UV non-curable laser transfer film

Abstract

A UV-curable laser transfer film is disclosed, comprising: a substrate layer; a thermally expandable light-absorbing layer disposed on the substrate layer; and an adhesive layer disposed on the thermally expandable light-absorbing layer, wherein the thermally expandable light-absorbing layer comprises an adhesive resin and a triazine compound, the adhesive layer comprises an adhesive composition comprising an acrylate monomer containing polar functional groups, an acrylate monomer without polar functional groups, and an acrylate copolymer containing polar functional groups, and the adhesive force of the adhesive layer is greater than or equal to 10 gf / inch.

Description

Technical Field

[0001] This invention relates to an ultraviolet-free laser transfer film. Specifically, it relates to a laser transfer film that is not cured by ultraviolet light. Background Technology

[0002] Currently, a laser transfer method is under development. This method involves processing a substance that reacts to and / or decomposes under laser light onto a glass substrate, attaching a transfer material to it, and then irradiating the glass substrate with laser light from the reverse side of the transfer material to transfer the material. Since continuous processing methods such as roll-to-roll are difficult to apply when using glass substrates, a laser transfer film suitable for substrates with elasticity, including materials such as polymers, is being developed.

[0003] On the other hand, in order to transfer tiny LED chips, semiconductor devices and other transfer materials to the desired location, ultraviolet wavelength lasers can be used, and it is necessary to transfer the laser transfer film without transferring the transfer material at the same time. Summary of the Invention

[0004] Technical issues

[0005] A laser transfer film is provided that exhibits excellent transfer performance even when using a low-power laser, and that structures other than the transfer body are not transferred.

[0006] Technical solution

[0007] According to one aspect, an ultraviolet-curable laser transfer film is provided, comprising: a substrate layer; a thermally expandable light-absorbing layer disposed on the substrate layer; and an adhesive layer disposed on the thermally expandable light-absorbing layer, wherein the thermally expandable light-absorbing layer comprises an adhesive resin and a triazine compound, the adhesive layer comprises an adhesive composition comprising an acrylate monomer containing polar functional groups, an acrylate monomer without polar functional groups, and an acrylate copolymer containing polar functional groups, and the adhesive force of the adhesive layer is greater than or equal to 10 gf / inch.

[0008] According to one embodiment, the triazine compound can be represented by the following chemical formula 1:

[0009] <Chemical Formula 1>

[0010]

[0011] In the chemical formula 1, R1 to R5 are independently hydrogen, hydroxyl, C1-C6, and C5, respectively. 15 Alkyl, C1-C 15 alkoxy or phenyl, R6 is C1-C 15Alkyl groups, groups represented by the following chemical formula ST1, or groups represented by the following chemical formula ST2,

[0012] <Chemical Formula ST1>

[0013]

[0014] <Chemical Formula ST2>

[0015]

[0016] In the chemical formulas ST1 and ST2, R 61 To R 65 They are either hydrogen or C1-C, independent of each other. 15 Alkyl groups, * indicates the binding site with adjacent atoms.

[0017] According to one embodiment, the transmittance of the triazine compound to light with a wavelength of 300 nm to 400 nm can be 2% to 50%. For example, the transmittance of the triazine compound to light with a wavelength of 300 nm to 400 nm can be 2% to 45%, 2% to 40%, 2% to 35%, 2% to 30%, 2% to 25%, 2% to 20%, 2% to 15%, 5% to 45%, 8% to 45%, 10% to 45%, 12% to 45%, 14% to 45%, 15% to 45%, 5% to 40%, 8% to 35%, 10% to 30%, 12% to 25%, or 14% to 20%.

[0018] According to one embodiment, the content of the triazine compound may be from 5 to 20 parts by weight of the total 100 parts by weight of the thermally expandable light-absorbing layer.

[0019] According to one embodiment, the adhesive resin contains reactive functional groups, which may include -OH, -COOH, -NH2, or any combination thereof.

[0020] According to one embodiment, the adhesive resin may include polyester resin, acrylic resin, polyurethane resin, melamine resin, or any combination thereof.

[0021] According to one embodiment, the polar functional group may include hydroxyl, amino, sulfonic acid, or any combination thereof.

[0022] According to one embodiment, the adhesive layer may be a layer formed by thermosetting the adhesive composition.

[0023] According to one embodiment, the acrylate copolymer containing the polar functional groups can be a copolymer of a first compound represented by the following chemical formula 1A and a second compound represented by the following chemical formula 2A:

[0024] <Chemical Formula 1A>

[0025]

[0026] <Chemical Formula 2A>

[0027]

[0028] In the chemical formulas 1A and 2A, R 11 R 12 and R 22 C1-C 20 Alkyl, R 21 It is a C1-C that has been replaced by at least one polar functional group. 20 alkyl.

[0029] According to one embodiment, the content of the acrylate monomer containing polar functional groups and the content of the acrylate copolymer containing polar functional groups can be 10 to 60 parts by weight of each of 100 parts by weight of the adhesive layer.

[0030] According to one embodiment, the thickness of the adhesive layer can be from 1 μm to 10 μm.

[0031] According to one embodiment, the adhesive layer may include a photoinitiator. Attached Figure Description

[0032] Figure 1 This is a schematic diagram illustrating an ultraviolet-curable laser transfer film according to an embodiment of the present invention.

[0033] Figure 2 It is an illustrative representation of the use Figure 1 A diagram illustrating the process of transferring a UV-curable laser transfer film to a transfer body. Detailed Implementation

[0034] Hereinafter, a UV-curable laser transfer film according to an embodiment of the present invention will be described in detail with reference to the accompanying drawings. The following are exemplary, and the invention is not limited thereto; it is defined only by the scope of the claims.

[0035] Unless otherwise defined, all technical and scientific terms used in this specification have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. In case of conflict, the definitions included in this specification shall prevail.

[0036] Similar or equivalent methods and materials to those described in this specification may be used in the implementation or experimentation of this invention, but suitable methods and materials are described in this specification.

