KR20190103691A - Laser induced thermal transfer film - Google Patents

Abstract

The present invention relates to a laser thermal transfer film. According to the present invention, in the laser thermal transfer film, a photo-thermal conversion layer including a binder, a light absorbent, and foam particles is formed on a base film, and the photo-thermal conversion layer has adhesive property. In order to improve transfer property of the laser thermal transfer film, the adhesion between the laser thermal transfer film and a receiver film used as a donor film should be adjusted. To this end, by expanding the foam particles in an area irradiated by the laser including the foam particles of the photo-thermal conversion layer, deformation occurs on the surface of the photo-thermal conversion layer, and the deformation reduces a ground contact area between the surface of the photo-thermal conversion layer and a transfer member, thereby lowering the adhesive force, thereby transferring the transfer member to a desired position of the receiver film.

Description

Laser Thermal Transfer Film {LASER INDUCED THERMAL TRANSFER FILM}

The present invention relates to a laser thermal transfer film, and more particularly, a light-to-heat conversion layer including a light absorbing agent, foamed particles and a binder is formed on a base film, and the expanded particles are expanded to ground the light-heat conversion layer and the transfer body. The present invention relates to a laser thermal transfer film having improved transfer characteristics by reducing a plane to reduce adhesion to a transfer body.

Carbon black, dyes, pigments, metal materials and the like are used as the light absorbing agent for photothermal conversion used in the laser thermal transfer film. Among these dyes have a maximum absorbance peak in the near-infrared region of 780-1500 nm, a typical laser wavelength range used for laser thermal transfer, but relatively low absorbance in the visible region below 700 nm. The advantage is the wide choice of materials.

For example, Patent Document 1 discloses Prussian Blue (or Pigment Blue 27), copper phthalocyanine (Pigment Blue 15), metal dithiene, as an image forming radiation absorber material suitable for use in an 808 nm laser. And polymethine dyes, cyanine dyes and the like.

On the other hand, Patent Document 2 is a dye that can be applied to the photothermal conversion layer having a maximum absorbance of the photothermal conversion layer at a wavelength of 650 ~ 1200nm 3 times larger than the maximum absorbance of the photothermal conversion layer at a wavelength of 400 ~ 650nm, Dyes of the indolium salts or benz [e] indolium salts series are disclosed.

<Patent Document 2, Examples of benzoindolium salts>

Patent Document 3 discloses a metal complex compound of a phthalocyanine-based compound as a light absorber for laser thermal transfer.

<Patent Document 3, Phthalocyanine to Metal Complex Compound>

However, when the dyes are used, the transmittance in the visible region is insufficient, so that there is a difficulty in quality inspection of the manufactured transfer film, alignment with the receiver element, and the like. A receiver to which the transfer member is transferred by the laser thermal transfer film is If the adhesive properties have a difficulty in transferring the transfer member to the desired position or pattern.

Accordingly, the inventors of the present invention have been made to provide a laser thermal transfer film that can be selectively transferred by making the laser thermal transfer film have an adhesive property to facilitate adhesion with the initial laser and to reduce the adhesive force upon laser irradiation.

Republic of Korea Patent Publication No. 2009-0034364 Republic of Korea Patent Publication No. 2007 ~ 0067725 U.S. Patent 6,066,729

An object of the present invention is to provide a high optical density to the near infrared wavelength, high light transmittance in the visible light region, and to enable the transfer member to be selectively transferred to the receiver film through a decrease in the adhesive strength of the photothermal conversion layer attached to the transfer member after laser irradiation. It is to provide a laser thermal transfer film.

Laser thermal transfer film of the present invention

Base film;

On the base film is formed a light-to-heat conversion layer comprising a light absorbing agent of the following formula (1), foam particles and a binder,

The adhesive force of the photothermal conversion layer is 5 to 1000 gf / inch.

The light absorbing agent has a lowest transmittance in the wavelength region of 780 to 1500 nm.

The content of the foam particles is characterized in that 0.1 to 30 parts by weight relative to 100 parts by weight of the binder.

The glass transition temperature of the binder is characterized in that -70 ° C to 10 ° C.

