CN211591565U

CN211591565U - Optics level OCA is with from type membrane

Info

Publication number: CN211591565U
Application number: CN201922371554.3U
Authority: CN
Inventors: 顾长均; 邓浩鹏
Original assignee: Dongguan Dingli Film Technology Co ltd
Current assignee: Dongguan Dingli Film Technology Co ltd
Priority date: 2019-12-24
Filing date: 2019-12-24
Publication date: 2020-09-29
Anticipated expiration: 2029-12-24

Abstract

The utility model provides an optics level OCA is with leaving type membrane, including the high substrate layer that passes through, be equipped with the tie coat in the at least one side of the high substrate layer that passes through, be equipped with from the type layer in the another side of tie coat, be equipped with the protective layer in the another side from the type layer, the luminousness that the high substrate layer that passes through is 91-97% and haze is 1-2.5%, and the tie coat is transparent construction. The release film for the optical-grade OCA achieves the effects of high transparency and low haze by utilizing the light transmittance of the high-transparency base material layer of 91-97% and the haze of 1-2.5%. The tie coat is transparent construction, and the luminousness reaches more than 91%, avoids causing the influence to optical grade OCA with from type membrane. The release layer has good stripping performance, so that the release film has stable release force. The protective layer has the performances of scratch resistance and metal scratch resistance, and the phenomenon that the transmittance of the release film is damaged due to scratch and friction in the production and transportation processes is avoided, so that the overall transmittance of the OCA adhesive is influenced.

Description

Optics level OCA is with from type membrane

Technical Field

The utility model relates to a from type membrane technical field, more specifically relate to an optics level OCA is with from type membrane.

Background

The OCA (optical Clear Adhesive) is a clean high-transparency substrate-free double-sided Adhesive tape, has excellent transparency, light transmittance of over 90 percent, high clarity and high light transmittance, has total light transmittance of more than 90 percent, and also has the advantages of high adhesion, high temperature resistance, ultraviolet resistance and the like. The optical grade OCA film structure consists of: the release film layer, the OCA glue layer and the release film layer are compounded. The release films are respectively attached to the upper surface and the lower surface of the OCA optical adhesive layer. The adhesive can be used under the environment of strong light irradiation and high temperature and high humidity without damaging the appearance, is suitable for adhering plastic materials such as polycarbonate and the like, is mainly used for adhering a substrate (a capacitive screen and a resistive screen) of a touch screen and a front panel at present, is widely used in smart phones, handwriting computers and touch screen multimedia machines, and has a wide market.

The release film refers to a film having a surface with separability, and the release film has no or slight stickiness with a specific material after being contacted with the specific material under a limited condition. The release film is also called as a release film, a barrier film, a separation film, a glue-blocking film, a release film, a plastic film, a hole-masking film, a silicon oil paper, an anti-sticking film, a molded paper, a slip film, a Tianna paper or a release paper, etc. The preparation of the release film is to coat release liquid on PET, PVC or PE and finally form a release layer through heat curing. In order to enhance the adhesive force between the release layer and the PET substrate and prevent the release layer from falling off, a common enterprise can form a corona layer on the surface of the PET substrate through plasma treatment or electric spark treatment, and the principle is that the surface of the PET substrate is struck by electric sparks to roughen the surface of the PET substrate and enhance the adhesive force; however, the surface roughness lowers the light transmittance of the release film and the haze becomes high. Meanwhile, in the coating process of the OCA, the OCA glue is coated on the release film, and an OCA glue layer is formed through UV or thermosetting, but if the light transmittance of the release film is very low, the haze is very high, after the OCA is cured, the whole light transmittance of the electronic optical adhesive (OCA) can be reduced, the OCA can not be favorably used for laminating the touch screen substrate or the TFT substrate in a composite mode, the light transmittance of a high-transmittance display screen or the touch screen is influenced, and the display screen can be relatively fuzzy and unclear.

Therefore, it is necessary to provide a release film for optical grade OCA having high light transmittance and high definition to solve the above problems.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide a optics level OCA that luminousness is high, definition is high is with leaving type membrane.

In order to realize the above object, the utility model provides an optics level OCA is with leaving type membrane, including the high substrate layer that passes through, in at least one side of the high substrate layer that passes through is equipped with the tie coat, in the another side of tie coat is equipped with from the type layer, in the another side from the type layer is equipped with the protective layer, the luminousness that the high substrate layer that passes through is 91-97% and haze is 1-2.5%, the tie coat is transparent construction.

