KR102095541B1 - Donor film having good transfer characteristic for laser induced thermal imaging and manufacturing method thereof - Google Patents

Abstract

The present invention relates to a donor film for thermal transfer of laser light having excellent transfer characteristics and a method for manufacturing the same, in particular, a thermally expandable resin is used as a binder resin for one or both layers of the photothermal conversion layer and the protective layer among the components of the donor film. By using, it provides a donor film for laser light heat transfer that shows improved energy efficiency, enlarged transfer window, and excellent transfer surface quality with high pattern resolution and transmission sensitivity, small image defects, and transfer ability at low laser power. do.

Description

DONOR FILM HAVING GOOD TRANSFER CHARACTERISTIC FOR LASER INDUCED THERMAL IMAGING AND MANUFACTURING METHOD THEREOF}

The present invention relates to a donor film for transfer of laser light having excellent transfer characteristics and a method for manufacturing the same, and more specifically, one or both layers of the photothermal conversion layer and the protective layer among the components of the donor film are thermally expanded as a binder resin. Laser resin thermal transfer donor that improves energy efficiency, enlarges the transfer window, and provides excellent transfer surface quality through the use of a resin, such as high pattern resolution and transmission sensitivity, small image defects, and transfer ability at low laser power. It relates to a film and its manufacturing method.

The thermal image processing process using laser light is generally referred to as laser induced thermal imaging (LITI) or hybrid patterning system (HPS), and uses an organic material or a donor film as a thermal transfer donor element. It is a generic term for all heat transfer elements that transfer inorganic materials to other substrates and / or substrates. Typically, the most common pixel formation method in an organic electroluminescent device among flat panel displays is sublimation of a low molecular organic light emitting material to be deposited by aligning a fine metal mask (FMM) with respect to a substrate in a vacuum chamber. ) To form a light emitting layer only in a desired area. In the case of the FMM method, due to the characteristics of the technology, it is a technology that has many problems in application of a large area due to the weight of the mask frame, difficulty in stretching the mask, sagging of the mask itself, and expansion according to temperature, and a large area of the organic electroluminescent device A new concept of process technology is required for pixel formation.

The ink jet of the laser transfer method (LITI) and the solution process (LITI) is a representative method that has been studied to replace the method of individually forming the red, green, and blue (R, G, B) emitting layers using the existing FMM. (Ink jet) method, a white organic light emitting diode (OLED) and a color filter (Color Filter) method. Among them, the laser technology represented by LITI and Laser Induced Pattern-wise Sublimation (LIPS) or Radiation Induced Sublimation Transfer (RIST) is a laser on a donor film or donor substrate in which a light emitting layer is previously formed. When is irradiated, the light emitting layer is separated from the donor film or donor substrate and transferred to the acceptor substrate to form a pixel. In the case of the LITI process used to form the pixels of the organic electroluminescent device by utilizing the donor film / donor substrate including the photothermal conversion layer described above, several methods for manufacturing the donor film have been proposed.

Referring to FIG. 1, a donor film, which is a type of a conventional laser thermal transfer element, includes a base layer 1, a light-to-heat conversion layer 2, It includes a protective layer (interlayer) (3) and a transfer layer (transfer layer; a layer made of a low-molecular organic light-emitting material and functioned to be transferred to a substrate to form a light-emitting layer) 4. When explaining the method of forming the organic light-emitting layer using the conventional donor film, the transfer layer 4 of the donor film is brought into contact with the acceptor substrate on which the light-emitting layer is to be formed, and the laser light is brought into close contact with the substrate. When is irradiated, as the laser light is converted to heat in the photothermal conversion layer 2 in the donor film to emit heat, the transfer layer 4 is transferred to the substrate to form a light emitting layer on the substrate.

As described above, the above-described conventional donor film comprises a base layer (1), a photothermal conversion layer (2), and a protective layer (3) made of a polymer film, and a light absorber (pigment or dye) by laser light. It is a film that receives low light and converts it to heat to transfer a low molecular organic fluorescent material to be transferred to an acceptor substrate, and has been mainly used and developed for organic electroluminescent devices.

