TWI566931B - Non-substrate type adhesive transper tape for transper printing and preparation method thereof - Google Patents

Description

Substrate-free adhesive transfer belt for transfer printing and manufacturing method thereof

This specification discloses a method for performing transfer printing on a panel or a screen such as an industrial machine or an IT electronic device (telephone, tablet, television, etc.), such as patterning, printing, vapor deposition, or the like. A substrate-free adhesive transfer belt and a method of manufacturing the same.

It is used for decoration on panels and screen tempered glass (such as tempered glass for touch screen panels) used in industrial equipment and IT electronic equipment (telephone, tablet, TV, etc.).

One method for such decoration is to directly form a pattern, print, or metal vapor deposition on the tempered glass.

However, in the manner in which the decorative effect is directly imparted to the tempered glass, there is a problem that the price of the tempered glass is high and the production cost is lowered because the production yield is low.

In addition, Japanese Laid-Open Patent Publication No. 2013-0071582 discloses a method of forming a pattern on a scattering film, printing, metal deposition, or the like, and adhering the scattering preventing film to the tempered glass.

Fig. 1 is a schematic view showing a conventional method for preventing a scattering film, and Fig. 2 is a schematic view showing a structural section of a conventional scattering preventing film.

Specifically, as shown in FIG. 1, in the past, the scattering preventing film is formed on the opposite side of the substrate film (1) after forming the underlayer (2) on one side of the substrate film (1). 3. Next, the adhesive layer (3) and the release film layer (4) are bonded. Next, a protective film layer (5) is adhered to the upper layer (2) to produce a scattering preventing film as shown in FIG. Since the scattering preventing film is provided with the release film layer (4) and the protective film layer (5) sandwiching the base film (1) of the adhesive layer (2) and the adhesive layer (3), it is also called Adhesive film is attached to the substrate.

In the step of preventing the scattering film from being formed after the film is formed, after the protective film layer (5) is removed, the printing and pattern layer (6) is formed on the upper surface of the underlayer by pattern, printing, vapor deposition, or the like, and the release film layer is removed. After that, it is adhered to the adherend (7) of tempered glass or the like (see Fig. 1). As a result, the decoration can be carried out by adhering the printing and pattern layer (6) of the scattering preventing film to the adhering body 7 such as tempered glass.

However, the anti-scattering film manufactured by the above method has a relatively thick overall thickness because the base film (1) is sandwiched in the intermediate portion (reference data: the thickness of the substrate film is usually 50 to 125 μm), particularly the bottom layer (2). The thickness of each of the base film (1) and the adhesive layer (3) is usually about 80 to 155 μm.

Further, as described above, since the base film is sandwiched between the intermediate portions, there is a problem that the optical characteristics are extremely poor (the scattering film is prevented from having a total light transmittance of 88 to 92% and a haze of 1%).

An object of an embodiment of the present invention is to provide a method for directly performing decoration on a panel and a screen of an industrial machine and an IT electronic device (telephone, tablet, television, etc.) compared to a tempered glass of a panel. A substrate-free adhesive transfer belt for transfer printing and a method of manufacturing the same, which can not only easily carry out decoration but also reduce production cost.

Further, another object of an embodiment of the present invention is to provide a substrate-free adhesive transfer belt for transfer printing which can reduce the thickness of an adhesive tape and which can ensure excellent light characteristics, and a method of manufacturing the same.

Further, it is only another object of the embodiment of the present invention to provide a method for removing a release film from a substrate-less tape for transfer printing in order to form a printing and pattern layer before transfer, without causing a floating phenomenon or a tunnel phenomenon. Deformation or damage, a substrate-free adhesive transfer tape for transfer printing that can be easily removed from the bottom layer without any deformation or damage on the adhesive layer, and the adhesive layer can be held on the other release film. And its manufacturing method.

Further, another object of the embodiment of the present invention is to provide a method for producing a substrateless tape for transfer printing which can improve the high temperature and high humidity reliability of the substrate-free film for transfer printing.

Embodiments of the present invention provide a substrate-free adhesive transfer tape for transfer printing, comprising: a light release release film; a bottom layer disposed on a side of the light release release film; a layer on a side of the bottom layer; and a peeling release film on the side of the adhesive layer; the light release release film is firstly contacted by a first base film and the bottom layer The release layer is composed of a second base film and a second release layer in contact with the adhesive layer, and the peeling force of the light release release film is lower than the peeling force of the release release film small.

In the illustrated embodiment, the peeling force of the bottom layer and the light release release film is P1, the peeling force of the adhesive layer and the medium release release film is P2, and the P2/P1 system is 2.0 to 5.0.

In the illustrated embodiment, the peeling force P1 of the underlayer and the light release release film is 1 to 5 gf/25 mm, and the peeling force P2 of the adhesive layer and the medium release release film is 2 to 25 gf/25 mm.