[0037] Unless otherwise stated, the terms “comprising” or “containing” in this specification are used to indicate that other constituent elements may be added and / or interposed, but do not exclude other constituent elements.

[0038] In this specification, the term "any combination thereof" is used to refer to two or more mixtures or alloys of the constituent elements described.

[0039] In this specification, the term "~ type resin" is used to represent a broad concept that includes "~ resin" and / or "derivatives of ~ resin".

[0040] In this specification, the term "~class compound" is used to represent a broad concept that includes "~compound" and / or "derivatives of ~compound".

[0041] The term "and / or" in this specification means any and all combinations of one or more of the related listed items described. For example, "A and / or B" is used to indicate the concepts including i) A, ii) B, and iii) A and B.

[0042] Unless otherwise specified, in this specification, the unit "parts by weight" means the weight ratio between each component.

[0043] The values ​​described in this specification are to be understood to include the meaning of "approximately", even if no description is given.

[0044] In this specification, when referring to a component being disposed "on" another component, the component may be directly disposed on the other component, or there may be components sandwiched between the components. Conversely, when referring to a component being disposed "directly" on another component, there may be no sandwiched components between the components.

[0045] In this specification, "carbon number a to b" or "C a -C b In the phrase "", 'a' and 'b' refer to the number of carbon atoms in a specific functional group. That is, the functional group can include carbon atoms from 'a' to 'b'. For example, "alkyl with 1 to 2 carbon atoms" or "C1-C2" alkyl refers to an alkyl group having 1 to 2 carbon atoms, i.e., -CH3 and -CH2CH. 3。

[0046] In this specification, the term "alkyl" refers to a branched or straight-chain aliphatic hydrocarbon. In one embodiment, the alkyl group may be substituted or unsubstituted. Alkyl groups include, but are not necessarily limited to, methyl, ethyl, propyl, isopropyl, butyl, isobutyl, tert-butyl, pentyl, hexyl, cyclopropyl, cyclopentyl, cyclohexyl, cycloheptyl, etc., and each of these may be optionally substituted or unsubstituted. For example, alkyl groups having 1 to 6 carbon atoms may be methyl, ethyl, propyl, isopropyl, butyl, isobutyl, sec-butyl, pentyl, 3-pentyl, hexyl, etc., but are not limited to these.

[0047] In this specification, the term "alkoxy" refers to an oxygen atom bonded to the end of an alkyl group, C1-C2. 15 Alkoxy groups refer to compounds with the chemical formula -OA. 15 of (where A) 15 It is C1-C 15 Alkyl) monovalent groups, such as methoxy, ethoxy, isopropoxy, etc.

[0048] In this specification, "laser transfer film" refers to a thin film in which the transfer material is transferred to a receiver film due to heat and / or photocuring generated by laser irradiation onto the laser transfer film with the transfer material attached, thus transferring the transfer material. Therefore, laser transfer film is distinctly different from release film. Laser transfer film can also be referred to as a transfer. Laser transfer film can include UV-non-curable laser transfer film and UV-curable laser transfer film. The "UV-curable laser transfer film" refers to a laser transfer film that is photocured by ultraviolet light during the "manufacturing" process. In this specification, "UV-non-curable laser transfer film" refers to a laser transfer film that is not photocured by ultraviolet light during the "manufacturing" process.

[0049] In this specification, "transfer body" refers to an article that is transferred from a laser transfer film to a recipient film. For example, a transfer body can be an LED chip, a semiconductor device, etc.

[0050] For example, by using a laser, the adhesive layer in the laser transfer film is cured, thus reducing the adhesive force and enabling the transfer body to be easily transferred into a receptor film. For example, the laser is absorbed and generates heat, which instantaneously decomposes the adhesive layer in contact with the transfer body, thereby enabling the transfer body to be easily transferred into a receptor film.

[0051] Even if the laser is ultraviolet light with a wavelength of approximately 300 nm to approximately 400 nm, it is only photocured by ultraviolet light when the laser transfer film is "applied" to it, and not during the "manufacturing" process of the laser transfer film. Therefore, it can be included in the category of "UV-non-curable laser transfer film". Conversely, when part or all of any structure, material, etc., included in the laser transfer film is photocured by ultraviolet light during the "manufacturing" process, this type of laser transfer film is clearly different from "UV-non-curable laser transfer film".

[0052] Figure 1 This is a schematic diagram illustrating an ultraviolet-curable laser transfer film 10 according to an embodiment of the present invention.

[0053] Reference Figure 1 According to one embodiment, the ultraviolet non-curable laser transfer film 10 may include a substrate layer 11, a thermally expandable light-absorbing layer 12, and an adhesive layer 13.

[0054] [Substrate Layer 11]

[0055] The substrate layer 11 can serve to support other layers that acquire their functionality through a series of processes, including (i) manufacturing a UV-free laser transfer film, (ii) laminating the UV-free laser transfer film and the acceptor film, and (iii) removing the laser transfer film from the acceptor film after transfer. For example, the substrate layer 11 can support a thermally expanding light-absorbing layer 12, an adhesive layer 13, and a transfer substrate (e.g., an LED chip, a semiconductor chip, etc.) optionally attached to the adhesive layer 13.

[0056] The substrate layer 11 can be a polymer film. The polymer film can simultaneously possess light transmittance and thermal stability.

[0057] The polymer film may be a polycarbonate resin, a polyolefin resin, a polyethylene resin, a polyester resin, or any combination thereof. The polymer film may further comprise any polymer with sufficient optical properties, such as sufficient mechanical and / or thermal stability, or high transmittance to light of a specific wavelength.

[0058] The polyester resin may include linear polyesters. For example, the polyester resin may be polyethylene terephthalate (PET), polyethylene naphthalate, or any combination thereof.

