TWI502227B - Optical antistaric adhesion coating layer, method of preparing an optical antistaric adhesion coating material, and method of fabricating an optical antistaric adhesion coating layer - Google Patents

Description

Optical grade antistatic adhesive coating, optical grade antistatic adhesive coating preparation method and optical grade antistatic adhesive coating manufacturing method

The invention relates to an optical grade coating, and in particular to an optical grade antistatic adhesive coating, a preparation method of an optical grade antistatic adhesive coating and a method for preparing an optical grade antistatic adhesive coating.

FIG. 1 is a schematic view of a known polarizing plate. Referring to FIG. 1 , the polarizing plate 100 is used for manufacturing a liquid crystal display (LCD), which is mainly composed of a protective film 110 and a triacetate cellulose film (TAC Film). 120, a polyvinyl alcohol film (Poly Vinyl Alcohol, PVA) 130, another triacetate film 140, adhesive (Surf Sensitive Adhesives PSA) 150, and a release film 160 and other film layers.

In the polarizing plate 100, the polyvinyl alcohol film 130 is a transparent polymer film material, and the molecules are arranged in a certain direction after being stressed and extended. At this time, the polyvinyl alcohol film 130 is caused to adsorb an iodine complex or a dye, and it is possible to absorb light of a specific polarization characteristic by an iodine complex or a dye to achieve a polarizing effect. Since the polyvinyl alcohol film 130 is inferior in moisture resistance and heat resistance, the cellulose triacetate films 120 and 140 are bonded to the upper and lower sides after the polyvinyl alcohol film 130 is extended. As a result, the cellulose triacetate films 120 and 140 can prevent the shrinkage of the polyvinyl alcohol film 130 in addition to providing proper protection. Further, the outer surfaces of the cellulose triacetate film 120 and the cellulose triacetate film 140 may be bonded to a protective film 110 and a release film 160, respectively.

In detail, during the manufacturing process of the liquid crystal display, the protective film 110 needs to be stripped from the cellulose triacetate film 120. The plurality of film layers in the polarizing plate 100 are composed of a plastic material, and both have high electrical insulation, so that these layers may generate static electricity or electrostatic discharge during rubbing or stripping. When the protective film 110 is peeled off from the cellulose triacetate film 120, an electrostatic discharge phenomenon causes the liquid crystal molecules in the liquid crystal display to lose alignment and cause a display failure. Therefore, it is necessary to increase the antistatic performance in the protective film 110.

In general, the way to suppress the electrostatic discharge is mainly to use a surfactant having a low molecular weight (relative to a polymer having a large molecular weight) to be added to the adhesive or to transfer the surfactant to the adherend. However, this method is liable to cause the staining of the adherend and the residual glue due to the leakage of the low-molecular surfactant to the surface of the adhesive. (Related techniques can be referred to Japanese Patent Publication: JP-A 9-165460)

Further, there has been proposed a protective film in which an antistatic layer is formed on the other side of a plastic film (refer to Taiwan Patent Publication No. TW520448 for related art). This method prevents the electrostatic discharge problem generated on the side of the protective film, but does not protect the object to be protected from electrostatic discharge.

The present invention provides an optical grade antistatic adhesive coating which, due to its excellent antistatic property, prevents the problem of defects caused by electrostatic discharge on the surface of the adhesive body.

The present invention provides an optical grade antistatic adhesive coating that is applied to a substrate. The optical grade antistatic adhesive coating comprises a substrate and an antistatic material. The substrate comprises a polyacrylic polymer material which is cured by a hardener. The antistatic material is distributed inside the matrix composed of the polyacrylic polymer material, wherein the antistatic material and the hardener are compoundable.

In an embodiment of the invention, the substrate comprises a flexible substrate or a rigid substrate.

In an embodiment of the invention, the antistatic material is more distributed on the surface of the substrate composed of the polyacrylic polymer material.