In the illustrated embodiment, the adhesion of the adhesive layer is preferably from 1000 gf to 3000 gf/25 mm.

In the illustrated embodiment, the surface tension of the underlayer is preferably lower than the surface tension of the first release layer of the light release liner.

In the illustrated embodiment, the surface tension of the first release layer is preferably 35 to 45 dyne.

In the illustrated embodiment, the surface tension of the bottom layer is preferably 25 to 35 dyne.

In an exemplary embodiment, the first release layer is applied to the first base film in such a manner that the bottom surface does not cause undulation due to the surface roughness of the first base film, and may have, for example, 0.5 to 3 g/m ² . Release agent coating amount.

In the illustrated embodiment, the underlayer is preferably bonded to the adhesive layer after heat curing.

In the illustrated embodiment, the sum of the thickness of the underlayer and the adhesive layer is preferably 10 to 30 μm.

In the illustrated embodiment, the substrate-free adhesive transfer belt may have a total light transmittance of 99% or more and a haze of 0.15% or less.

In still another embodiment of the present invention, there is provided a method for manufacturing a substrate-free adhesive transfer tape for transfer printing, wherein the substrate-free adhesive transfer tape is stacked with a light release release film, a bottom layer, an adhesive layer, And peeling off the release film.

In an exemplified embodiment, the manufacturing method comprises the steps of: forming a first release layer on a side of the first base film to form a light release release film; forming a bottom layer on the first release layer; Forming a second release layer on the base film to form a medium release release film; in the second release layer An adhesive layer is formed on the adhesive layer; and the release release film and the light release release film formed with the underlayer are formed in the adhesive layer.

In an exemplified embodiment, the manufacturing method comprises the steps of: forming a first release layer on a side of the first base film to form a light release release film; forming a bottom layer on the first release layer; Forming an adhesive layer thereon; forming a second release layer on the second base film to form a medium release release film; and laminating the light release release film having the adhesive layer and the bottom layer and the medium release release film. Further, at this time, the underlayer is preferably bonded to the adhesive layer after the base composition is thermally cured.

When the embodiment of the present invention is used for the decoration of panels and screens of industrial equipment and IT electronic equipment (telephone, tablet, television, etc.), it is not directly applied to the tempered glass of the panel, but is transferred. Since the decoration is easy to implement, the decoration can be easily implemented and the production cost can be reduced as compared with the direct decoration of the tempered glass.

Further, by using a non-substrate method in which the base film is not interposed between the underlayer and the adhesive layer, the thickness of the entire adhesive film can be reduced and excellent light characteristics can be ensured.

Furthermore, by forming a light release release film on the underlayer in the substrateless tape for transfer printing, and forming a release release film on the adhesive layer, the peeling force between the bottom layer and the adhesive layer is different, and the transfer is performed. When the front printing and pattern portions are formed, the light release release film is not easily floated from the bottom layer of the printing and patterning portion, or is tunneled, etc., and can be easily removed, and the underlayer and the adhesive layer can be held on the intermediate release film. It can avoid deformation or damage on the bottom layer and the adhesive layer.

Further, the high temperature and high humidity reliability of the substrate-free film for transfer printing can be improved.

1‧‧‧Base film

2‧‧‧ bottom layer

3‧‧‧Adhesive layer

4‧‧‧ release film

5‧‧‧Protective film

6‧‧‧Printing and patterning

7‧‧‧ Attachment

10‧‧‧Light peeling release film

11‧‧‧First base film

12‧‧‧First release layer

20‧‧‧ bottom layer

30‧‧‧Adhesive layer

40‧‧‧ peeling release film

41‧‧‧Second release layer

42‧‧‧Second base film

50‧‧‧Printed and patterned layers

60‧‧‧ carrier film

70‧‧‧Strengthened glass

100‧‧‧ (Before transfer and printing) non-substrate adhesive transfer tape

101‧‧‧No substrate adhesive transfer tape after printing

102‧‧‧Transfer-free substrate-free adhesive transfer belt

Fig. 1 is a flow chart schematically showing a conventional method for producing a scattering preventing film and a specific expression method for using the decorative effect thereof.

Fig. 2 is a schematic view showing a structural section of a conventional scattering preventing film.

Fig. 3 is a schematic view showing a structural cross section of a substrate-free adhesive transfer belt according to an embodiment of the present invention.

Fig. 4 is a flow chart schematically showing a method of manufacturing a substrate-free adhesive transfer belt for transfer printing according to an embodiment of the present invention and a concrete expression method for using the same.

Figure 5 is a schematic view showing a substrate-free adhesive for transfer printing according to another embodiment of the present invention. A flow chart of a method for producing a transfer belt and a specific expression method for using the decorative effect thereof.

