TWI792228B - Pressure sensitive tape - Google Patents

Abstract

A pressure sensitive tape includes a base material and a water-based pressure sensitive adhesive on the base material. The water-based pressure sensitive adhesive includes 20 parts by weight to 30 parts by weight of a natural rubber, 18 parts by weight to 28 parts by weight of a synthetic rubber, and 50 parts by weight to 60 parts by weight of a tackifier, in which a particle size (D90) of the tackifier is between 100 nm to 500 nm.

Description

pressure sensitive tape

The present disclosure relates to pressure sensitive tapes, and in particular to pressure sensitive tapes with water sensitive pressure adhesives.

By adjusting the pressure-sensitive adhesive composition of the pressure-sensitive tape, the pressure-sensitive tape has different adhesive characteristics, so that it can be used in various industries, such as textiles, electronics, and automobiles. However, the production process of pressure-sensitive adhesives often uses a large amount of volatile organic solvents, causing environmental pollution and human harm. Therefore, how to provide a pressure-sensitive adhesive that does not require organic solvents and has high adhesiveness is an important issue.

The disclosure provides a pressure-sensitive adhesive tape, which includes a water-sensitive pressure adhesive, so that the pressure-sensitive adhesive tape has good adhesion.

According to some embodiments of the present disclosure, the pressure-sensitive adhesive tape includes a base material and a water-sensitive pressure-sensitive adhesive on the base material. The water-sensitive pressure adhesive includes 20 to 30 parts by weight of natural rubber, 18 to 28 parts by weight of synthetic rubber and 50 to 60 parts by weight of a tackifier, wherein the particle size (D90) of the tackifier is between Between 100nm and 500nm.

In some embodiments, the tackifier is prepared by including the following reagents: 45 to 50 parts by weight of deionized water, 45 to 50 parts by weight of petroleum resin, 0.5 to 6 parts by weight A surfactant and a stabilizer of 0.5 to 2 parts by weight.

In some embodiments, the particle size (D90) of the petroleum-based resin is between 700 nm and 1000 nm.

In some embodiments, the hydrophilic-lipophilic balance of the surfactant is between 20 and 40.

In some embodiments, the surfactant is an ionic surfactant including sodium lauryl sulfate.

In some embodiments, the surfactant includes an ionic surfactant and a nonionic surfactant, and the weight ratio of the ionic surfactant to the nonionic surfactant is between 0.25 and 1.6.

In some embodiments, the nonionic surfactant includes polyoxyethylene.

In some embodiments, the stabilizer includes polyvinylpyrrolidone.

In some embodiments, the solid content of the water-sensitive pressure adhesive is between 50 wt % and 60 wt %.

In some embodiments, the pH value of the water-sensitive pressure adhesive is between 9 and 11.

According to the above-mentioned embodiments of the present disclosure, since the water-sensitive pressure adhesive of the pressure-sensitive tape includes a tackifier with a low particle size and uniform particle size, the water-sensitive pressure adhesive has high stability and can provide good adhesion of the pressure-sensitive tape. On the other hand, the water-sensitive pressure-sensitive adhesive is a non-organic solvent-based pressure-sensitive adhesive, thereby avoiding the use of organic solvents in the production process of the pressure-sensitive tape, thereby reducing the harm to the environment or the human body.

The following disclosure presents a number of different embodiments or examples in order to achieve the different features of the mentioned subject matter. Specific examples of numerical values, operations, materials, etc. are described below to simplify the present disclosure. Of course, these are examples only, not limiting.

The disclosure provides a pressure-sensitive adhesive tape, which includes a base material and a water-sensitive pressure adhesive on the base material, and the water-sensitive pressure adhesive includes a tackifier. Since the tackifier has a low and uniform particle size, the water-sensitive pressure adhesive can have high stability and provide good adhesion of the pressure-sensitive tape.

The pressure-sensitive adhesive tape disclosed in the present disclosure includes a substrate and a water-sensitive pressure adhesive on the substrate, wherein the water-sensitive pressure adhesive includes 20 to 30 parts by weight of natural rubber, 18 to 28 parts by weight of synthetic rubber, and 50 parts by weight Parts to 60 parts by weight of the tackifier. Specifically, the particle size (D90) of the tackifier in the water-sensitive pressure adhesive is between 100 nm and 500 nm. Since the tackifier in the water-sensitive pressure adhesive has a uniform low particle size, the tackifier can penetrate into the pores between the rubber molecules or between the rubber molecules and the substrate, thereby increasing the mutual solubility effect between the components of the water-sensitive pressure adhesive. Therefore, the tackifier can increase the stability of the water-sensitive pressure adhesive and increase the adhesiveness of the pressure-sensitive adhesive tape.