In addition, various methods have been disclosed to solve the problems occurring during the development of such a conventional donor film. For example, Republic of Korea Patent Publication No. 2005-0010615 relates to a donor film for thin film transfer, “PDMS (Polymethyl Siloxane) layer, transfer layer, LTHC layer, which is a photothermal conversion layer, can be manufactured as an optional structural element, and has patented characteristics that can transfer several layers at once with the ability to transfer with less energy ” Doing. In addition, the Republic of Korea No. 2007-0024816 relates to a laser thermal transfer device and a method of manufacturing an organic light emitting device using the same, as a method for resolving adverse effects on the reliability and lifespan of a conventional product, the "substrate and Disclosed is a laser thermal transfer donor film comprising a photothermal conversion layer between transfer layers, wherein a permanent magnet layer is included between at least one of the substrate and the transfer layer. have.

However, in the conventional technique including those disclosed in the above-mentioned documents, there is a disadvantage that a laser transfer process suitable for a laser transfer process has a very narrow range and has limited transfer quality transferred in a high energy region. In addition, there is also a problem that the transfer of a desired type of organic material (low molecular organic fluorescent material) is not smoothly performed due to a large number of pattern defects when forming a fine pattern by a laser.

The present invention has been derived to solve the above problems, and when producing a donor film, a base resin is a resin having thermal expansion property of one or both layers of the photothermal conversion layer and the protective layer among the components of the donor film. It is flexible by configuring it to include, and by providing thermal expansion characteristics, it provides more optimized physical properties when transferring by laser light thermal transfer method, and is also process-stable, energy-efficient, and excellent in transfer quality. It is intended to provide.

Another object of the present invention is to provide a variety of devices used in the field of flat panel display using a donor film for thermal transfer of laser light having the above excellent properties.

The present invention can also aim to achieve other objects that can be easily derived by those skilled in the art from the general description of the present specification in addition to the above-described clear object. In addition, it is possible to provide a donor film for laser light thermal transfer, which shows improved energy efficiency, enlarged transfer window, and excellent transfer surface quality due to high pattern resolution and transmission sensitivity, small image defects, and transfer ability at low laser power. The specific object of the present invention could be achieved.

The present invention is also to provide a manufacturing method for manufacturing a donor film for laser light thermal transfer having the characteristics as described above.

The donor film for transfer of laser light having excellent transfer characteristics according to the present invention comprises a base layer, a photothermal conversion layer, a protective layer, and a transfer layer, wherein either or both of the photothermal conversion layer and the protective layer are thermally expanded. It comprises a resin, wherein the thermally expandable resin is formed by coating the resin-forming composition and subsequent polymerization.

It is preferable that the resin-forming composition contains 10 to 35% by weight of polybutadiene diacrylate as a resin component, 1 to 10% by weight of a crosslinking agent, 1 to 5% by weight of an initiator, and an organic solvent as a residual amount.

The resin component is preferably a mixture of the polybutadiene diacrylate and a second resin, and the second resin is an acrylonitrile-butadiene copolymer, a styrene-butadiene copolymer (Styrene-Butadiene copolymer), SEBS copolymer (Styrene-Ethylene-Butadiene-Styrene Block Copolymer), nitrile rubber (Nitrile Rubber), polystyrene-butadiene copolymer (Poly (Strene-co-Butadiene) copolymer), selected from the group consisting of acrylic rubber (Acryl Rubber) It is preferable that it is one or more . As the crosslinking agent, a crosslinking agent having an acrylate group having two or more functional groups is preferable.

The initiator is preferably an initiator selected from the group consisting of alpha-hydroxyketone, alpha-aminoketone, or mixtures thereof.

The organic solvent is preferably an organic solvent selected from the group consisting of methyl ethyl ketone, toluene, xylene and mixtures of two or more of them.

It is preferable that the resin-forming composition further includes a light absorbing material for forming a photothermal conversion layer.

Carbon black is preferable as the light absorbing material.

The photothermal conversion layer and the protective layer are preferably formed to a thickness within the range of 1 to 3 μm, respectively.