Fig. 6 is a view showing a non-substrate adhesive transfer tape of another embodiment of the present invention, in which a light release release film is removed, and a decorative process such as printing, vapor deposition, or the like is applied, and a carrier film is bonded and decorated before transfer. A schematic view of the structural section of the belt.

Fig. 7 is a schematic view showing a structural cross section of a non-substrate-adhesive transfer belt after transfer of the detached release film in the adhesive film after the decoration in Fig. 6 and transfer to the tempered glass to remove the carrier film.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.

In the present specification, the non-substrate adhesive transfer belt means that only the underlying layer and the adhesive layer are present between the lightly peeling release film and the medium release release film, and the base layer and the adhesive layer are not sandwiched. The transfer belt of the material is transferred to the transfer belt of the attachment of the panel or the screen. This is in contrast to the attached substrate adhesive tape sandwiched between the substrate on which the underlayer and the adhesive layer are formed.

The term "adhered body" as used in the present specification refers to a member to which a substrate-free adhesive transfer belt for transfer printing according to an embodiment of the present invention is applied, and is, for example, a tempered glass panel that is assembled in general industrial equipment, IT electronic products, and display devices. Or a decorative component such as a screen.

The term "printing and pattern layer" as used herein refers to a layer that performs decoration such as pattern formation, printing, and vapor deposition.

The term "light release release film" as used herein means a film having a lower peeling force than a release release film.

The term "peel release film" as used herein refers to a film having a higher peeling force than a light release release film.

Fig. 3 is a schematic cross-sectional view showing a structure of a substrate-free adhesive transfer belt (100) (for transfer and printing) according to an embodiment of the present invention.

As shown in FIG. 3, the (transfer and pre-transfer) substrate-free adhesive transfer belt (100) of the present invention has a stack of a light release release film (10), a bottom layer (20), and an adhesive layer ( 30), a structure in which the release film (40) is peeled off. The light release release film (10) is composed of a first base film (11) and a first release layer (12), and the first release layer (12) is in contact with the bottom layer (20). Release film (40) consists of a second The base film (42) and a second release layer (41) are formed, and the second release layer (41) is in contact with the adhesive layer (30).

In the substrate-free adhesive transfer belt for transfer printing according to the embodiment of the present invention, the printing and pattern formation before transfer are directly performed on the underlayer. That is, the underlayer (20) is a printing and pattern layer forming portion in which a printing and pattern layer is formed. Therefore, it is necessary to peel off the light release release film (10) first, and it is necessary to avoid floating or tunneling on the bottom layer, and other deformation or damage when it is peeled off. In addition, the underlayer (20) and the adhesive layer (30) need to be adhered to the release liner film (40).

In the illustrated embodiment, the peeling force of the bottom layer (20) and the light release release film (10) is P1, and the peeling force of the adhesive layer (30) and the medium release release film (40) is P2. P2/P1 should be 2.0~5.0.

Because the difference in the release force of the light release release film (10) and the medium release release film is small, the adhesion layer (30) or the bottom layer (20) may be damaged when the light release release film (10) is removed. Therefore, it is desirable to increase the difference in the release force between the light release release film (10) and the release release film (40).

In one embodiment, the peeling force of the light release release film (10) is preferably from 1 to 5 gf/25 mm, and the peeling force of the release release film (40) is preferably from 2 to 25 gf/25 mm. When the peeling force of the light release release film (10) is less than 1 gf/25 mm, the underlayer (20) is not easily protected by problems such as floating or tunneling with the underlayer (20), and when it exceeds 5 gf/25 mm The underlayer (20) or the adhesive layer (30) may be peeled off when peeling off the light release release film (10).

Further, the release force of the release release film (40) is preferably such that the peeling force of the intermediate release film (40) does not exceed 30 gf / 25 mm even after being left at 70 ° C for 24 hours. The reason is that a carrier film (60) is adhered to the printing and pattern layer after the printing and pattern layer is formed, and the peeling force between the peeling release film (40) and the adhesive layer (30) is higher than that of the carrier film ( 60) When the peeling force between the printing and pattern layers is high, it may be difficult to peel off the release film (40) during peeling.

The following is a detailed description of each configuration.

The first base film (11) and the second base film (42) are optical films made of a heat resistant material, and include a heat resistant resin (for example, polyethylene terephthalate). PET), polyethylene naphthalate, polybutylene terephthalate, etc., and preferably PET film, the first a base film (11) and/or the second base film An unlimited limitation of the thickness of (42) may be a thickness having a range of 25 to 188 μm.

In one embodiment, the tensile strength of the first base film (11) and/or the second base film (42) may be 22.0±8 kgf/mm ² in the MD direction (width direction) in the TD direction (longitudinal direction). ) can be 30.0 ± 9kgf / mm ² . Further, the elongation ratio of the first base film (11) and/or the second base film (42) may be 150±80% in the MD direction and 100±80% in the TD direction.