In some embodiments, the base material of the pressure-sensitive tape may include a smooth and soft material, so as to provide a good adhesion effect of the pressure-sensitive tape. For example, the substrate can be a polyvinyl chloride film, so that the pressure-sensitive tape can conform to the surface of the substrate when it is adhered to the substrate, and increase the adhesion area between the two.

In some embodiments, the solid content of the water-sensitive pressure adhesive can be between 50 wt % and 60 wt %, so as to provide a suitable viscosity of the water-sensitive pressure adhesive and good adhesion of the pressure-sensitive adhesive tape. For example, the viscosity of the water-sensitive adhesive can range from 400cP to 800cP. When the viscosity of the water-sensitive pressure adhesive is within this range, it has suitable fluidity, so that the water-sensitive pressure adhesive can be coated on the substrate to form a uniform adhesive surface, while maintaining the good adhesion of the pressure-sensitive adhesive tape. Specifically, if the viscosity of the water-sensitive pressure adhesive is less than 400cP, the water-sensitive pressure adhesive may be too thin to provide the adhesiveness of the pressure-sensitive tape; and if the viscosity of the water-sensitive pressure adhesive is greater than 800cP, it is easy to increase the difficulty of coating , which is not conducive to the coating process. In some embodiments, the pH value of the water-sensitive pressure adhesive can be between 9 and 11, so as to avoid the accumulation of tackifiers in the water-sensitive pressure adhesive. In other words, when the pH value of the water-sensitive pressure adhesive is within this range, the tackifier can maintain a low particle size state, thereby increasing the stability of the water-sensitive pressure adhesive.

In some embodiments, the tackifier can be prepared by including the following reagents: 45 to 50 parts by weight of deionized water, 45 to 50 parts by weight of petroleum resin, 0.5 to 6 parts by weight A surfactant and a stabilizer of 0.5 to 2 parts by weight. In some embodiments, the reagents for forming the tackifier may include petroleum-based resin and deionized water in the same weight portion. Since the reagents used to make the tackifier include a high proportion of deionized water, the tackifier formed has a high water content, thereby increasing the diffusion ability of the water-sensitive pressure adhesive to the substrate and providing good adhesion of the pressure-sensitive tape . On the other hand, the reagents used to make tackifiers use water as the main solvent and include small amounts of surfactants and stabilizers, thereby avoiding the addition of organic solvents or large amounts of additives.

In some embodiments, the preparation method of the tackifier may include a direct emulsification process of deionized water, petroleum resin and surfactant. Specifically, the direct emulsification process can use deionized water as the main solvent, and use a surfactant to complete the emulsification process of deionized water and petroleum resin, thereby avoiding the addition of additional organic solvents or dispersants. For example, deionized water, petroleum resin and surfactant can be added to a high-speed homogenizer, and homogenized at a speed of 6000rpm to 7000rpm for 10 minutes to 30 minutes to emulsify and form an emulsion mainly composed of petroleum resin. In some embodiments, the preparation method of the tackifier may include adding a stabilizer to the emulsion obtained by the direct emulsification process, so that the mutual solubility between the tackifier components is increased. Therefore, the tackifier has high stability, thereby increasing the stability of the water-sensitive pressure adhesive. In some embodiments, the stabilizer can include polyvinylpyrrolidone.

In some embodiments, the petroleum-based resin (such as C5 petroleum resin or C9 petroleum resin, etc.) may have a low particle size, so that the petroleum-based resin can be directly emulsified into a tackifier. Specifically, the particle size (D90) of the petroleum-based resin may be between 700 nm and 1000 nm, so that the particle size of the petroleum-based resin is small enough to form a tackifier through a direct emulsification process. On the other hand, due to the uniform low particle size of the petroleum-based resin, the tackifier made of it also has a uniform low particle size, which can increase the stability of the tackifier and provide good adhesion of the pressure-sensitive tape .

