A low-VOC easy-pull adhesive tape and preparation method thereof

Abstract

The invention discloses a low-VOC easy-pull adhesive tape and a preparation method thereof, and relates to the technical field of adhesive materials, including a first release layer, an easy-pull adhesive layer and a second release layer; the easy-pull adhesive layer includes the following raw material components by weight: 3-6 parts of amino-terminated hyperbranched polysiloxane, 1-3 parts of 1,3-bis(oxiranylmethyl)-5-(2-propylene)-1,3,5-triazine-2,4,6(1H,3H,5H)-trione, 30-40 parts of ethylene acrylic elastomer, 10-20 parts of diluent, 2-5 parts of talc, 1-3 parts of aliphatic conjugated diene monomers, 1-2 parts of vinyl trimethoxysilane, 3-5 parts of other monomers, 0.5-1 parts of photoinitiator, and 0.8-1.2 parts of defoamer. The adhesive tape has sufficient tensile performance, high bonding strength, no residual glue when pulled out, and good environmental performance.

Description

Technical Field

[0001] The present invention relates to the technical field of adhesive materials, and in particular to a low-VOC easy-to-pull adhesive tape and a preparation method thereof. Background Art

[0002] In the consumer electronics, home appliances and other industries, users are increasingly pursuing products with a thin and delicate appearance, and pursuing personalization and fresh experiences. The pace of product replacement has also accelerated, and higher requirements have been placed on the assembly, maintenance, and even recycling of various components. In particular, batteries that pollute the environment must be able to be disassembled without loss, and they must be permanently bonded during assembly to achieve reliable performance. It is in this situation that easy-pull tape came into being. Easy-pull tape can achieve a firm bond between the battery and the motherboard in a direction perpendicular to the bonding interface, but in a direction parallel to the bonding interface, the tape can be easily pulled out through the reserved handle end, and there is no adhesive residue.

[0003] Existing easy-to-pull tapes have more or less insufficient tensile properties, the bonding strength needs to be further improved, and there are technical problems such as adhesive residue after pulling out. In addition, the easy-to-pull tapes on the market have a high content of volatile organic compounds (VOCs) and have a great impact on the environment. For example, the Chinese invention patent with the authorization announcement number CN108570293B discloses a substrate-free easy-to-pull removable tape, the thickness of which is 20-300μm, and its components and mass parts are: 80-150 parts of thermoplastic rubber, 60-150 parts of tackifying resin, 100-330 parts of toluene, 1-30 parts of softener, 1-10 parts of color paste, and 0.1-1 part of leveling agent. The substrate-free tape is a double-sided fixed tape with high bonding strength. It does not require pretreatment when used. It can be used after peeling off the release paper or release film. When it needs to be removed, it can be removed by stretching the tape, which can bring great convenience to the staff during the repair and maintenance of electronic components. However, the easy-to-pull tape has insufficient tensile properties and a high VOC content, which results in poor environmental performance.

[0004] It can be seen that the development of a low-VOC easy-pull tape with sufficient tensile properties, high bonding strength, no adhesive residue after pulling out, and good environmental performance and its preparation method meet market demand, have broad market value and application prospects, and are of great significance to promoting the development of the field of environmentally friendly easy-pull tapes. Summary of the invention

[0005] The main purpose of the present invention is to provide a low-VOC easy-to-pull adhesive tape with sufficient tensile performance, high bonding strength, no adhesive residue after pulling out, and good environmental performance, and a preparation method thereof.

[0006] To achieve the above purpose, the present invention provides a low-VOC easy-to-pull adhesive tape, comprising a first release layer, an easy-to-pull adhesive layer and a second release layer; the easy-to-pull adhesive layer comprises the following raw material components in parts by weight: 3-6 parts of amino-terminated hyperbranched polysiloxane, 1-3 parts of 1,3-bis(oxiranylmethyl)-5-(2-propenyl)-1,3,5-triazine-2,4,6(1H,3H,5H)-trione, 30-40 parts of ethylene acrylic elastomer, 10-20 parts of diluent, 2-5 parts of talc, 1-3 parts of aliphatic conjugated diene monomers, 1-2 parts of vinyl trimethoxy silane, 3-5 parts of other monomers, 0.5-1 parts of photoinitiator, and 0.8-1.2 parts of defoaming agent.

