KR20150126225A - Buffer tape for preventing leakage of light and water and buffer tape for preventing leakage of light - Google Patents

Abstract

Provided is a buffer tape with functions of water resistance and light-leakage prevention, which comprises: a buffer film including a molded polymer foam; a waterproof film including a waterproof polymer with porosity of 1-50%; and a light-shielding layer printed on the waterproof film, disposed within the waterproof film and the buffer film, and containing colored substances.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a buffer tape having a function of preventing light leakage and having a waterproof function and a light-

The present invention relates to a buffer tape having a function of preventing light leakage and having a waterproof function.

Recently, more and more consumers are enjoying surfing the Internet or watching videos using a portable terminal such as a smart phone or a tablet. Accordingly, the size of the display of the portable terminal is also becoming larger so that the consumer can enjoy the moving picture more comfortably.

As the size of the display increases, the size of the window panel attached to the display also increases. Such a window panel is usually made of tempered glass or the like. If the size of the window panel increases, it may be easily broken or broken when an impact is applied to the portable terminal. As a result, consumer dissatisfaction with the recent breakdown of window panels and the like is increasing rapidly.

In addition, with the complaints about the damage of the portable terminal, the complaints about the light leakage phenomenon of the portable terminal also constitute a large number of consumers' complaints. Specifically, the window panel can be adhered to the display unit of the portable terminal through the adhesive tape. In this case, the light output from the display may leak through the adhesive tape to cause a light leakage phenomenon. Such light leakage phenomenon must be solved in order to improve the quality of the portable terminal.

In addition, in recent years, there is an increasing need for consumers who want to use portable terminals comfortably in swimming pools or bathrooms. In order to implement a waterproof function in a portable terminal or the like, it is required to provide a structure capable of providing a sufficient watertightness against a minute clearance of a portable terminal such as a terminal module unit or a window panel joint.

An object of the present invention is to provide a buffer tape having a function of preventing a light leakage, which can alleviate an impact applied to an object while blocking light leaking from the object.

Another object of the present invention is to provide a buffer tape having a function of preventing light leakage and having a waterproof function, which can provide both a buffer function and a light leakage prevention function for an object as well as a waterproof function.

According to an aspect of the present invention, there is provided a buffer tape having a light-shielding and waterproof function, the buffer film comprising a foamed foamed polymer foam foam; A waterproof film having a waterproof polymer having a porosity of 1% to 50%; And a light blocking layer printed on the waterproof film and disposed between the waterproof film and the buffer film and having a colored material.

Here, the waterproof polymer may include thermoplastic polyurethane (TPU) or polyethylene terephthalate (PET).

Here, the waterproof film may include a corona-treated surface formed on at least one of its major surfaces.

Here, the colored material may include carbon black and an organic solvent.

Here, it is possible to further include an adhesive layer which is laminated on the waterproof film and has at least one adhesive or adhesive polymer resin of an acrylic type resin, a rubber type resin and an epoxy type resin.

According to an aspect of the present invention, there is provided a buffer tape having a light-shielding function, the buffer film comprising a foamed foamed polymer foam; And a light blocking film laminated on the buffer film and having a colored material.

Here, the polymer foamed foam may include at least one foamed article of polyethylene, polyurethane, and polypropylene.

Here, the light-shielding film may include a substrate; And a printing layer printed on the substrate and containing the colored material.

Here, the substrate may include a waterproof polymer having a porosity of 1% to 50%.

Here, the waterproof polymer may include thermoplastic polyurethane (TPU) or polyethylene terephthalate (PET).

Here, the substrate may include a corona treated surface formed on at least one of its major surfaces.

Here, the print layer may be disposed between the buffer film and the substrate.

Here, the colored material may include carbon black.

Here, the printing layer may include: a first printing layer printed on the base material; And a second printing layer printed on the first printing layer.

Here, an adhesive layer which is laminated on the light blocking film and has a sticky or adhesive polymer resin may be further provided.

According to another aspect of the present invention, there is provided a buffer tape having a light-shielding function, the buffer film comprising a foamed foamed polymer foam; And a light blocking film laminated on the buffer film and produced by extrusion or casting a mixture of a waterproof polymer and a colored pigment.

Here, the colored pigment may include carbon black and an organic solvent.

Here, the mixture may include aluminum oxide (Al ₂ O ₃ ).

Here, the adhesive layer may further include at least one adhesive or adhesive polymer resin, which is laminated on the light-shielding film and is an acrylic-based resin, a rubber-based resin, or an epoxy-based resin.

According to the buffer tape having the light-shielding function according to the present invention configured as described above, the impact applied to the object can be absorbed through the constitution of the foamed foamed foam. Thus, it is possible to prevent a considerable amount of breakdown of the object and a failure phenomenon caused by the impact.

