to 20 parts by weight of the modified silicone; 5 to 10 parts by weight of the metal complex compound ion conductive material.

A pattern portion is formed on the surface of the self-adhesive layer 200 that is bonded to the protective film layer 300.

The attachment pad 10 is

a) PET film layer (100) 2 to 200 um;

b) self-adhesive layer 200 50 to 300 um; And

c) The protective film layer 300 has a thickness of 5 to 300 um.

According to the present invention, the adhesive pad is configured to stably absorb and discharge static electricity as a structure in which a foam resin layer is not formed, so that damage caused by static electricity can be prevented, and by configuring a modified self-adhesive layer, the abrasion resistance and mechanical properties of the adhesive pad when repeated use By minimizing the change in physical properties, it is possible to provide an optical film attachment pad for a display having a high durability with remarkably reinforced durability compared to a conventional attachment pad.

1 is a view showing an optical film attachment pad for a display having a high durability according to an embodiment of the present invention.
2 is a comparative test result of abrasion resistance using an optical film attachment pad for a display having a high durability and a conventional acrylic attachment pad according to an embodiment of the present invention.
3 is a result of a comparative test of adhesion according to repeated use using an optical film attachment pad for a display having high durability and a conventional acrylic attachment pad according to an embodiment of the present invention.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings. In describing the present invention, if it is determined that a detailed description of a related known function or configuration may unnecessarily obscure the subject matter of the present invention, a detailed description thereof will be omitted. In addition, terms used in the present specification are terms used to properly express a preferred embodiment of the present invention, which may vary depending on the intention of users or operators, or customs in the field to which the present invention belongs. Accordingly, definitions of these terms should be made based on the contents throughout the present specification. The same reference numerals in each drawing indicate the same members.

Throughout the specification, when a member is said to be positioned "on" another member, this includes not only the case where a member is in contact with another member, but also the case where another member exists between the two members.

Throughout the specification, when a part "includes" a certain component, it means that other components may be further included rather than excluding other components.

The optical film attachment pad for a display according to the present invention is installed on the outer circumferential surface of the rotating drum as in Patent Documents 1, 2 and 3 to adsorb the optical film supplied from the optical film supply unit to attach the optical film to the surface of the display substrate. It is a pad for attaching an optical film to be attached, and the contents described in Korean Patent Laid-Open No. 10-2012-0136279 may be applied mutatis mutandis that there is no special mention in the present invention.

1 is a view showing an optical film attachment pad 10 for a display having high durability according to an embodiment of the present invention.

The optical film attachment pad for a display according to the present invention is as shown in FIG.

a) PET film layer 100;

b) a self-adhesive layer 200 formed on the surface of the PET film layer 100; And

c) a protective film layer 300 formed on the surface of the self-adhesive layer 200;

Including,

The self-adhesive layer 200 may include polyurethane (PU) or thermoplastic polyurethane (TPU); Modified silicone; And it characterized in that it comprises a metal complex compound ion conductive material.

If necessary, a pattern portion, such as embossing or honeycomb shape, may be formed on the surface of the self-adhesive layer 200 that is bonded to the protective film layer 300.

The optical film attachment pad 10 for a display according to the present invention coats the components constituting the self-adhesive layer 200 on the surface of the PET film 100, and the protective film 300 on the surface of the self-adhesive layer 200 ) Can be prepared by combining.

In the present invention, the a) PET film layer 100 may be a known PET film that can be used for an adhesion pad. The thickness of the PET film layer 100 may be arbitrarily adjusted, and as a specific example, a film having a thickness of 5 to 200 um may be used.

In the present invention, the b) self-adhesive layer 200 is formed on the surface of the PET film, and the formation method is not particularly limited, and a specific example may be formed by coating an adhesive component on the surface of the PET film. The thickness of the self-adhesive layer 200 may be arbitrarily adjusted, and a specific example may be 50 to 300 um.

The self-adhesive layer 200 may include polyurethane (PU) or thermoplastic polyurethane (TPU); Modified silicone; And a metal complex compound ion conductive material.

As the polyurethane (PU) or thermoplastic polyurethane (TPU), polyurethane (PU) or thermoplastic polyurethane (TPU) used in a known adhesive may be used, and as a specific example, a polyester type and a polyether type may be used. In addition, as the isocyanate, both aliphatic and aromatic isocyanates can be used. Preferably, thermoplastic polyurethane (TPU) is used. In this case, the durability of the attachment pad 10 can be further improved.