The binder may be selected from the group consisting of polyacrylates, polymethacrylates, epoxies, polystyrenes, polyurethanes, polysulfones, polyesters, polyimides, polysilicones, polyvinyl alcohols, polyolefins, and fluorine-based resins, or a combination thereof. It is characterized by that.

The thickness of the photothermal conversion layer is characterized in that 0.1 to 30㎛.

The present invention has a high transmittance in the visible region using a diimnium-based dye that absorbs light in the infrared laser wavelength region as a material of the light-to-heat conversion layer. Provided is a laser thermal transfer film that is easy to align with a receiver film.

In addition, when the expanded particles are expanded by including the foamed particles in the light-heat conversion layer, deformation occurs on the surface of the light-heat conversion layer. As a result, the ground plane of the surface of the light-heat conversion layer and the transfer member decreases and the adhesive force is reduced, and thus the desired position of the receiver film is reduced. It is possible to transfer the transcript.

BRIEF DESCRIPTION OF THE DRAWINGS It is typical sectional drawing of the laser thermal transfer film of this invention.

Hereinafter, the laser thermal transfer film of the present invention will be described in detail with reference to the accompanying drawings.

1 is a schematic cross-sectional view of the laser thermal transfer film 10 of the present invention. Laser thermal transfer film 10 of the present invention is a light-heat conversion layer 12 is laminated on the base film 11, the light-heat conversion layer 12 includes a light absorbing agent and foam particles as a single coating layer.

1. Base Film (11)

The base film 11 may be formed of other layers having functionality in a series of processes for removing the thermal transfer film from the receiver film after manufacturing the thermal transfer film, laminating with the receiver film, and transferring, for example, the laser thermoelectric of the present invention. It serves as a substrate for supporting the photothermal conversion layer 12, which is another layer structure of the yarn film, and the transfer member or the like attached on the photothermal conversion layer 12.

The base film 11 may be a high polymer film. Suitable types of polymeric polymer films consist of polyethylene terephthalate, polyethylene naphthalate, polyarylate, polycarbonate, polyetherimide, polyimide, polyestersulfonate, polysulfonate, polyacrylic, polyepoxy, polystyrene, polyacetate It is characterized in that any one selected from the group. However, other films may be used that have sufficient mechanical and thermal stability for certain applications, and optionally sufficient optical properties, including high transmittance of light of a particular wavelength.

The base film 11 has a thickness of 5 to 500 µm, and the polymer polymer film used for the base film may be primer-treated, roughened (roughness) for the purpose of improving the adhesiveness with another structure, specifically, the photothermal conversion layer. It may be stretched or heat treated for water stability, water repellent treatment, or contain a small amount of fine particles or fillers for controlling light permeability. Additionally, substrate substrates disclosed in Korean Patent Application Publication Nos. 2007-0067725, 2007-0049003, and 2004-0101053 may be referred to for the substrate film applied to the photothermal conversion layer of the present invention.

2. Photothermal conversion layer (12)

The photothermal conversion layer 12 absorbs light (lasers) by one or more light absorbing agents included in the photothermal conversion layer 12 while transferring the transfer member to the receiver film using the laser thermal transfer film 10. Conversion to heat provides power to transfer the transfer body to the receiver film. The power may be heat itself or may be a physical force due to thermal expansion of some layers.

Typically, the light absorbing agent of the photothermal conversion layer 12 absorbs light in the infrared, visible and / or ultraviolet regions of the electromagnetic spectrum and converts the absorbed light into heat. The light absorber may be one that absorbs light in a wavelength region or a specific wavelength used for transcription, but absorbs much less for another wavelength region or a specific wavelength (it may be transparent or reflective).

The photothermal conversion layer is usually made as thin as possible in terms of local absorption of heat, which is advantageous for transfer, and a thickness of 0.1 to 30 mu m is usually used. If the thickness of the photothermal conversion layer is out of the above range, even if irradiated with the laser does not occur enough energy transfer to the surface of the photothermal conversion layer. Therefore, surface deformation due to expansion of the foam particles is difficult, and since the ground plane with the transfer member does not decrease, there is a problem that the selective transfer of the transfer member becomes difficult because the adhesive force does not decrease after laser irradiation.