In addition, the method for manufacturing a donor film for thermal transfer of laser light according to the present invention comprises a base layer, a photothermal conversion layer, a protective layer, and a transfer layer, but any one or both layers of the photothermal conversion layer and the protective layer In the manufacturing method of a laser beam thermal transfer donor film comprising a thermally expandable resin,

(1) preparing a base film constituting the base layer;

(2) forming a photothermal conversion layer by coating a resin-forming composition comprising a light absorbing material on the base film and subsequently curing the photothermal conversion layer;

(3) a protective layer forming step of forming a protective layer by coating a resin forming composition on the photothermal conversion layer formed in the photothermal conversion layer forming step and subsequently curing; And

(4) a transfer layer forming step of forming a transfer layer comprising an organic light-emitting material on the protective layer formed in the protective layer forming step;

Including,

Here, any one or both of the resin-forming composition forming the photothermal conversion layer or the resin-forming composition forming the protective layer is 10 to 35% by weight of polybutadiene diacrylate, 1 to 10% by weight of crosslinking agent, 1 to 5 of initiator It is a resin-forming composition for forming a thermally expandable resin comprising an organic solvent as a weight percent and a residual amount.

According to the present invention, a base layer, a photothermal conversion layer, a protective layer and a transfer layer are formed, but any one or both layers of the photothermal conversion layer and the protective layer are thermally expandable resins, particularly polybutadiene die as a binder resin. Provides a donor film for thermal transfer of laser light, which has excellent transfer characteristics, including acrylate, whereby the photothermal conversion layer and the protective layer have excellent expansion during laser transfer, resulting in high pattern resolution and transmission sensitivity, small image defects, and low laser. It provides the effect of providing a donor film for thermal transfer of laser light, which shows an improvement in energy efficiency, expansion of a transfer window, and excellent transfer surface quality due to transfer ability at the output.

1 is a cross-sectional view schematically showing a donor film for thermal transfer of laser light according to the present invention.
2 is a photograph showing a comparison between the donor film according to Example 1 according to the present invention and the laser simulation transfer pictures using the donor film according to Comparative Example 1 as a control .
3 is a view schematically showing a transfer process according to a laser beam thermal transfer method using a donor film for laser beam thermal transfer.
4 is a plan view of a test plate with a pattern for measuring the thermal transfer performance of a donor film for thermal transfer of laser light.

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

FIG. 1 schematically shows the structure of a donor film for thermal transfer of laser light. That is, the donor film for thermal transfer of laser light having excellent transfer characteristics according to the present invention comprises a base layer, a photothermal conversion layer, a protective layer, and a transfer layer, but any one or both layers of the photothermal conversion layer and the protective layer Is made of a heat-expandable resin, wherein the heat-expandable resin is formed by coating the resin-forming composition and subsequent polymerization.

The base layer 1 and the transfer layers 4 may be understood to be the same or similar to the base layer 1 and the transfer layer 4 of the conventional donor film, respectively.

The base layer 1 serves as a mechanical support in the lowest layer of the components of the donor film, and generally the substrate may be a glass, a transparent film or a polymer film. One of the suitable types of polymer films is a polymer having a high transmittance, such as a polyester film, for example, polyethylene terephthalate (PET) or polyethylene naphthalate (PEN) film, that is, a combat power (550 nm light source) of 85% or less. It is a film. In order to be used as a donor film base substrate, it must be able to have high transmittance as well as mechanical and thermal properties. This is a typical donor film composed of a polymer film substrate, that is, a base layer (1), a photothermal conversion layer (2), and a protective layer (3). In addition, since it is a region of the photothermal conversion layer 2, it is confirmed under necessary conditions. In addition, it should be possible to have a primer layer (not shown) that can adjust the adhesion at the interface between the base layer 1 and the photothermal conversion layer 2 according to the organic binder resin used in the photothermal conversion layer 2. Typically, the material used to form the donor film and any adjacent layer improves adhesion between the donor film and the adjacent layer, controls the temperature transfer between the base layer 1 and the adjacent layer, and the photothermal conversion layer. It can be selected to control the transmission of light for image formation to (2). As the base layer 1, polyethylene terephthalate (PET) having a thickness of 75 to 100 μm is preferable . When the thickness of the base layer 1 is less than 75 µm, there may be a problem that it does not sufficiently serve as a support layer. Conversely, when it exceeds 100 µm, the price increases and the thin film is transferred during laser light transfer. Therefore, there may be a problem of inhibiting efficiency by acting as a factor that interferes with heat transfer. XU series / XG series (Toray Advanced Materials, Gumi, Gyeongsangbuk-do, Korea) Korea Inc.)).