In some embodiments, the preparation of the petroleum-based resin may include subjecting the petroleum-based resin masterbatch to a wet grinding process to form the petroleum-based resin. Specifically, the petroleum-based resin masterbatch can be subjected to a wet grinding process in an aqueous solution to form a petroleum-based resin, wherein water can be used as a lubricant or reduce the process temperature, thereby avoiding the addition of organic solvents. For example, the preparation method of petroleum-based resin may include mixing 50 to 90 parts by weight of water and 5 to 30 parts by weight of petroleum-based resin masterbatch, and grinding 10 with a planetary ball mill at a speed of 1000 to 3000 rpm. hours to 14 hours, and dry the ground mixture to obtain a petroleum-based resin. If the grinding time is less than 10 hours, the petroleum-based resin masterbatch may not be subjected to the force time enough to form a petroleum-based resin with a low particle size; and if the grinding time is longer than 14 hours, it may cause the petroleum-based resin to agglomerate and form a petroleum-based resin with a high particle size. particle size petroleum resin.

In some embodiments, the surfactant can have a suitable Hydrophile-Lipophile Balance (HLB) value, so that the tackifier made by it has a uniform low particle size, thereby increasing the stability of the tackifier and provide good adhesion to pressure sensitive tapes. In some embodiments, the hydrophilic-lipophilic balance of the surfactant may be between 20 and 40. In a preferred embodiment, the hydrophilic-lipophilic balance value of the surfactant may be 30. Specifically, if the hydrophilic-lipophilic balance value of the surfactant is less than 20, the formed tackifier may have a high particle size and uneven particle size, thereby reducing the adhesiveness of the pressure-sensitive adhesive tape; If the hydrophilic-lipophilic balance value is greater than 40, the formed tackifier may be easily separated into two phases, thereby reducing the stability of the tackifier.

In some embodiments, the surfactant may be an ionic surfactant so as to provide a suitable hydrophilic-lipophilic balance. For example, the ionic surfactant may include sodium dodecyl sulfate (sodium dodecyl sulfate, SDS), and when sodium dodecyl sulfate is used as the surfactant, its hydrophilic-lipophilic balance value is, for example, 40. In some embodiments, the surfactant may include an ionic surfactant and a nonionic surfactant, wherein the weight ratio of the ionic surfactant to the nonionic surfactant may be between 0.25 and 1.6, thereby providing Suitable hydrophilic-lipophilic balance value. For example, the ionic surfactant can include sodium lauryl sulfate, and the nonionic surfactant can include polyoxyethylene. More specifically, when using sodium lauryl sulfate and polyoxyethylene in a weight ratio of 0.25 as the surfactant, its hydrophilic-lipophilic balance value is, for example, 20; and when using dodecyl sulfate in a weight ratio of 1.6 When sodium sulfate and polyoxyethylene are used as surfactants, their hydrophilic-lipophilic balance value is, for example, 30.

Water-sensitive pressure adhesives made of tackifiers with low particle size can provide good adhesion of pressure-sensitive tapes. In some embodiments, the adhesiveness of the pressure-sensitive tape can be manifested in its various properties, such as peel adhesion, shear adhesion, tack or cohesion. In some embodiments, the peel strength of the pressure-sensitive tape can be between 150 gf/19 mm and 300 gf/19 mm, so as to provide high adhesive force of the pressure-sensitive tape. In some embodiments, the shear strength of the pressure-sensitive adhesive tape can be between 120 gf/19 mm and 360 gf/19 mm, so as to reduce the slippage between the pressure-sensitive adhesive tape and the substrate. In some embodiments, the quick tack test result of the pressure-sensitive tape can be between 0.1 cm and 4 cm, so that the pressure-sensitive tape has good adhesion in the initial stage of adhesion. In some embodiments, the cohesion test result of the pressure-sensitive adhesive tape can range from 10 minutes to 35 minutes, so as to reduce internal damage when the pressure-sensitive adhesive tape is adhered.

According to the above-mentioned embodiments of the present disclosure, the pressure-sensitive adhesive tape includes a water-sensitive pressure adhesive forming its adhesive surface. Since the water-sensitive pressure adhesive includes a tackifier with a low particle size and uniform particle size, the water-sensitive pressure adhesive has high stability and provides good adhesion of the pressure-sensitive adhesive tape. On the other hand, the tackifier of the water-sensitive pressure adhesive can be prepared by a direct emulsification process using water as a solvent, thereby avoiding the use of organic solvents in the production process of the pressure-sensitive adhesive tape, thus reducing the harm to the environment or human body.