[0059] The polymer used in the substrate layer 11 may be primed or roughened to improve its adhesion to the layers in contact with the substrate layer 11, or it may be stretched, heat-treated, or waterproofed to improve thermal stability, or it may contain a small amount of particles or fillers, or be waterproofed to adjust light transmittance. The surface of the substrate layer 11 may contain inorganic and / or organic particles to improve the movement and winding of the membrane during membrane manufacturing. The inorganic particles may include silica, calcium carbonate, titanium dioxide, zirconium oxide, or any combination thereof. The organic particles may include acrylic particles such as methyl methacrylate, ethyl methacrylate, isobutyl methacrylate, n-butyl methacrylate, n-methyl methacrylate, acrylic acid, copolymers of methacrylic acid, or terpolymers; olefin particles such as polyethylene, polystyrene, and polypropylene; copolymer particles of acrylic acid and olefins; or multilayer, multicomponent particles coated with other types of monomers after forming homopolymer particles.

[0060] However, the invention is not limited thereto, and the polymer film may include other polymers having sufficient mechanical / thermal stability for a particular application and sufficient optical properties (such as high transmittance to light of a particular wavelength).

[0061] The thickness of the substrate layer 11 can be from about 5 μm to about 500 μm.

[0062] [Thermal Expansion Light Absorbing Layer 12]

[0063] A thermally expandable light-absorbing layer 12 may be disposed on the substrate layer 11. The thermally expandable light-absorbing layer 12 may be in direct contact with the substrate layer 11. The thermally expandable light-absorbing layer 12 absorbs light (e.g., laser light) and converts it into heat, and expands due to this heat, thereby providing the driving force for transferring the transfer material into a receptor film. The driving force may be the heat generated by the light itself or the physical force caused by thermal expansion.

[0064] The thermally expandable light-absorbing layer 12 may include an adhesive resin and a triazine compound.

[0065] According to one embodiment, the adhesive resin contains reactive functional groups, which may include -OH, -COOH, -NH2, or any combination thereof. When irradiated with light, the reactive functional groups can generate gases such as H2O, thereby partially expanding the thermally expandable light-absorbing layer 12 in the light-irradiated portion, thus enabling the selective transfer of the transfer body.

[0066] According to one embodiment, the adhesive resin may include polyester resin, acrylic resin, polyurethane resin, melamine resin, or any combination thereof. The adhesive resin may be a thermosetting resin. The adhesive resin exhibits good compatibility with the triazine compound, ensuring good adhesion between the thermally expandable light-absorbing layer 12 and the substrate layer 11 even when the content of the triazine compound in the thermally expandable light-absorbing layer 12 is sufficiently high.

[0067] The polyester resin may be a sulfonated polyester resin or a non-sulfonated polyester resin.

[0068] The acrylic resin may include polyacrylate, polymethacrylate, polyacrylic acid, copolymers of polyacrylate and polyolefins, copolymers of polymethacrylate and polyolefins, copolymers of polyacrylic acid and polyolefins, or any combination thereof.

[0069] According to one embodiment, the adhesive resin may be a melamine-based resin. Melamine-based resins have a structure similar to that of the triazine compounds (e.g., triazine groups), and therefore have relatively high compatibility with the triazine compounds.

[0070] The triazine compound absorbs light in the ultraviolet region and can convert the absorbed light into heat. For example, the triazine compound can optionally absorb light with wavelengths from 300 nm to 450 nm. According to one embodiment, the transmittance of the triazine compound to light with wavelengths from 300 nm to 400 nm can be from 2% to 50%. For example, the transmittance range can be the transmittance range to light with a wavelength of 355 nm. The triazine compound can excessively transmit or reflect light with wavelengths outside the 300 nm to 400 nm range.

[0071] According to one embodiment, the content of the triazine compound may be from 5 to 20 parts by weight of the total 100 parts by weight of the thermally expandable light-absorbing layer 12.

[0072] When the transmittance of the triazine compound to light with a wavelength of 300 nm to 400 nm is less than 2%, or when the content of the triazine compound is less than 5 parts by weight of the total 100 parts by weight of the thermally expandable light-absorbing layer 12, the transfer characteristics may decrease because the thermally expandable light-absorbing layer 12 cannot expand sufficiently.

[0073] When the triazine compound has a transmittance of more than 50% for light with a wavelength of 300 nm to 400 nm, or when the content of the triazine compound is more than 20 parts by weight of the total 100 parts by weight of the thermally expandable light-absorbing layer 12, sufficient light may not reach the adhesive layer 13 because the light irradiated onto the substrate layer 11 is excessively absorbed by the thermally expandable light-absorbing layer 12. Therefore, when using an ultraviolet-curable laser transfer film, the adhesive layer 13 may not be sufficiently photocured, which may result in a decrease in adhesive strength, or the transfer properties may decrease because the adhesive layer 13 does not decompose instantaneously.

[0074] According to one embodiment, the triazine compound can be represented by the following chemical formula 1:

[0075] <Chemical Formula 1>

[0076]

[0077] In the chemical formula 1,

[0078] R1 to R5 are independently hydrogen, hydroxyl, C1-C 15 Alkyl, C1-C 15 alkoxy or phenyl, R6 is C1-C 15 Alkyl groups, groups represented by the following chemical formula ST1, or groups represented by the following chemical formula ST2,

[0079] <Chemical Formula ST1>

[0080]

[0081] <Chemical Formula ST2>

[0082]

[0083] In the chemical formulas ST1 and ST2, R 61 To R 65 They are either hydrogen or C1-C, independent of each other. 15 Alkyl groups, * indicates the binding site with adjacent atoms.

[0084] According to one embodiment, R1 and R4 can be independently hydrogen, hydroxyl, C1-C... 10 Alkyl or C1-C 10 Alkyl groups. For example, R1 and R4 can be -H, -OH, methyl (-CH3), or ethyl (-CH2CH3) independently of each other.

[0085] According to one embodiment, R2 and R3 can be hydrogen, C1-C, or C2-C3 independently of each other. 10 Alkyl, C1-C 10Alkoxy or phenyl. For example, R2 and R3 can be -H, methyl (-CH3), ethyl (-CH2CH3), propyl (-CH2CH2CH3), butyl (-CH2CH2CH2CH3), methoxy (-OCH3), ethoxy (-OCH2CH3), propoxy (-OCH2CH2CH3), and butoxy (-OCH2CH2CH2CH3) independently of each other.