As the light absorbing agent applied to the photothermal conversion layer 12 of the transparent laser thermal transfer film 10 of the present invention, organic dyes or inorganic particles having a maximum absorption wavelength of 780 to 1500 nm may be used. As an organic dye having a maximum absorption wavelength in the wavelength range, a diimmonium salts-based dye represented by the following chemical formula is preferably used.

[Formula 1]

Where

n is 1 or 2;

R ₁ to R ₈ are each independently C1-C10 substituted or unsubstituted linear branched alkyl, and when R ₁ to R ₈ are substituted, the substituents are cyano, nitro, carboxyl, sulfone, halogen, and hydroxide. Hydroxyl, C1-C8 alkoxy, alkoxyalkoxy, acyloxy or alkylamino;

X is a fluoroalkyl phosphate anion represented by the following formula (2):

[Formula 2]

Wherein X is 0 or 1; Y is 1, 2 or 3; Z is 6-y; R9 to R13 are each independently hydrogen or fluorine.

In the present invention, when a 100 μm polyethylene terephthalate (PET) film is used as the base film 11, the visible light transmittance of the biaxially stretched PET film is about 90%. In the case of using the light absorbing agent of Chemical Formula 1 in the base film, it was confirmed that a laser thermal transfer film having a visible light transmittance of 60% or more was maintained while maintaining transfer performance.

In theory, the visible light transmittance is inversely proportional to the concentration of the light absorbing agent used in the photothermal conversion layer. As a non-limiting intention, the diimnium salt-based organic dye used as the light absorbing agent in the present invention is superior to other organic dyes in the near infrared, specifically 780 ~ 1500nm wavelength range, while the absorbance in the visible range is Since it is low, the efficiency of photothermal conversion by near-infrared rays is high, but the transparency in visible region can be maintained high. The use of the dye of the imimonium series provides a laser thermal transfer film having a transmittance of 60% or less in the wavelength region of 780 to 1500 nm.

The diimmonium salt-based dyes described above have excellent solubility in organic solvents. Such solubility in solvents is essential for effective dispersion of the light absorbing agent, and may act as an advantage of reducing the difference in the amount of heat transmitted to the phosphor due to the variation in the generated heat according to the dispersion density due to the dispersion problem in the resin.

The light absorbing agent may be used together with the binder, and the preferred binder should have good compatibility with the light absorbing agent and have high adhesion to the base film. The binder included in the photothermal conversion layer is selected from the group consisting of polyacrylate, polymethacrylate, epoxy, polystyrene, polyurethane, polysulfone, polyester, polyimide, polysilicon, polyvinyl alcohol, polyolefin, and fluorine resin It can be made of a single or a combination of these materials.

The glass transition temperature (T _g ) of the binder is -70 ° C to 10 ° C, and when the glass transition temperature is out of the above range, the adhesive force is too low or too high, and thus all of the selective transfer characteristics are poor, such as transferring to the non-laser portion.

The light absorbing agent, the foamed particles, and the binder of the light-to-heat conversion layer are made of an aqueous or oily coating agent and are laminated by coating on the base film 11. The content of the light absorbing agent is usually in the range of 0.5 to 50 parts by weight, preferably 0.5 to 30 parts by weight, relative to 100 parts by weight of the binder. If the content of the light absorbing agent is less than 0.5 parts by weight, there is a problem in that foaming properties are deteriorated due to insufficient absorption of the energy of the irradiated laser. It is not preferable because it may appear as a defect even in the coating layer.

On the other hand, the photothermal conversion layer may include foam particles. When the expanded particles are included in the photothermal conversion layer, the expanded particles in the portion irradiated with the laser expand and deformation occurs on the surface of the photothermal conversion layer. This reduces the ground plane between the surface of the light-to-heat conversion layer and the transfer member and lowers the adhesive force, thereby making it possible to transfer the transfer member to a desired position of the receiver film.