Further, in one embodiment, the second base film (42) (the base film of the intermediate release film) is preferably a film having an alignment angle of 6 (degrees) or less. More specifically, the alignment angle is preferably 0 to 6°. The alignment angle refers to the angle at which the base film extends when the second base film (42) is manufactured, which indicates the inclination of the alignment main axis. When the angle of the alignment angle is 6 or less, when the adhesive film is adhered to the adherend in a later step, impurities existing in the adherend are easily observed. Therefore, the accuracy in checking the impurities on the adherend can be improved.

The first release layer (12) coated on the surface of the first base film (11) preferably has a high surface tension (higher surface tension than the bottom layer) for forming the bottom layer (20), and preferably has a bottom layer (20) The low release force at the interface.

The surface tension of the first release layer (12) is preferably from 30 to 50 dyne, more preferably from 35 to 45 dyne. The release agent of the first release layer (12) is not particularly limited, but a non-lanthanum melamine-based or acrylic release agent is preferably used. Further, the hardening method may be performed by heat hardening or by heat. UV hardening method.

The coating amount of the release agent contained in the first release layer (12) is not particularly limited, but in view of the release property, it is preferably in the range of 0.3 to 4 g/m ² , more preferably in the range of 0.5 to 3 g/m ² . . When the coating amount is low, since the surface roughness of the first base film (11) affects the bottom layer (20) (that is, avoiding undulation on the bottom surface due to the surface roughness of the first base film), Maintain a certain amount of coating.

The release agent of the second release layer (41) is not particularly limited. However, in order to apply an additional type which has a release property to an acrylic adhesive, it is preferably produced at a drying temperature of 130 ° C or lower. When the film is produced at 130 ° C or higher, transverse wrinkles and/or vertical wrinkles occur due to heat shrinkage of the film. Further, as the unheated oxime release agent, an ultraviolet ray-curable acryl hydrazine, a hydrazine-containing hydrazine, and an epoxy group-containing oxime may be used.

The release layer (first and/or second release layer) to the base film (first and / or second base) The formation of the base film can be carried out by a coating method generally used in the technical field. Specifically, for example, the release agent is applied to the base film by various methods such as gravure coating, Meyer bar coating, air knife coating, and blade coating, and then subjected to heat treatment, ultraviolet irradiation, or the like. It can be formed by drying and hardening.

Further, in the case of the underlayer (20), the adhesion of the printing and pattern layer formed on the underlayer (20) to the underlayer (20) in the subsequent process is important. Therefore, it is necessary to form a surface tension higher than that of the resin of the printing and pattern layer (for example, an ultraviolet curable resin and a printing ink resin). Furthermore, in order to form the underlayer (20) on the light release release film (10), the surface tension of the bottom layer (20) must be higher than the first release layer (12) of the light release release film (10). The surface tension is low. Therefore, the surface tension of the bottom layer (20) is preferably 25 to 35 dyne. The material for the underlayer can be formed by using a combination of a monomer such as urethane acrylate, acryl acrylate or epoxy acrylate, an oligomer, a polymer, etc., and a photoinitiator can be added in a hardened manner. Or hardener.

The formation of the underlayer (20) can also be carried out using a coating method generally used in the art. Specifically, the underlayer composition is applied to the first release layer (12) by various methods such as gravure coating, Meyer bar coating, slot die coating, air knife coating, and blade coating. After drying, it can be achieved by drying or hardening by heat hardening or ultraviolet curing.

In the illustrated embodiment, when the underlayer (20) is formed, it is preferred to use a thermosetting method. For this reason, chemical bonding strengthening of the underlayer (20) and the adhesive layer (30) can be achieved, and high reliability can be obtained in terms of adhesion of the adhesive layer (30) to the underlayer (20). The hardening reaction is completed with respect to the ultraviolet curing method, and the underlayer (20) of the thermosetting mode is maintained in an unreacted state, and the state of chemical bonding with the adhesive layer (30) can be retained in the adhesive layer ( 30) High reliability is obtained in terms of adhesion to the underlayer (20).

Further, the adhesive layer (30) can be applied to all of the adhesives generally used in the art.

In the illustrated embodiment, the main component of the adhesive composition is preferably an acrylic copolymer. It is more preferable to use a copolymer obtained by polymerizing an acrylate monomer having 4 to 20 carbon atoms to ensure transparency. When a monomer of 20 or more carbon atoms is used for copolymerization, steric hindrance due to interference of the orbital (Orbital) causes an increase in the ratio of unreacted monomers, and bubbles, spots, and the like occur in adhesion reliability. . In addition, a total of 4 or less carbon atoms are used. At the time of polymerization, vaporization easily occurs, resulting in an increase in internal pressure, causing problems of copolymerization imbalance and safety.