[0007] Preferably, the thickness of the first release layer is 20-100 μm, the thickness of the easy-to-pull adhesive layer is 100-150 μm, and the thickness of the second release layer is 20-100 μm.

[0008] Preferably, the first release layer and the second release layer are made of materials independently of each other and are any one of PET release film, CPP film, OPP film, BOPP film and release paper.

[0009] Preferably, the defoamer is at least one of defoamer BYK-067A, defoamer BYK-088, and defoamer BYK-057.

[0010] Preferably, the photoinitiator is at least one of benzoin ethyl ether, benzoin, and benzoin isopropyl ether.

[0011] Preferably, the other monomer is at least one of N-vinyloxazolidinone, 2-methyl-N-[2-(2-oxo-1-imidazolidinyl)ethyl]-2-acrylamide, and 3-(1,1-difluoro-2-propene-1-yl)-2(1H)-quinoxalinone.

[0012] Preferably, the aliphatic conjugated diene monomer is at least one of 2-methyl-1,3-butadiene, 1,3-butadiene and 2,3-dimethyl-1,3-butadiene.

[0013] Preferably, the particle size of the talc is 300-500 mesh.

[0014] Preferably, the diluent is at least one of methyl methacrylate, ethyl methacrylate and butyl acrylate.

[0015] Preferably, the ethylene acrylic acid elastomer is DuPont™ Vamac® G ethylene acrylic acid elastomer.

[0016] Preferably, there is no special requirement for the source of the amino-terminated hyperbranched polysiloxane. In one embodiment of the present invention, the amino-terminated hyperbranched polysiloxane is prepared according to the method of amino-terminated hyperbranched polysiloxane HPSi-NH2 in Example 1 of the Chinese invention patent with authorization publication number CN110156948B.

[0017] Another object of the present invention is to provide a method for preparing the low-VOC easy-to-pull adhesive tape, comprising the following steps: uniformly mixing the raw material components of the easy-to-pull adhesive layer to obtain an easy-to-pull adhesive liquid; applying the easy-to-pull adhesive liquid on a first release layer to form an easy-to-pull adhesive layer, and then covering the easy-to-pull adhesive layer with a second release layer to obtain a low-VOC easy-to-pull adhesive tape.

[0018] Due to the application of the above technical solution, the present invention has the following beneficial effects:

[0019] (1) The method for preparing the low-VOC easy-to-pull adhesive tape disclosed in the present invention has simple process, convenient operation, low dependence on equipment, high preparation efficiency and finished product qualification rate, is suitable for continuous industrial production, and has high promotion and application value.

[0020] (2) The low VOC easy-to-pull adhesive tape disclosed in the present invention comprises the following raw material components in parts by weight: 3-6 parts of amino-terminated hyperbranched polysiloxane, 1-3 parts of 1,3-bis(oxiranylmethyl)-5-(2-propylene)-1,3,5-triazine-2,4,6(1H,3H,5H)-trione, 30-40 parts of ethylene acrylic elastomer, 10-20 parts of diluent, 2-5 parts of talc, 1-3 parts of aliphatic conjugated diene monomer, 1-2 parts of vinyl trimethoxysilane, 3-5 parts of other monomers, 0.5-1 parts of photoinitiator, and 0.8-1.2 parts of defoaming agent. Through the mutual coordination and joint action of the raw material components, the produced adhesive tape has sufficient tensile performance, high bonding strength, no adhesive residue after being pulled out, and good environmental performance.

[0021] (3) The low-VOC easy-to-pull adhesive tape disclosed in the present invention does not use volatile organic solvents as dispersion media, making the product low in VOC and more environmentally friendly. The addition of amino-terminated hyperbranched polysiloxane and talcum powder not only plays a reinforcing role, but also helps to promote the slippage between the adhesive layer and the molecules of the adhered material when the tape is stretched from the side, making the tape easier to remove without residual adhesive. The other monomers are at least one of N-vinyl oxazolidinone, 2-methyl-N-[2-(2-oxy-1-imidazolidinyl)ethyl]-2-acrylamide, and 3-(1,1-difluoro-2-propylene-1-yl)-2(1H)-quinoxalinone; through interaction with other components, hyperbranched polysiloxane, triazone, acrylic elastomer, trimethoxysilane, oxazolidinone, imidazolealkylamide, and quinoxalinone structures are simultaneously introduced into the molecular structure of the easy-to-pull adhesive. Under the multiple effects of electronic effect, steric effect, and conjugation effect, these structures can give the product excellent mechanical properties, bonding properties, and durability.