The invention further provides a preparation method of an optical grade antistatic adhesive coating. The steps include preparing a first formulation from an acrylic high-altitude material and a solvent. Moreover, a second formulation is prepared by using a hardener and an antistatic material, wherein the antistatic material and the hardener are compoundable. Next, the first formulation and the second formulation were uniformly mixed to prepare an optical grade antistatic adhesive coating.

In an optical grade antistatic adhesive coating and an optical grade antistatic adhesive coating preparation method according to an embodiment of the invention, the material of the hardener comprises isocyanate.

In an optical grade antistatic adhesive coating and an optical grade antistatic adhesive coating preparation method according to an embodiment of the invention, the polyacrylic acid polymer material comprises a urethane acrylic resin, a polyester acrylic resin, an epoxy acrylic resin, an aliphatic polyurethane. A hexaacrylate oligomer, an aliphatic urethane diacrylate oligomer, or a combination thereof.

In an optical grade antistatic adhesive coating and an optical grade antistatic adhesive coating preparation method according to an embodiment of the invention, the antistatic material comprises polyethylene glycol (PEG), diundecyl amine. , triphenyl phosphorite (triphenyl phosphorite) or a combination of the above.

In an optical grade antistatic adhesive coating and an optical grade antistatic adhesive coating preparation method according to an embodiment of the invention, the antistatic material comprises a cationic group type antistatic material having a solid content of more than 10% by weight.

In the method of producing an optical grade antistatic adhesive coating according to an embodiment of the present invention, the solvent includes a toluene solvent.

The invention further provides a method for fabricating an optical grade antistatic adhesive coating. The steps of the method include preparing an optical grade antistatic adhesive coating in accordance with the aforementioned method of preparing an optical grade antistatic adhesive coating. Next, an optical grade antistatic adhesive coating is applied to a substrate. Subsequently, a curing process is performed to cure the optical grade antistatic adhesive coating on the substrate to an optical grade antistatic adhesive coating.

In the method of fabricating an optical grade antistatic adhesive coating according to an embodiment of the invention, the curing process includes a thermal curing process.

Based on the above, the present invention selects an antistatic material that can be combined with a hardener to produce an optical grade adhesive coating having an antistatic effect. Antistatic materials are distributed inside the optical grade antistatic adhesive coating to improve the antistatic effect of the optical grade antistatic adhesive coating. Therefore, the optical grade antistatic adhesive coating of the invention can be applied to the substrate as a protective sheet of the polarizing plate to provide a desired antistatic effect, and can also serve as an adhesive layer for adhering the two objects to provide an antistatic effect for the two objects.

The above described features and advantages of the present invention will be more apparent from the following description.

In general, a substrate as a protective film needs to be coated with an antistatic coating on its surface. Current antistatic coatings provide an antistatic effect by using an ionically conductive polymer, such as a complex of polyvinyl oxide. Although such molecules can provide electrical conductivity to prevent the occurrence of electrostatic discharge phenomena, this type of molecule only provides electrical conduction on the surface of the antistatic coating, and thus such an antistatic coating is still limited in antistatic ability. In other words, in order to improve the antistatic ability of the antistatic coating, the antistatic coating has room for improvement. To achieve the above objectives, a new optical grade antistatic coating and related preparation processes are presented below to illustrate the spirit of the present invention.

2 is a schematic view of a protective film having antistatic capability according to an embodiment of the invention. Referring to FIG. 2 , the protective film 200 includes, for example, a substrate 210 , an abrasion resistant layer 220 , an optical grade antistatic adhesive coating 230 , a release film 240 , and a plurality of antistatic layers 252 , 254 .