[0086] According to one embodiment, R5 can be hydrogen, hydroxyl, or C1-C. 10 Alkyl groups. For example, R5 can be -OH, methoxy (-OCH3), ethoxy (-OCH2CH3), propoxy (-OCH2CH2CH3), or butoxy (-OCH2CH2CH2CH3).

[0087] According to one embodiment, R6 can be C1-C 10 Alkyl groups, groups represented by the chemical formula ST1, or groups represented by the chemical formula ST2, wherein the R in the chemical formula ST1 and the chemical formula ST2... 61 It is hydrogen, R 62 It is C3-C 15 Alkyl, R 63 It is hydrogen or C1-C4 alkyl, R 64 It is a C1-C4 alkyl group, R 65 It is C5-C 10 Alkyl group. In this case, the alkyl group can be a straight-chain (chain-like or unbranched) alkyl group.

[0088] For example, R6 can be butyl (-C4H9), pentyl (-C5H9), or ethyl butyl (-C5H9). 11 ), hexyl (-C6H) 13 ), heptyl (-C7H) 15 ), octyl (-C8H) 17 ), groups represented by the following chemical formulas ST1-1 to ST1-3 or groups represented by the following chemical formula ST2-1:

[0089] <Chemical Formula ST1-1>

[0090]

[0091] <Chemical Formula ST1-2>

[0092]

[0093] <Chemical Formula ST1-3>

[0094]

[0095] <Chemical Formula ST2-1>

[0096]

[0097] In the chemical formulas ST1-1 to ST1-3 and ST2-1, * represents the binding site with adjacent atoms.

[0098] According to one embodiment, the triazine compound may include Tinuvin 400 (BASF), Tinuvin 405 (BASF), Tinuvin 460 (BASF), Tinuvin 477 (BASF), Tinuvin 479 (BASF), Tinuvin 1577 (BASF), CGX UVA006 (BASF), and CyasorbUV1164 (Cytec Industries).

[0099] [Adhesive Layer 13]

[0100] The adhesive layer 13 can be disposed on the thermally expandable light-absorbing layer 12. The adhesive layer 13 can be in direct contact with the thermally expandable light-absorbing layer 12. The adhesive layer 13 serves to attach the transfer material to the UV-free laser transfer film 10. When the adhesive force of the laser transfer film (specifically, the adhesive force of the adhesive layer 13) is too low, the transfer material cannot be attached to the laser transfer film. When the adhesive force of the laser transfer film is too high, resulting in excessively high adhesive force of the recipient film, transfer may not occur even when irradiated with laser.

[0101] The adhesive layer 13 may include an adhesive composition comprising an acrylate monomer containing polar functional groups, an acrylate monomer without polar functional groups, and an acrylate copolymer containing polar functional groups. The adhesive layer 13 may be a layer thermosetting the adhesive composition.

[0102] According to one embodiment, the polar functional group may include a hydroxyl group, an amino group, a sulfonic acid group, or any combination thereof. For example, the polar functional group may be a hydroxyl group.

[0103] The acrylate monomer containing the polar functional group can be selected from the group consisting of 2-hydroxyethyl methacrylate, 2-hydroxyethyl acrylate, 4-hydroxybutyl acrylate, hydroxypropyl (meth)acrylate, and pentaerythritol triacrylate. The acrylate monomer containing the polar functional group can be a crosslinking monomer.

[0104] Acrylate monomers not containing the aforementioned polar functional groups may be selected from the group consisting of diethylene glycol diacrylate, bisphenol A diacrylate ethoxylate, 1,6-hexanediol diacrylate, neopentyl glycol diacrylate, polyethylene glycol diacrylate, propoxylated neopentyl glycol diacrylate, tetraethylene glycol diacrylate, triethylene glycol diacrylate, tripropylene glycol diacrylate, trimethylolpropane triacrylate, ethoxylated trimethylolpropane triacrylate, propoxylated glycerol triacrylate, tri(2-hydroxyethyl) isocyanurate triacrylate, pentaerythritol tetraacrylate, and diphenylpentaerythritol hexaacrylate (DPHA). Acrylate monomers not containing the aforementioned polar functional groups may be crosslinking monomers.

[0105] According to one embodiment, the acrylate copolymer containing the polar functional group can be a copolymer of acrylate monomers without polar functional groups and polymers containing polar functional groups.

[0106] According to one embodiment, the acrylate copolymer containing the polar functional groups can be a copolymer of a first compound represented by the following chemical formula 1A and a second compound represented by the following chemical formula 2A:

[0107] <Chemical Formula 1A>

[0108]

[0109] <Chemical Formula 2A>

[0110]

[0111] In the chemical formulas 1A and 2A, R 11 R 12 and R 22 They can be hydrogen or C1-C independently of each other. 20 Alkyl, R 21 It is a C1-C that has been replaced by at least one polar functional group. 20 alkyl.

[0112] That is, the acrylate copolymer containing the polar functional groups can be a copolymer of the first compound without polar functional groups and the second compound containing polar functional groups.

[0113] In the chemical formulas 1A and 2A, R 11 It can be chain-like or branched C1-C 20 Alkyl group. R 11Examples include methyl, ethyl, n-propyl, isopropyl, n-butyl, sec-butyl, isobutyl, tert-butyl, n-pentyl, tert-pentyl, isopentyl, sec-pentyl, neopentyl, 3-pentyl, hexyl, isohexyl, heptyl, octyl, isooctyl, nonyl, decyl, octadecyl, etc.

[0114] In the chemical formulas 1A and 2A, R 12 and R 22 They can be hydrogen or C1-C5 alkyl groups independently of each other. For example, R 12 and R 22 It can be hydrogen, methyl, ethyl, n-propyl, isopropyl, n-butyl, sec-butyl, isobutyl, tert-butyl, n-pentyl, tert-pentyl, isopentyl, sec-pentyl, neopentyl, or 3-pentyl.