In one embodiment, when the acrylic copolymer is synthesized, it is preferred to further contain a crosslinkable functional group. In the case of a copolymer having no functional group, the cohesive force between the adhesives is poor, and problems such as floating, bubbles, and transfer occur when reliability is evaluated. The functional group is preferably a monomer having a carboxyl group, a single hydroxyl group, or a complex comprising a carboxyl group and a hydroxyl group. It is more preferred to use a monomer having only a hydroxyl group. A monomer containing a carboxyl group may cause corrosion or oxidation of the adhesion surface due to a strong reaction force, which may adversely affect product reliability.

In one embodiment, the structure of the above-mentioned copolymer is preferably a crosslinking agent reactive with a hydroxyl group for the purpose of enhancing cohesive force and durability. As the crosslinking agent, a compound such as a diisocyanate, a tetrafunctional epoxide, a metal chelate compound, a guanamine or an amine can be used. Among them, an isocyanate compound having a hexamethylene diisocyanate (HMDI) structure which can maintain the transparency of the adhesive and has excellent adhesion to various surface layers is preferably used.

In one embodiment, the molecular weight of the adhesive is preferably about 700 to 1.5 million, and the peeling transfer temperature (Tg) is preferably -50 to -10 °C. When the peeling transition temperature is too low, the cohesive force of the adhesive is lowered, and if the peeling transition temperature is too high, the adhesion to the adherend is lowered.

Further, in one embodiment, the crosslinking agent is reacted with the adhesive functional group, and the gel fraction is preferably 60% or more, more preferably 60 to 80%. The higher the gel fraction, the better the cohesive force and heat resistance of the adhesive layer (30), and the excellent physical properties. However, when the adhesive layer (30) is too hard by a gel fraction of more than 80%, there is no basis. The adhesive tape is adhered to the attached body, and when stored under high temperature and high humidity conditions, bubbles or tunneling may occur.

In one embodiment, a decane coupling agent may be added to the adhesive composition. The aforementioned decane coupling agent is preferably a cyclodecane coupling agent containing an epoxy group. The epoxy group of the decane coupling agent is combined with the reactive group of the copolymer, and the alkoxy decane moiety is combined with the adhesive of the applicable adhesive to improve the stability of the bonding, and is placed for a long period of time under high temperature and high humidity conditions. The role of preventing the deterioration of the force.

In another embodiment, in the adhesive composition, a plasticizer, an epoxy resin, a curing agent, or the like may be further blended for specific purposes, and a UV stabilizer or an antioxidant may be further added for general purposes. Wait.

By way of non-limiting example, the adhesive layer (30) may contain 0.1 to 0.3 parts by weight of the isocyanate curing agent and 0.01 to 1.0 part by weight of the decane coupling agent to 100 parts by weight of the acrylic pressure-sensitive adhesive composition. Further, the weight portion of the acrylic pressure-sensitive adhesive composition may contain 0.1 to 2.0 parts by weight of the epoxy-based curing agent.

In one embodiment, the adhesive layer (30) is preferably applied in an amount of 5 to 50 g/m ² . More preferably 10~20g/m ² . When the coating amount is less than 5 g/m ² , the adhesion is remarkably lowered, and the problem of floating occurs during the reliability evaluation. When the coating amount is 50 g/m ² or more, the adhesion resistance due to the adhesive viscoelasticity of the adhesive may occur.

In addition, the adhesive layer (30) preferably has an adhesion of 1000 to 3000 gf / 25 mm. When the adhesion is less than 1000gf/25mm, bubbles or tunneling may occur when stored under high temperature and high humidity conditions while being adhered to the attached body. In addition, when it exceeds 3000 gf / 25 mm, it cannot remove in the case where it is badly bonded to the attachment body, such as a tempered glass, and it raises the manufacturing cost.

The application of the adhesive can be carried out by a coating method generally used in the art, and although not particularly limited, specifically, a metal coater, a nip coater, a rot roll coater, a spot coater can be used. (Comma coater) and so on.

The substrate-free adhesive transfer belt for transfer printing according to the exemplified embodiment of the present invention can be formed to be extremely thin, and the sum of the thicknesses of the underlayer (20) and the adhesive layer (30) is about 10 to 30 μm.

Further, the substrate-less adhesive transfer belt for transfer printing according to the embodiment of the present invention is preferably excellent in optical characteristics, for example, exhibiting a total light transmittance of 90% or more, and more preferably exhibiting a total light transmittance of 99% or more.

Hereinafter, the manufacturing method of the embodiment of the present invention will be described in detail.

The embodiment of the present invention can stack a light release release film (10), a bottom layer (20), an adhesive layer (30) and a release release film (40) to manufacture the aforementioned substrate-free adhesive transfer tape. .

