Single-sided pressure-sensitive adhesive tape

Abstract

The utility model provides a single-sided pressure-sensitive adhesive tape. The single-sided pressure-sensitive adhesive tape comprises: an ink layer having a thickness of 3 [mu] m-6 [mu] m; the backing layer is arranged on one side of the ink layer, and the thickness of the backing layer ranges from 1.0 micrometer to 2.0 micrometers; the adhesive layer is arranged on the side, away from the ink layer, of the backing layer, and the thickness of the adhesive layer ranges from 1.0 micrometer to 1.5 micrometers. The single-sided pressure-sensitive adhesive tape disclosed by the utility model is relatively small in thickness, and has the characteristics of static electricity prevention, shading, stray light prevention, alcohol resistance, scratch resistance, fingerprint resistance and the like.

Description

Technical Field

[0001] The utility model relates to a single-sided pressure-sensitive adhesive tape with reduced thickness suitable for electronic products. Background Art

[0002] Adhesive tapes are increasingly used in production and daily life, often used to bond device structures. As the application areas continue to expand, the performance requirements for adhesive tapes are becoming increasingly higher. In the field of electronic equipment, some electronic applications on the market require ultra-thin adhesive tapes to adapt to their special structural designs.

[0003] Currently, with the development of increasingly miniaturized electronic products, the thickness design of adhesive tapes suitable for electronic products cannot meet the market demand for thinner pressure-sensitive tapes. Utility Model Content

[0004] The utility model aims to provide a single-sided pressure-sensitive adhesive tape with reduced thickness and a functional ink layer.

[0005] The above-mentioned utility model object of the present invention is achieved through the following technical solutions.

[0006] (1) A single-sided pressure-sensitive adhesive tape, characterized in that it comprises: an ink layer with a thickness of 3 μm to 6 μm; a backing layer, the backing layer being arranged on one side of the ink layer and having a thickness of 1.0 μm to 2.0 μm; and an adhesive layer, the adhesive layer being arranged on a side of the backing layer away from the ink layer and having a thickness of 1.0 μm to 1.5 μm.

[0007] (2) The single-sided pressure-sensitive adhesive tape according to item (1) above, characterized in that the ink layer includes a black layer with a thickness of 1.5 μm to 3.0 μm and a matte layer with a thickness of 1.5 μm to 3.0 μm.

[0008] (3) The single-sided pressure-sensitive adhesive tape according to item (1) or (2) above, characterized in that the thickness of the ink layer is 3 μm, the thickness of the backing layer is 1.5 μm to 2.0 μm, and the thickness of the adhesive layer is 1.0 μm to 1.5 μm.

[0009] (4) The single-sided pressure-sensitive tape according to item (1) or (2) above is characterized in that the single-sided pressure-sensitive tape also includes a release layer provided on the side of the adhesive layer away from the backing layer, and the thickness of the release layer is 50 μm.

[0010] (5) The single-sided pressure-sensitive adhesive tape according to item (1) or (2) above, characterized in that the adhesive layer is an acrylic pressure-sensitive adhesive material layer.

[0011] According to the utility model, the following beneficial technical effects can be produced:

[0012] Through the structural combination of the ink layer, the backing layer and the adhesive layer, the single-sided pressure-sensitive tape has further properties such as anti-static, insulation, light-shielding, anti-stray light, alcohol resistance, scratch resistance, fingerprint resistance and sustainability while having a reduced thickness. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 Schematic diagram of the structure of a single-sided pressure-sensitive adhesive tape according to the present invention, the single-sided pressure-sensitive adhesive tape comprises a black layer 1, a matte layer 2, a backing layer 3, an adhesive layer 4 and a release layer 5. DETAILED DESCRIPTION

[0014] To make the purpose, technical solutions, and advantages of the embodiments of the present invention more clear, the technical solutions of the present invention will be clearly and completely described below in conjunction with the following specific embodiments. Obviously, the specific embodiments described are only a portion of the embodiments of the present invention. Based on the described embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0015] According to some embodiments of the present invention, the adhesive tape comprises: an ink layer, a backing layer 3 provided on one side of the ink layer, an adhesive layer 4 provided on a side of the backing layer away from the ink layer, and a release layer 5 on a side of the adhesive layer away from the backing layer, wherein the ink layer comprises a black layer 1 and a matte layer 2, as shown in FIG. Figure 1 shown.

