Double-faced adhesive tape for polaroid and preparation process of double-faced adhesive tape

Abstract

The invention relates to a double-faced adhesive tape for a polaroid and a preparation process of the double-faced adhesive tape. The double-faced adhesive tape for the polaroid sequentially comprises a release layer, an acrylic acid pressure-sensitive adhesive layer, a base material layer, an organic silicon pressure-sensitive adhesive layer and a stripping layer from top to bottom, the release layer is connected with the acrylic acid pressure-sensitive adhesive layer, and one surface, back to the release layer, of the acrylic acid pressure-sensitive adhesive layer is connected with the base material layer; one surface, back to the acrylic acid pressure-sensitive adhesive layer, of the base material layer is connected with the organic silicon pressure-sensitive adhesive layer, and one surface, back to the base material layer, of the organic silicon pressure-sensitive adhesive layer is connected with one surface of the stripping layer. The double faced adhesive tape for the polaroid can effectively eliminate the influence of polarized light, can effectively solve the influence of colorful polarized light under a polarized lens, and meets the requirement that a user wears polarized glasses to normally watch high-quality pictures of a mobile phone. In addition, the double faced adhesive tape for the polaroid has high transparency, and the problem that a flash point exists after a screen is lightened is solved.

Description

Technical Field

[0001] The invention relates to the field of polarized glasses manufacturing, in particular to a double-sided adhesive tape for polarized films and a preparation process thereof. Background Art

[0002] The full name of polarizer is polarizing film. The reason why polarizer is called polarizer is that the polarizer facing the eyes of ordinary LCD is frosted to dissipate surface reflection and scatter light to increase the viewing angle of LCD. For projectors, any scattering will cause light loss. The ideal state of the LCD used in projectors should be 0 degree viewing angle, that is, there will be no light when looking at the LCD from the vertical direction. Of course, this is impossible to achieve, but the closer to 0 degree viewing angle, the higher the utilization rate of light. Therefore, after replacing the frosted polarizer with a flat polarizer, the brightness of the projector to the wall will be greatly improved, about 50-80%, which is why the polarizer should be replaced. Polarized glasses are a kind of sunglasses. Polarized sunglasses have the function of polarizing light, so they can block all harmful light without affecting the transmission of visible light, and can truly protect the eyes. In addition to the basic UV protection function, polarized sunglasses also have anti-glare, road reflection light, water scale light, etc., suitable for driving, fishing, travel, and daily wear.

[0003] However, when users wear polarized glasses, they are prone to produce colorful polarized light when viewing their mobile phones, which seriously affects the presentation quality of the mobile phone screen. The quality can only be slightly improved by adjusting the angle of the mobile phone. This cannot meet the needs of users to watch high-quality mobile phone screens normally while wearing polarized glasses. The traditional adhesive used for the polarizer in polarized glasses does not have the function of eliminating polarized light. Summary of the invention

[0004] Based on this, it is necessary to provide a double-sided adhesive for polarizer and its preparation process to address the technical problem that the traditional adhesive used for polarizer in polarized glasses does not have the function of eliminating polarized light.

[0005] A double-sided adhesive for a polarizer, the double-sided adhesive for a polarizer comprising, from top to bottom, a release layer, an acrylic pressure-sensitive adhesive layer, a substrate layer, a silicone pressure-sensitive adhesive layer and a peeling layer; The release layer is connected to the acrylic pressure-sensitive adhesive layer, and the side of the acrylic pressure-sensitive adhesive layer facing away from the release layer is connected to the substrate layer; the side of the substrate layer facing away from the acrylic pressure-sensitive adhesive layer is connected to the silicone pressure-sensitive adhesive layer, and the side of the silicone pressure-sensitive adhesive layer facing away from the substrate layer is connected to one side of the peeling layer.

[0006] In one embodiment, the release layer is a PET release film.

[0007] In one embodiment, the release layer is a silicone oil release film.

[0008] In one embodiment, the thickness of the release layer is 25 micrometers to 100 micrometers.

[0009] In one embodiment, the substrate layer is one of SRF, HPU and TAC.

[0010] In one embodiment, the thickness of the substrate layer is 50 micrometers to 100 micrometers.