The transfer layer 4 is coated with a uniform layer by, for example, thermal deposition, sputtering or solvent coating, or spin coating, or digital printing. (For example, digital inkjet or digital electrophotographic printing), lithography (lithography) printing or printing in a pattern using deposition or sputtering through a mask, is generally formed by placing on the photothermal conversion layer (2). As previously indicated, other optional layers, for example, a protective layer 3, may be interposed between the optional photothermal conversion layer 2 and the transfer layer 4. The transfer layer 4 typically includes one or more layers for transfer to an acceptor. These layers can be formed using organic, inorganic, organometallic and other materials, including, for example, electroluminescent materials or electrically active materials.

The present invention has a soft property at room temperature when forming the photothermal conversion layer 2 and / or the protective layer 3 on the base layer 1, and has a low temperature at which the glass transition temperature (Tg) is low. It is characterized by the fact that transfer can be started in the region, and is configured to include a thermally expandable resin having excellent thermal expansion. This thermally expandable resin is characterized by being formed by coating the resin-forming composition and subsequent polymerization.

That is, it is preferable that the resin-forming composition comprises 10 to 35% by weight of polybutadiene diacrylate as a resin component, 1 to 10% by weight of a crosslinking agent, 1 to 5% by weight of an initiator, and an organic solvent as a residual amount. When the amount of the polybutadiene diacrylate used as the resin component is less than 10% by weight, there may be a problem in that the transfer properties are poor due to poor expansion during laser transfer. Conversely, when it exceeds 35% by weight, coating defects such as pinholes There may be problems such as appearance defects.

In particular, in order to enhance the thermoforming of the coating layer, the resin component is preferably a mixture of the polybutadiene diacrylate and the second resin, and the second resin is an acrylonitrile-butadiene copolymer, Styrene-Butadiene copolymer, SEBS copolymer (Styrene-Ethylene-Butadiene-Styrene Block Copolymer), Nitrile Rubber, Polystyrene-Butadiene copolymer (Poly (Strene-co-Butadiene) copolymer) , It is preferably at least one selected from the group consisting of acrylic rubber (Acryl Rubber).

The cross-linking agent is preferably a cross-linking agent having an acrylate group having two or more functional groups, wherein the cross-linking agent is used to increase the cross-linking density of the resin component, and through cross-linking by using the cross-linking agent 3 You can form a dimensional network. Hexane Diol Diacrylate (HDODA), Propoxylated Neopentyl Glycol Diacrylate (TRPGDA), Polyethylene Glycol Diacrylate (PEGDA), etc. can be used. You can. When the amount of the crosslinking agent is less than 1% by weight, there may be a problem that the curing density is low during UV curing, and, conversely, when it exceeds 10% by weight, there may be a problem that the transfer width, which is a transfer characteristic during laser transfer, is reduced. .

The initiator is preferably an initiator selected from the group consisting of alpha-hydroxyketone, alpha-aminoketone, or mixtures thereof. In addition, an initiator having a maximum absorption wavelength of 170 to 300nm wavelength corresponding to a short wavelength region may be used. have. When the amount of the initiator used is less than 1% by weight, there may be a problem that curing does not occur when UV curing, on the contrary, when it exceeds 5% by weight, problems such as appearance defects such as coating defects due to air bubbles when preparing and coating the crude liquid and There may be a possibility of a later problem caused by an unreacted initiator that does not participate in the reaction.

The organic solvent is preferably an organic solvent selected from the group consisting of methyl ethyl ketone, toluene, xylene, and mixtures of two or more of them. The resin-forming composition may further include a light absorbing material for forming the photothermal conversion layer (2). Carbon black is preferable as the light absorbing material.

The photothermal conversion layer 2 and the protective layer 3 are preferably formed to a thickness within the range of 1 to 3 μm, respectively. When the thickness of the photothermal conversion layer 2 is less than 1 μm, the heat generation effect due to absorption of the laser light may not be sufficient, and thus there may be a problem that the heat transfer of the laser light is insufficient. When transferring, there may be a problem that damage is caused to the transfer layer 4 due to excessive heat transfer.