[0022] (4) In the low-VOC easy-to-pull adhesive tape disclosed in the present invention, the component containing unsaturated olefinic bonds will undergo photocuring under the action of a photoinitiator, and the component containing amino groups will undergo an epoxy ring-opening reaction with the component containing epoxy groups, thereby forming an interpenetrating network structure, which effectively improves the mechanical properties, bonding properties and performance stability of the product. DETAILED DESCRIPTION

[0023] The following description is used to disclose the present invention so that those skilled in the art can implement the present invention. The preferred embodiments described below are only examples, and those skilled in the art may think of other obvious variations. Example 1

[0024] A low-VOC easy-to-pull adhesive tape comprises a first release layer, an easy-to-pull adhesive layer and a second release layer; the easy-to-pull adhesive layer comprises the following raw material components in parts by weight: 3 parts of amino-terminated hyperbranched polysiloxane, 1 part of 1,3-bis(oxiranylmethyl)-5-(2-propenyl)-1,3,5-triazine-2,4,6(1H,3H,5H)-trione, 30 parts of ethylene acrylic elastomer, 10 parts of diluent, 2 parts of talc, 1 part of aliphatic conjugated diene monomer, 1 part of vinyl trimethoxysilane, 3 parts of other monomers, 0.5 parts of photoinitiator and 0.8 parts of defoaming agent.

[0025] The thickness of the first release layer is 50 μm, the thickness of the easy-to-pull adhesive layer is 100 μm, and the thickness of the second release layer is 50 μm.

[0026] The preparation materials of the first release layer and the second release layer are independent of each other and are PET release films; the defoamer is defoamer BYK-067A; the photoinitiator is benzoin ethyl ether; the other monomers are N-vinyl oxazolidinone; the aliphatic conjugated diene monomer is 2-methyl-1,3-butadiene; the particle size of the talc is 300 mesh; the diluent is methyl methacrylate; and the ethylene acrylic elastomer is DuPont™ Vamac® G ethylene acrylic elastomer.

[0027] The amino-terminated hyperbranched polysiloxane is prepared according to the method of amino-terminated hyperbranched polysiloxane HPSi-NH2 in Example 1 of the Chinese invention patent with the authorization publication number CN110156948B.

[0028] A preparation method of the low-VOC easy-to-pull adhesive tape comprises the following steps: uniformly mixing the raw material components of the easy-to-pull adhesive layer to obtain an easy-to-pull adhesive liquid; applying the easy-to-pull adhesive liquid on a first release layer to form an easy-to-pull adhesive layer, and then covering the easy-to-pull adhesive layer with a second release layer to obtain a low-VOC easy-to-pull adhesive tape. Example 2

[0029] A low-VOC easy-to-pull adhesive tape comprises a first release layer, an easy-to-pull adhesive layer and a second release layer; the easy-to-pull adhesive layer comprises the following raw material components in parts by weight: 4 parts of amino-terminated hyperbranched polysiloxane, 1.5 parts of 1,3-bis(oxiranylmethyl)-5-(2-propenyl)-1,3,5-triazine-2,4,6(1H,3H,5H)-trione, 33 parts of ethylene acrylic elastomer, 12 parts of diluent, 3 parts of talc, 1.5 parts of aliphatic conjugated diene monomers, 1.2 parts of vinyl trimethoxysilane, 3.5 parts of other monomers, 0.6 parts of photoinitiator and 0.9 parts of defoaming agent.

[0030] The thickness of the first release layer is 50 μm, the thickness of the easy-to-pull adhesive layer is 100 μm, and the thickness of the second release layer is 50 μm; the preparation materials of the first release layer and the second release layer are independent CPP films; the defoaming agent is defoaming agent BYK-088; the photoinitiator is benzoin; the other monomers are 2-methyl-N-[2-(2-oxy-1-imidazolidinyl)ethyl]-2-acrylamide; the aliphatic conjugated diene monomer is 1,3-butadiene; and the particle size of the talc is 350 mesh.

