KR20140147550A - Multilayer reflective foam - Google Patents
Multilayer reflective foam Download PDFInfo
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- KR20140147550A KR20140147550A KR1020130071038A KR20130071038A KR20140147550A KR 20140147550 A KR20140147550 A KR 20140147550A KR 1020130071038 A KR1020130071038 A KR 1020130071038A KR 20130071038 A KR20130071038 A KR 20130071038A KR 20140147550 A KR20140147550 A KR 20140147550A
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- plastic layer
- plastic
- foamed
- layer
- resin
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B27/00—Layered products comprising a layer of synthetic resin
- B32B27/06—Layered products comprising a layer of synthetic resin as the main or only constituent of a layer, which is next to another layer of the same or of a different material
- B32B27/08—Layered products comprising a layer of synthetic resin as the main or only constituent of a layer, which is next to another layer of the same or of a different material of synthetic resin
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B1/00—Optical elements characterised by the material of which they are made; Optical coatings for optical elements
- G02B1/04—Optical elements characterised by the material of which they are made; Optical coatings for optical elements made of organic materials, e.g. plastics
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B5/00—Optical elements other than lenses
- G02B5/08—Mirrors
- G02B5/0816—Multilayer mirrors, i.e. having two or more reflecting layers
- G02B5/0825—Multilayer mirrors, i.e. having two or more reflecting layers the reflecting layers comprising dielectric materials only
- G02B5/0841—Multilayer mirrors, i.e. having two or more reflecting layers the reflecting layers comprising dielectric materials only comprising organic materials, e.g. polymers
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/0001—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems
- G02B6/0011—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems the light guides being planar or of plate-like form
- G02B6/0033—Means for improving the coupling-out of light from the light guide
- G02B6/005—Means for improving the coupling-out of light from the light guide provided by one optical element, or plurality thereof, placed on the light output side of the light guide
- G02B6/0051—Diffusing sheet or layer
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- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on liquid crystals, e.g. single liquid crystal display cells
- G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
- G02F1/1333—Constructional arrangements; Manufacturing methods
- G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
- G02F1/1336—Illuminating devices
- G02F1/133602—Direct backlight
- G02F1/133605—Direct backlight including specially adapted reflectors
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Nonlinear Science (AREA)
- Mathematical Physics (AREA)
- Chemical & Material Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Optical Elements Other Than Lenses (AREA)
- Laminated Bodies (AREA)
Abstract
The present invention relates to a resin composition comprising (i) a first plastic layer containing a plastic resin and containing bubbles having an average diameter of 0.1 to 10 mu m, and (ii) And a second plastic layer including a filler. The foamed reflector of the present invention is excellent in light resistance and heat resistance and is excellent in uniformity in thickness, so that the reflection reflectance of excellent visible light is high And thus can be effectively used as a light reflector of a backlight unit (BLU) of a liquid crystal display device.
Description
BACKGROUND OF THE INVENTION Field of the Invention [0001] The present invention relates to a foamed reflector used as a light reflector of a liquid crystal display or the like.
Since a liquid crystal display (LCD) widely used as a flat panel display is a light-receiving device that displays an image by adjusting the amount of light coming from the outside, a backlight source form capable of maintaining uniform brightness throughout the screen A back light unit (BLU) of the backlight unit is required.
A backlight unit is a device that can display information by supplying lamp light to an LCD that can not emit light by itself, and is called a backlight unit on the back of the LCD.
As a light source of a backlight, a compact fluorescent lamp or a light emitting diode (LED) is mainly used. Since the compact fluorescent lamp or LED is a linear light source or a point light source, the BLU uses a light guide plate, , A prism sheet, or the like, is used as a surface light source.
The light guide plate is a component that converts the light incident from the light source into a uniform plane light, and the reflection plate is positioned below the light guide plate, and functions to efficiently guide light from the light source to the light guide plate.
The reflector is stacked on the back surface of the light guide plate in order to reflect the light leaking back to the light guide plate to the front surface. The reflector must be thin, and the specular reflectance must be high and the diffuse reflectance, which is the degree of reflection of the light in all directions, must be high.
