KR20170000036A - Adhesive sheet for optical use - Google Patents

Adhesive sheet for optical use Download PDF

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Publication number
KR20170000036A
KR20170000036A KR1020150088523A KR20150088523A KR20170000036A KR 20170000036 A KR20170000036 A KR 20170000036A KR 1020150088523 A KR1020150088523 A KR 1020150088523A KR 20150088523 A KR20150088523 A KR 20150088523A KR 20170000036 A KR20170000036 A KR 20170000036A
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KR
South Korea
Prior art keywords
layer
sensitive adhesive
pressure
light
surface energy
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KR1020150088523A
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Korean (ko)
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KR101988076B1 (en
Inventor
장애정
최홍준
김장순
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주식회사 엘지화학
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Priority to KR1020150088523A priority Critical patent/KR101988076B1/en
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    • C09J7/026—
    • C09J7/0225—
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B5/00—Optical elements other than lenses
    • G02B5/20—Filters

Abstract

TECHNICAL FIELD The present invention relates to an optical adhesive sheet, and more particularly, to an optical adhesive sheet having improved adhesion between a base film and a pressure-sensitive adhesive layer.

Description

ADHESIVE SHEET FOR OPTICAL USE

TECHNICAL FIELD The present invention relates to an optical adhesive sheet, and more particularly, to an optical adhesive sheet having improved adhesion between a base film and a pressure-sensitive adhesive layer.

In general, an LCD (Liquid Crystal Display) is composed of an LCD panel equipped with a display unit for displaying an image and a backlight unit for reflecting light from the back of the LCD panel. The upper portion of the LCD panel and the backlight unit are adhered And is attached and fixed by a sheet.

Such a pressure sensitive adhesive sheet is produced by forming a black ink coating layer on a base film such as a polyethylene terephthalate film. At this time, in addition to the function of attaching the LCD panel and the backlight unit, it is also possible to prevent dust from intruding from the outside, And it serves to prevent damage due to the impact due to the elasticity.

When the adhesion between the base film and the pressure-sensitive adhesive layer is deteriorated in such a pressure-sensitive adhesive sheet, when the liner formed on the pressure-sensitive adhesive layer is peeled off, not only the liner is peeled off but also peeling may occur between the base film and the pressure- Problems such as an increase in manufacturing cost due to loss and a decrease in process efficiency may occur.

An object of the present invention is to provide an optical adhesive sheet for optical use which can improve adhesion between a base film and a pressure-sensitive adhesive layer to prevent peeling between a base film and a pressure-sensitive adhesive layer.

According to an aspect of the present invention, a light-shielding printing layer is formed on at least one surface of a base film, a pressure-sensitive adhesive layer is formed on the light-blocking printing layer, and a surface energy of the light- / m to 60 mN / m can be provided.

In one embodiment, the surface energy of the light-blocking printing layer and the surface energy of the pressure-sensitive adhesive layer in contact with the light-shielding layer printing layer satisfy the following expression (1).

[Formula 1]

(MN / m) - 10 mN / m? Surface energy of the light-blocking printing layer (mN / m)? Surface energy of the pressure-sensitive adhesive layer (mN / m) + 10 mN / m

In one embodiment, the surface energy of the pressure-sensitive adhesive layer in contact with the light-shielding print layer is in the range of 40 mN / m to 60 mN / m.

In one embodiment, the thickness of the light-shielding print layer is 2 to 6 占 퐉.

In one embodiment, the light-shielding print layer is laminated with at least two sub-print layers having a thickness of 1 to 3 μm.

In one embodiment, a first sub-print layer having a thickness of 1 to 3 m is formed on at least one side of the base film, and a second sub-print having a thickness of 1 to 3 m on the first sub- And a pressure-sensitive adhesive layer is formed on the second sub printable layer.

In one embodiment, the thicknesses of the first sub print layer and the second sub print layer are the same.

In one embodiment, the surface energy of the first sub-print layer is in the range of 40 mN / m to 50 mN / m and the surface energy of the second sub-print layer is in the range of 50 mN / m to 60 mN / m Within the range.

In one embodiment, the light-shielding print layer comprises a black filler.

In one embodiment, when a force of 4 kg is applied at 25 DEG C for one hour, the distance the pressure-sensitive adhesive layer is pressed against the light-shielding print layer is 0.1 mm or less.