Fig. 4 is a flow chart schematically showing a method of manufacturing a substrate-free adhesive transfer sheet for transfer printing according to an embodiment of the present invention.

In one embodiment, a method for manufacturing a substrate-free adhesive transfer belt of the transfer method of the present invention is as shown in FIG. 4, and a first release layer (12) is formed on a surface of a first base film (11). Forming the light release release film (10) (A of FIG. 4), forming the bottom layer (20) on the first release layer (12) (B of FIG. 4), and forming a second base film Forming a second release layer (41) on (42) to form the middle After peeling off the release film (40), after forming the adhesive layer (30), the adhesive layer (30) is bonded to the bottom layer (20) (Fig. 4C), and the substrate-free adhesive transfer can be manufactured. Belt (D of Figure 4).

Fig. 5 is a flow chart schematically showing a method of manufacturing a substrate-free adhesive transfer belt for transfer printing according to another embodiment of the present invention.

In another embodiment, the method for manufacturing the substrate-free adhesive transfer belt of the transfer method of the present invention is as shown in FIG. 5, and the first release layer is formed on one side of the first base film (11). And forming the light release release film (10) (A of FIG. 5), forming the bottom layer (20) (B of FIG. 5) on the first release layer (12), and at the bottom layer (20) Forming the adhesive layer (30), and the intermediate release film (40) and the adhesive layer (30) on which the second release layer (41) is formed on the second base film (42) The adhesive (Fig. 5, C') can be used to produce a substrate-free adhesive transfer belt (Fig. 5, D).

In the above manufacturing method, it is preferable to use a method as shown in FIG. 5, because the adhesion between the underlayer (20) and the adhesive layer (30) is superior to that of the manufacturing method shown in FIG. 4, and transfer printing can be improved. High temperature and high humidity reliability without substrate film.

The substrate-free adhesive transfer belt manufactured by the above-described production method can be subjected to a post-process (printing process before transfer). That is, when referring again to E in FIG. 4 and E in FIG. 5, the subsequent process is to remove the light release release film (10) [the first base film (11) + the first release layer (12) After performing the pattern, printing, vapor deposition, etc., and forming the printing and pattern layer (50), a carrier film (60) is adhered to the printing and pattern layer, and the printing is performed before the transfer as shown in FIG. The subsequent substrate-free adhesive transfer belt (101) (see Fig. 6).

Further, when referring again to F in FIG. 4 and F in FIG. 5, the intermediate release film (40) is removed from the substrate-free adhesive transfer belt (101) before the transfer [the second base film (42) + The second release layer (41)] can be transferred to an attachment such as one of tempered glass (70). Further, when the carrier film (60) is removed, the transfer-free substrate-free adhesive transfer belts (2) and (102) having the structure shown in Fig. 7 can be finally produced (see Fig. 7).

Hereinafter, embodiments of the invention will be further described in detail by way of examples of the invention. The following examples are provided to assist the understanding of the present invention and are not intended to limit the scope of the invention.

[Example 1]

In the first base film (thickness 75 μm) composed of polyethylene terephthalate On the surface of the melamine resin, 100 parts by weight of the melamine-based resin was blended with the weight portion of the curing agent and 300 parts by weight of the organic solvent to form a first release layer (thickness: 0.7 μm).

Next, on the first release layer, the urethane acrylate 100 parts by weight of the curing agent 3 parts by weight, the acrylic leveling agent 0.2 parts by weight, and the organic solvent 300 parts by weight are subjected to concave roll coating to form an underlayer. After the thickness (5 μm), the underlayer was cured by ultraviolet rays.

Further, on the surface of the second base film (thickness: 100 μm) made of polyethylene terephthalate, the weight of the release agent 100 is added to the weight of the hardener 1 and the weight of the organic solvent by 600 parts. The concave roll was coated to form a second release layer (thickness 0.7 μm).

In the second release layer, 100 parts by weight of the acrylic copolymer containing a hydroxyl group as a functional group is blended with 0.2 parts by weight of an isocyanate-based curing agent and 50 parts by weight of an organic solvent, and a slit die is applied to form an adhesive layer ( After the thickness was 10 μm, the substrate was bonded to the underlayer to produce a substrate-free adhesive transfer belt (see Fig. 4).

[Embodiment 2]

In comparison with the first embodiment, after the underlayer is formed, the adhesive layer direct-slot die is applied to the underlayer, and then the substrate-free adhesive transfer tape is produced in the same manner except that the release film is peeled off during the bonding (refer to Figure 5).

[Example 3]

Compared with the foregoing Example 1, except that the bottom layer (thickness 5 μm) is a weight of 5 parts by weight of the urethane acrylate, 5 parts by weight of the hardener, and 300 parts by weight of the organic solvent, after the formation by the concave roll coating method, the bottom layer is heated. In addition to hardening, a substrate-free adhesive transfer belt was produced in the same manner.