Preferably, the modified silicone is modified with a silane compound containing at least one selected from the group consisting of an epoxy group, an isocyanate group, a hydroxy group, and an amino group based on polydimethylsiloxane (PDMS).

Specifically, the silane compound is one of the formulas 1 to 4:

[Formula 1]

[Formula 2]

[Formula 3]

[Formula 4]

In Formulas 1 to 4,

'-' connected to Si is a hydrogen, alkyl group, aryl group, amine group, halogen or alkylhalogen bonded,

’는 수소, 알킬기, 아릴기, 아민기, 할로겐 또는 알킬할로겐이 각각 독립적으로 3개 결합된 것이며,Connected to Si'

'Is hydrogen, an alkyl group, an aryl group, an amine group, a halogen or an alkylhalogen each independently bonded to three,

R is an alkyl group, an aryl group, or a divalent linking group derived from an alkylhalogen,

n is an integer from 1 to 1,000.

In this case, since the amount of abrasion of the attachment pad 10 is small during repeated use, the reliability for mechanical properties is excellent, and it is easy to maintain a certain adhesive strength during repeated use, and durability can be remarkably enhanced compared to the conventional attachment pad.

The metal complex compound ion conductive material may be preferably a colorless material having good compatibility with the adhesive layer, and a specific example may be a metal imidazolinium salt or a tetraalkylammonium salt, and diluted with a solvent as necessary. Can be used. The solvent is not particularly limited as long as it can dissolve the metal complex ion conductive material, and specific examples may include toluene, methyl ethyl ketone, alcohol, and the like.

Preferably, the self-adhesive layer 200 includes 100 parts by weight of the polyurethane (PU) or thermoplastic polyurethane (TPU); 10 to 20 parts by weight of the modified silicone; 5 to 10 parts by weight of the metal complex compound ion conductive material. If it is within the above range, the modified silicon and the metal complex ion conductive material are evenly distributed throughout the attachment pad 10, so that the attachment pad 10 is configured to stably absorb and discharge static electricity even by partial abrasion due to repeated use. Damage caused by it can be prevented, and when repeatedly used, abrasion resistance and mechanical properties are excellent, and since it is easy to maintain a certain adhesive force, it is possible to provide an attachment pad with remarkably reinforced durability compared to a conventional attachment pad.

In the present invention, c) the protective film layer 300 is formed on the surface of the self-adhesive layer 200, and serves to prevent the self-adhesive layer 200 from being contaminated. The material of the protective film 300 is not particularly limited, and is removed from the self-adhesive layer 200 when the attachment pad 10 is used. As a specific example, the protective film layer 300 may be a PET film subjected to silicon release or fluorine release treatment, and may have a thickness of 5 um to 300 um.

In the optical film attachment pad 10 for a display according to the present invention, the modified silicon and the metal complex ion conductive material are evenly distributed throughout the attachment pad, so that the attachment pad is stably absorbed and discharged even by partial wear caused by repeated use. It can be configured to prevent damage due to static electricity. In particular, the physical properties requested from the optical film attachment pad for display, adhesive strength of 0.2±0.03 N/mm, tensile strength of 2.5 kgf/cm ² or more, and charging of 10 ⁸ Ω/cm or less The prevention performance is maintained even at 40,000 repetitions, so when repeatedly used, the abrasion resistance and mechanical properties of the attachment pad are excellent, and the reliability is excellent, and when repeatedly used, it is easy to maintain a constant adhesive force, so that the attachment pad is remarkably enhanced in durability compared to the conventional attachment pad. Can provide.

Hereinafter, examples will be described in detail to illustrate the present invention in detail. However, the embodiments according to the present invention may be modified in various forms, and the scope of the present invention should not be construed as being limited to the embodiments described below. Embodiments of the present invention are provided to more completely describe the present invention to those of ordinary skill in the art.

[Example 1]

In the shape as shown in Figure 1 a) PET film layer 100 um; b) 150 um of self-adhesive layer; And c) a protective film layer 150 um; to prepare an optical film attachment pad for a display. The self-adhesive layer is 100 parts by weight of TPU; 10 to modified silicone modified with a silane compound containing at least one selected from the group consisting of an epoxy group, an isocyanate group, a hydroxy group, and an amino group based on polydimethylsiloxane (PDMS). 20 parts by weight; And 5 to 10 parts by weight of a metal complex compound ion conductive material.