Compared with the prior art, the release film for the optical grade OCA is provided with the bonding layer, the release layer and the protective layer on at least one surface of the high-transparency base material layer in sequence, and achieves the effects of high transparency and low haze by utilizing the light transmittance of the high-transparency base material layer of 91-97% and the haze of 1-2.5%. The tie coat is transparent construction, and the luminousness reaches more than 91%, avoids causing the influence to optical grade OCA with from type membrane. The release layer has good stripping performance, so that the release film has stable release force. The protective layer has the performances of scratch resistance and metal scratch resistance, and the phenomenon that the transmittance of the release film is damaged due to scratch and friction in the production and transportation processes is avoided, so that the overall transmittance of the OCA adhesive is influenced.

Preferably, the thickness of the high-transparency base material layer is 5-100 um.

Preferably, the thickness of the bonding layer is greater than that of the release layer.

Preferably, the thickness of the bonding layer is 4-20 um.

Preferably, the thickness of the release layer is 2-5 um.

Preferably, the coating weight of the release layer is 1-1.5 g/square meter.

Preferably, the thickness of the protective layer is 2-50 um.

Preferably, the protective layer is selected from a PP protective film, a BOPP scratch resistant film or a modified polyethylene wax layer.

Preferably, the peel strength of the modified polyethylene wax layer is 40-70 g/cm.

Preferably, the adhesive layer is an EVA adhesive film.

Drawings

Fig. 1 is a schematic structural diagram of an embodiment of a release film for optical grade OCA according to the present application.

Fig. 2 is a schematic structural diagram of another embodiment of the release film for optical grade OCA of the present application.

Description of the element reference numerals

Release film 100 for optical grade OCA, high-transparency base material layer 10, bonding layer 30, release layer 50 and protective layer 70.

Detailed Description

Embodiments of the present invention will now be described with reference to the drawings, wherein like element numerals represent like elements throughout.

Referring to fig. 1, the release film 100 for an optical grade OCA of the present application includes a high-transmittance substrate layer 10, a bonding layer 30 is disposed on at least one side of the high-transmittance substrate layer 10, a release layer 50 is disposed on the other side of the bonding layer 30, a protective layer 70 is disposed on the other side of the release layer 50, a light transmittance of the high-transmittance substrate layer 10 is 91-97%, a haze of the high-transmittance substrate layer is 1-2.5%, and the bonding layer 30 is in a transparent structure. It is to be noted that: the release layer 50 is provided on the other surface of the adhesive layer 30, that is, one surface of the adhesive layer 30 is connected to the high-transmittance base material layer 10, and the other surface is connected to the release layer 50. The structure described above may be provided on the front surface or the back surface of the high-transmittance substrate layer 10, or may be provided on both the front surface and the back surface of the high-transmittance substrate layer 10. Referring to fig. 1, in an embodiment, a bonding layer 30, a release layer 50 and a protection layer 70 are sequentially disposed on a front surface of the high-transmittance substrate layer 10. Referring to fig. 2, in another embodiment, the front surface of the high-transmittance substrate layer 10 is sequentially provided with an adhesive layer 30, a release layer 50 and a protection layer 70, and the back surface of the high-transmittance substrate layer 10 is also sequentially provided with the adhesive layer 30, the release layer 50 and the protection layer 70.

The high-transmittance substrate layer 10 is selected from any one of BOPET, PET, PCL, and TAC (cellulose triacetate). The light transmittance is 91-97%, and the haze is 1-2.5%. The thickness of the high-transmittance base material layer 10 is 25-200 um. Such as 25um, 50um, 75um, 100um, 125um, 150um, 175um, 200um in thickness of the high-transmittance substrate layer 10. In this embodiment, the high-transmittance substrate layer 10 is selected from TAC (cellulose triacetate), and has a light transmittance of 93.5%, a haze of 2%, and a thickness of 50um, but not limited thereto.

The adhesive layer 30 is an EVA film (polyethylene-polyvinyl acetate copolymer for short), which is a thermosetting adhesive film. The EVA adhesive film has the characteristics of excellent adhesive force, durability and transparency, can be suitable for adhesion of various interfaces, enhances the adhesive force between layers, and effectively prevents silicone oil of the release layer 50 from falling off, and comprises glass, metal and plastic, such as BOPET, PET and the like. Its good durability can also resist high temperature, moisture, ultraviolet rays, etc. In particular, the adhesive force of EVA is not affected by humidity and water-absorbing films. The EVA glued membrane of transparent construction has high luminousness, and the luminousness reaches more than 91%, replaces traditional passing through the corona machine on the high substrate layer 10 that passes through to handle, forms the adhesive force that coarse surface corona layer strengthened the lamination. Therefore, the EVA adhesive film with the transparent structure not only enhances the adhesive force between layers, but also prevents the damage to the surface of the high-transparency base material layer 10 and prevents the influence on the high-transparency performance of the high-transparency base material layer. The thickness of the adhesive layer 30 is 4-20um, such as the thickness of the adhesive layer 30 is 4um, 8um, 12um, 16um, 20 um.