The wear-resistant layer 220 and the optical-grade antistatic adhesive coating 230 are respectively disposed on opposite sides of the substrate 210, wherein the wear-resistant layer 220 can provide scratch-resistant and wear-resistant properties, and thus can also be referred to as an anti-wiping layer and a hard coat layer. Wait. The release film 240 is disposed on a side of the optical grade antistatic adhesive coating 230 away from the substrate 210, wherein the release film 240 may include a release substrate 242 and a release coating 244, and the release film 240 is used temporarily. Covers the optical grade antistatic adhesive coating 230. When the protective film 200 is to be attached to an object to be protected (for example, a display panel), the release film 240 may be peeled off from the optical-grade antistatic adhesive coating 230. Thus, the optical grade antistatic adhesive coating 230 can adhere to the object to be protected. In addition, in order to provide a desired antistatic effect of the protective film 200, additional antistatic layers 252, 254 may be selectively disposed between the wear layer 220 and the substrate 210 and outside the release substrate 242.

However, the present invention is not limited to the protective film 200 of the above structure. In one embodiment, another antistatic layer (not shown) may be disposed between the optical grade antistatic adhesive coating 230 and the substrate 210. Alternatively, the protective film 200 may omit the configuration of the antistatic layers 252, 254. In other words, the structure of the protective film 200 is merely exemplified herein, and is not intended to limit the number of constituent film layers and structures of the protective film 200 of the present invention.

In the present embodiment, the substrate 210 can be a rigid substrate or a flexible substrate. In the case of the flexible substrate, the material of the substrate 210 may be polyethylene terephthalate (PET). Of course, the invention is not limited thereto, and the material of the substrate 210 may be other. Polymer materials or glass.

The optical grade antistatic adhesive coating 230 applied to the substrate 210 includes a substrate 232 and an antistatic material 234. The matrix 232 comprises a polyacrylic polymer material cured by a hardener, and the antistatic material 234 is distributed inside the matrix 232 composed of a polyacrylic polymer material, wherein the antistatic material 234 and the hardener are compoundable. . In addition, the embodiment does not limit the antistatic material 234 in the optical antistatic coating 230 to be distributed inside the substrate 232. In an embodiment, the antistatic material 234 may be more distributed in the polyacrylic polymer material. The surface of the substrate 232. In this embodiment, the antistatic material 234 in the optical grade antistatic adhesive coating 230 is distributed inside the substrate 232 or simultaneously distributed inside and on the substrate 232, so the optical grade antistatic adhesive coating 230 can provide quite good Antistatic effect. In short, the optical grade antistatic adhesive coating 230, in addition to having adhesive properties, provides desirable antistatic properties so that the protective film 200 does protect the components to which it is attached.

In particular, the method of fabricating the optical grade antistatic adhesive coating 230 can include the steps described below. First, a first formulation is prepared with an acrylic high-score material and a solvent. Moreover, the second formulation is prepared with a hardener and an antistatic material, wherein the antistatic material and the hardener are compoundable. Next, the first formulation and the second formulation were uniformly mixed to prepare an optical grade antistatic adhesive coating. The optical grade antistatic adhesive coating is then applied to a substrate (such as substrate 210 depicted in Figure 2). Subsequently, a curing process is performed to cure the optical grade antistatic adhesive coating on the substrate to the optical grade antistatic adhesive coating 230 illustrated in FIG. 2, wherein the curing process includes a thermal curing process or a photocuring process or both Perform photocuring and thermal curing processes. .

Specifically, the polyacrylic polymer material of the present embodiment includes a urethane acrylate resin, a polyester acryl resin, an epoxy acrylate resin, an aliphatic urethane hexaacrylate oligomer, an aliphatic urethane diacrylate oligomer, or the like. combination. The solvent includes a toluene solvent. The material of the hardener includes isocyanate. In addition, the antistatic material includes polyethylene glycol (PEG), diundecyl amine, triphenyl phosphorite or a combination thereof. It is to be noted that the above materials are merely illustrative of the materials that may be used in the present invention and are not intended to limit the materials employed in the present invention. For example, any antistatic material that can be combined with a hardener can be applied to various embodiments of the present invention. In order to be well combined with the hardener, the antistatic material may be a cationic group type antistatic material including a solid content of more than 10% by weight.

Several examples will be given below to illustrate the preparation of the optical grade antistatic adhesive coating of the present invention and the properties of the coating produced by using such a coating.