[Example 2]

An optical film attachment pad for a display was prepared in the same manner as in Example 1, except that an optical film attachment pad for a display was prepared in the same manner as in Example 1, but PU was used instead of TPU.

[Comparative Example 1]

An optical film attachment pad for a display was prepared in the same manner as in Example 1, except that the modified silicon and the metal complex ion conductive material were not used in Example 2.

Abrasion resistance comparison test and adhesion comparison test were performed on the optical film attachment pads for display of Example 1 and Comparative Example 1, respectively, and are shown in FIGS. 3 and 4, respectively.

The abrasion resistance test was performed by testing the abrasion resistance at a speed of 60-70 rpm at room temperature of 25° C. at room temperature of 10, 100, and 200 gf, respectively, according to ASTM D7027, and the degree of wear of the specimen was measured by weight.

The adhesion test was performed by compressing a 100×100 mm ² specimen at room temperature of 25° C. on a polarizing protective film with a weight of 2 kg at a constant pressure, and then pulling it at a speed of 300 mm/min at 180 degrees to check the adhesion.

As shown in FIG. 2, it can be seen that the optical film attachment pad for a display according to the present invention has significantly reduced abrasion due to repeated use compared to the attachment pad of the comparative example, and thus has excellent reliability in mechanical properties.

In addition, as shown in Fig. 3, it can be confirmed that the lifespan of the adhesive pad of the comparative example is about 20,000 times by significantly deviating from the adhesive force of 0.2±0.03 N/mm requested by the attachment pad after 20000 times of use. Even when the film attachment pad is repeatedly used more than 40000 times, it can be confirmed that the lifespan is more than 40000 times because it has an adhesive strength equal to the initial adhesive strength, and it can be confirmed that the durability is remarkably excellent compared to the attachment pad of the comparative example.

Although the embodiments have been described by the limited embodiments and drawings as described above, various modifications and variations are possible from the above description to those of ordinary skill in the art. For example, even if the described techniques are performed in a different order from the described method, and/or the described components are combined or combined in a form different from the described method, or are replaced or substituted by other components or equivalents. Appropriate results can be achieved. Therefore, other implementations, other embodiments, and claims and equivalents fall within the scope of the claims to be described later.

Claims (6)

a) PET film layer 100;
b) a self-adhesive layer 200 formed on the surface of the PET film layer; And
c) a protective film layer 300 formed on the surface of the self-adhesive layer;
Including,
The self-adhesive layer 200 may include polyurethane (PU) or thermoplastic polyurethane (TPU); Modified silicone; And a metal complex compound ion conductive material. The method of claim 1,
The modified silicone is modified with a silane compound containing at least one selected from the group consisting of an epoxy group, an isocyanate group, a hydroxy group and an amino group based on polydimethylsiloxane (PDMS). The method of claim 2,
The silane compound is an optical film attachment pad for a display, characterized in that one of those represented by the following Chemical Formulas 1 to 4:
[Formula 1]

[Formula 2]

[Formula 3]

[Formula 4]

In Formulas 1 to 4,
'-' linked to Si is a hydrogen, alkyl group, aryl group, amine group, halogen or alkylhalogen bonded,
Connected to Si'

'Is hydrogen, an alkyl group, an aryl group, an amine group, a halogen or an alkylhalogen each independently bonded to three,
R is an alkyl group, an aryl group, or a divalent linking group derived from an alkylhalogen,
n is an integer from 1 to 1,000. The method of claim 1,
The self-adhesive layer 200 includes 100 parts by weight of the polyurethane (PU) or thermoplastic polyurethane (TPU); 10 to 20 parts by weight of the modified silicone; 5 to 10 parts by weight of the metal complex compound ion conductive material. An optical film attachment pad for a display comprising: a. The method of claim 1,
An optical film attachment pad for a display, characterized in that a pattern portion is formed on the surface of the self-adhesive layer 200 and the protective film layer 300 and the surface. The method of claim 1,
The attachment pad 10 is
a) PET film layer (100) 2 to 200 um;
b) self-adhesive layer 200 50 to 300 um; And
c) Protective film layer 300 Optical film attachment pad for display, characterized in that it has a thickness of 5 to 300 um.

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