In one embodiment, a release layer is formed on the pressure-sensitive adhesive layer, and the surface energy of the release layer contacting the pressure-sensitive adhesive layer is smaller than the surface energy of the light-blocking print layer in contact with the pressure-sensitive adhesive layer.

In one embodiment, the surface energy of the release layer in contact with the pressure-sensitive adhesive layer is less than 40 mN / m.

According to one embodiment of the present invention, adhesion between the base film and the pressure-sensitive adhesive layer can be improved to prevent peeling between the base film and the pressure-sensitive adhesive layer, so that defects in the product, increase in manufacturing cost due to loss of raw materials, And the like can be solved.

1 is a vertical sectional view of an optical adhesive sheet according to an embodiment of the present invention.

Certain terms are hereby defined for convenience in order to facilitate a better understanding of the present invention. Unless otherwise defined herein, scientific and technical terms used in the present invention shall have the meanings commonly understood by one of ordinary skill in the art. Also, unless the context clearly indicates otherwise, the singular form of the term also includes plural forms thereof, and plural forms of the term should be understood as including its singular form.

Hereinafter, the optical adhesive sheet according to one embodiment of the present invention will be described in more detail.

1 showing an optical adhesive sheet according to an embodiment of the present invention, a light-shielding printing layer 200 and a pressure-sensitive adhesive layer 300 are laminated on a base film 100.

1 has a structure in which the light blocking printing layer 200 and the pressure sensitive adhesive layer 300 are formed on only one side of the base film 100. However, The adhesive layer may be formed on the other side of the base film 100 on which the light blocking printing layer 200 is not formed and on the light blocking printing layer 200. [

In another modification, the optical adhesive sheet in which the light-shielding printing layer 200 is formed on both sides of the base film 100 and the pressure-sensitive adhesive layer 300 is formed on the light-blocking printing layer 200, . ≪ / RTI >

Here, as the base film 100, a film excellent in transparency, mechanical strength, thermal stability, moisture barrier property and isotropy can be used.

Examples of the base film 100 include polyester resins such as polyethylene terephthalate, polyethylene isophthalate, polyethylene naphthalate and polybutylene terephthalate; Cellulose-based resins such as diacetylcellulose and triacetylcellulose; Polycarbonate resin; Acrylic resins such as polymethyl (meth) acrylate and polyethyl (meth) acrylate; Styrene resins such as polystyrene and acrylonitrile-styrene copolymer; Polyolefin resins such as polyethylene, polypropylene, cyclo- or norbornene-structured polyolefins, ethylene-propylene copolymers; Vinyl chloride resin; Amide resins such as nylon and aromatic polyamide; Imide resin; Sulfone based resin; Polyether sulfone type resin; Polyether ether ketone resin; A sulfided polyphenylene resin; Vinyl alcohol type resin; Vinylidene chloride resins; Vinyl butyral resin; Allylate series resin; Polyoxymethylene type resin; And a film formed from a thermoplastic resin such as epoxy resin.

The thickness of the base film 100 may be 20 to 100 占 퐉, but is not limited thereto, and may be appropriately adjusted depending on the use and the like. The thickness of the base film 100 is determined by the adhesion between the base film 100 and the pressure-sensitive adhesive layer 300 (more specifically, between the light-blocking printing layer 200 formed on the base film 100 and the pressure- Adhesion).

The light blocking printing layer 200 is a layer which functions to block light and is formed on at least one surface of the base film 100 as described above.

At this time, the surface of the base film 100 may be corona discharge treated or treated with a primer containing a reactive low-molecular compound to form a light-shielding printing layer 200 after a certain level of surface roughness is formed. Here, the corona discharge treatment may be performed for 0.5 to 1 second with a high frequency power source of 0.4 to 1.5 kW.

The surface roughness of a certain level formed on the surface of the base film 100 can improve the adhesion between the base film 100 and the light blocking print layer 200 and improve properties such as adhesion strength and durability of the pressure sensitive adhesive sheet .

The light blocking printing layer 200 may be formed by printing on at least one side of the base film 100 with an ink containing a black filler such as carbon black. With this light-shielding printing layer 200, for example, light of about 90% or more can be blocked without being transmitted. Further, the light-blocking printing layer 200 may further include pigments other than black filler as required.

The light blocking printing layer 200 is formed on at least one surface of the base film 100 so as to have a thickness of 2 to 6 占 퐉. At this time, the light-shielding print layer 200 may have at least two sub-print layers having a thickness of 1 to 3 mu m, and the sub print layers may be laminated to the same or different thicknesses.