[0011] In one embodiment, the peeling layer is a PET release film.

[0012] In one embodiment, the thickness of the release layer is 25 micrometers to 100 micrometers.

[0013] In one embodiment, the acrylic pressure-sensitive adhesive layer has a thickness of 60 micrometers to 150 micrometers.

[0014] A preparation process of a double-sided adhesive tape for a polarizer, used to prepare the double-sided adhesive tape for a polarizer described in any of the above embodiments, the process comprising the following steps: The substrate layer preparation step includes coating an aliphatic polyurethane resin on a release surface of a highly transparent release film, covering the aliphatic polyurethane resin layer with another highly transparent release film, and UV curing the aliphatic polyurethane resin layer to form a substrate layer with highly transparent release films adhered to both sides; The step of coating the organic silicone pressure-sensitive adhesive layer is as follows: tearing off a high-transparency release film on any side of the substrate layer, subjecting the exposed side of the substrate layer to corona treatment, and coating the exposed side of the substrate layer with an organic silicone pressure-sensitive adhesive after the corona treatment; Release film adhesion step: After the substrate layer coated with the silicone pressure-sensitive adhesive is cured in a drying oven, it is covered with a PET release film as a release layer; Acrylic pressure-sensitive adhesive coating step: tear off another high-transparency release film on the substrate layer, and apply acrylic pressure-sensitive adhesive on the exposed side of the substrate layer; Release layer adhesion step: Cover the acrylic pressure-sensitive adhesive with a PET release film or a silicone release film as a release layer.

[0015] The above-mentioned double-sided adhesive tape for polarizer can effectively eliminate the influence of polarized light, and can effectively solve the influence of colorful polarized light under polarized lenses, meeting the needs of users to watch high-quality mobile phone images normally while wearing polarized glasses. In addition, the above-mentioned double-sided adhesive tape for polarizer has high transmittance, which solves the problem of flash points after the screen is turned on. The preparation process steps of the above-mentioned double-sided adhesive tape for polarizer are concise and exquisite, easy to control, and each step is carefully and meticulously. The double-sided adhesive tape for polarizer obtained by the above-mentioned preparation process of double-sided adhesive tape for polarizer can effectively eliminate the influence of polarized light. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 A schematic diagram of the structure of a double-sided adhesive tape for a polarizer in one embodiment; Figure 2 The figure is a schematic diagram of a process for preparing a double-sided adhesive tape for a polarizer in one embodiment. DETAILED DESCRIPTION

[0017] In order to make the purpose, technical solution and advantages of the present invention clearer, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention. In order to make the above-mentioned purposes, features and advantages of the present invention more obvious and easy to understand, the specific implementation methods of the present invention are described in detail below in conjunction with the accompanying drawings. In the following description, many specific details are set forth to facilitate a full understanding of the present invention. However, the present invention can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without violating the connotation of the present invention, so the present invention is not limited by the specific embodiments disclosed below. In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate the orientation or position relationship based on the orientation or position relationship shown in the accompanying drawings, which is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation of the present invention.

[0018] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of the present invention, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0019] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0020] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being "above", "above" or "above" a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being "below", "below" or "below" a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0021] It should be noted that when an element is referred to as being "fixed to" or "disposed on" another element, it may be directly on the other element or there may be a central element. When an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be a central element at the same time. The terms "vertical", "horizontal", "upper", "lower", "left", "right" and similar expressions used herein are for illustrative purposes only and are not intended to be the only implementation method.

[0022] See also Figure 1 The present invention provides a double-sided adhesive tape 10 for a polarizer, which includes a release layer 100, an acrylic pressure-sensitive adhesive layer 200, a substrate layer 300, a silicone pressure-sensitive adhesive layer 400 and a peeling layer 500 from top to bottom.

[0023] In the present embodiment, the release layer 100 is a PET release film. In another embodiment, the release layer 100 is a silicone release film. The release force of the silicone release film is 5 gf / 25mm to 12 gf / 25mm, the light transmittance of the silicone release film is greater than 90%, and the haze is less than 1%. Further, the thickness of the release layer 100 is 25 microns to 100 microns. Specifically, in the present embodiment, the thickness of the release layer 100 is 50 microns. In another embodiment, the thickness of the release layer 100 is 75 microns. In other embodiments, the thickness of the release layer 100 is 38 microns.