Japanese Patent Application Laid-Open No. 2-269382 discloses a reflective plate made of a white polyester film to which white pigment such as titanium oxide is added. The use of such a reflector improves the accuracy of the reflection to some extent and reflects white light by a white pigment such as titanium oxide added to reflect visible light but the white pigment absorbs light of a specific wavelength When the content of the pigment is increased, the temperature of the reflection plate is increased, and when the temperature of the reflection plate is increased, there is a problem that the uniformity of the thickness of the reflection plate is lowered and the reflectance of the reflection light of a specific wavelength is gradually decreased.
Therefore, there is a demand for a reflector capable of maintaining excellent diffuse reflectance of visible light, while having high light resistance and heat resistance and excellent thickness uniformity, and high reflection precision.
An object of the present invention is to provide a foamed reflector capable of exhibiting excellent diffuse reflectance of visible light while having high light resistance and heat resistance and excellent thickness uniformity and high reflection precision.
(I) a first plastic layer containing a plastic resin and containing bubbles having an average diameter of 0.1 to 10 mu m, and
(ii) a second plastic layer disposed on one surface and the other surface of the first plastic layer,
Layered foamed reflector comprising:
The foamed reflector according to the present invention can exhibit excellent diffuse reflectance of visible light while exhibiting excellent light resistance and heat resistance and excellent thickness uniformity and high reflection accuracy. Therefore, the foamed reflector of the backlight unit It can be usefully used as a light reflector.
BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1 is a view schematically showing a cross section of a foamed reflector according to an example of the present invention. Fig.
2 is a schematic view showing a cross section of a foamed reflector according to another embodiment of the present invention.
3 is a photograph of a cross section of a second plastic layer included in a foamed reflector according to an example of the present invention.
Hereinafter, the present invention will be described in more detail.
The multilayered foamed reflector according to the present invention comprises: (i) a first plastic layer containing a plastic resin and containing bubbles having an average diameter of 0.1 to 10 μm; and (ii) And a second plastic layer comprising a plastic resin and a filler.
The first plastic layer comprises a plastic resin and may contain air bubbles having an average diameter of 0.1 to 10 mu m by foaming the plastic resin.
The bubbles may be contained in the plastic resin by foaming using an inert gas, preferably CO 2 gas. By containing the bubbles, the first plastic layer can reflect light.
When light is incident on the first plastic layer, the plastic resin contained in the first plastic layer and the bubbles contained therein are passed through the reflection, transmission and absorption by changing the medium while passing through the bubbles. At this time, So that the first plastic layer containing it has a reflective performance as the sum of the specular reflectances.
Therefore, if the incident light does not undergo a sufficient change in the medium, the bubble may have an average diameter of 0.1 to 10 [mu] m for sufficient medium change, Preferably 0.1 to 8 mu m, more preferably 0.1 to 5 mu m.
The first plastic layer may further comprise a nucleating agent. The additional nucleating agent is not particularly limited as long as it is a nucleating agent generally used as a film composite material and specific examples thereof include titanium dioxide, potassium titanate, alumina, aluminosilicate, silicon dioxide, calcium oxide, calcium carbonate, barium sulfate, talc, Kaolinite, zeolite and mixtures thereof, preferably titanium dioxide, potassium titanate, alumina or barium sulfate.
The nucleating agent is generally a film composite material to increase the strength of the film to improve the abrasion resistance or to form the unevenness on the surface of the film to impart handling properties such as activity (slipperiness), running property, winding property .
The content of the nucleating agent may be 10 parts by weight or less, 0.1 to 10 parts by weight, 0.1 to 5 parts by weight, and 0.1 to 3 parts by weight based on 100 parts by weight of the plastic resin. When the content of the nucleating agent is more than 10 parts by weight, foreign matter tends to be generated when the first plastic layer is formed into a film form. In particular, when the first plastic layer containing foam is foamed, light loss is increased There is a problem that the reflectance is lowered, which is not preferable.
The first plastic layer may be a film form of foam plastic or a flat sheet-like layer.
The first plastic layer may have a specific gravity of 0.3 to 0.9, preferably 0.3 to 0.6, and a foaming ratio of 150 to 400%, preferably 200 to 300%.