[0031] The diluent is ethyl methacrylate; the ethylene acrylic elastomer is DuPont™ Vamac® G ethylene acrylic elastomer; the amino-terminated hyperbranched polysiloxane is prepared according to the method of amino-terminated hyperbranched polysiloxane HPSi-NH2 in Example 1 of the Chinese invention patent with authorization publication number CN110156948B.

[0032] A preparation method of the low-VOC easy-to-pull adhesive tape comprises the following steps: uniformly mixing the raw material components of the easy-to-pull adhesive layer to obtain an easy-to-pull adhesive liquid; applying the easy-to-pull adhesive liquid on a first release layer to form an easy-to-pull adhesive layer, and then covering the easy-to-pull adhesive layer with a second release layer to obtain a low-VOC easy-to-pull adhesive tape. Example 3

[0033] A low-VOC easy-to-pull adhesive tape comprises a first release layer, an easy-to-pull adhesive layer and a second release layer; the easy-to-pull adhesive layer comprises the following raw material components in parts by weight: 4.5 parts of amino-terminated hyperbranched polysiloxane, 2 parts of 1,3-bis(oxiranylmethyl)-5-(2-propenyl)-1,3,5-triazine-2,4,6(1H,3H,5H)-trione, 35 parts of ethylene acrylic elastomer, 15 parts of diluent, 3.5 parts of talc, 2 parts of aliphatic conjugated diene monomers, 1.5 parts of vinyl trimethoxysilane, 4 parts of other monomers, 0.7 parts of photoinitiator and 1 part of defoaming agent.

[0034] The thickness of the first release layer is 50 μm, the thickness of the easy-to-pull adhesive layer is 100 μm, and the thickness of the second release layer is 50 μm; the preparation materials of the first release layer and the second release layer are independent of each other and are OPP films; the defoaming agent is defoaming agent BYK-057; and the photoinitiator is benzoin isopropyl ether.

[0035] The other monomer is 3-(1,1-difluoro-2-propylene-1-yl)-2(1H)-quinoxalinone; the aliphatic conjugated diene monomer is 2,3-dimethyl-1,3-butadiene; the particle size of the talc is 400 mesh; the diluent is butyl acrylate; the ethylene acrylic acid elastomer is DuPont™ Vamac® G ethylene acrylic acid elastomer; the amino-terminated hyperbranched polysiloxane is prepared according to the method of amino-terminated hyperbranched polysiloxane HPSi-NH2 in Example 1 of the Chinese invention patent with authorization publication number CN110156948B.

[0036] A preparation method of the low-VOC easy-to-pull adhesive tape comprises the following steps: uniformly mixing the raw material components of the easy-to-pull adhesive layer to obtain an easy-to-pull adhesive liquid; applying the easy-to-pull adhesive liquid on a first release layer to form an easy-to-pull adhesive layer, and then covering the easy-to-pull adhesive layer with a second release layer to obtain a low-VOC easy-to-pull adhesive tape. Example 4

[0037] A low-VOC easy-to-pull adhesive tape comprises a first release layer, an easy-to-pull adhesive layer and a second release layer; the easy-to-pull adhesive layer comprises the following raw material components in parts by weight: 5.5 parts of amino-terminated hyperbranched polysiloxane, 2.5 parts of 1,3-bis(oxiranylmethyl)-5-(2-propenyl)-1,3,5-triazine-2,4,6(1H,3H,5H)-trione, 38 parts of ethylene acrylic elastomer, 18 parts of diluent, 4.5 parts of talc, 2.5 parts of aliphatic conjugated diene monomers, 1.8 parts of vinyl trimethoxysilane, 4.5 parts of other monomers, 0.9 parts of photoinitiator and 1.1 parts of defoaming agent.

[0038] The thickness of the first release layer is 50 μm, the thickness of the easy-to-pull adhesive layer is 100 μm, and the thickness of the second release layer is 50 μm; the preparation materials of the first release layer and the second release layer are independent BOPP films; the defoamer is a mixture of defoamer BYK-067A, defoamer BYK-088, and defoamer BYK-057 in a mass ratio of 1:2:3; the photoinitiator is a mixture of benzoin ethyl ether, benzoin, and benzoin isopropyl ether in a mass ratio of 2:1:3 The other monomers are a mixture formed by mixing N-vinyl oxazolidinone, 2-methyl-N-[2-(2-oxy-1-imidazolidinyl)ethyl]-2-acrylamide, and 3-(1,1-difluoro-2-propene-1-yl)-2(1H)-quinoxalinone in a mass ratio of 1:1:3; the aliphatic conjugated diene monomer is a mixture formed by mixing 2-methyl-1,3-butadiene, 1,3-butadiene, and 2,3-dimethyl-1,3-butadiene in a mass ratio of 2:3:5.