Example 1. A 50 ml glass bottle can be used by the manufacturer to hold the raw materials. In the present example, for example, 10 g of toluene solvent is first added to a glass bottle. Next, 20 g of an acrylic copolymer adhesive material (for example, model PSA-12, manufactured by Suiyu Industrial Co., Ltd.) was added under high-speed stirring. Then, the mixture in the glass bottle was formulated into a photocurable resin (first formulation) having a solid content of about 50%.

In addition, 1 g of isocyanate (for example, model N3300, manufactured by Bayer) was added to 0.03 g of an ionic antistatic material (for example, model SN, manufactured by Cytec) to obtain a second formulation. Since the antistatic material used in the present invention and the hardener such as isocyanate can be combined with each other and the two components are mutually soluble, the second formulation is a uniformly mixed mixture. Then, after the mixture of the first formulation and the second formulation is stirred at a high speed, about 33.03 g of the optical grade antistatic adhesive coating can be prepared.

Example 2. A 50 ml glass bottle can be used by the manufacturer to hold the raw materials. In the present example, for example, 10 g of toluene solvent is first added to a glass bottle. Next, 20 g of an acrylic copolymer adhesive material (for example, model PSA-14, manufactured by Suiyu Industrial Co., Ltd.) was added under high-speed stirring. Then, the mixture in the glass bottle is formulated into a photocurable resin having a solid content of about 50% (that is, the first formulation).

Further, 1 g of an isocyanate (for example, model N3300, manufactured by Bayer) was added to 0.03 g of an ionic antistatic material (for example, model SN, manufactured by Cytec Co., Ltd.) to obtain a second formulation. Then, after the mixture of the first formulation and the second formulation is stirred at a high speed, about 33.03 g of the optical grade antistatic adhesive coating can be prepared.

Example 3. A 50 ml glass bottle can be used by the manufacturer to hold the raw materials. In the present example, for example, 10 g of toluene solvent is first added to a glass bottle. Next, 20 g of an acrylic copolymer adhesive material (for example, model PSA-12, manufactured by Suiyu Industrial Co., Ltd.) was added under high-speed stirring. Then, the mixture in the glass bottle is formulated into a photocurable resin having a solid content of about 50% (that is, the first formulation).

Further, 1 g of an isocyanate (for example, model N3200, manufactured by Bayer) was added to 0.03 g of an ionic antistatic material (for example, model SN, manufactured by Cytec Co., Ltd.) to obtain a second formulation. Then, after the mixture of the first formulation and the second formulation is stirred at a high speed, about 33.03 g of the optical grade antistatic adhesive coating can be prepared.

Example 4. A 50 ml glass bottle can be used by the manufacturer to hold the material. In the present example, for example, 10 g of toluene solvent is first added to a glass bottle. Next, 20 g of an acrylic copolymer adhesive material (for example, model PSA-14, manufactured by Suiyu Industrial Co., Ltd.) was added under high-speed stirring. Then, the mixture in the glass bottle is formulated into a photocurable resin having a solid content of about 50% (i.e., the first formulation).

Further, 1 g of an isocyanate (for example, model N3200, manufactured by Bayer) was added to 0.03 g of an ionic antistatic material (for example, model SN, manufactured by Cytec Co., Ltd.) to obtain a second formulation. Then, after the mixture of the first formulation and the second formulation is stirred at a high speed, about 33.03 g of the optical grade antistatic adhesive coating can be prepared.

Further, the antistatic adhesive coatings of the above Examples 1 to 4 can be coated on a PET substrate by a coating bar No. 22, and subjected to a thermal curing process to form an optical-grade antistatic adhesive coating on the PET substrate. In detail, the step of the thermal curing process is, for example, drying the optical-grade antistatic adhesive coating on the PET substrate at a temperature of 110 ° C for 6 minutes to cure the coating film. Further, the optical-grade antistatic adhesive coating formed of the adhesive coatings of Examples 1 to 4 was, for example, 10 μm thick. Table 1 shows the characteristics exhibited in each test by coating the PET substrate with Examples 10 to 4 to make an optical grade antistatic adhesive coating of 10 μm thick.