However, in consideration of the simplicity and economy of the process of forming the print layer on the base film 200, it is preferable that the plurality of sub print layers are laminated to have the same thickness.

In this case, it is preferable that the sub print layer is formed so as to satisfy the range of the surface energy to be described later.

The thickness of the light blocking printing layer 200 is preferably 6 占 퐉 or less. It is preferable that the light blocking printing layer 200 is formed as a single layer and the thickness thereof is more than 6 占 퐉 or the light blocking printing layer 200 is formed as at least two layers. When the total thickness exceeds 6 占 퐉, There is a problem that the process unit price is unnecessarily increased.

For example, when the light-blocking printing layer 200 is formed of two layers, a first sub print layer 201 having a thickness of 1 to 3 μm is formed on at least one surface of the base film 100, It is preferable that the second sub print layer 202 having a thickness of 1 to 3 m is formed on the sub print layer 201. [

The surface energy of the light-blocking printing layer 200 is preferably in the range of 40 mN / m or more, and more preferably in the range of 40 mN / m to 60 mN / m.

The surface energy of the light blocking printing layer 200 means the upper surface energy of the light blocking printing layer 200 in contact with the pressure sensitive adhesive layer 300.

Similarly, the surface energy of the pressure-sensitive adhesive layer 300 in contact with the light-shielding print layer 200 is preferably in the range of 40 mN / m or more, and more preferably in the range of 40 mN / m to 60 mN / m.

When the surface energy of the light blocking printing layer 200 contacting the pressure sensitive adhesive layer 300 and / or the surface energy of the pressure sensitive adhesive layer 300 contacting the light blocking printing layer 200 is less than 40 mN / m, 200 and the pressure-sensitive adhesive layer 300 are low, the possibility of peeling at the interface between the light-shielding printing layer 200 and the pressure-sensitive adhesive layer 300 at the time of peeling is increased.

When the light blocking printing layer 200 is formed on the base film 100 so as to have a surface energy in the range of 40 mN / m to 60 mN / m, the light blocking printing layer 200 and the pressure sensitive adhesive layer 300 Can be further improved.

In a specific embodiment, the surface energy of the light-blocking print layer 200 in contact with the pressure-sensitive adhesive layer 300 is preferably formed so as to have a surface energy derived from the following equation (1).

[Formula 1]

(MN / m) - 10 mN / m? Surface energy of the light-blocking printing layer (mN / m)? Surface energy of the pressure-sensitive adhesive layer (mN / m) + 10 mN / m

The surface energy of the light blocking print layer 200 is controlled within a range of ± 10 mN / m of the surface energy of the pressure sensitive adhesive layer 300 in contact with the light blocking print layer 200, so that the adhesion between the light blocking print layer 200 and the pressure sensitive adhesive layer 300 Can be maintained excellent.

If the surface energy of the light-shielding print layer 200 is excessively larger or smaller than the surface energy of the pressure-sensitive adhesive layer 300 in contact therewith, complete adhesion may not be achieved or the pressure-sensitive adhesive layer 300 may become injured.

That is, an excessive difference in surface energy between the light-blocking printing layer 200 and the pressure-sensitive adhesive layer 300 may cause peeling of the pressure-sensitive adhesive layer 300.

In another modification, the first sub print layer 201 is formed on at least one surface of the base film 100, the second sub print layer 202 is formed on the first sub print layer 201, The surface energy of the first sub print layer 201 is in the range of 40 mN / m to 50 mN / m when the pressure sensitive adhesive layer 300 is formed on the second sub print layer 202, 202 has a surface energy in the range of 50 mN / m to 60 mN / m.

At this time, the surface energy of the pressure-sensitive adhesive layer 300 in contact with the second sub-print layer 202 of the light-shielding print layer 200 preferably has a surface energy of 50 mN / m to 60 mN / m.

In addition, when the pressure sensitive adhesive sheet for an optical sheet according to an embodiment of the present invention is applied with a force of 4 kg at 25 ° C for 1 hour, the distance that the pressure sensitive adhesive layer 300 is pressed against the light shielding print layer 200 is 0.1 mm or less And is preferably in the range of 0.05 mm to 0.09 mm.

The pushing distance of the pressure-sensitive adhesive layer (300) is within the above-mentioned range, so that it is possible to reduce the retardation phenomenon caused by the stress acting on the pressure-sensitive adhesive. If the pushing distance is less than 0.05 mm, the durability and reliability of the pressure-sensitive adhesive layer 300 may deteriorate.