[0039] The particle size of the talc is 450 mesh; the diluent is a mixture of methyl methacrylate, ethyl methacrylate and butyl acrylate in a mass ratio of 1:3:5; the ethylene acrylic acid elastomer is DuPont™ Vamac®G ethylene acrylic acid elastomer; the amino-terminated hyperbranched polysiloxane is prepared according to the method of amino-terminated hyperbranched polysiloxane HPSi-NH2 in Example 1 of the Chinese invention patent with authorization publication number CN110156948B.

[0040] A preparation method of the low-VOC easy-to-pull adhesive tape comprises the following steps: uniformly mixing the raw material components of the easy-to-pull adhesive layer to obtain an easy-to-pull adhesive liquid; applying the easy-to-pull adhesive liquid on a first release layer to form an easy-to-pull adhesive layer, and then covering the easy-to-pull adhesive layer with a second release layer to obtain a low-VOC easy-to-pull adhesive tape. Example 5

[0041] A low-VOC easy-to-pull adhesive tape comprises a first release layer, an easy-to-pull adhesive layer and a second release layer; the easy-to-pull adhesive layer comprises the following raw material components in parts by weight: 6 parts of amino-terminated hyperbranched polysiloxane, 3 parts of 1,3-bis(oxiranylmethyl)-5-(2-propenyl)-1,3,5-triazine-2,4,6(1H,3H,5H)-trione, 40 parts of ethylene acrylic elastomer, 20 parts of diluent, 5 parts of talc, 3 parts of aliphatic conjugated diene monomers, 2 parts of vinyl trimethoxysilane, 5 parts of other monomers, 1 part of photoinitiator, and 1.2 parts of defoaming agent.

[0042] The thickness of the first release layer is 50 μm, the thickness of the easy-to-pull adhesive layer is 100 μm, and the thickness of the second release layer is 50 μm; the preparation materials of the first release layer and the second release layer are independent release papers; the defoaming agent is defoaming agent BYK-067A; the photoinitiator is benzoin; the other monomers are 2-methyl-N-[2-(2-oxy-1-imidazolidinyl)ethyl]-2-acrylamide; and the aliphatic conjugated diene monomer is 1,3-butadiene.

[0043] The particle size of the talc powder is 500 mesh; the diluent is methyl methacrylate; the ethylene acrylic elastomer is DuPont™ Vamac® G ethylene acrylic elastomer; the amino-terminated hyperbranched polysiloxane is prepared according to the method of amino-terminated hyperbranched polysiloxane HPSi-NH2 in Example 1 of the Chinese invention patent with authorization publication number CN110156948B.

[0044] A preparation method of the low-VOC easy-to-pull adhesive tape comprises the following steps: uniformly mixing the raw material components of the easy-to-pull adhesive layer to obtain an easy-to-pull adhesive liquid; applying the easy-to-pull adhesive liquid on a first release layer to form an easy-to-pull adhesive layer, and then covering the easy-to-pull adhesive layer with a second release layer to obtain a low-VOC easy-to-pull adhesive tape.

[0045] Comparative Example 1

[0046] A low-VOC easy-to-pull adhesive tape and a preparation method thereof, which are substantially the same as those in Example 1, except that no other monomers are added.

[0047] Comparative Example 2

[0048] A low-VOC easy-to-pull adhesive tape and a preparation method thereof, which are substantially the same as those in Example 1, except that no aliphatic conjugated diene monomer and amino-terminated hyperbranched polysiloxane are added.