The release layer 50 is prepared from methyl silicone oil, and has good release performance, so that the release film has stable release force. Specifically, the methyl silicone oil is any one of methyl ethoxy silicone oil, methyl trifluoro propyl silicone oil and methyl vinyl silicone oil or a combination of any two of them in any ratio, and a thermosetting layer is formed on the adhesive layer 30 by dimple coating to form the release layer 50. The thickness of the release layer 50 is 2-5 um. For example, the thickness of the release layer 50 is 2um, 3um, 4um, 5 um. The coating weight of the release layer 50 is 1-1.5 g/square meter. For example, the coating weight of the release layer 50 is 1 g/square meter, 1.2 g/square meter, 1.4 g/square meter and 1.5 g/square meter. In this embodiment, the methyl ethoxy silicone oil is used for thermosetting to form the release layer 50, the thickness of the release layer 50 is 5um, and the coating weight of the release layer 50 is 1.2 g/square meter, but not limited thereto. In a preferred embodiment, the thickness of the adhesive layer 30 is greater than the thickness of the release layer 50, such as 5um for the release layer 50 and 6um for the adhesive layer 30, but not limited thereto.

Wherein the protective layer 70 is selected from a PP protective film, a BOPP scratch resistant film or a modified polyethylene wax layer. The modified polyethylene wax layer has the performances of scratch resistance and metal scratch resistance, and the phenomenon that the transmittance of the release film is damaged due to scratch and friction in the production and transportation processes is avoided, so that the overall transmittance of the OCA adhesive is influenced. The PP protective film has the advantages of dust prevention, high temperature resistance and easy peeling. The BOPP scratch-resistant film has scratch resistance, supports hot stamping and ultraviolet printing ink, and has a fine and smooth surface and a matte structure. In a preferred embodiment, the protective layer 70 is a modified polyethylene wax layer. Further, the modified polyethylene wax layer has a peel strength of 40 to 70g/cm, such as 40g/cm, 50g/cm, 60g/cm, and 70 g/cm. The thickness of the modified polyethylene wax layer is 2-10 um. In this embodiment, the thickness of the modified polyethylene wax layer is 10um, the middle and high viscosity, and the peel strength is 50g/cm, but not limited thereto.

Compared with the prior art, the release film 100 for the optical grade OCA is provided with the bonding layer 30, the release layer 50 and the protective layer 70 on at least one surface of the high-transparency base material layer 10 in sequence, and achieves high-transparency and low-haze effects by utilizing the light transmittance of the high-transparency base material layer 10 of 91-97% and the haze of 1-2.5%. Tie layer 30 is the transparent construction, and the luminousness reaches more than 91%, avoids causing the influence to optical grade OCA with leaving type membrane 100. The release layer 50 has good peeling performance, so that the release film has stable release force. The protective layer 70 has the performance of scratch resistance and metal scratch resistance, and prevents the light transmittance of the release film from being damaged by scratch and friction in the production and transportation processes, so that the light transmittance of the whole OCA adhesive is influenced.

It should be noted that the above-mentioned embodiments illustrate rather than limit the scope of the invention, and that modifications of various equivalent forms of the invention, which may occur to those skilled in the art after reading the present application, fall within the scope of the appended claims.

Claims

1. The utility model provides an optics level OCA is with leaving type membrane which characterized in that, includes the high substrate layer that passes through, in at least one side of the high substrate layer that passes through is equipped with the tie coat, in the another side of tie coat is equipped with from the type layer, in the another side from the type layer is equipped with the protective layer, the luminousness that the high substrate layer that passes through is 91-97% and the haze is 1-2.5%, the tie coat is transparent structure.

2. The release film for optical grade OCA according to claim 1, wherein the thickness of the high-transmittance substrate layer is 5 to 100 um.

3. The release film for optical grade OCA of claim 1, wherein the thickness of the adhesive layer is greater than the thickness of the release layer.

4. The release film for optical grade OCA according to claim 1, wherein the thickness of the adhesive layer is 4-20 um.

5. The release film for optical grade OCA according to claim 1, wherein the thickness of the release layer is 2-5 um.

6. The release film for optical grade OCA according to claim 1, wherein the coating amount of the release layer is 1-1.5g per square meter.

7. The release film for optical grade OCA according to claim 1, wherein the thickness of the protective layer is 2-50 um.

8. The release film for optical grade OCA according to claim 1, wherein the protective layer is selected from a PP protective film, a BOPP scratch resistant film or a modified polyethylene wax layer.

9. The release film for optical grade OCA according to claim 8, wherein the modified polyethylene wax layer has a peel strength of 40 to 70 g/cm.

10. The release film for optical grade OCA according to claim 1, wherein the adhesive layer is an EVA adhesive film.