If the specific gravity is less than 0.3 or the foaming ratio is more than 400%, the amount of bubbles contained is excessive, so that the incident light does not undergo a sufficient change in the medium and the strength of the reflection plate is lowered. If the foaming ratio is less than 150%, the bubbles contained are too small and the incident light does not undergo a sufficient change in the medium, so that the foamed reflector does not exhibit the desired reflection performance, which is not preferable.
The second plastic layer is disposed on one surface and the other surface of the first plastic layer, respectively, and includes a plastic resin and a filler.
The second plastic layer includes a plastic resin and a filler, and may preferably exhibit a white color.
Specific examples of the filler include titanium dioxide, potassium titanate, alumina, aluminosilicate, silicon dioxide, calcium oxide, calcium carbonate, barium sulfate, talc, mica, kaolinite, zeolite and mixtures thereof, Lt; / RTI >
When the second plastic layer is stretched, voids may be generated around the filler particles, so that the second plastic layer may contain a plurality of microvoids. The pores may have an average diameter of 1 to 1,200 nm and may have an average diameter of 2 to 1,200 nm, 5 to 1,200 nm, 10 to 1,200 nm, 50 to 1,200 nm, 100 to 1,200 nm, 1 to 1,000 nm, From 1 to 900 nm, from 5 to 900 nm, from 10 to 900 nm, from 50 to 900 nm, from 100 to 900 nm, have.
The second plastic layer may contain 0.1 to 10 parts by weight, 0.1 to 5 parts by weight, 0.1 to 4 parts by weight, and 0.1 to 3 parts by weight of the filler based on 100 parts by weight of the plastic resin.
If the content of the filler is less than 0.1 parts by weight, the amount of light reflected by the filler in the second plastic layer and the amount of void generated around the filler in the case where the second plastic layer is stretched is reduced and reflected by the void If the content of the filler exceeds 10 parts by weight, the amount of light absorbed by the filler is increased and the reflectance of the second plastic layer is lowered. As a result, The generation of the voids is not performed well and the uniformity of the thickness of the second plastic layer is deteriorated when the second plastic layer receives heat.
The filler may have a particle size of 1 to 1,000 nm and may have a particle size of 1 to 900 nm, 1 to 800 nm, 1 to 700 nm, 1 to 600 nm, 1 to 500 nm, 1 to 400 nm, 1 to 350 nm, 10 nm to 300 nm, 1 to 250 nm, 1 to 200 nm, 1 to 150 nm, 10 to 1,000 nm, 10 to 900 nm, 10 to 800 nm, 10 to 700 nm, 10 to 600 nm, 400 nm, 10 to 350 nm, 10 to 300 nm, 10 to 250 nm, 10 to 200 nm and 10 to 150 nm.
The foamed reflector of the present invention may further include a non-foamed plastic layer including a plastic resin between the first plastic layer and the second plastic layer.
The non-foamed plastic layer may have a thickness of 5 to 10 占 퐉 and may form an interface between the first plastic layer and the second plastic layer.
The non-foamed plastic layer may be formed by laminating the first plastic layer on one side and the other side of the first plastic layer and then laminating the second plastic layer. Preferably, the non- There is a portion of the surface of the first plastic layer in contact with the second plastic layer that is not foamed to form the non-foamed plastic layer, .
The plastic resin included in the first plastic layer, the second plastic layer, and the non-foamed plastic layer may be a polyester resin, a polyolefin resin, or a mixture thereof. Examples of the polyester resin include polyethylene terephthalate ( (PET), polybutylene terephthalate (PBT), polyethylene naphthalate (PEN) and mixtures thereof. Examples of the polyolefin-based resin include polyethylene, polypropylene, polyisobutylene and mixtures thereof.
The plastic resin may preferably be polyethylene terephthalate, or may be made by blending poly (ethylene terephthalate) (PET) with polybutylene terephthalate.
The first plastic layer may have a thickness of 100 to 650 μm, preferably 200 to 400 μm, and the total thickness of the foamed reflector may be 110 to 700 μm, preferably 200 to 400 μm.