In the following description, various measurements and evaluations will be performed on the pressure-sensitive adhesive tape made of the tackifier and the water-sensitive pressure adhesive of the present disclosure. The features of the present disclosure will be described in more detail below with reference to Experimental Example 1 to Experimental Example 4. Although the following examples are described, materials used, their amounts and ratios, processing details, processing flow, and the like can be appropriately changed without departing from the scope of the present disclosure. Therefore, the present disclosure should not be limitedly interpreted by the embodiments described below. ＜Experimental example 1: Basic formula evaluation of tackifier＞

In this experimental example, the particle size of the tackifier of each embodiment was measured, and a stability test was performed on it. Specifically, in the stability test, a high-speed centrifuge was used to centrifuge the tackifiers of each example at a speed of 3000 rpm for 30 minutes, and the separation of the tackifiers was observed visually to evaluate the stability. The composition, content and measurement results of the tackifier in each embodiment are shown in Table 1.

Table I Petroleum resin Surfactant stabilizer Deionized water Particle size (nm) Particle size standard deviation (nm) stability Example 1 46.23 5.68 (A) 1.85 46.23 461.55 86.67 not separated Example 2 46.23 5.69 (B) 1.85 46.23 433.84 12.70 not separated Example 3 48.66 0.73 (C) 1.95 48.66 448.52 24.02 not separated Example 4 49.14 0.74 (C) 0.98 49.14 460.23 40.33 not separated Note 1: Unmarked units are parts by weight, and stability does not have a unit Note 2: The particle size (D90) of petroleum-based resins is 750nm Note 3: (A) represents the HLB value of 20; (B) represents the HLB value is 30; (C) means the HLB value is 40

It can be seen from Table 1 that the particle diameters of the tackifiers in each example are all between 100 nm and 500 nm, and the tackifier in Example 2 has the smallest standard deviation of particle diameters. Therefore, the tackifiers in each example have a low particle size, and the tackifier in Example 2 has a relatively uniform particle size. In addition, the tackifiers of each example did not separate after the stability test, showing that each tackifier has good stability to maintain its low particle size state. ＜Experimental example 2: Evaluation of storage stability of thickener＞

In this experimental example, high-temperature, normal-temperature and low-temperature storage stability tests were carried out for the tackifiers of each embodiment in Experimental Example 1. Specifically, in the high-temperature storage stability test, the tackifier was placed in an oven at a temperature of 48°C for 48 hours, and the separation of the tackifier was observed with the naked eye after it returned to room temperature. The storage stability test at room temperature is to place the tackifier at room temperature for 7 days, and observe the separation of the tackifier with the naked eye. The low-temperature storage stability test is to place the tackifier in a freezer at a temperature of -5°C to -15°C for 24 hours, and observe the separation of the tackifier with the naked eye after it returns to room temperature. The results show that the tackifiers of each example did not produce obvious separation phenomenon in the high temperature, normal temperature and low temperature tests, so each tackifier has good storage stability. ＜Experimental example 3: Basic formula evaluation of water-sensitive pressure adhesive＞

In this experimental example, the solid content and viscosity were measured for the water-sensitive pressure adhesive of each embodiment. Specifically, the tackifier and other components of Example 2 in Experimental Example 1 were configured into the water-sensitive pressure adhesives of each embodiment of this experimental example, and the solid content and viscosity of each water-sensitive pressure adhesive were measured. The composition, content and measurement results of the water-sensitive pressure glue of each embodiment are shown in Table 2.

Table II natural rubber synthetic rubber Tackifier Solid content (%) Viscosity (cP) Example 5 26.64 23.07 51.28 56.02 450 Example 6 23.07 25.64 51.28 57.02 400 Example 7 27.27 18.18 54.55 57.10 400 Example 8 22.72 22.72 54.55 57.02 500 Note 1: Unmarked units are parts by weight

It can be known from Table 2 that the solid content of the water-sensitive pressure adhesives in each embodiment is between 50wt% and 60wt%, and the viscosity is between 400cP and 800cP. Therefore, the water-sensitive pressure adhesive of each embodiment has suitable solid content and viscosity, so that the water-sensitive pressure adhesive has suitable fluidity to form the adhesive surface of the pressure-sensitive tape and provide the adhesiveness of the pressure-sensitive tape. ＜Experimental example 4: Adhesive evaluation of pressure-sensitive tape＞

In this experimental example, the adhesiveness evaluation was performed about the pressure-sensitive adhesive tape of each Example. Specifically, the water-sensitive pressure adhesives of each embodiment in Experimental Example 3 were made into pressure-sensitive tapes, and the peel strength, shear strength, quick tack and cohesion were evaluated for each pressure-sensitive tape. In detail, the peel strength of each pressure-sensitive tape is the result of testing using the standard method ASTM-D3330; the shear strength is the result of testing using the standard method ASTM-D1000; the quick tack is tested using the standard method PSTC-6 The cohesion is the test result of applying force to the pressure-sensitive tape with a weight of 500g under the conditions of the area of the pressure-sensitive tape is 19mm×25mm and the temperature is 50°C. The test results of the pressure-sensitive adhesive tapes of various embodiments are shown in Table 3.