[0016] According to some embodiments of the present invention, the ink layer includes a black layer and a matte layer, wherein the thickness of the black layer is 1.5 μm to 3.0 μm, preferably 1.5 to 2.5 μm, and more preferably 1.5 to 2.0 μm, for example, 1.6 μm, 1.7 μm, 1.8 μm, or 1.9 μm; the thickness of the matte layer is 1.5 μm to 3.0 μm, preferably 1.5 to 2.5 μm, and more preferably 1.5 to 2.0 μm, for example, 1.6 μm, 1.7 μm, 1.8 μm, or 1.9 μm. The black layer may contain polyurethane resin, carbon black pigment, and additives, and the matte layer may contain polyurethane resin, silica, and additives.

[0017] The black layer can control the OD value of the pressure-sensitive adhesive tape, and the matte layer can control the surface energy of the pressure-sensitive adhesive tape. By adjusting the crosslinking degree of the matte layer, its dyne value can be changed, or the surface energy can be controlled by adjusting the glossiness of the matte layer to a lower value and its roughness to a higher value.

[0018] By using an ink layer comprising a combination of a black layer and a matte layer, the tape can further have functions such as anti-static, insulation, light-shielding, black stray light protection, conductivity, flame retardancy, primer bridging or white reflective layer while reducing its thickness.

[0019] According to some embodiments of the present invention, the backing layer disposed on one side of the ink layer may have a thickness of 1.0 μm to 2.0 μm, preferably 1.5 μm to 2.0 μm, for example, 1.6 μm, 1.7 μm, 1.8 μm, or 1.9 μm. The backing layer may include at least one of polyethylene terephthalate (PET), polycarbonate, polyimide, polyurethane, and polymethyl methacrylate materials, and post-industrial recycled (PIR) materials, preferably polyethylene terephthalate (PET) and post-industrial recycled polyethylene terephthalate (PIR-PET) materials.

[0020] According to some embodiments of the present invention, the adhesive layer disposed on the side of the backing layer away from the ink layer may have a thickness of 1.0 μm to 1.5 μm, for example, 1.1 μm, 1.2 μm, 1.3 μm, or 1.4 μm. The main component of the adhesive layer, a pressure-sensitive adhesive (PSA), may include at least one of acrylate, natural rubber, synthetic rubber, and silicone adhesive, for example, an acrylic pressure-sensitive adhesive or an acrylic pressure-sensitive adhesive with a bio-based content of 75%.

[0021] According to some embodiments of the present invention, the release layer on the side of the adhesive layer away from the backing layer has a thickness of about 50 μm. The release layer is a PET release film, a PP release film, etc., for example, a PET release film with a recycling rate of 30% to 100%.

[0022] Example

[0023] The embodiments of the present invention are merely used to exemplarily describe the technical solutions of the present invention, but do not mean that the technical solutions of the present invention are limited to these specific embodiments.

[0024] The embodiments of the present invention use the following test methods to test the initial peel force, Lab value, surface energy, gloss and optical density, tensile strength and elongation, biobased content, material recycling ratio, carbon dioxide emissions, and alcohol resistance, scratch resistance, and fingerprint resistance of the tape.

[0025] 1. Test Method

[0026] (1) Initial peel force test

[0027] The utility model tests the initial peeling force of the adhesive tape on the SUS board, PC board and glass board. The specific test method is as follows.

[0028] The peeling force of the present invention is measured under the conditions of a temperature of 23°C ± 1°C and a relative humidity of 50% ± 5%. The tape sample is cut into a size of 20 mm × 150 mm and adhered to each plate with a water drop angle of 110 ± 5° and a surface roughness of Ra = 0.009 ± 0.001. The surface of each plate is cleaned and conditioned with an organic detergent before measurement. The tape sample is then rolled onto each plate in the following manner: a 4 kg roller is rolled back and forth on the tape sample 5 times at a rolling rate of 10 m / min. After the rolling treatment, the plate is immediately inserted into a Zwick Roell tensile testing machine to allow the tape sample to be peeled at an angle of 180°. The peeling force is measured at a speed of 300 mm / min using the testing machine (sensor: 100 N). The test result of each sample is represented by the average value (N / cm) of three measurement results.

[0029] (2) Lab test

[0030] The utility model tests the Lab value of the tape sample, and the Lab test method is carried out according to DIN 5033-3.