[0024] The release layer 100 is connected to the acrylic pressure-sensitive adhesive layer 200. The thickness of the acrylic pressure-sensitive adhesive layer 200 is 60 microns to 150 microns. Specifically, the acrylic pressure-sensitive adhesive layer is a solvent-free UV acrylic pressure-sensitive adhesive. In this embodiment, the thickness of the solvent-free UV acrylic pressure-sensitive adhesive is 80 microns to 90 microns. The light transmittance of the solvent-free UV acrylic pressure-sensitive adhesive is greater than 92%, the haze is less than 0.5%, and the refractive index is 1.4 to 1.45. In another embodiment, the acrylic pressure-sensitive adhesive layer is a solvent acrylic pressure-sensitive adhesive. The side of the acrylic pressure-sensitive adhesive layer 200 facing away from the release layer 100 is connected to the substrate layer 300. In this embodiment, the substrate layer 300 is one of SRF, HPU and TAC. HPU is a coating-molded aliphatic polyurethane resin, the refractive index of the coating-molded aliphatic polyurethane resin is 1.47 to 1.50, and the functionality of the aliphatic polyurethane resin is preferably 3-4. In this embodiment, the thickness of the substrate layer 300 is 50 microns to 100 microns. Specifically, the thickness of the substrate layer 300 is 70 microns.

[0025] The side of the substrate layer 300 facing away from the acrylic pressure-sensitive adhesive layer 200 is connected to the organic silicon pressure-sensitive adhesive layer 400. In this embodiment, the organic silicon pressure-sensitive adhesive layer 400 is organic silica gel. The peeling force of the organic silicon pressure-sensitive adhesive layer 400 is 1 gf / 25mm to 10 gf / 25mm, and further, the peeling force of the organic silicon pressure-sensitive adhesive layer 400 is 3 gf / 25mm to 5 gf / 25mm. In this embodiment, the thickness of the organic silicon pressure-sensitive adhesive layer is 30 microns.

[0026] The side of the silicone pressure-sensitive adhesive layer 400 facing away from the substrate layer 300 is connected to the side of the peeling layer 500. In the present embodiment, the peeling layer 500 is a PET release film. The thickness of the peeling layer 500 is 25 microns to 100 microns. Further, in the present embodiment, the thickness of the peeling layer 500 is 75 microns. In another embodiment, the thickness of the peeling layer 500 is 38 microns. In yet another embodiment, the thickness of the peeling layer 500 is 50 microns. The light transmittance of the peeling layer 500 is greater than 90%, and the haze is less than 1%.

[0027] The above-mentioned double-sided adhesive tape 10 for polarizer can effectively eliminate the influence of polarized light, can effectively solve the influence of colorful polarized light under polarized lenses, and meet the needs of users wearing polarized glasses to watch high-quality mobile phone images normally. In addition, the above-mentioned double-sided adhesive tape 10 for polarizer has high transmittance, which solves the problem of flash points after the screen is turned on.

[0028] See also Figure 2 The present invention also provides a preparation process of a double-sided adhesive tape for a polarizer, which is used to prepare the double-sided adhesive tape 10 for a polarizer described in any of the above embodiments, and the process comprises the following steps: Step 101: Preparation step of substrate layer 300: apply aliphatic polyurethane resin to the release surface of a high-transmittance release film, cover the aliphatic polyurethane resin layer with another high-transmittance release film, and UV cure to form a substrate layer 300 with high-transmittance release films adhered to both sides.

[0029] Step 102: Silicone pressure-sensitive adhesive layer 400 coating step: tear off a high-transparency release film on either side of the substrate layer 300, perform corona treatment on the exposed side of the substrate layer 300, and then apply silicone pressure-sensitive adhesive on the exposed side of the substrate layer 300 after corona treatment.

[0030] Step 103: Peeling film adhesion step: After the substrate layer 300 coated with the silicone pressure-sensitive adhesive is cured in a drying oven, it is covered with a PET release film as the peeling layer 500 .

[0031] Step 104: Acrylic pressure-sensitive adhesive coating step: tear off another high-transparency release film on the substrate layer 300 , and apply acrylic pressure-sensitive adhesive on the exposed side of the substrate layer 300 .