[0115] In the chemical formulas 1A and 2A, R 21 It can be a C1-C group substituted with at least one of hydroxyl, amino, and sulfonic acid groups. 20 Alkyl group. R 21 Examples may include methyl substituted with at least one hydroxyl group, ethyl substituted with at least one hydroxyl group, n-propyl substituted with at least one hydroxyl group, isopropyl substituted with at least one hydroxyl group, n-butyl substituted with at least one hydroxyl group, sec-butyl substituted with at least one hydroxyl group, isobutyl substituted with at least one hydroxyl group, tert-butyl substituted with at least one hydroxyl group, n-pentyl substituted with at least one hydroxyl group, tert-pentyl substituted with at least one hydroxyl group, isopentyl substituted with at least one hydroxyl group, sec-pentyl substituted with at least one hydroxyl group, neopentyl substituted with at least one hydroxyl group, 3-pentyl substituted with at least one hydroxyl group, hexyl substituted with at least one hydroxyl group, isohexyl substituted with at least one hydroxyl group, heptyl substituted with at least one hydroxyl group, octyl substituted with at least one hydroxyl group, isooctyl substituted with at least one hydroxyl group, nonyl substituted with at least one hydroxyl group, decyl substituted with at least one hydroxyl group, octadecyl substituted with at least one hydroxyl group, etc.

[0116] According to one embodiment, the first compound represented by the chemical formula 1A can be selected from the group consisting of 2-ethylhexyl acrylate, 2-ethylhexyl methacrylate, methyl acrylate, ethyl acrylate, n-butyl acrylate, isobutyl acrylate, isooctyl acrylate, and octadecyl methacrylate.

[0117] According to one embodiment, the second compound represented by the chemical formula 2A can be selected from the group consisting of 2-hydroxyethyl methacrylate, 2-hydroxyethyl acrylate, 4-hydroxybutyl acrylate, and hydroxypropyl (meth)acrylate.

[0118] In the adhesive layer 13, the content of acrylate monomers containing polar functional groups can be from about 5 parts by weight to about 60 parts by weight out of a total of 100 parts by weight of the adhesive layer 13. For example, the content of acrylate monomers containing polar functional groups can be from about 10 parts by weight to about 60 parts by weight out of a total of 100 parts by weight of the adhesive layer 13, or from about 10 parts by weight to about 30 parts by weight.

[0119] In the adhesive layer 13, the content of acrylate monomers without polar functional groups can be from about 5 parts by weight to about 60 parts by weight out of a total of 100 parts by weight of the adhesive layer 13. For example, the content of acrylate monomers without polar functional groups can be from about 10 parts by weight to about 60 parts by weight out of a total of 100 parts by weight of the adhesive layer 13, or from about 10 parts by weight to about 30 parts by weight.

[0120] In the adhesive layer 13, the content of the acrylate copolymer containing polar functional groups can be from about 5 parts by weight to about 60 parts by weight out of a total of 100 parts by weight of the adhesive layer 13. For example, the content of the acrylate copolymer containing polar functional groups can be from about 10 parts by weight to about 60 parts by weight, from about 10 parts by weight to about 30 parts by weight, or from about 15 parts by weight to about 25 parts by weight out of a total of 100 parts by weight of the adhesive layer 13.

[0121] In adhesive layer 13, the content of acrylate copolymers containing polar functional groups may be greater than or the same as the content of acrylate monomers containing polar functional groups. In adhesive layer 13, the content of acrylate copolymers containing polar functional groups may be greater than or the same as the content of acrylate monomers without polar functional groups.

[0122] According to one embodiment, the adhesive layer 13 may further include a thermosetting agent and / or a photoinitiator.

[0123] Examples of the thermosetting agent include diisocyanate curing agents, melamine thermosetting agents, epoxy thermosetting agents, etc. In the adhesive layer 13, the content of the thermosetting agent can be from about 1 part by weight to about 10 parts by weight out of a total of 100 parts by weight of the adhesive layer 13. For example, the content of the thermosetting agent can be from about 5 parts by weight to about 8 parts by weight out of a total of 100 parts by weight of the adhesive layer 13. For example, the thermosetting agent can be isophorone diisocyanate.

[0124] Examples of the photoinitiator include hydroxyalkylphenyl ketone photoinitiators, phosphine oxide photoinitiators, etc. In the adhesive layer 13, the content of the photoinitiator can be from about 1 part by weight to about 10 parts by weight out of a total of 100 parts by weight of the adhesive layer 13. For example, the content of the photoinitiator can be from about 1 part by weight to about 5 parts by weight out of a total of 100 parts by weight of the adhesive layer 13. For example, the photoinitiator can be 1-hydroxycyclohexylphenyl ketone (Irgacure 184).

[0125] According to one embodiment, the adhesive force of the adhesive layer 13 can be from 10 gf / inch (gram-force / inch) to 1000 gf / inch, which can be adjusted according to the adhesive force of the receptor membrane. In this specification, "adhesive force" can refer to adhesive force measured at room temperature. For example, "adhesive force" can refer to adhesive force measured at approximately 20°C to approximately 30°C.

[0126] The adhesive strength of the adhesive layer 13 can be less than or equal to 500 gf / inch, less than or equal to 300 gf / inch, less than or equal to 100 gf / inch, less than or equal to 50 gf / inch, less than or equal to 40 gf / inch, less than or equal to 35 gf / inch, or less than or equal to 32 gf / inch.

[0127] The adhesive strength of the adhesive layer 13 can be greater than or equal to 10 gf / inch, greater than or equal to 11 gf / inch, greater than or equal to 12 gf / inch, greater than or equal to 13 gf / inch, greater than or equal to 14 gf / inch, or greater than or equal to 15 gf / inch.

[0128] According to one embodiment, the thickness of the adhesive layer 13 can be from 1 μm to 10 μm. When the thickness of the adhesive layer 13 is less than 1 μm, sufficient peel strength cannot be achieved, and due to the low adhesive force of the adhesive layer 13, the transfer material may not be able to adhere to the adhesive layer 13. When the thickness of the adhesive layer is greater than 10 μm, the transfer material may penetrate into the adhesive layer 13 (become buried or encased), thus the transfer material may not be able to transfer when irradiated with a laser.