[0049] In order to further illustrate the beneficial technical effects of the low-VOC easy-pull tapes of each embodiment of the present invention, relevant performance tests were performed on the low-VOC easy-pull tapes prepared in Examples 1-5 and Comparative Examples 1-2. The test results are shown in Table 1. The test method is as follows: the low-VOC easy-pull tapes of Examples 1 to 5 and Comparative Examples 1 to 2 were cured by ultraviolet radiation, the ultraviolet radiation intensity was 1400 mW / cm, and the irradiation curing time was 15 seconds. Then, a 180-degree peel strength test was performed on a SUS steel plate according to GB / T2792-2014, and the tensile strength of the tape was tested using a tensile testing machine at 23±2°C. After curing, the test strip width was 15 mm, the clamp spacing was 20 mm, and the stretching speed was 300 mm / min; a vacuum oven was used to test the residual adhesive of the tape on the stainless steel plate (100 degrees Celsius, 3 minutes).

[0050] Table 1

[0051]

[0052] It can be seen from Table 1 that the low-VOC easy-to-pull adhesive tapes disclosed in the embodiments of the present invention have higher tensile properties and peel strength than the comparative method, and no residual adhesive; the addition of other monomers, aliphatic conjugated diene monomers and amino-terminated hyperbranched polysiloxane is beneficial to improving the above properties.

[0053] The above shows and describes the basic principles, main features and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The above embodiments and descriptions only describe the principles of the present invention. The present invention may be subject to various changes and improvements without departing from the spirit and scope of the present invention. These changes and improvements fall within the scope of the present invention. The scope of protection claimed by the present invention is defined by the attached claims and their equivalents.

Claims

1. A low-VOC easy-pull adhesive tape, characterized in that: The invention comprises a first release layer, an easy-to-pull adhesive layer and a second release layer; the easy-to-pull adhesive layer comprises the following raw material components in parts by weight: 3-6 parts of amino-terminated hyperbranched polysiloxane, 1-3 parts of 1,3-bis(oxiranylmethyl)-5-(2-propylene)-1,3,5-triazine-2,4,6(1H,3H,5H)-trione, 30-40 parts of ethylene acrylic elastomer, 10-20 parts of diluent, 2-5 parts of talc, 1-3 parts of aliphatic conjugated diene monomer, 1-2 parts of vinyl trimethoxysilane, 3-5 parts of other monomers, and 0.5-1 part of photoinitiator. parts, and 0.8-1.2 parts of defoaming agent; the other monomers are at least one of N-vinyl oxazolidinone, 2-methyl-N-[2-(2-oxy-1-imidazolidinyl)ethyl]-2-acrylamide, and 3-(1,1-difluoro-2-propylene-1-yl)-2(1H)-quinoxalinone; the aliphatic conjugated diene monomer is at least one of 2-methyl-1,3-butadiene, 1,3-butadiene, and 2,3-dimethyl-1,3-butadiene; the diluent is at least one of methyl methacrylate, ethyl methacrylate, and butyl acrylate.

2. The low VOC easy-to-pull adhesive tape according to claim 1, characterized in that: The thickness of the first release layer is 20-100 μm, the thickness of the easy-to-pull adhesive layer is 100-150 μm, and the thickness of the second release layer is 20-100 μm.

3. The low VOC easy-to-pull adhesive tape according to claim 1, characterized in that: The preparation materials of the first release layer and the second release layer are independently any one of PET release film, CPP film, OPP film, BOPP film and release paper.

4. The low VOC easy-to-pull adhesive tape according to claim 1, characterized in that: The defoamer is at least one of defoamer BYK-067A, defoamer BYK-088 and defoamer BYK-057.

5. The low VOC easy-to-pull adhesive tape according to claim 1, characterized in that: The photoinitiator is at least one of benzoin ethyl ether, benzoin, and benzoin isopropyl ether.

6. The low VOC easy-to-pull adhesive tape according to claim 1, characterized in that: The particle size of the talcum powder is 300-500 meshes.

7. The low VOC easy-to-pull adhesive tape according to claim 1, characterized in that: The ethylene acrylic acid elastomer is DuPont™ Vamac® G ethylene acrylic acid elastomer.

8. A method for preparing the low-VOC easy-pull adhesive tape according to any one of claims 1 to 7, characterized in that: The method comprises the following steps: uniformly mixing the raw material components of the easy-to-pull adhesive layer to obtain an easy-to-pull adhesive liquid; applying the easy-to-pull adhesive liquid on a first release layer to form an easy-to-pull adhesive layer, and then covering the easy-to-pull adhesive layer with a second release layer to obtain a low-VOC easy-to-pull adhesive tape.

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