The expanded particles have a thermoplastic shell (polymer shell) made of a polymer or copolymer obtainable by polymerizing various ethylenically unsaturated monomers, and the monomers are acrylonitrile, methacrylonitrile, alpha-chloroacrylonitrile, Nitrile-containing monomers such as alpha-ethoxyacrylonitrile, fumaronitrile or crotonitrile; Acrylic esters such as methyl acrylate or ethyl acrylate; Methacryl esters such as methyl methacrylate, isobornyl methacrylate or ethyl methacrylate; Vinyl halides such as vinyl chloride; Vinylidene halides such as vinylidene chloride; Vinyl esters such as vinyl acetate; Styrenes such as styrene, halogenated styrenes or alpha-methyl styrene; Dienes such as butadiene, isoprene and chloroprene; Or other types of monomers such as vinyl pyridine, or any mixture of these monomers.

Monomers for polymer shells also include divinyl benzene, ethylene glycol di (meth) acrylate, diethylene glycol di (meth) acrylate, triethylene glycol di (meth) acrylate, propylene glycol di (meth) acrylate, 1, 4-butanediol di (meth) acrylate, 1,6-hexanediol di (meth) acrylate, glycerol di (meth) acrylate, 1,3-butanediol di (meth) acrylate, neopentyl Glycol di (meth) acrylate, 1,10-decanedioldi (meth) acrylate, pentaerythritol tri (meth) acrylate, pentaerythritol tetra (meth) acrylate, pentaerythritol hexa (meth) acrylic Latex, dimethylol tricyclodecane di (meth) acrylate, triallyl formal tri (meth) acrylate, allyl methacrylate, trimethylol propane tri (meth) acrylate, Trimethylol Propane Triacrylate, Tributanediol Di (meth) acrylate, PEG # 200 Di (meth) acrylate, PEG # 400 Di (meth) acrylate, PEG # 600 Di (meth) acrylate, 3- It may often be desirable to include cross-linked polyfunctional monomers such as one or more of acryloyloxyglycol monoacrylate, triacyl formal or triallyl isocyanate, triallyl isocyanurate and the like.

The content of the expanded particles in the composition constituting the photothermal conversion layer is included 0.1 to 30 parts by weight based on 100 parts by weight of the binder. If the content of the expanded particles does not reach 0.1 parts by weight, the ground plane reduction characteristics due to deformation of the expanded particles is lowered, so that the characteristics of transferring the transfer body are reduced, and if the content of the expanded particles exceeds 30 parts by weight, There is a problem because it is difficult to express uniform foaming properties due to poor acidity, and may appear as a defect even in the coating layer.

The blowing agent encapsulated by the polymer shell in the foam particles is usually a liquid having a boiling point not higher than the softening point of the thermoplastic polymer shell. Foaming agents, also called blowing agents or propellants, include n-pentane, isopentane, neopentane, butane, isobutane, hexane, isohexane, neohexane, heptane, isoheptane, octane and isooctane or One or more hydrocarbons, such as any mixture thereof. In addition, other types of hydrocarbons may be used, such as petroleum ethers and chlorinated or fluorinated hydrocarbons such as methyl chloride, methylene chloride, dichloroethane, dichloro ethylene, trichloro ethane, trichloro ethylene, trichlorofluoro methane and the like. . Particularly preferred blowing agents include at least one of isobutane, isopentane, isohexane, cyclohexane, isooctane, isododecane and mixtures thereof. The blowing agent suitably constitutes 5% to 40% by weight of the foamed particles.

The boiling point of the blowing agent at atmospheric pressure may be in a wide range, preferably -20 ° C to 200 ° C, more preferably -20 ° C to 150 ° C, and most preferably -20 ° C to 100 ° C.

The expanded particles are heated and expand due to the heat generated during laser irradiation. The heat generated during the laser irradiation is heat generated by the light absorbing agent included in the light heat conversion layer, and may additionally include heat generated from the binder or the base film included in the light heat conversion layer.

Foam particles heated to heat generated by laser irradiation typically expand two to five times larger than their diameter before expansion. The pre-expansion size of the expanded particles is from 1 μm to 500 μm, more preferably from 5 μm to 100 μm. When the diameter is less than 1 μm, even if the expanded particles are expanded by laser irradiation, the deformation of the film surface is not large. In this case, since the ground plane with the transfer member is not greatly reduced, the decrease in adhesive force is also not large, thus causing a problem that the transfer characteristics are lowered. On the other hand, when the diameter of the expanded particles exceeds 500㎛ the expanded expanded particles are too large, the size of the transfer body is smaller than the expanded expanded particles is difficult to selectively transfer.