When the thickness of the protective layer 3 is less than 1 μm, there may be a problem that damages the transfer layer due to excessive heat transfer during laser transfer, and conversely, when it exceeds 3 μm, the transfer layer 4 is By interfering with the required heat transfer, there may be a problem that transfer is not made or is incomplete.

To form the photothermal conversion layer 2 and the protective layer 3 from the resin-forming composition, a nip coater, bar coater, gravure coating or slot die known in the art (Slot die) coating method can be used.

In addition, the method for manufacturing a donor film for thermal transfer of laser light according to the present invention comprises a base layer, a photothermal conversion layer, a protective layer, and a transfer layer, but any one or both layers of the photothermal conversion layer and the protective layer In the manufacturing method of a laser beam thermal transfer donor film comprising a thermally expandable resin,

(1) preparing a base film constituting the base layer;

(2) forming a photothermal conversion layer by coating a resin-forming composition comprising a light absorbing material on the base film and subsequently curing the photothermal conversion layer;

(3) a protective layer forming step of forming a protective layer by coating a resin forming composition on the photothermal conversion layer formed in the photothermal conversion layer forming step and subsequently curing; And

(4) a transfer layer forming step of forming a transfer layer comprising an organic light-emitting material on the protective layer formed in the protective layer forming step;

Including,

Here, any one or both of the resin-forming composition forming the photothermal conversion layer or the resin-forming composition forming the protective layer is 10 to 35% by weight of polybutadiene diacrylate, 1 to 10% by weight of crosslinking agent, 1 to 5 of initiator It is a resin-forming composition for forming a thermally expandable resin comprising an organic solvent as a weight percent and a residual amount.

The base film forming the base layer is the same or similar as described above, and it is preferable that polyethylene terephthalate (PET) having a thickness of 75 to 100 μm is used.

In the present invention, in the formation of the photothermal conversion layer and the protective layer, a photothermal conversion layer is formed by coating a resin-forming composition comprising a light absorbing material on the base film and subsequently curing, and in the step of forming the photothermal conversion layer. It consists of forming a protective layer by coating the resin-forming composition on the formed photothermal conversion layer and subsequently curing it. Thereby, it is possible to form the photothermal conversion layer and the protective layer according to the present invention having soft thermal expansion properties. Here, it can be understood by those skilled in the art that coating and curing can be performed by a coating method and a curing method known to those skilled in the art, and a coating method used in the production of conventional donor films. And the same or similar methods to the curing method can be used.

Hereinafter, the present invention will be described in more detail through examples and comparative examples of the present invention.

[Example 1]

On a surface of a transparent polyester film (XU42, 100 μm of Toray Advanced Materials Co., Ltd.), a coating solution having the composition of Table 1 (photothermal conversion layer coating solution) and Table 2 (protective layer coating solution) was applied using a bar coater, It was dried at 100 ° C for 1 minute, and irradiated with an amount of 300 to 500 mJ / cm 2 in an UV lamp to form a photothermal conversion layer and a protective layer. Here, in the case of the photothermal conversion layer, a metal halide lamp was used for the ultraviolet lamp, and a mercury lamp was used for the protective layer.

Ingredient name Content (% by weight) Polybutadiene diacrylate
(Sartomer manufactured by CN303) 15.9 Crosslinking agent (PEGDA)
(Sartomer SR344) 5.0 Carbon black dispersion
(Cabot Corporation product TPX3301) 12.0 Initiator
(Irgacure, Irgacure819) 2.1 Methyl ethyl ketone 32.5 toluene 32.5

Ingredient name Content (% by weight) Polybutadiene diacrylate
(Santomer Co., Ltd. CN303) 26.8 Crosslinking agent (HDODA)
(Sartomer Corporation SR238) 5.0 Initiator
(Irgacure184 from Irgacure) 3.0 Methyl ethyl ketone 32.6 xylene 32.6

[Example 2]

It was performed in the same manner as in Example 1, except that the coating liquid of Table 3 (protective layer coating liquid) was used instead of the coating liquid of Table 2 (protective layer coating liquid).