Here, the test methods of each test are as follows:

Transmittance test:

The penetration and haze of the optical grade antistatic adhesive coating were tested using a NDH-2000 turbidimeter/haze meter.

Baige test:

Apply a number of crossed tapes to the optical grade antistatic adhesive coating on the substrate surface and then peel the tape away from the optical grade antistatic adhesive coating.

Peel force test, Figure 3 shows the process of peel force test:

(1) The PET substrate coated with the optical-grade antistatic adhesive coating described above was cut into test pieces 310 having a width of 25 mm and a length of 300 mm, and three test pieces 310 were prepared for each sample.

(2) A steel sheet 320 (for example, 304 or 302 stainless steel) is provided, wherein the steel sheet 320 has a thickness of 1.1 mm or more, a width of about 50 mm, a length of about 150 mm, and a surface roughness of 50 ± Within the 25 nm range.

(3) The surface of the steel sheet 320 is first wiped with a volatile solvent such as MEK, n-ethane or acetone, and left for 5 minutes to completely dry the surface. If it is not used for more than 10 hours, the steel sheet 320 needs to be washed again.

(4) Pressing is performed by using a roller 330, wherein the roller 330 is a metal wheel having a width of 45±1.5 mm and a diameter of 85±2.5 mm, and the outer wheel is covered with a rubber of 6 mm thick, the rubber hardness is 80±5 Hs, and the roller 330 weight is 2040. ±45 g.

(5) The front end of the test piece 310 is left at about 12 mm, and the test piece 310 is rolled back and forth by the roller 330 to be pressed against the steel piece 320.

(6) The peeling force required when the steel sheet 320 peeled off the test piece 310 was tested using a two-column tensile tester.

Surface impedance test:

The impedance of the optical grade antistatic adhesion coating was measured using a Mitsubishi high resistivity meter MCP-HT450.

According to the data shown in Table 1, the optical grade antistatic adhesive coatings produced by the methods described in the above Examples 1 to 4 have surface resistance values of less than 10 ¹⁰ Ω/□, compared to the surface of the PET substrate. The impedance value (about 10 ^12~13 Ω/□) is much lower. Therefore, the optical grade antistatic adhesive coating of the present invention can provide an ideal antistatic property. Further, the performance of the peeling force also shows that the optical grade antistatic adhesive coating of the present invention has an ideal adhesive effect. Of course, the optical grade antistatic adhesive coating of the present invention also exhibits desirable light transmittance and haze in terms of optical properties. Therefore, it can be seen from the characteristics presented in Table 1 that the optical grade antistatic adhesive coating of the present invention meets the optical grade coating requirements and provides good adhesion characteristics and antistatic properties.

It is worth mentioning that, since the optical grade antistatic adhesive coating of the present invention has the above characteristics, the optical grade antistatic adhesive coating of the present invention can be applied not only to be coated on a substrate but also to form a protective film. Adhesive layer of an electronic device. For example, when the optical grade antistatic adhesive coating described in various embodiments of the present invention is applied to the polarizing plate 100 of FIG. 1, it may be disposed between the cellulose triacetate film 140 and the release film 160 to replace the original one. Adhesive 150.

In summary, the present invention selects an antistatic material that can be combined with a hardener to produce an optical grade adhesive coating having an antistatic effect. Moreover, in the preparation of the coating for the optical-grade antistatic adhesive coating of the present invention, the antistatic material is combined with the hardener to be mixed with the polyacrylic polymer material to form the desired adhesive coating. As a result, an antistatic material is distributed inside the optical grade antistatic adhesive coating to improve the antistatic effect of the optical grade antistatic adhesive coating. Therefore, the optical grade antistatic adhesive coating of the invention can be applied to the substrate as a protective sheet of the polarizing plate to provide a desired antistatic effect, and can also serve as an adhesive layer for adhering the two objects to provide an antistatic effect for the two objects.