The foamed particles may also be premixed with a dispersant which preferably prevents the aggregation of the foamed particles, preferably before expansion. Suitable dispersants are preferably present in the form of fine, usually solid particles having an average diameter of 1 nm to 1 mm, preferably 10 nm to 30 μm. Examples of dispersants include inorganic components such as aluminum powder, magnesium carbonate, magnesium phosphate, magnesium hydroxide, dolomite, calcium carbonate, calcium phosphate, calcium sulfate, talc, kaolin, silicon oxide, iron oxide, Titanium oxide, titanium dioxide, aluminum oxide and hydroxide, zinc oxide, hydrotalcite, mica, baryte, glass spheres, fly ash, fine sand, inorganic Fibers and generally reinforcing fibers, wollastonite, feldspars, diatomaceous earth, pearlite, vermicullite, hollowquartz and ceramic spheres. In addition, organic compounds, in particular polymers with sufficiently high softening points, and cellulose, wood flour, carbon black, carbon fibers and graphite fibers can be used. Preferably, the dispersant is a silicon oxide such as silicon dioxide (silica). Another preferred dispersant is titanium dioxide. Dispersants may be used in pure form or may be surface treated in various ways to increase the effect of preventing aggregates. One of the surface treatment methods of the dispersant is to hydrophobize the surface.

In addition to the photothermal conversion layer coating composition, a crosslinking agent, a moisturizing agent, a surfactant, a pH adjusting agent, a viscosity adjusting agent and a cosolvent may be added.

In addition, the photothermal conversion layer 12 serves to attach the transfer member to the laser thermal transfer film, the adhesive force of the photothermal conversion layer should be designed in consideration of the adhesive force of the receiver film. The adhesive force of the laser thermal transfer film is 5 to 1000 gf / in, preferably 50 to 500 gf / in. When the adhesive force of the laser thermal transfer film is lower than the adhesive force of the receiver film, when the two films are laminated, a problem arises that the transfer member moves to the receiver film side even when the laser is not irradiated, thereby failing to transfer the transfer member to a desired position or pattern. . On the contrary, when the adhesive force of the laser transfer film shows an excessive adhesive force than the receiver film, there is a problem that the transfer does not occur to the receiver side even under the laser irradiation condition.

Suitable materials for use as the transfer body transferred to the receiver film side are well known in the art. The transcript may comprise an organic, inorganic, organometallic or polymeric material. Examples of materials that can be selectively patterned as transcripts include colorants (including pigments and / or dyes dispersed in a binder), polarizers, liquid crystal materials, particles (spacers for liquid crystal displays, magnetic particles, insulating particles, conductive particles) ), Emissive materials (including phosphors and / or organic electroluminescent materials), light-receiving materials that can be incorporated into emissive devices (e.g., electroluminescent devices), for hydrophobic materials (ink jet receptors) Partition banks, hydrophilic materials, multilayer stacks (eg, multilayer device structures such as organic electroluminescent devices), microstructured or nanostructured layers, photoresists, metals, polymers, tackifiers, binders and biomaterials, and Other suitable materials or combinations of materials.

Since there is no particular limitation on the method of applying the above-described photothermal conversion layer, any coating method of a coating process commonly used in the art may be used, and preferably, slodie coating, lip die coating, comma coating, or gravure coating may be used. Methods such as coating and reverse roll coating can be used.

Hereinafter, the configuration and effects of the present invention will be described in more detail with reference to Examples and Comparative Examples. This embodiment is intended to illustrate the present invention in more detail, and the scope of the present invention is not limited to these examples.

<Example 1>

Base material layer: The optical PET film of Toray Advanced Materials Co., Ltd. was used as a base film (thickness 100 micrometers).

Crude solution of the photothermal conversion layer: solid content of diimmonium salt dye A (Kyungin Yang Co., Ltd., NIR1000A), acrylonitrile-based foamed particles (Arczo Nobel, 920DU40), and a thermosetting acrylic resin (Sam paint, SA3000, -30 ° C Tg) A 30 wt% photothermal conversion layer crude solution was prepared.