Ingredient name Content (% by weight) Epoxy acrylate
(Sartomer Corporation CN120) 26.8 Crosslinking agent (HDODA)
(Sartomer Corporation SR238) 5.0 Initiator
(Irgacure184 from Irgacure) 3.0 Methyl ethyl ketone 32.6 xylene 32.6

[Example 3]

It was carried out in the same manner as in Example 1, except that the coating solution of Table 4 (photothermal conversion layer coating solution) was used instead of the coating solution of Table 1 (photothermal conversion layer coating solution).

Ingredient name Content (% by weight) Epoxy acrylate
(Sartomer Corporation CN120) 15.9 Crosslinking agent (PEGDA)
(Sartomer SR344) 5.0 Carbon black dispersion
(TPX3301 manufactured by Carvote) 12.0 Initiator
(Irgacure819, Irgacure819) 2.1 Methyl ethyl ketone 32.5 toluene 32.5

[Example 4]

It was carried out in the same manner as in Example 1, except that the coating solution of Table 5 (photothermal conversion layer coating solution) was used instead of the coating solution of Table 1 (photothermal conversion layer coating solution).

Ingredient name Content (% by weight) Polybutadiene diacrylate
(Santomer Co., Ltd. CN303) 7.95 SEBS copolymer
(Kumho Petrochemical K9152) 7.95 Crosslinking agent (PEGDA)
(Sartomer SR344) 5.0 Carbon black dispersion
(TPX3301 manufactured by Carvote) 12.0 Initiator
(Irgacure819, Irgacure819) 2.1 Methyl ethyl ketone 32.5 toluene 32.5

[Comparative Example 1]

The coating liquid of Table 4 (photothermal conversion layer coating liquid) instead of the coating liquid of Table 1 (photothermal conversion layer coating liquid), and the coating liquid of Table 3 (protective layer coating liquid) instead of the coating liquid of Table 2 (protective layer coating liquid) It was carried out in the same manner as in Example 1 except for using the coating liquid of.

[Comparative Example 2]

The coating solution of Table 6 (photothermal conversion layer coating solution) instead of the coating solution of Table 1 (photothermal conversion layer coating solution), and the coating solution of Table 7 (protective layer coating solution) above instead of the coating solution of Table 2 (protective layer coating solution) It was carried out in the same manner as in Example 1 except for using the coating liquid of.

Ingredient name Content (% by weight) Urethane acrylate
(Cartoon, manufactured by Sartomer Inc.) 15.9 Crosslinking agent (PEGDA)
(Sartomer SR344) 5.0 Carbon black dispersion
(TPX3301 manufactured by Carvote) 12.0 Initiator
(Irgacure819, Irgacure819) 2.1 Methyl ethyl ketone 32.5 toluene 32.5

Ingredient name Content (% by weight) Urethane acrylate
(Cartoon, manufactured by Sartomer Inc.) 26.8 Crosslinking agent (HDODA)
(Sartomer Corporation SR238) 5.0 Initiator
(Irgacure184 from Irgacure) 3.0 Methyl ethyl ketone 32.6 xylene 32.6

[Comparative Example 3]

Instead of the coating solution of Table 1 (photothermal conversion layer coating solution), the coating solution of Table 8 (photothermal conversion layer coating solution), and instead of the coating solution of Table 2 (protective layer coating solution), Table 9 (protective layer coating solution) It was carried out in the same manner as in Example 1 except for using the coating liquid of.

Ingredient name Content (% by weight) Polybutadiene diacrylate
(Santomer Co., Ltd. CN303) 2.3 Crosslinking agent (PEGDA)
(Sartomer SR344) 18.6 Carbon black dispersion
(TPX3301 manufactured by Carvote) 12.0 Initiator
(Irgacure819, Irgacure819) 2.1 Methyl ethyl ketone 32.5 toluene 32.5

Ingredient name Content (% by weight) Polybutadiene diacrylate
(Santomer Co., Ltd. CN303) 3.2 Crosslinking agent (HDODA)
(Sartomer Corporation SR238) 28.6 Initiator
(Irgacure184 from Irgacure) 3.0 Methyl ethyl ketone 32.6 xylene 32.6