In another embodiment, a release layer for protecting the pressure-sensitive adhesive layer 300 is formed on the pressure-sensitive adhesive layer 300, and the release layer can be formed of various kinds of films usable as a release film.

Examples of such release films are polyethylene, polypropylene, poly-1-butene, poly-4-methyl-1-pentene, ethylene-propylene copolymers, ethylene-1-butene copolymers, ethylene- Ethyl acrylate copolymer, ethylene-vinyl alcohol copolymer, and other polyolefin-based films; Polyester films such as polyethylene terephthalate, polyethylene naphthalate and polybutylene terephthalate; Polyacrylate-based films; A polystyrene type film; Polyamide-based films such as nylon 6 and partially aromatic polyamide; Polyvinyl chloride films; Polyvinylidene chloride films; Or a polycarbonate film.

Here, the surface energy of the release layer in contact with the pressure-sensitive adhesive layer 300 is preferably smaller than the surface energy of the light-blocking print layer 200 in contact with the pressure-sensitive adhesive layer 300.

For example, when the surface energy of the light-blocking print layer 200 in contact with the pressure-sensitive adhesive layer 300 is 40 mN / m or more, the surface energy of the release layer in contact with the pressure-sensitive adhesive layer 300 is preferably less than 40 mN / m .

The adjustment of the surface energy between the respective layers within the above-mentioned range can effectively improve the adhesion between the base film 100 or the light-blocking printing layer 200 and the pressure-sensitive adhesive layer 200, Peeling between the print layer 200 and the pressure-sensitive adhesive layer 300 can be prevented. Thus, it is possible to solve such problems as defective products, increased manufacturing costs due to loss of raw materials, and lowering of process efficiency.

Hereinafter, specific embodiments of the present invention will be described. However, the embodiments described below are only intended to illustrate or explain the present invention, and thus the present invention should not be limited thereto.

The optical adhesive sheet Manufacturing example

Example  One

A black filler containing carbon black was coated on one side of a polyethylene terephthalate (75 μm) film to form a light-shielding print layer having a thickness of 2 μm, and then an acrylic pressure-sensitive adhesive layer was formed on the light- .

Example  2

A black filler containing carbon black was coated on one side of a polyethylene terephthalate (75 μm) film to form a 2 μm sub-print layer in two layers (total 4 μm thick light-blocking print layer) Sensitive adhesive layer was formed on the layer to prepare an optical pressure-sensitive adhesive sheet.

Example  3

A black filler containing carbon black was coated on one side of a polyethylene terephthalate (75 μm) film to form a sub-print layer of 3 μm thickness in two layers (total 6 μm thick light-blocking print layer) Sensitive adhesive layer was formed on the layer to prepare an optical pressure-sensitive adhesive sheet.

Comparative Example  One

A black filler containing carbon black was coated on one side of a polyethylene terephthalate (75 μm) film to form a light-shielding print layer having a thickness of 1 μm, and then an acrylic pressure-sensitive adhesive layer was formed on the light- .

Comparative Example  2

A black filler containing carbon black was coated on one side of a polyethylene terephthalate (75 μm) film to form a light-shielding print layer having a thickness of 7 μm, and then an acrylic pressure-sensitive adhesive layer was formed on the light- .

Surface energy measurement

The surface energy at the interface between the light-shielding print layer and the pressure-sensitive adhesive layer of the optical pressure-sensitive adhesive sheet prepared in Examples 1 to 3 and Comparative Examples 1 and 2 was measured using a contact angle meter (DSA100, Kruss Co.) And the contact angle was measured and then converted to surface energy (generally, the contact angle and surface energy have opposite values).

Pull distance measurement

When the pressure sensitive adhesive sheet for optical use prepared in Examples 1 to 3 and Comparative Examples 1 and 2 was applied with a force of 4 kg at 25 DEG C for 1 hour, the distance of the pressure sensitive adhesive layer against the light shielding print layer was measured with a Texture analyzer system, model: TA-XT plus).

Interfacial adhesion evaluation

The optical pressure-sensitive adhesive sheets prepared in Examples 1 to 3 and Comparative Examples 1 and 2 were laminated and after 1 hour, the pressure-sensitive adhesive sheet was peeled off with a force of 10 kg, and the amount of the remaining pressure-sensitive adhesive was measured.