[0031] Light source / light source standard: D65

[0032] Viewing angle: 10°

[0033] The specimens were measured relative to a white reference tile. The measured data were plotted as L*a*b* values ​​relative to the white reference tile.

[0034] dE94 can be obtained according to the existing color difference formula. The specific color difference formula is as follows:

[0035]

[0036] S L =1

[0037]

[0038] (3) Surface energy test

[0039] The test method is based on the wettability of test inks with different surface energies on the test surface. The test ink is applied to the pre-cleaned test surface and the ink is immediately observed. The test method is carried out according to DIN 53364.

[0040] When testing, first select a test ink with an intermediate surface energy, such as 38 mN / m, as a starting point. During the surface energy test, use a test pen to apply the intermediate test ink to the surface to be tested. If the test ink from the test pen wets the surface to be tested within 2 seconds, the surface energy of the surface to be tested is greater than or equal to the surface energy of the test ink (the intermediate value). Then, select a test pen with a higher surface energy and perform a second test. This process continues until the test ink shrinks to a bead (spherical) shape within 2 seconds. At this point, the surface energy of the test ink used in the previous test corresponds to the surface energy of the surface to be tested.

[0041] (4) Gloss and optical density test

[0042] The glossiness is measured in accordance with ASTM D 2457. The optical density (OD value) can be measured using a spectrometer UV4100 (manufactured by Hitachi High-Technologies Corporation).

[0043] (5) Tensile strength and elongation test

[0044] Tensile Strength: At 23±1°C, 50±5% humidity, cut a specimen into 200 mm x 10 mm pieces and clamp the specimen between the ends of a Zwick Roell Z020 tensile tester (Zwick GmbH) with the initial test length horizontal. Tensile strength is measured at a rate of 300 mm / min with the tape length in the machine direction and the width in the vertical direction. The normal break strength is recorded as the average of five replicates (unit: N / cm).

[0045] Elongation: At 23±1°C, 50±5% humidity, cut a specimen into 200 mm x 10 mm pieces and clamp the specimen between the ends of a Zwick Roell Z020 tensile tester (from Zwick GmbH) with the initial test length horizontal. The test length is 100 mm, with the tape length in the machine direction and the tape width in the vertical direction. Stretch at a rate of 300 mm / min. Record the elongation at break under normal conditions. The average value of five replicates is reported in %.

[0046] (6) Biobased content test

[0047] The biobased content is assessed according to ASTM D 6866-18. It is quantitatively assessed by measuring the radioactive isotope C14. The higher the value, the greater the proportion of natural origin in the material.

[0048] (7) Material recycling ratio

[0049] Calculate the material usage recycling ratio based on the traced supply chain.

[0050] (8) Carbon dioxide emission reduction test

[0051] CO2 emissions primarily refer to emissions from manufacturing; indirect emissions from purchased electricity, steam, heat, and other energy sources; and indirect emissions from upstream materials production. Define the functional unit for calculation and multiply by the CO2 emissions index of the raw materials per functional unit. If the calculation involves adhesive tape, additionally add the direct and indirect energy consumption per functional unit of the manufacturing process.

[0052] (9) Alcohol resistance, scratch resistance and fingerprint resistance test

[0053] Alcohol resistance: Wrap the wipe paper around 4cm of a 1kg weight 2 On the wiping head, soak the wiping head with alcohol and then place it on the ink surface. The contact area is 4cm 2 , drag the weight at a constant speed by hand and wipe it in one direction 10 times. If no ink falls off after wiping 10 times, the test passes. If obvious ink falls off after wiping 10 times, the test fails.

[0054] Scratch resistance: At 23±1°C and 50±5% humidity, fix the tape sample to be tested on a 50mm×200mm glass plate. Move a pressure-adjustable test pen across the surface. The result is the minimum force required for the tip of the pen to penetrate the sample. This test result is equivalent to that of ISO 1518. The main difference is that the test pen is moved manually across the test surface and the force is set by a spring within the pen. Test equipment: Erichsen Hardness Test Pencil Model 318

[0055] Fingerprint resistance: At 23±1℃ and 50±5% humidity, fix the tape sample to be tested on a metal plate. Five random people will touch the surface of the tape sample with their fingers in turn to observe whether there are any fingerprints left on the surface of the tape sample.