[0129] According to one embodiment, the thickness of the adhesive layer 13 can be from 1% to 10% of the thickness of the substrate layer 11. When the thickness of the adhesive layer 13 is less than 1% of the thickness of the substrate layer 11, the adhesive force of the adhesive layer 13 is too low, so the transfer material may not be able to adhere to the adhesive layer 13. When the thickness of the adhesive layer is greater than 10% of the thickness of the substrate layer 11, the adhesive force of the adhesive layer 13 is too high, so the transfer material attached to the adhesive layer 13 may not be able to be transferred into a receptor film.

[0130] According to one embodiment, the weight-average molecular weight of the adhesive composition may be less than or equal to 1,000,000. For example, the weight-average molecular weight of the adhesive composition may be 100,000 to 1,000,000, 300,000 to 800,000, 400,000 to 700,000, or 500,000 to 600,000.

[0131] Apart from Figure 1 In addition to the adhesive layer 13 shown, an adhesive layer may also be disposed on the bottom of the substrate layer 11. That is, the substrate layer 11 may be disposed on the first adhesive layer ( Figure 1The adhesive layer 13 shown is between the first adhesive layer and the second adhesive layer. Except for its location, the second adhesive layer may comprise virtually the same material as the first adhesive layer and be formed by virtually the same method.

[0132] Figure 2 It is an illustrative representation of the use Figure 1 A diagram showing the process of transferring a UV-curable laser transfer film 10 to a transfer body 30.

[0133] Reference Figure 2 The UV-curable laser transfer film 10 and the acceptor film 20 are in a laminated state. Before laser irradiation, the transfer body 30 is attached to the adhesive layer 13 of the UV-curable laser transfer film 10.

[0134] The transfer medium 30 may include organic matter, inorganic matter, organometallic substances, or combinations thereof.

[0135] Examples of selectively patternable materials that can serve as transfer body 30 include colorants (including pigments and / or compounds dispersed in a binder), polarizers, liquid crystal materials, particles (including spacers, magnetic particles, insulating particles, and / or conductive particles for liquid crystal displays), luminescent materials (including phosphors and / or organic electroluminescent materials), photoreceptor materials that can be incorporated into light-emitting devices (e.g., electroluminescent devices), hydrophobic materials (including partition banks for inkjet acceptors), hydrophilic materials, multilayer stacks (e.g., multilayer device structures such as organic electroluminescent devices), microstructure layers, nanostructure layers, photoresists, metals, polymers, adhesives, binders, biomaterials, or combinations thereof.

[0136] The transfer body 30 may include one or more substances useful for display applications, especially for color filter manufacturing.

[0137] The transfer body 30 may include semiconductor chips such as LED chips.

[0138] The following describes an example where the transfer body 30 is an LED chip.

[0139] The laser irradiates the UV-curable laser transfer film 10 in a localized manner. Specifically, in the area where the LED chip 30 is attached, the laser can partially irradiate the area where the LED chip 30 to be irradiated is attached, and not irradiate the area where the LED chip 30 is not attached.

[0140] The wavelength of a laser can range from 300 nm to 1200 nm. For example, the wavelength of a laser can be from approximately 300 nm to approximately 400 nm, or from approximately 350 nm to approximately 360 nm. Specifically, the wavelength of a laser can be approximately 355 nm.

[0141] The laser can actually penetrate the substrate layer 11. That is, most of the laser light can reach the thermally expanding light-absorbing layer 12.

[0142] The thermally expandable light-absorbing layer 12 can absorb laser light and convert it into heat. The thermally expandable light-absorbing layer 12 heats up and expands due to the laser light, thereby forming a cavity (C) between it and the substrate layer 11.

[0143] The laser beam transmitted through the thermally expanding light-absorbing layer 12 can reach the adhesive layer 13. The adhesive layer 13 can be photocured by the laser. Due to photocuring, the adhesive strength of the adhesive layer 13 can be partially reduced. Specifically, the adhesive strength can decrease in a portion of the adhesive layer 13 that is partially irradiated by the laser. For example, in the laser-irradiated portion, the adhesive strength of the adhesive layer 13 can be from about 0 gf / inch to about 9 gf / inch.

[0144] As the adhesive force of a portion of the adhesive layer 13 in the UV-curable laser transfer film 10 decreases, the LED chip 30 in the laser-irradiated portion can be converted into the acceptor film 20 due to gravity or the adhesive force of the acceptor film 20. Specifically, the LED chip 30 can move to the adhesive layer 23 of the acceptor film 20 attached to the electrode layer 22, wherein the electrode layer 22 is disposed on the substrate layer 21 of the acceptor film 20.

[0145] In summary, by utilizing the thermal expansion of the light-absorbing layer 12 caused by laser and the decrease in adhesive force of the adhesive layer 13, the LED chip 30 is effectively transferred from the UV-free laser transfer film 10 to the acceptor film 20 through laser irradiation. The UV-free laser transfer film 10 can undergo localized UV curing due to laser irradiation, but this is because the UV-free laser transfer film 10 is used specifically for transferring the LED chip 30. The laser transfer film according to the present invention does not involve a UV curing process during its manufacture; therefore, it can be defined as a UV-free laser transfer film.

[0146] The present invention will be further described in detail below through embodiments, but the present invention is not limited thereto.

[0147] Example 1

[0148] An optical polyethylene terephthalate (PET) film (Toray Advanced Materials Co., Ltd.) with a thickness of 100 μm was prepared as the substrate layer.

[0149] A composition for forming a thermally expandable light-absorbing layer was prepared by mixing a thermosetting melamine resin (Cytek, Cymel 303) as an adhesive resin, a triazine compound A (BASF, Tinuvin 477) as a light absorber, and a solvent (a mixture of cyclohexanone and methyl ethyl ketone in a weight ratio of 40:100).