<Evaluation Criteria>

○: Residue of adhesive agent 80% or more

DELTA: Adhesive residue amount 30% or more to 80% or less

X: residual amount of the adhesive agent 30% or less

division Example 1 Example 2 Example 3 Comparative Example 1 Comparative Example 2 Surface energy Shading
Printing layer 51.32 54.00 58.07 35.64 63.14 The pressure- 42.67 45.34 51.43 32.21 41.15 Pushing distance (mm) 0.09 0.08 0.08 0.15 0.12 Interface adhesion ○ ○ ○ × △

Surface energy (light-shielding printing layer): Surface energy of the light-shielding printing layer in contact with the adhesive layer

Surface energy (pressure-sensitive adhesive layer): The surface energy of the pressure-sensitive adhesive layer in contact with the light-

As a result of comparing the surface energy, pushing distance and interface adhesion of the adhesive sheets for optical sheets prepared in Examples 1 to 3 and Comparative Examples 1 and 2, it was found that the surface energy was inadequate or in contact with each other When the difference in surface energy between the light-shielding print layer and the adhesive layer is excessively large, it is confirmed that durability and reliability are inferior.

It will be apparent to those skilled in the art that various modifications and variations can be made in the present invention without departing from the spirit of the invention as set forth in the appended claims. The present invention can be variously modified and changed by those skilled in the art, and it is also within the scope of the present invention.

100: substrate film
200: Light blocking printing layer
201: first sub print layer
202: second sub print layer
300: pressure-sensitive adhesive layer

Claims (12)

A light-shielding printing layer is formed on at least one surface of a base film,
A pressure-sensitive adhesive layer is formed on the light-blocking printing layer,
Wherein the surface energy of the light-blocking printing layer in contact with the pressure-sensitive adhesive layer is in the range of 40 mN / m to 60 mN / m.
The method according to claim 1,
Wherein the surface energy of the light-blocking printing layer and the surface energy of the pressure-sensitive adhesive layer in contact with the light-shielding layer printing layer satisfy the following formula 1:

[Formula 1]
(MN / m) - 10 mN / m? Surface energy of the light-blocking printing layer (mN / m)? Surface energy of the pressure-sensitive adhesive layer (mN / m) + 10 mN / m
The method according to claim 1,
Wherein the surface energy of the pressure-sensitive adhesive layer in contact with the light-blocking printing layer is in the range of 40 mN / m to 60 mN / m.
The method according to claim 1,
Wherein the thickness of the light-shielding print layer is 2 to 6 占 퐉.
5. The method of claim 4,
Wherein the light-shielding print layer is formed by laminating at least two sub-print layers having a thickness of 1 to 3 占 퐉.
6. The method of claim 5,
A first sub print layer having a thickness of 1 to 3 m is formed on at least one surface of the base film,
A second sub print layer having a thickness of 1 to 3 m is formed on the first sub print layer,
And an adhesive layer is formed on the second sub printable layer.
The method according to claim 6,
Wherein the first sub print layer and the second sub print layer have the same thickness.
The method according to claim 6,
The surface energy of the first sub-print layer is in the range of 40 mN / m to 50 mN / m,
Wherein the surface energy of the second sub-print layer is in the range of 50 mN / m to 60 mN / m.
The method according to claim 1,
Wherein the light-shielding printing layer comprises a black filler.
The method according to claim 1,
Wherein a distance of pushing the pressure-sensitive adhesive layer to the light-shielding print layer is 0.1 mm or less when a force of 4 kg is applied at 25 DEG C for 1 hour.
The method according to claim 1,
A peeling layer is formed on the pressure-sensitive adhesive layer,
Wherein the surface energy of the peeling layer in contact with the pressure-sensitive adhesive layer is smaller than the surface energy of the light-blocking printing layer in contact with the pressure-sensitive adhesive layer.
12. The method of claim 11,
Wherein the surface energy of the release layer in contact with the pressure-sensitive adhesive layer is less than 40 mN / m.
KR1020150088523A 2015-06-22 2015-06-22 Adhesive sheet for optical use KR101988076B1 (en)

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Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2007084830A (en) * 2006-10-13 2007-04-05 Nitto Denko Corp Adhesive tape
JP2013185148A (en) * 2012-03-12 2013-09-19 Nitto Denko Corp Self-adhesive sheet

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2007084830A (en) * 2006-10-13 2007-04-05 Nitto Denko Corp Adhesive tape
JP2013185148A (en) * 2012-03-12 2013-09-19 Nitto Denko Corp Self-adhesive sheet

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