Table three Peel strength (gf/19mm) Shear strength (gf/19mm) Quick viscosity test (cm) Cohesion test (min) Example 5 152 120 3.5 30 Example 6 186 192 4.0 33 Example 7 246 313 0.6 15 Example 8 271 357 0.3 13

It can be seen from Table 3 that the peel strengths of the pressure-sensitive adhesive tapes of the various examples are all between 150 gf/19mm and 300 gf/19mm, which shows that they have high adhesive force. The shear strength of each pressure-sensitive adhesive tape ranges from 120gf/19mm to 360gf/19mm, showing that it is not easy to slip between the adhesive tape and the substrate. The quick-tack test results of each pressure-sensitive adhesive tape ranged from 0.1 cm to 4 cm, indicating that they had high adhesive force at the initial stage of adhesion. The cohesion test results of each pressure-sensitive adhesive tape ranged from 10 minutes to 35 minutes, showing that internal damage is not likely to occur during adhesion. Therefore, the pressure-sensitive adhesive tapes of each embodiment have good adhesiveness in many aspects.

Through the verification of the above experimental examples, the pressure-sensitive adhesive tape of the present disclosure can have good adhesion in many aspects, and the pressure-sensitive adhesive tape can have suitable fluidity without losing the adhesiveness. In addition, the tackifier of the water-sensitive pressure adhesive has uniform low particle size and good stability, so that the water-sensitive pressure adhesive has high stability and provides good adhesion of the pressure-sensitive adhesive tape.

The foregoing outlines features of some embodiments so that those skilled in the art may better understand the aspects of this disclosure. Those skilled in the art should appreciate that they may readily use the present disclosure as a basis for designing or modifying other processes and structures for carrying out the same purposes and/or achieving the same advantages as the embodiments described herein. Those skilled in the art should also understand that such equivalent constructions do not depart from the spirit and scope of the present disclosure, and that they can make various changes, substitutions and alterations without departing from the spirit and scope of the present disclosure.

none

none

Domestic deposit information (please note in order of depositor, date, and number) none Overseas storage information (please note in order of storage country, institution, date, and number) none

Claims (10)

A pressure-sensitive adhesive tape, comprising: a substrate; and a water-sensitive pressure adhesive on the substrate, wherein the water-sensitive pressure adhesive includes: 20 to 30 parts by weight of natural rubber; 18 to 28 parts by weight of Synthetic rubber; and 50 to 60 parts by weight of a tackifier, wherein the particle size (D90) of the tackifier is between 100nm and 500nm, and the tackifier is obtained by including deionized water and petroleum-based Reagents prepared from resins. The pressure-sensitive adhesive tape according to claim 1, wherein the reagent used to prepare the tackifier includes: 45 to 50 parts by weight of the deionized water; 45 to 50 parts by weight of the Petroleum resin; 0.5 to 6 parts by weight of a surfactant; and 0.5 to 2 parts by weight of a stabilizer. The pressure-sensitive adhesive tape according to claim 2, wherein the particle size (D90) of the petroleum-based resin is between 700nm and 1000nm. The pressure-sensitive adhesive tape according to claim 2, wherein the hydrophilic-lipophilic balance value of the surfactant is between 20 and 40. The pressure-sensitive adhesive tape as described in claim 2, wherein the interface The active agent is an ionic surfactant including sodium lauryl sulfate. The pressure-sensitive adhesive tape as claimed in claim 2, wherein the surfactant includes an ionic surfactant and a nonionic surfactant, and the weight ratio of the ionic surfactant to the nonionic surfactant is Between 0.25 and 1.6. The pressure-sensitive adhesive tape according to claim 6, wherein the nonionic surfactant comprises polyoxyethylene. The pressure-sensitive adhesive tape according to claim 2, wherein the stabilizer includes polyvinylpyrrolidone. The pressure-sensitive adhesive tape according to claim 1, wherein the solid content of the water-sensitive pressure-sensitive adhesive is between 50wt% and 60wt%. The pressure-sensitive adhesive tape according to claim 1, wherein the pH value of the water-sensitive pressure-sensitive adhesive is between 9 and 11.