[0150] A composition 1 for forming an adhesive layer was prepared by mixing pentaerythritol triacrylate (10 wt%), pentaerythritol tetraacrylate (10 wt%), 2-ethylhexyl acrylate / 2-hydroxyethyl acrylate copolymer (20 wt%), isophorone diisocyanate (7 wt%), photoinitiator Irgacure 184 (3 wt%), and ethyl acetate (50 wt%). The weight average molecular weight of the composition 1 for forming the adhesive layer is 550,000.

[0151] After applying the composition for forming a thermally expandable light-absorbing layer onto the substrate layer using a Meyer bar, it is heat-dried at 150°C for 1 minute to achieve a dried coating weight of 3 g / m². 2 A thermally expandable light-absorbing layer with an average thickness of 2.3 μm. At this point, the content of the triazine compound A is 5 parts by weight based on 100 parts by weight of the thermally expandable light-absorbing layer.

[0152] After applying the composition 1 for forming the adhesive layer onto the thermally expandable light-absorbing layer using an applicator, the composition is heat-dried at 120°C for 2 minutes to form an adhesive layer with an average thickness of 10 μm, thereby producing a laser transfer film.

[0153] Example 2

[0154] Except that the average thickness of the adhesive layer is 5 μm, the laser transfer film was manufactured using the same method as in Example 1 above.

[0155] Example 3

[0156] Except that the average thickness of the adhesive layer is 1 μm, the laser transfer film was manufactured using the same method as in Example 1 above.

[0157] Example 4

[0158] Except for changing the content of the triazine compound A, which serves as a light absorber, to 20 parts by weight based on 100 parts by weight of the thermally expandable light-absorbing layer, a laser transfer film was manufactured by the same method as in Example 1 above.

[0159] Comparative Example 1

[0160] Except that triazine compound A, which is a light absorber, was not included in the composition for forming the thermally expandable light-absorbing layer, the laser transfer film was manufactured by the same method as in Example 1 above.

[0161] Comparative Example 2

[0162] Except for changing the content of the triazine compound A to 1 part by weight based on 100 parts by weight of thermally expandable light-absorbing layer, a laser transfer film was manufactured by the same method as in Example 1 above.

[0163] Comparative Example 3

[0164] Except for changing the content of the triazine compound A to 30 parts by weight based on 100 parts by weight of thermally expandable light-absorbing layer, a laser transfer film was manufactured by the same method as in Example 1 above.

[0165] Comparative Example 4

[0166] Except that the average thickness of the adhesive layer is 20 μm, the laser transfer film is manufactured by the same method as in Example 1 above.

[0167] Comparative Example 5

[0168] Except that the average thickness of the adhesive layer is 0.5 μm, the laser transfer film is manufactured using the same method as in Example 1 above.

[0169] Comparative Example 6

[0170] Except that composition 2 for forming the adhesive layer is used instead of composition 1 for forming the adhesive layer to form the adhesive layer, the laser transfer film is manufactured by the same method as in Example 1 above, wherein composition 2 for forming the adhesive layer is manufactured by mixing a multifunctional polyurethane acrylate oligomer and a polyester compound plasticizer. The weight-average molecular weight of composition 2 for forming the adhesive layer is 400,000.

[0171] Comparative Example 7

[0172] Except for the average thickness of the adhesive layer being 5 μm, a laser transfer film was manufactured using the same method as in Comparative Example 6 above.

[0173] Comparative Example 8

[0174] Except that the average thickness of the adhesive layer is 1 μm, the laser transfer film was manufactured using the same method as in Comparative Example 6 above.

[0175] Comparative Example 9

[0176] Except that the composition for forming the thermally expandable light-absorbing layer is not coated on the substrate layer and the composition 1 for forming the adhesive layer is directly coated on the substrate layer, the laser transfer film is manufactured by the same method as in Example 1 above.

[0177] Evaluation Example 1 (Evaluating Light Transmittance)

[0178] The transmittance of the thermal expansion light absorption layer of each laser transfer film in Example 1 and Comparative Example 1 in the region from 300 nm to 1200 nm was measured using a Shimadzu UV-3600 UV-VIS-NIR spectrophotometer. The transmittance at 355 nm was then measured and is shown in Table 1 below.

[0179] Table 1

[0180] serial number Light absorber Transmittance of thermally expanding light-absorbing layer Example 1 Triazine compound A 15％ Comparative Example 1 - 88％

[0181] As can be confirmed by Table 1 above, the thermally expandable light-absorbing layer of the laser transfer film according to Example 1, which includes triazine compound A, absorbs a suitable amount of light and has a moderate transmittance that allows a suitable amount of light to reach the adhesive layer. Conversely, since Comparative Example 1 only includes the adhesive resin and does not include triazine compound A, it can be seen that the thermally expandable light-absorbing layer of the laser transfer film absorbs a relatively small amount of light, thus it can be predicted that the thermally expandable light-absorbing layer cannot expand to a degree sufficient for effective transfer of the transfer body.

[0182] Evaluation Example 2 (Evaluating Adhesion Strength)

[0183] The adhesive strength of each laser transfer film in Examples 1 to 4 and Comparative Examples 1 to 9 was measured using a CT3 texture analyzer from BROOKFIELD with a 2 mm cylindrical probe under a compressive load of 5 kg, a compression rate of 60 mm / min, a holding time of 10 seconds, and a peel rate of 60 mm / min. The results are shown in Table 2 below.

[0184] Evaluation Example 3 (Evaluating Transfer Characteristics)

[0185] Each laser transfer film in Examples 1 to 4 and Comparative Examples 1 to 9 was laminated with a blue adhesive tape (Sanan Pharmaceutical Co., Ltd. product, chip size 125um × 250μm) to which an LED chip was attached, and the LED chip was transferred to the adhesive layer of the laser transfer film. At this time, the adhesive layer of the laser transfer film in Comparative Example 5 had a relatively thin thickness, and therefore no LED chip was attached.

[0186] In a laser transfer film with an attached LED chip, the LED chip faces downwards (in the direction of gravity), and the adhesive layer of the acceptor film, formed by coating polydimethylsiloxane (PDMS) onto glass, faces upwards and is located below it. The distance between the laser transfer film and the acceptor film is maintained at 250 μm.