[0056] 2. Raw materials and preparation processes used

[0057] 2.1 Raw Materials Used in the Adhesive Tapes of Examples and Comparative Examples

[0058] Examples 1 to 3

[0059] The adhesive tape according to this embodiment includes an ink layer, a backing layer, an adhesive layer, and a release layer.

[0060] Among them, the ink layer includes a black layer and a matte layer. The black layer is made of polyurethane resin, carbon black pigment and additives; the matte layer is made of polyurethane resin, silica and additives; the backing layer is polyethylene terephthalate (PET) and post-industrial recycled polyethylene terephthalate (PIR-PET) material; the adhesive layer is an acrylic pressure-sensitive adhesive with a bio-based content of 75%; the release layer is a PET release film with a recycling rate of 30% to 100%.

[0061] Comparative Example 1

[0062] The tape of Comparative Example 1 is a conventional tape comprising a backing layer and an adhesive layer. The backing layer in the comparative example is polyethylene terephthalate (PET); the adhesive layer is a petroleum-based acrylic pressure-sensitive adhesive; the release layer is a PET release film, and there is no ink layer.

[0063] 2.2 Preparation process of adhesive tape in the embodiment

[0064] The ink layer, the backing layer and the adhesive layer are sequentially laminated by providing appropriate pressure through a laminating device, for example, by rolling to form a tape.

[0065] 3. Structure of Examples and Comparative Examples

[0066] Table 1. Thickness of each layer in Examples and Comparative Examples

[0067]

[0068] Table 2. Effects of different structures and thicknesses on tape performance

[0069]

[0070] As shown in Tables 1 and 2 above, the single-sided pressure-sensitive adhesive tapes of Examples 1 to 3 of the present invention, while having a significantly reduced overall thickness, exhibit higher initial peel forces on various material surfaces than Comparative Example 1, and possess comparable tensile strength and elongation to those of Comparative Example 1. Furthermore, while maintaining a reduced overall thickness, the single-sided pressure-sensitive adhesive tapes of the present invention incorporate an ink layer structure, which increases the tape's surface energy, significantly reduces gloss, improves optical density, and exhibits alcohol resistance, scratch resistance, and fingerprint resistance.

[0071] The downstream application areas of this utility model's single-sided pressure-sensitive adhesive tape include consumer electronics, automobiles, semiconductors, and other fields, especially in the consumer electronics field. Specifically, the single-sided pressure-sensitive adhesive tape with this utility model structure has the advantages of being lightweight, ultra-thin, with excellent flatness and various good surface properties. It is suitable for application devices such as smartphones, personal computers, and e-readers, making this utility model's ultra-thin single-sided pressure-sensitive adhesive tape have a huge market demand.

[0072] The ultra-thin thickness of the single-sided pressure-sensitive tape and its incorporated ink layer structure allow it to be used as a product backing sticker, enhancing the product's appearance. Printing, such as the product name and information, can be performed on the surface of the tape's ink layer. Furthermore, while the single-sided pressure-sensitive tape with the structure of the present invention boasts reduced thickness, it also offers excellent light-shielding properties, further protecting products from fingerprints, glare, scratches, and alcohol damage.

[0073] The above is a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principles described in the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.

Claims

1. A single-sided pressure-sensitive adhesive tape, characterized in that: include: Ink layer, thickness of 3μm to 6μm; A backing layer, which is disposed on one side of the ink layer and has a thickness of 1.0 μm to 2.0 μm; as well as The adhesive layer is arranged on a side of the backing layer away from the ink layer and has a thickness of 1.0 μm to 1.5 μm.

2. The single-sided pressure-sensitive adhesive tape according to claim 1, characterized in that The ink layer includes a black layer with a thickness of 1.5 μm to 3.0 μm and a matte layer with a thickness of 1.5 μm to 3.0 μm.

3. The single-sided pressure-sensitive adhesive tape according to claim 1 or 2, characterized in that: The thickness of the ink layer is 3 μm, the thickness of the backing layer is 1.5 μm to 2.0 μm, and the thickness of the adhesive layer is 1.0 μm to 1.5 μm.

4. The single-sided pressure-sensitive adhesive tape according to claim 1 or 2, characterized in that: The single-sided pressure-sensitive adhesive tape further includes a release layer provided on a side of the adhesive layer away from the backing layer, and the thickness of the release layer is 50 μm.

5. The single-sided pressure-sensitive adhesive tape according to claim 1 or 2, characterized in that: The adhesive layer is an acrylic pressure-sensitive adhesive material layer.

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