[Comparative Example 1]

After the underlayer (thickness: 5 μm) was formed on the surface of the polyethylene terephthalate base film (thickness: 100 μm), an adhesive layer (thickness: 25 μm) was formed on the surface on the opposite side. The constitution of the underlayer and the adhesive layer is the same as that of the first embodiment.

Next, the adhesive layer is adhered to the release film layer (the release film layer has the same structure as the release release film layer of the foregoing embodiment), and is adhered to the bottom layer by polyethylene terephthalate. A protective film layer (thickness: 60 μm) was used to produce a film of Comparative Example 1.

[Comparative Example 2]

Compared with the foregoing Comparative Example 1, the protective film layers (thickness 60 μm) having different thicknesses are sequentially stacked, A film of Comparative Example 2 was produced by a primer layer (thickness: 5 μm), a base film layer (thickness: 50 μm), an adhesive layer (thickness: 25 μm), and a release film layer (thickness: 75 μm).

[Experimental example]

The physical properties of the samples of the examples and the comparative examples were measured.

The release adhesive force and the adhesive force of the substrate-free adhesive transfer belts of the above Examples 1 to 3 were measured. Further, in the films of Comparative Examples 1 and 2, since the light release film and the release film were not peeled off, only the adhesion was measured.

Specifically, the samples of the manufactured examples and comparative examples were cut in the machine direction to have a width of 25 mm and a length of 250 mm.

For each of Examples 1 to 3, an adhesive force measuring device (CKP-5000) was used, and the peeling force at a peeling speed of 300 m/min was peeled off by a 180° peeling test method to measure the light peeling release peeling force. Further, the test piece subjected to the release peeling test was attached to a TESA 7475 tape by an automatic laminator (load: 2 kg), and stored at 25 ± 2 ° C for 30 minutes. The peeling peeling force was measured by using an adhesion tester (CKP-5000) by a 180° peeling test method and peeling at a peeling speed of 300 m/min. The test piece to be tested was attached to a glass or stainless steel plate (SUS plate) (this corresponds to the attached body) by an automatic laminator (load weight 2 kg), and stored at 25 ± 2 ° C for 30 minutes. The adhesion was measured by using an adhesion tester (CKP-5000) using a 180° peel test method and peeling at a peeling speed of 300 m/min.

After removing the release film of Comparative Examples 1 and 2, the film was bonded to a glass or SUS plate (here, corresponding to the adherend) by an automatic laminator (load: 2 kg), and stored at 25 ± 2 ° C for 30 minutes. The adhesion was measured by using an adhesion tester (CKP-5000) using a 180° peel test method and peeling at a peeling speed of 300 m/min.

Further, in Examples 1 to 3 and Comparative Examples 1 and 2, total light transmittance and haze were measured, and high-temperature and high-humidity reliability evaluation was performed.

The haze was measured using JIS K7136 and equipped with NDH2000 equipment.

The total light transmittance was measured using JIS K7361 specifications and equipped with NDH2000 equipment.

The high-temperature and high-humidity reliability evaluation was carried out by adhering each sample to the tempered glass, and after standing at 85 ° C and 85% RH for 72 hours, the surface of the test piece was cut into 11 rows of slits at intervals of 1 mm to form 100 slits. After the component, stick the 3M 810D tape and confirm the bottom layer and stickiness when peeling off. Whether the layer interface is detached.

It is evaluated as "very good" if there is no separation between the bottom layer and the adhesive layer interface. In addition, it is evaluated as "ordinary" if there is a part of the separation between the bottom layer and the adhesive layer interface.

Table 1 shows the peeling force P1 of the underlayer of the lightly peeling release film of the example, and the peeling force P2 of the adhesive layer of the centering peeling release film.

Table 2 shows the results of other physical property measurements.

*◎: Very good, △: Normal

* The full thickness in this table refers to the thickness of the bottom layer + the thickness of the base film layer + the thickness of the adhesive layer.

It can be confirmed from the above table that the substrate-free adhesive transfer belts of Examples 1 to 3 of the present invention do not have a substrate film between the underlayer and the adhesive layer, and the comparative examples 1 to 2 of the conventional method for preventing the scattering film are provided with a substrate. membrane.

The sum of the thicknesses of the underlayer, the base film, and the adhesive layer of Comparative Examples 1 to 2 was 130 μm (Comparative Example 1) or 80 μm (Comparative Example 2), and Examples 1 to 3 did not have a base film layer, and the bottom layer and The sum of the thicknesses of the adhesive layers can be remarkably reduced to 15 μm.