[0187] The position of the LED chip on the laser transfer film was confirmed visually using a laser device, and then the film was illuminated with a laser. The experiment was conducted under optimal conditions with a laser wavelength of 355nm and a laser output ranging from 0.1W to 2W.

[0188] Ten LED chips were laser-irradiated, and the transfer characteristics of the laser transfer film were evaluated based on the number of chips transferred to the lower acceptor membrane. The results are shown in Table 2 below.

[0189] LED chip transfer count: transfer characteristics

[0190] 0: 0

[0191] 1 to 2: 1

[0192] 3 to 4: 2

[0193] 5 to 6: 3

[0194] 7 to 8: 4

[0195] 9 to 10: 5

[0196] Table 2

[0197]

[0198]

[0199] As can be seen from Table 2, the laser transfer films according to Examples 1 to 4 have superior transfer characteristics compared to the laser transfer film according to Comparative Example 1 that did not use triazine compound A and the laser transfer film according to Comparative Example 9 that did not include a thermally expanding light-absorbing layer.

[0200] It can be confirmed that the laser transfer films according to Examples 1 and 4, which contain an appropriate amount of triazine compounds, have superior transfer properties compared to the laser transfer films according to Comparative Examples 2 and 3, which contain too much or too little triazine compounds.

[0201] It can be confirmed that, compared to the excessively thick laser transfer film according to Comparative Example 4, the laser transfer films with moderate thickness according to Examples 1 to 3 exhibit superior transfer characteristics. This result may be because the adhesive force of the laser transfer film in Comparative Example 4 is too large, thereby hindering the transfer of the transfer body into a acceptor film.

[0202] Comparative Example 5, with an adhesive layer thickness of 0.5 μm, demonstrates insufficient adhesive strength to attach the LED chip to the adhesive layer. Therefore, the transfer characteristics could not be evaluated.

[0203] Furthermore, in comparative examples 6 to 8, which used different adhesive layer materials, it was confirmed that the transfer characteristics decreased due to the insufficient number of transfer bodies. Even if the transfer body was transferred, the adhesive layer would also be transferred along with the transfer body.

[0204] The thermally expandable light-absorbing layer, comprising adhesive resins and triazine compounds, can moderately absorb and transmit ultraviolet light. The absorbed light causes the thermally expandable light-absorbing layer to expand, thus facilitating the transfer of the substrate. The transmitted light causes the adhesive layer to cure, potentially reducing its adhesive strength. Therefore, even with low-power lasers, the substrate adhering to the adhesive layer surface can be easily transferred, preventing the phenomenon of a portion of the laser transfer film being transferred to the recipient film along with it.

[0205] The above description is merely an exemplary description of the technical concept of the present invention. Those skilled in the art will understand that various modifications, alterations, and substitutions can be made without departing from the technical concept or essential features of the present invention. Therefore, the embodiments described above are used to illustrate the technical concept of the present invention and not to limit it. The scope of protection of the present invention should be interpreted by the appended claims, and all technical concepts within the same scope should be interpreted as being included within the scope of protection of the present invention.

[0206] Figure Labels

[0207] 10: UV-curable laser transfer film; 11: Substrate layer

[0208] 12: Thermally expanding light-absorbing layer; 13: Adhesive layer

Claims

1. A UV-curable laser transfer film, comprising: Substrate layer; A thermally expandable light-absorbing layer is disposed on the substrate layer; as well as An adhesive layer is disposed on the thermally expandable light-absorbing layer. The thermally expandable light-absorbing layer comprises an adhesive resin and a triazine compound. The adhesive layer includes an adhesive composition comprising an acrylate monomer containing polar functional groups, an acrylate monomer without polar functional groups, and an acrylate copolymer containing polar functional groups. The adhesive resin includes melamine-based resins. The triazine compounds are represented by the following chemical formula 1: <Chemical Formula 1> In the chemical formula 1, R1 to R5 are independently hydrogen, hydroxyl, C1-C 15 Alkyl, C1-C 15 alkoxy or phenyl, R6 is C1-C 15 Alkyl groups, groups represented by the following chemical formula ST1, or groups represented by the following chemical formula ST2, <Chemical Formula ST1> <Chemical Formula ST2> In the chemical formulas ST1 and ST2, R 61 To R 65 They are either hydrogen or C1-C, independent of each other. 15 alkyl, These are the binding sites with adjacent atoms. The content of the triazine compound is 5 to 20 parts by weight of the thermally expandable light-absorbing layer out of a total of 100 parts by weight. The thickness of the adhesive layer is 1 μm to 10 μm. The adhesive layer further includes a thermosetting agent and a photoinitiator.

2. The UV-curable laser transfer film according to claim 1, wherein, The thermally expandable light-absorbing layer has a transmittance of 2% to 50% for light with all wavelengths from 300 nm to 400 nm.

3. The UV-curable laser transfer film according to claim 1, wherein, The adhesive resin contains reactive functional groups. The reactive functional groups include -OH, -COOH, -NH2, or any combination thereof.

4. The UV-curable laser transfer film according to claim 1, wherein, The polar functional groups include hydroxyl, amino, sulfonic acid, or any combination thereof.

5. The UV-curable laser transfer film according to claim 1, wherein, The adhesive layer is a layer formed by thermosetting the adhesive composition.

6. The UV-curable laser transfer film according to claim 1, wherein, The acrylate copolymer containing polar functional groups is a copolymer of a first compound represented by the following chemical formula 1A and a second compound represented by the following chemical formula 2A: <Chemical Formula 1A> <Chemical Formula 2A> In the chemical formulas 1A and 2A, R 11 R 12 and R 22 C1-C 20 Alkyl, R 21 It is a C1-C that has been replaced by at least one polar functional group. 20 alkyl.

7. The UV-curable laser transfer film according to claim 1, wherein, The content of acrylate monomers containing polar functional groups and the content of acrylate copolymers containing polar functional groups are 10 to 60 parts by weight of each of 100 parts by weight of the adhesive layer.

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