At this time, the diimmonium salt dye A was 3 parts by weight based on 100 parts by weight of the curable acrylic resin solids, and the acrylonitrile-based foam particles were 2.5 parts by weight based on 100 parts by weight of the curable acrylic resin solids.

Preparation of laser thermal transfer film: A photothermal conversion layer crude solution was coated on a base film using a Comma Coater, and then a photothermal conversion layer coating film was formed after thermal drying to prepare a 12 μm laser thermal transfer film.

<Example 2>

A laser thermal transfer film was manufactured in the same manner as in Example 1, except that the crude liquid of the photothermal conversion layer was prepared such that the content of the diimmonium salt dye A was 6 parts by weight based on 100 parts by weight of the curable acrylic resin solid content.

<Example 3>

A laser thermal transfer film was manufactured in the same manner as in Example 1, except that the crude liquid of the photothermal conversion layer was prepared such that the acrylonitrile-based foam particles were 5 parts by weight based on 100 parts by weight of the curable acrylic resin solid content.

Comparative Example 1

The crude liquid of the photothermal conversion layer was the same as in Example 1 except that a thermosetting acrylic resin (Arakawa, ACS-618, 70 ° C Tg) was applied in place of the thermosetting acrylic resin (Sam Paint, SA3000, -30 ° C Tg). A laser thermal transfer film was prepared.

Comparative Example 2

A laser thermal transfer film was manufactured in the same manner as in Example 1, except that the crude liquid of the photothermal conversion layer was prepared so that the content of the dimonium salt dye A was 0.3 parts by weight based on 100 parts by weight of the curable acrylic resin solid content.

Comparative Example 3

A laser thermal transfer film was manufactured in the same manner as in Example 1, except that the dimonium salt dye A was omitted from the crude liquid of the photothermal conversion layer.

<Comparative Example 4>

A laser thermal transfer film was manufactured in the same manner as in Example 1, except that acrylonitrile-based foam particles were omitted from the crude liquid of the photothermal conversion layer.

Comparative Example 5

A laser thermal transfer film was manufactured in the same manner as in Example 1, except that a 30 μm coating film was formed after thermal drying.

<Transcriptional character evaluation>

Receiver film preparation: The evaluation receiver film used the optical PET film of Toray Advanced Materials Co., Ltd. as a base film (thickness 100 micrometers). An adhesive (Samhwa Paint Co., SA23) was coated and dried using a Comma Coater to prepare a receiver film having an adhesive force of 150 gf / inch.

Twelve transcripts for evaluation obtained by cutting a 20 μm-thick aluminum foil into a size of 2 mm × 2 mm were attached to the laser thermal transfer films prepared in Examples 1 to 3 and Comparative Examples 1 to 5 in the horizontal direction, and then prepared. And the receiver film. When the Nd: YAG 1064nm laser device was applied to the laser thermal transfer film of the laminated film at 10 positions except for the first and the last transfer member of the transfer member, and the two laminated films were peeled off, The transfer characteristics were evaluated by counting the number of transfer bodies for evaluation transferred to the receiver film.

-Number of transfers of the transcript for evaluation of the laser irradiation part: transfer characteristics

(0: lack of transfer characteristics, 5: excellent transfer characteristics)

0: 0

1 ~ 2: 1

3 ~ 4: 2

5 ~ 6: 3

7 ~ 8: 4

9 ~ 10: 5

-Number of transcription of transcript for evaluation of unirradiated portion: selective transfer characteristics

(○: Selective transcription is good, ×: Selective transcription is poor)

0 pieces: ○

1 ~ 2: ×

Experimental Example

1. Light transmittance evaluation

In the Examples 1 to 3 and Comparative Examples 1 to 5, the optical transmittance of the wavelength range of 950 to 1,150 nm including the wavelength of the laser to be irradiated was measured using a UV Spectrophotometer (Shimadzu UV-3600) equipped with an adapter. After measuring the light transmittance of the prepared laser thermal transfer film, the average light transmittance was calculated to evaluate the light transmittance.