Although the present invention has been disclosed in the above embodiments, it is not intended to limit the invention, and any one of ordinary skill in the art can make some modifications and refinements without departing from the spirit and scope of the invention. The scope of the invention is defined by the scope of the appended claims.

100. . . Polarizer

110, 200. . . Protective film

120, 140. . . Triacetate film

130. . . Polyvinyl alcohol film

150. . . Adhesive

160, 240. . . Release film

210. . . Substrate

220. . . Wear layer

230. . . Optical grade antistatic adhesive coating

232. . . Matrix

234. . . Antistatic material

242. . . Release substrate

244. . . Release coating

252, 254. . . Antistatic layer

310. . . Audition

320. . . Steel sheet

330. . . Wheel

FIG. 1 is a schematic view of a known polarizing plate.

2 is a schematic view of a protective film having antistatic capability according to an embodiment of the invention.

Figure 3 illustrates the process of the peel force test.

200. . . Protective film

210. . . Substrate

220. . . Wear layer

230. . . Optical grade antistatic adhesive coating

232. . . Matrix

234. . . Antistatic material

240. . . Release film

242. . . Release substrate

244. . . Release coating

252, 254. . . Antistatic layer

Claims (11)

An optical grade antistatic adhesive coating coated on a substrate, the optical grade antistatic adhesive coating comprising: a substrate comprising a polyacrylic polymer material cured by a hardener, wherein the hardener The material includes an isocyanate; and an antistatic material, including polyethylene glycol (PEG), diundecyl amine, triphenyl phosphorite or a combination thereof, the antistatic material It is distributed inside the matrix composed of the polyacrylic polymer material, wherein the antistatic material and the hardener are compoundable. The optical-grade antistatic adhesive coating according to claim 1, wherein the antistatic material is more distributed on the surface of the substrate composed of the polyacrylic polymer material. The optical grade antistatic adhesive coating according to claim 1, wherein the polyacrylic polymer material comprises a urethane acrylic resin, a polyester acrylic resin, an epoxy acrylic resin, an aliphatic polyurethane hexaacrylate oligomer, Aliphatic urethane diacrylate oligomers or combinations thereof. The optical grade antistatic adhesive coating of claim 1, wherein the antistatic material comprises a cationic group type antistatic material having a solid content of more than 10% by weight. The optical grade antistatic adhesive coating of claim 1, wherein the substrate comprises a flexible substrate or a rigid substrate. A method for preparing an optical grade antistatic adhesive coating, comprising: Preparing a first formulation with an acrylic high-strength material and a solvent; preparing a second formulation with a hardener and an antistatic material, wherein the antistatic material comprises polyethylene glycol (PEG), double Diundecyl amine, triphenyl phosphorite or a combination thereof, the material of the hardener comprises an isocyanate, and the antistatic material is compoundable with the hardener; and uniformly mixing the first The formulation and the second formulation are prepared to form the optical grade antistatic adhesive coating. The method for preparing an optical grade antistatic adhesive coating according to claim 6, wherein the polyacrylic polymer material comprises a urethane acrylate resin, a polyester acrylate resin, an epoxy acrylate resin, and an aliphatic urethane hexaacrylate oligomer. , an aliphatic urethane diacrylate oligomer or a combination thereof. The method for preparing an optical grade antistatic adhesive coating according to claim 6, wherein the antistatic material comprises a cationic group type solution having a solid content of more than 10% by weight. The method for producing an optical grade antistatic adhesive coating according to claim 6, wherein the solvent comprises a toluene solvent. A method for preparing an optical grade antistatic adhesive coating, comprising: preparing the optical grade antistatic adhesive coating according to the preparation method of the optical grade antistatic adhesive coating according to claim 6; the optical grade antistatic adhesive coating Coating on a substrate; and performing a curing process to cure the optical grade antistatic adhesive coating on the substrate to an optical grade antistatic adhesive coating. The method for preparing an optical grade antistatic adhesive coating according to claim 10, wherein the curing process comprises a heat curing process.