That is, the substrate-free adhesive transfer belt of the exemplified embodiment of the present invention can be thinned and thinned in thickness as compared with the conventional method. Further, in Examples 1 to 3, the total light transmittance was 99% or more, and the haze (%) was also found to be a very excellent value of 0.15% or less, and it was confirmed that the optical properties were excellent.

Further, in the substrate-free adhesive transfer belt of the exemplified embodiment of the present invention, in particular, Example 2 in which the adhesive layer was directly applied to the underlayer, showed excellent results in terms of high temperature and high humidity reliability as compared with Example 1. Further, in the case of Example 3 in which the underlayer was thermally cured, even in accordance with the production method of Example 1, excellent results were exhibited in terms of high temperature and high humidity reliability. Therefore, in terms of high temperature and high humidity reliability, the manufacturing method of Example 2 (refer to FIG. 5) or the underlayer is thermally cured, preferably in accordance with the manufacturing method of Embodiment 2 (refer to FIG. 5) and the underlying heat is applied. hardening.

10‧‧‧Light peeling release film

11‧‧‧First base film

12‧‧‧First release layer

20‧‧‧ bottom layer

30‧‧‧Adhesive layer

40‧‧‧ peeling release film

41‧‧‧Second release layer

42‧‧‧Second base film

100‧‧‧ (Before transfer and printing) non-substrate adhesive transfer tape

Claims (15)

A substrate-free adhesive transfer belt for transfer printing, comprising: a light release release film; a bottom layer located on a side of the light release release film; an adhesive layer located at the a surface of the bottom layer; and a peeling release film on the side of the adhesive layer; the light release release film is composed of a first base film and a first release layer in contact with the bottom layer, The medium release release film is composed of a second base film and a second release layer in contact with the adhesive layer. The substrate-free adhesive transfer belt for transfer printing according to claim 1, wherein the peeling force of the bottom layer and the light release release film is P1, and the peeling force of the adhesive layer and the middle release release film It is P2, and P2/P1 is 2.0~5.0. The substrate-free adhesive transfer belt for transfer printing according to claim 2, wherein the peeling force P1 of the bottom layer and the light release release film is 1 to 5 gf/25 mm, and the adhesive layer and the peeling layer are separated The peeling force P2 of the film is 2 to 25 gf / 25 mm. The substrate-free adhesive transfer belt for transfer printing according to any one of claims 1 to 3, wherein the adhesive layer has an adhesion of 1000 to 3000 gf/25 mm. A substrate-free adhesive transfer belt for transfer printing according to claim 1, wherein the surface tension of the underlayer is lower than the surface tension of the first release layer. The substrate-free adhesive transfer belt for transfer printing according to claim 5, wherein the surface tension of the first release layer is 35 to 45 dyne, and the surface tension of the bottom layer is 25 to 35 dyne. The substrate-free adhesive transfer belt for transfer printing according to claim 1, wherein the first release type The layer is applied to the first base film in such a manner that the underlying surface does not undulate due to the surface roughness of the first base film. A substrate-free adhesive transfer belt for transfer printing according to claim 1, wherein the underlayer is bonded to the adhesive layer after heat curing. The substrate-free adhesive transfer belt for transfer printing according to claim 1, wherein the thickness of the underlayer and the adhesive layer is 10 to 30 μm. The substrate-free adhesive transfer belt for transfer printing according to claim 1, wherein the substrate-free adhesive transfer belt has a total light transmittance of 99% or more. The substrate-free adhesive transfer belt for transfer printing according to claim 1, wherein the substrate-free adhesive transfer belt has a haze of 0.15% or less. A method for manufacturing a substrate-free adhesive transfer belt for transfer printing, the substrate-free adhesive transfer belt according to any one of claims 1 to 11, characterized in that: a light release release film is stacked, A bottom layer, an adhesive layer, and a release release film. A method of manufacturing a substrate-free adhesive transfer belt for transfer printing according to claim 12, wherein the manufacturing method comprises the steps of: forming a first release layer on a side of a first base film, and Forming the light release release film; forming the underlayer on the first release layer; forming a second release layer on a second base film to form the intermediate release liner; in the second release The adhesive layer is formed on the layer; and the intermediate release film having the adhesive layer formed thereon and the light release release film having the underlayer formed thereon. A method of manufacturing a substrate-free adhesive transfer belt for transfer printing according to claim 12, wherein the manufacturing method comprises the step of forming the first release layer on a side of the first base film, and Forming the light release release film; forming the underlayer on the first release layer; forming the adhesive layer on the underlayer; forming the second release layer on the second base film to form the middle release layer a film; and the light release release film having the adhesive layer and the bottom layer formed thereon and the release liner film. A method of manufacturing a substrate-free adhesive transfer belt for transfer printing according to claim 14, wherein the underlayer is bonded to the adhesive layer after the base composition is thermally cured.