In addition, when the buffer tape having the function of preventing light leakage is attached to the window panel of the portable terminal, light leaking from the display panel of the portable terminal can be easily blocked through the structure of the light blocking film adhered to the buffer film, The finishing quality of the terminal can be further improved.

Further, the fine clearance of the object can be firmly sealed through the constitution of the waterproof polymer, and the waterproof function can be provided to the object.

1 is a cross-sectional view of a buffer tape 100 having a light leakage preventing function according to an embodiment of the present invention.
2 is a cross-sectional view of a buffer tape 100 'having a light leakage preventing function according to another embodiment of the present invention.
3 is a cross-sectional view of a buffer tape 100 "having light leakage preventing function according to another embodiment of the present invention.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a buffer tape having a light leakage prevention function according to a preferred embodiment of the present invention will be described in detail with reference to the accompanying drawings. In the present specification, the same or similar reference numerals are given to different embodiments in the same or similar configurations.

1 is a cross-sectional view of a buffer tape 100 having a light leakage preventing function according to an embodiment of the present invention.

Referring to the drawings, a buffer tape 100 having a light leakage preventing function may include a buffer film 110, a light blocking film 120, and an adhesion layer 130.

The buffer film 110 is a structure for imparting an impact relaxation function to the buffer tape 100 having a light leakage preventing function. The cushioning film 110 may comprise a polymer foam. The polymer foamed foam may include a foamed article formed by foam molding of at least one of polyethylene, polyurethane, and polypropylene.

Such a polymer foam foam may be prepared according to a foam molding process and may include a plurality of pores therein. Specifically, the polymer foam foam may have a porosity of 80% to 98%. With this configuration, the polymer foam foam is elastically deformed, absorbing the impact applied to the attachment point of the buffer tape 100 having the light leakage preventing function, and can be restored again.

The buffer film 110 having such a structure may have a thickness of 70 mu m to 200 mu m. More specifically, if the buffer film 110 has a thickness of 70 μm or more, which is the minimum thickness required for foaming, and if the buffer film 110 is too thick, it may hinder the slimming of the finished product to which the buffer tape 100 is attached The buffer film 110 may have a thickness of 200 mu m or less.

The light blocking film 120 is a structure for providing a light leakage preventing function. The light blocking film 120 may include a substrate 121, and a printing layer 123.

The substrate 121 is a base on which the printing layer 123 is printed, and also functions to provide a waterproof function. In view of such a function, the base material 121 may be referred to as a " waterproof film 121 ". To this end, the substrate 121 may comprise a waterproof polymer in the form of a film.

Here, the waterproof polymer may include polyethylene terephthalate (PET) or thermoplastic polyurethane (TPU). Here, polyethylene terephthalate is a saturated polyester obtained by condensing terephthalic acid and ethylene glycol, and has not only high heat resistance and oil resistance, but also excellent waterproofness. Further, the thermoplastic polyurethane is excellent in chemical resistance and abrasion resistance due to friction, is excellent in elasticity and flexibility, and has a characteristic of easily returning to its original shape when the applied pressure is released.

Such a waterproof polymer may have a porosity of 1% to 50%. Specifically, the pores in the waterproof polymer may provide a certain level of buffering function, but water may permeate through these pores when an excessive amount of pores are formed in the waterproof polymer. Accordingly, in order to provide a waterproof function, the waterproof polymer preferably has a low porosity of 50% or less.

In addition, the substrate 121 configured as described above may have a thickness of 10 탆 to 50 탆. Specifically, when the thickness of the base material 121 is less than 10 mu m, the waterproofing ability may be lowered due to the pores described above. When the thickness of the base material 121 exceeds 50 mu m, the total thickness of the buffer tape 100 having a light- And the slimness of the finished product to which the buffering tape 100 is attached can be inhibited.

The substrate 121 may include a corona treated surface on at least one of its two major surfaces. Here, the corona treatment is a method for modifying the surface of a film, wherein a corona salt is generated by using a discharge processor, and the surface is modified by passing the film through the substrate 121. The corona-treated surface thus treated can be prevented from peeling due to an increase in adhesion force. Such a corona-treated surface is placed in contact with the adhesion layer 130, the print layer 123, or the cushioning film 110 Thereby enhancing the adhesive force between the two.

The print layer 123 is a structure for performing a light shielding function. In light of this functionality, the printing layer 123 may be referred to as a " light blocking layer 123 ". The printing layer 123 may be formed by micro gravure printing on the substrate 121 with colored materials in the form of ink. These colored materials may include carbon black and organic solvents.

Carbon black is a black fine powder composed of carbon, which is excellent in light diffusivity. Thus, the carbon black is printed on the relatively transparent substrate 121, so that the buffer tape 100 can be provided with a light-shielding function.