If the thickness of the first plastic layer is less than 100 탆, it is not preferable that the foamed reflector has a predetermined shape because the shape of the foamed reflector is inferior and deformation may occur. If the thickness is 650 탆 or more, When the foamed reflector is applied to the BLU of the LCD, it becomes more difficult to implement the BLU in an ultra-thin form.
The second plastic layer has a thickness of 5 to 50 탆, 5 to 30 탆, 5 to 25 탆, 5 to 20 탆, 5 to 15 탆, 5 to 10 탆, 10 to 30 탆, 10 to 25 탆, 10 10 to 15 占 퐉, 15 to 25 占 퐉, and 15 to 20 占 퐉.
The non-foamed plastic layer may have a thickness of 5 to 10 탆, 5 to 9 탆, and 5 to 8 탆.
Each of the first plastic layer, the second plastic layer and the non-foam plastic layer constituting the foamed reflector of the present invention may be a stretched film, and may be a lead-free film if necessary.
Since the foamed reflector of the present invention has a reflectance of 98% or more, it can be usefully used as a reflector in the production of a liquid crystal display device, particularly a backlight unit.
Hereinafter, the foamed reflector of the present invention will be described in more detail with reference to the drawings, but the drawings are only for illustrating the present invention, and the scope of the present invention is not limited thereto.
Fig. 1 and Fig. 2 each schematically show a cross section of a foamed reflector according to an example of the present invention.
1, a foamed reflector according to an exemplary embodiment of the present invention includes a
2, a foamed reflector according to another embodiment of the present invention includes a
As described above, the foamed reflector of the present invention includes a first plastic layer and a second plastic layer, and further includes a non-foamed plastic layer between the first plastic layer and the second plastic layer.
3 is a photograph of a cross section of a second plastic layer of a foamed reflector according to an example of the present invention.
Referring to FIG. 3, the second plastic layer included in the foamed reflector according to an exemplary embodiment of the present invention includes voids, and the voids are formed around the filler.
Hereinafter, the present invention will be described in more detail with reference to preferred embodiments for better understanding of the present invention. However, the following examples are intended to illustrate the present invention, but the scope of the present invention is not limited to or by the following examples.
Example 1
PET resin chips were put into a first extruder (260 ° C) (A layer), and 5 parts by weight of titanium oxide having a particle diameter of 100 to 1,000 nm were kneaded with respect to 100 parts by weight of PET resin chips, which were then fed into a second extruder (Layer B).
A melt extruded from each extruder is coextruded in a B / A / B form in a feed block and then extruded through a casting roll in three temperature ranges of 180 to 200 DEG C, 140 to 150 DEG C and 90 to 100 DEG C To produce a non-oriented plastic film having a thickness of 400 탆 for the A layer and a thickness of 20 탆 for the B layer to a thickness of 440 탆. The non-extensible plastic film was filled with CO 2 gas at a pressure of 100 bar, followed by stretching at a temperature of 200 to 230 ° C and a pressure of 50 to 100 kgf to produce a foamed reflector. The thickness of the manufactured foamed reflector was 330 탆, and using the SEM, the A layer contained bubbles having an average cell diameter of 3 탆, and the B layer contained voids having a diameter of 1 to 1,000 nm. At this time, it was confirmed that the outer layer portion of the layer A, which is in contact with the layer B, has a thickness of about 5 占 퐉 that does not contain air bubbles.
Comparative Example 1
The PET resin chips were put into an extruder at 260 占 폚 and the melt extruded from the extruder was cooled in a temperature range of 180 to 200 占 폚, 140 to 150 占 폚 and 90 to 100 占 폚 using a casting roll, A layered plastic was prepared to a thickness of 300 탆.
The plastic of the unleaded single-layer structure was filled with CO 2 gas at a pressure of 100 bar and then subjected to a heat of 200 to 230 ° C and a pressure of 50 to 100 kgf to contain air bubbles having an average cell diameter of 10 탆, Reflective plate.