*Test Methods

1. Transcription characteristic test

Using the donor films prepared in Examples 1 to 4 and Comparative Examples 1 to 3, the organic fluorescent material (Alq3) to a thickness of 200 nm, and a hole transport layer (HTL; DNTPD) material of 300 Deposition was performed to a thickness of ㎚, and the transfer test was performed in the order shown in FIG. 3 using LITI equipment on the donor film after the deposition was completed, and the transfer conditions are as follows. In FIG. 3, step S1 is a step of preparing an acceptor substrate, and a substrate to which the organic fluorescent material is transferred by a donor film is prepared. Step S2 is a step of preparing a donor film, a photothermal conversion layer comprising donor films according to the prior art of comparative examples and a heat-expandable resin that is flexible and has thermal expansion properties in a photothermal conversion layer and / or a protective layer according to the present invention. And / or donor films comprising a protective layer. Step S3 is a substrate film lamination step, wherein the substrate means the upper acceptor substrate, and the film means the upper donor film, and these are stacked on top of each other, with the transfer layer of the donor film facing toward the acceptor substrate. . Step S4 is a transfer step, by irradiating laser light toward the base layer of the donor film to convert the laser light into heat in the photothermal conversion layer, so that the organic light-emitting material is transferred from the transfer layer toward the upper acceptor substrate. Step S5 is a peeling step, and after the transfer is completed, the donor film is separated from the above acceptor substrate. Subsequently, an inspection step (step S6) is performed to check whether the transfer was successful or not, and whether it was defective.

-Laser transfer test conditions

1) Type of laser light source: Fiber laser

2) Infrared laser wavelength: 1064nm

3) Laser transfer power range: 1,0 to 6.0A (initial 1.0A split / 0.2A split)

4) OLED deposition material: Alq3 (green phosphor), DNTPD (hole transport layer material)

5) Deposition thickness and speed: 2000Å = 1.0Å / sec, 3000Å = 1.0Å / sec

6) Laser line width: about 72㎛

In the above, Alq3 is Tris (8-hydroxy-quinolinato) aluminum (Tris (8-hydroxy-quinolinato)), and DNTPD is N ¹ , N ^1- (biphenyl-4,4'-diyl ) Bis (N ¹ -phenyl-N ⁴ , N ⁴ -di-m-tolylbenzene-1,4-diamine (N ¹ , N ^1- (biphenyl-4,4'-diyl) bis (N ¹ -phenyl- N ⁴ , N ⁴ -di-m-tolylbenzene-1,4-diamine; CAS No. 199121-98-7).

2. Analysis of transcription characteristics

As shown in Examples 1 to 3 and Comparative Examples 1 to 3, the analysis after the laser transfer test was performed using the 3D surface shape equipment (VK-97 manufactured by Keyence, Korea), and the transfer width and expansion on the basis of the substrate side (transferred side). Height, transfer range, transfer surface quality, etc. were analyzed, and the results are shown in Table 10 below (average of 9 points).

Transfer width (㎛) Transfer range (A) Expansion height (㎛) Transfer surface quality Example 1 69 2.8 ~ 6.0 16 Good Example 2 63 3.4 ~ 5.6 11 Good Example 3 66 3.2 ~ 5.8 13 Good Example 4 67 3.0 ~ 6.0 15 Good Comparative Example 1 53 4.4 ~ 5.2 6 Bad Comparative Example 2 56 4.2 ~ 5.6 8 Bad Comparative Example 3 55 4.3 ~ 5.5 8 Bad

As shown in Table 9, the donor films prepared in Examples 1 to 4 are superior in terms of transfer width, transfer range, expansion height, and transfer surface quality compared to the donor films prepared in Comparative Examples 1 to 3. I could confirm.

Looking in detail, it can be seen that in Comparative Examples 1 and 2 having different compositions from Examples 1 to 4, the transfer characteristics and the quality of the transfer surface are deteriorated, and in Comparative Example 3, polybutadiene diacrylate As a case in which the content of was prepared at less than 10% (9%) compared to the solid content, as a case where the surface was designed rather than a flexible feeling, it was confirmed that the transfer characteristics and the expansion height were lower than those of the examples.

These examples are only provided by way of example to illustrate the present invention in more detail, that the scope of the present invention is not limited by these examples, those skilled in the art, various modifications therefrom And it will be understood that other equivalent embodiments are possible. Therefore, the true technical protection scope of the present invention should be determined by the technical spirit of the attached patent scope.