The organic solvent may be mixed with carbon black to form a carbon ink which is a colored material. Here, the carbon black may be mixed in an amount of 100 parts by weight or more based on 100 parts by weight of the organic solvent. Specifically, as the content of the carbon black in the total weight of the carbon ink increases, the light shielding force also increases, and when the content of the carbon black is 50% or more, the light shielding power is extremely excellent.

The carbon ink thus formed can be printed a plurality of times on the substrate 121 made of a waterproof polymer to form the print layer 123. Here, since the carbon ink is printed by the micro gravure printing method accompanied by the drying process by the hot air, the plurality of the printing layers 123 can be formed quickly on the base material 121. Specifically, the light shielding film 120 is formed by microgravally printing carbon ink on the substrate 121 as described above to form the first print layer 125, and then the carbon ink is coated on the first print layer 125, The second printed layer 127 may be formed by microgravure printing again. Here, when printing is performed only once on the base material 121, light leakage phenomenon is not easily prevented, and the printing layer 123 may peel off. Accordingly, the print layer 123 is formed in such a manner that the print layer 123 is printed on the substrate 121 a plurality of times, thereby effectively preventing the light leakage phenomenon and the peeling phenomenon. Here, the print layer 123 may further include a third print layer or more in addition to the first print layer 125 and the second print layer 127. [

When the printing layer 123 is formed on the base material 121 as described above, the printing layer 123 can be adhered to the buffer film 110 with an adhesive, an adhesive, or the like. According to such a configuration, since the relatively easily peelable print layer 123 is disposed between the cushioning film 110 and the base material 121 without directly contacting the adhesion layer 130, peeling off of the print layer 123 The possibility can be lowered.

The print layer 123 configured as described above may have a thickness of 1 占 퐉 to 10 占 퐉. If the thickness of the print layer 123 is less than 1 mu m, the light blocking efficiency is lowered. If the thickness of the print layer 123 exceeds 10 mu m, the possibility that the print layer 123 is peeled off from the buffer film 110 is relatively . Accordingly, since the print layer 123 is constructed to have the above-described thickness, excellent light shielding force and adhesion force can be obtained at the same time.

The adhesive layer 130 is a structure for providing the adhesive force of the buffer tape 100 to the object to be adhered. The adhesion layer 130 may be composed of a sticky or adhesive polymer resin. Specifically, the polymer resin may include at least one of an acrylic-based resin, a rubber-based resin, and an epoxy-based resin.

On the other hand, the adhesion layer 130 may have a thickness of 10 mu m to 100 mu m. If the thickness of the adhesive layer 130 is less than 10 탆, the adhesive force of the adhesive layer 130 relatively decreases. If the thickness of the adhesive layer 130 exceeds 100 탆, peeling of the light blocking film 120 may occur. Accordingly, the thickness of the adhesive layer 130 can be appropriately adjusted within the above-mentioned range in consideration of the above-described problems and slimming of the object to be adhered.

According to the buffer tape 100 having the light-shielding function as described above, an excellent buffering force can be imparted to an object to be adhered, and an effect of preventing light leakage can be obtained by attaching to a front panel or the like of a portable terminal . At the same time, the waterproof polymer of the light shielding film 120 can also provide a considerable level of water resistance against the object to be adhered. In view of the waterproof function, the buffer tape 100 having a light leakage prevention function may be referred to as a buffer tape 100 having a function of preventing light leakage and having a waterproof function.

2 is a cross-sectional view of a buffer tape 100 'having a light leakage preventing function according to another embodiment of the present invention.

Referring to this figure, a buffer tape 100 'having a light leakage preventing function may include a light blocking film 120' which is different from the above-described embodiment.

In addition to the thermoplastic polyurethane or polyethylene terephthalate, the light-shielding film 120 'may further include a colored pigment, and an inorganic material.

The colored pigments may include carbon black and organic solvents, such as the above-mentioned colored materials. Here, as described above, the carbon black may be mixed in an amount of 100 parts by weight or more based on 100 parts by weight of the organic solvent. Here, as described above, as the content of carbon black increases, the light shielding force also increases. Specifically, the carbon black has a very excellent light shielding ability when its content is higher than that of the organic solvent.

The inorganic material is a structure for maintaining the shape of the buffer film 110 and the light blocking film 120 '. The thermoplastic polyurethane is excellent in flexibility or elasticity due to the nature of the material, and it is not easy to maintain the shape of the polyurethane. Accordingly, the light blocking film 120 'may be formed by adding an inorganic substance harder in hardness such as aluminum oxide (Al ₂ O ₃ ) to maintain the shape of the light blocking film 120'.