[0032] Step 105: Step of adhering the release layer 100: Covering the acrylic pressure-sensitive adhesive with a PET release film or a silicone release film as the release layer 100 .

[0033] The preparation process steps of the double-sided adhesive tape 10 for polarizer are concise, exquisite and easy to control. Each step is carefully and meticulously performed. The double-sided adhesive tape 10 for polarizer obtained by the preparation process of the double-sided adhesive tape 10 for polarizer can effectively eliminate the influence of polarized light. It meets the needs of users wearing polarized glasses to watch high-quality mobile phone pictures normally. In addition, the double-sided adhesive tape 10 for polarizer has high transmittance, which solves the problem of flash points after the screen is turned on.

[0034] The technical features of the above embodiments may be combined arbitrarily. To make the description concise, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0035] The above-mentioned embodiments only express several implementation methods of the present invention, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the invention patent. It should be pointed out that, for ordinary technicians in this field, several variations and improvements can be made without departing from the concept of the present invention, and these all belong to the protection scope of the present invention. Therefore, the protection scope of the patent of the present invention shall be subject to the attached claims.

Claims

1. A double-sided tape for polarizer, characterized in that: From top to bottom, it includes a release layer, an acrylic pressure-sensitive adhesive layer, a substrate layer, a silicone pressure-sensitive adhesive layer and a peeling layer; The release layer is connected to the acrylic pressure-sensitive adhesive layer, and the side of the acrylic pressure-sensitive adhesive layer facing away from the release layer is connected to the substrate layer; the side of the substrate layer facing away from the acrylic pressure-sensitive adhesive layer is connected to the silicone pressure-sensitive adhesive layer, and the side of the silicone pressure-sensitive adhesive layer facing away from the substrate layer is connected to one side of the peeling layer.

2. The double-sided adhesive tape for polarizer according to claim 1, characterized in that: The release layer is a PET release film.

3. The double-sided adhesive tape for polarizer according to claim 1, characterized in that: The release layer is a silicone oil release film.

4. The double-sided adhesive tape for polarizer according to claim 1, characterized in that: The thickness of the release layer is 25 micrometers to 100 micrometers.

5. The double-sided adhesive tape for polarizer according to claim 1, characterized in that: The substrate layer is one of SRF, HPU and TAC.

6. The double-sided tape for polarizer according to claim 1, characterized in that: The thickness of the substrate layer is 50 micrometers to 100 micrometers.

7. The double-sided adhesive tape for polarizer according to claim 1, characterized in that: The peeling layer is a PET release film.

8. The double-sided adhesive tape for polarizer according to claim 1, characterized in that: The peeling layer has a thickness of 25 micrometers to 100 micrometers.

9. The double-sided tape for polarizer according to claim 1, characterized in that: The thickness of the acrylic pressure-sensitive adhesive layer is 60 micrometers to 150 micrometers.

10. A process for preparing a double-sided adhesive tape for polarizer, used for preparing the double-sided adhesive tape for polarizer as claimed in any one of claims 1 to 9, characterized in that: The process comprises the following steps: The substrate layer preparation step includes coating an aliphatic polyurethane resin on a release surface of a highly transparent release film, covering the aliphatic polyurethane resin layer with another highly transparent release film, and UV curing the aliphatic polyurethane resin layer to form a substrate layer with highly transparent release films adhered to both sides; The step of coating the organic silicone pressure-sensitive adhesive layer is as follows: tearing off a high-transparency release film on any side of the substrate layer, subjecting the exposed side of the substrate layer to corona treatment, and coating the exposed side of the substrate layer with an organic silicone pressure-sensitive adhesive after the corona treatment; Release film adhesion step: After the substrate layer coated with the silicone pressure-sensitive adhesive is cured in a drying oven, it is covered with a PET release film as a release layer; Acrylic pressure-sensitive adhesive coating step: tear off another high-transparency release film on the substrate layer, and apply acrylic pressure-sensitive adhesive on the exposed side of the substrate layer; Release layer adhesion step: Cover the acrylic pressure-sensitive adhesive with a PET release film or a silicone release film as a release layer.

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