The present invention can be used in the industry of manufacturing donor films for the manufacture of optical devices such as organic light emitting devices, which is a kind of flat panel display, and in the industry of manufacturing optical devices using the same.

DESCRIPTION OF SYMBOLS 1 Base layer 2 Photothermal conversion layer
3: protective layer 4: transfer layer
S1: acceptor substrate preparation step S2: donor film preparation step
S3: Substrate film lamination step S4: Transfer step
S5: Peeling step S6: Inspection step

Claims (10)

It comprises a base layer, a photothermal conversion layer, a protective layer and a transfer layer, but any one or both layers of the photothermal conversion layer and the protective layer are made of a thermally expandable resin, wherein the thermally expandable resin It is formed by coating the resin-forming composition and subsequent polymerization.
The resin-forming composition comprises 10 to 35% by weight of polybutadiene diacrylate as a resin component, 1 to 10% by weight of a crosslinking agent, 1 to 5% by weight of an initiator, and an organic solvent as a residual amount,
The crosslinking agent is in the group consisting of Hexane Diol Diacrylate (HDODA), Propoxylated Neopentyl Glycol Diacrylate (TRPGDA), Polyethylene Glycol Diacrylate (PEGDA). A donor film for thermal transfer of laser light with excellent transfer characteristics, characterized in that it is at least one selected. delete According to claim 1,
The resin component is preferably a mixture of the polybutadiene diacrylate and the second resin, and the second resin is an acrylonitrile-butadiene copolymer, styrene-butadiene copolymer (Styrene-Butadiene copolymer), SEBS copolymer (Styrene-Ethylene-Butadiene-Styrene Block Copolymer), nitrile rubber (Nitrile Rubber), polystyrene-butadiene copolymer (Poly (Strene-co-Butadiene) copolymer), selected from the group consisting of acrylic rubber (Acryl Rubber) A donor film for thermal transfer of laser light, which is characterized by one or more types. delete According to claim 1,
A laser donor film having excellent transfer properties, characterized in that the initiator is an initiator selected from the group consisting of alpha-hydroxyketone, alpha-aminoketone, or mixtures thereof. According to claim 1,
A donor film for laser light thermal transfer with excellent transfer characteristics, wherein the organic solvent is an organic solvent selected from the group consisting of methyl ethyl ketone, toluene, xylene and a mixture of two or more of them. According to claim 1,
The resin-forming composition further comprises a light absorbing material for the formation of a photothermal conversion layer, a laser light thermal transfer donor film having excellent transfer characteristics. The method of claim 7,
A donor film for thermal transfer of laser light, which is characterized in that the light absorbing material is carbon black. According to claim 1,
The photothermal conversion layer and the protective layer are each formed with a thickness within the range of 1 to 3㎛, the donor film for laser light transfer excellent in transfer characteristics. A method of manufacturing a donor film for laser light thermal transfer made of a base layer, a photothermal conversion layer, a protective layer, and a transfer layer, wherein any one or both layers of the photothermal conversion layer and the protective layer contain a thermally expandable resin. In,
(1) preparing a base film constituting the base layer;
(2) forming a photothermal conversion layer by coating a resin-forming composition comprising a light absorbing material on the base film and subsequently curing the photothermal conversion layer;
(3) a protective layer forming step of forming a protective layer by coating a resin forming composition on the photothermal conversion layer formed in the photothermal conversion layer forming step and subsequently curing; And
(4) a transfer layer forming step of forming a transfer layer comprising an organic light-emitting material on the protective layer formed in the protective layer forming step;
Including,
Here, any one or both of the resin-forming composition forming the photothermal conversion layer or the resin-forming composition forming the protective layer is 10 to 35% by weight of polybutadiene diacrylate, 1 to 10% by weight of crosslinking agent, 1 to 5 of initiator It is a resin-forming composition for forming a thermally expandable resin comprising an organic solvent as a weight percent and a residual amount,
The crosslinking agent is in the group consisting of Hexane Diol Diacrylate (HDODA), Propoxylated Neopentyl Glycol Diacrylate (TRPGDA), Polyethylene Glycol Diacrylate (PEGDA). Method of manufacturing a donor film for thermal transfer of laser light, characterized in that at least one selected.

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