Comparative Example 2
10 parts by weight of titanium oxide was kneaded with respect to 100 parts by weight of PET resin chips, and the kneaded material was extruded in an extruder at 260 캜. The extruded melt was extruded at 180 to 200 캜, 140 to 150 캜, 90 to 100 Lt; RTI ID = 0.0 > 300 C < / RTI >
Layer thickness (탆)
(Parts by weight)
Diameter (탆)
Diameter (nm)
Experimental Example 1: Measurement of reflectance
The reflectance of the foamed reflector prepared in Example 1 and Comparative Examples 1 and 2 was measured in a wavelength range of 400 to 1,200 nm using a magnetic spectrophotometer (CM-2600d, Minolta Co.). The relative reflectance of each foaming reflector was determined on the basis of the diffuse reflectance of the white board hardened with barium sulfate to 100%, which is shown in Table 2 below.
(Reflectance,%)
10: first plastic layer
20: second plastic layer
30: Non-foam plastic layer
Claims (12)
(ii) a second plastic layer disposed on one surface and the other surface of the first plastic layer,
Layer foil.
Wherein the second plastic layer contains pores having an average diameter of 1 to 1200 nm.
Wherein the second plastic layer comprises the filler in an amount of 0.1 to 10 parts by weight based on 100 parts by weight of the plastic resin contained in the second plastic layer.
Wherein the filler is TiO 2 in a multi-layer foamed reflection plate.
Wherein the filler has a particle diameter of 1 to 1,000 nm.
And a non-foamed plastic layer containing a plastic resin between the first plastic layer and the second plastic layer.
Wherein the first plastic layer has a specific gravity of 0.3 to 0.9 and a foaming ratio of 150 to 400%.
Wherein the plastic resin is a polyester resin, a polyolefin resin or a mixture thereof.
Wherein the plastic resin is a polyethylene terephthalate (PET), a polybutylene terephthalate (PBT), a polyethylene naphthalate (PEN), a polyethylene, a polypropylene, a polyisobutylene or a mixture thereof.
Wherein the first plastic layer has a thickness of 100 to 650 占 퐉 and the total thickness of the foamed reflector is 110 to 700 占 퐉.
And the second plastic layer has a thickness of 5 to 50 占 퐉.
Wherein the non-foamed plastic layer has a thickness of 5 to 10 占 퐉.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| KR1020130071038A KR20140147550A (en) | 2013-06-20 | 2013-06-20 | Multilayer reflective foam |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| KR1020130071038A KR20140147550A (en) | 2013-06-20 | 2013-06-20 | Multilayer reflective foam |
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| KR20140147550A true KR20140147550A (en) | 2014-12-30 |
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| KR1020130071038A KR20140147550A (en) | 2013-06-20 | 2013-06-20 | Multilayer reflective foam |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106908886A (en) * | 2017-04-18 | 2017-06-30 | 宁波长阳科技股份有限公司 | A kind of property endured coating reflectance coating high and preparation method thereof |
| CN107850703A (en) * | 2015-07-24 | 2018-03-27 | 3M创新有限公司 | Reflection with heat dissipating layer stacks |
| CN110938405A (en) * | 2019-12-16 | 2020-03-31 | 广州市高士实业有限公司 | Organic silica gel with heat resistance and acid and alkali resistance |
-
2013
- 2013-06-20 KR KR1020130071038A patent/KR20140147550A/en not_active Application Discontinuation
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107850703A (en) * | 2015-07-24 | 2018-03-27 | 3M创新有限公司 | Reflection with heat dissipating layer stacks |
| CN107850703B (en) * | 2015-07-24 | 2021-07-27 | 3M创新有限公司 | Reflective stack with heat sink layer |
| US11726238B2 (en) | 2015-07-24 | 2023-08-15 | 3M Innovative Properties Company | Reflective stack with heat spreading layer |
| CN106908886A (en) * | 2017-04-18 | 2017-06-30 | 宁波长阳科技股份有限公司 | A kind of property endured coating reflectance coating high and preparation method thereof |
| CN110938405A (en) * | 2019-12-16 | 2020-03-31 | 广州市高士实业有限公司 | Organic silica gel with heat resistance and acid and alkali resistance |
| CN110938405B (en) * | 2019-12-16 | 2021-11-23 | 广州市高士实业有限公司 | Organic silica gel with heat resistance and acid and alkali resistance |
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