This light blocking film 120 'can be obtained by manufacturing a mixture of the above-described structures through an extrusion or casting molding method. The casting molding is a type of film forming method in which the light blocking film 120 'is obtained by flowing a mixture of a waterproof polymer in a molten state, a colored pigment, and an inorganic substance onto a substrate having a predetermined surface, .

The light blocking film 120 'produced by this method may have a porosity of 1% to 50% as described above. Due to the relatively low porosity, the light blocking film 120 'can provide a waterproof function to the buffer tape 100'.

In addition, the corona-treated surface described above may be formed on at least one of the major surfaces of the light blocking film 120 '. Such a corona treated surface can be disposed in contact with the adhesive layer 130 or the cushioning film 110 to enhance adhesion with them.

According to the cushioning tape 100 'configured as described above, the light blocking film 120' itself has a waterproofing ability, so that the printing layer 123 can be removed unlike the above embodiment. As a result, the step of printing carbon ink on the substrate 121 can be omitted, and the manufacturing process can be reduced considerably.

3 is a cross-sectional view of a buffer tape 100 "having light leakage preventing function according to another embodiment of the present invention.

Referring to this figure, a buffer tape 100 "having a light leakage prevention function may have only one light blocking film 120", unlike the embodiment described with reference to FIG. According to this structure, when a light shielding force and a waterproofing force are required to a somewhat low level at the attachment point, the light shielding film 120 "is formed only on one surface of the buffer film 110, The buffer tape 100 "having a light-shielding function may be configured to have only one adhesive layer 130 depending on the characteristics of the object to be adhered.

The buffer tape having the above-described light leakage preventing function is not limited to the configuration and the operation manner of the embodiments described above. The above embodiments may be configured so that all or some of the embodiments may be selectively combined to make various modifications.

100: buffer tape with light-shielding function
110: buffer film
120: light blocking film
130: Adhesion layer

Claims (19)

A buffer film having a foamed foamed polymer foam;
A waterproof film having a waterproof polymer having a porosity of 1% to 50%; And
And a light blocking layer printed on the waterproof film and disposed between the waterproof film and the cushioning film and having a colored material.
The method according to claim 1,
The water-
A cushioning tape having light-leak prevention and waterproof function, comprising thermoplastic polyurethane (TPU) or polyethylene terephthalate (PET).
The method according to claim 1,
In the waterproof film,
And a corona-treated surface formed on at least one of its both major surfaces.
The method according to claim 1,
The colored material,
A cushioning tape having light-shielding and waterproofing properties, comprising carbon black and an organic solvent.
The method according to claim 1,
Further comprising an adhesive layer laminated on the waterproof film and having at least one adhesive or adhesive polymer resin selected from the group consisting of an acryl-based resin, a rubber-based resin, and an epoxy-based resin.
A buffer film having a foamed foamed polymer foam; And
And a light blocking film laminated on the buffer film and having a colored material.
The method according to claim 6,
The polymer foam,
1. A cushioning tape having a light-shielding function, comprising at least one foamed article of polyethylene, polyurethane, and polypropylene.
The method according to claim 6,
The light-
materials; And
And a printed layer printed on the base material and containing the colored material.
9. The method of claim 8,
The above-
And a waterproof polymer having a porosity of 1% to 50%.
10. The method of claim 9,
The water-
A cushioning tape having a light-shielding function, comprising thermoplastic polyurethane (TPU) or polyethylene terephthalate (PET).
9. The method of claim 8,
The above-
And a corona treated surface formed on at least one of its both major surfaces.
9. The method of claim 8,
Wherein the print layer comprises:
And a cushioning tape disposed between the buffer film and the substrate, the buffer tape having a light-shielding function.
The method according to claim 6,
The colored material,
A cushioning tape having a light-shielding function, including carbon black.
9. The method of claim 8,
Wherein the print layer comprises:
A first printing layer printed on the substrate; And
And a second printed layer printed on the first printed layer.
The method according to claim 6,
Further comprising an adhesive layer laminated on the light blocking film and having a tacky or adhesive polymer resin.
A buffer film having a foamed foamed polymer foam; And
And a light blocking film formed by extrusion or casting a mixture of a waterproof polymer and a colored pigment laminated on the buffer film.
17. The method of claim 16,
The colored pigment may contain,
A cushioning tape having light-shielding properties, comprising carbon black and an organic solvent.
17. The method of claim 16,
The mixture may contain,
A cushioning tape having a light-shielding function, comprising aluminum oxide (Al ₂ O ₃ ).
17. The method of claim 16,
Further comprising an adhesive layer laminated on the light shielding film and having at least one adhesive or adhesive polymer resin selected from the group consisting of an acrylic series resin, a rubber series resin and an epoxy series resin.

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