2. Evaluation of adhesion

The photothermal conversion layer and the surface of the receiver film of the laser thermal transfer film prepared in Examples 1 to 3 and Comparative Examples 1 to 5 were attached to the SUS surface, laminated at a pressure of 2 kgf / cm, and left for 30 minutes. . The 180 degree peel force on the substrate was measured at a peel rate of 300 mm / min and 25 ° C.

Dye content Foam particles
content Transcription characteristics Light transmittance
(780-1500 nm)
(%) adhesiveness
(gf / inch) laser
Investigation laser
Unexplored Example 1 3 2.5 4 ○ 34 381 Example 2 6 2.5 5 ○ 12 367 Example 3 3 5 5 ○ 35 292 Comparative Example 1 3 2.5 5 × 34 0 Comparative Example 2 0.3 2.5 0 ○ 78 393 Comparative Example 3 0 2.5 0 ○ 89 379 Comparative Example 4 3 0 0 ○ 35 481 Comparative Example 5 3 2.5 One ○ 13 1215

As shown in Table 1, it was confirmed that the transfer characteristics were good after the laser irradiation in Examples 1 to 3, which showed a certain level of adhesion and included a certain level of dye and foamed particles in the photothermal conversion layer.

On the other hand, when the glass transition temperature of the binder is out of the range as in Comparative Example 1, since it does not have adhesive properties, all of the non-laser irradiated parts are transferred to the selective transfer properties, and thus, the dye content is the same as in Comparative Examples 2 to 3. When the low or no dye is included, the degree of conversion of the energy of the laser to thermal energy is reduced, and thus the foaming characteristics of the foamed particles due to heat are low, and thus the transfer characteristics are poor. When foam particles are not included as in Comparative Example 4, the transfer characteristic of the irradiator is poor because there is no main medium for reducing the adhesive force during laser irradiation, and the adhesive force is higher than that of the receiver film even after laser irradiation when the adhesive force is very high as in Comparative Example 5 Since it was high, the transcription | transfer characteristic of the irradiation part was bad.

10 laser thermal transfer film
11 Base Film
12 photothermal conversion layer

Claims (8)

Base film;
On the base film is formed a light-to-heat conversion layer which is a single coating layer comprising a light absorber, foam particles and a binder,
The adhesive force of the light-heat conversion layer is a laser thermal transfer film of 5 to 1000gf / inch. The method of claim 1,
The light absorbing agent is a laser thermal transfer film, characterized in that the organic dye or inorganic particles having the lowest transmittance in the wavelength region of 780 to 1500nm. The method of claim 1,
The light absorbing agent is a laser thermal transfer film, characterized in that the dye of the diimmonium salt (diimmonium salts) series represented by the following formula (1).
[Formula 1]

Where
n is 1 or 2;
R ₁ to R ₈ are each independently C1-C10 substituted or unsubstituted linear branched alkyl, and when R ₁ to R ₈ are substituted, the substituents are cyano, nitro, carboxyl, sulfone, halogen, and hydroxide. Hydroxyl, C1-C8 alkoxy, alkoxyalkoxy, acyloxy or alkylamino;
X is a fluoroalkyl phosphate anion represented by the following formula (2):
[Formula 2]

Wherein X is 0 or 1; Y is 1, 2 or 3; Z is 6-y; R9 to R13 are each independently hydrogen or fluorine. The method of claim 1,
The content of the foam particles is a laser thermal transfer film, characterized in that 0.1 to 30 parts by weight relative to 100 parts by weight of the binder. The method of claim 1,
The glass transition temperature of the binder is a laser thermal transfer film, characterized in that -70 ° C to 10 ° C. The method of claim 1,
The binder may be selected from the group consisting of polyacrylates, polymethacrylates, epoxies, polystyrenes, polyurethanes, polysulfones, polyesters, polyimides, polysilicones, polyvinyl alcohols, polyolefins, and fluorine-based resins, or a combination thereof. Laser thermal transfer film, characterized in that. The method of claim 1,
The thickness of the light-to-heat conversion layer is a laser thermal transfer film, characterized in that 0.1 to 30㎛. The method of claim 1,
The foam particles are laser thermal transfer film, characterized in that the thermoplastic shell made of a polymer or copolymer obtainable by polymerizing an ethylenically unsaturated monomer.

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