KR20210000039A - Manufacturing method of deco-film for housing of smart phone thermal transfer-ink ribbon having colored layer and the deco-film for housing of smart phone manufactured by the same - Google Patents

Abstract

The present invention relates to a method for manufacturing a decoration film for a smartphone housing using a fluorescent color ink ribbon for thermal transfer, and a decoration film for a smartphone housing manufactured thereby. The method of the present invention comprises the steps of: preparing a fluorescent color ink ribbon for thermal transfer including a fluorescent color ink film for thermal transfer having the total thickness of 1 to 2 μm by sequentially stacking a release layer, a first primer layer, a color print layer and a second primer layer; placing the fluorescent color ink ribbon for thermal transfer on a substrate for a smartphone housing to allow the second primer layer of the fluorescent color ink film for thermal transfer to face the substrate for the smartphone housing; and forming the second primer layer, the color print layer and the first primer layer on the substrate for the smartphone housing by performing a thermal transfer process using a thermal transfer head in which a voltage of 200 to 210 V is applied at the number of pulses of 60 to 80 per second (pps). The substrate for the smartphone housing is a polyester-based substrate, and the second primer layer includes a vinyl polysiloxane resin. Therefore, interface characteristics between the substrate for the smartphone housing and the second primer layer are improved, thereby simplifying the process, reducing processing time, and improving aesthetics and visibility.

Description

Manufacturing method of deco-film for housing of smart phone thermal transfer-ink ribbon having colored layer and the by manufacturing method of deco-film for smartphone housing manufactured by using fluorescent colored ink ribbon for thermal transfer deco-film for housing of smart phone manufactured by the same}

The present invention is a method of manufacturing a deco film for a smartphone housing using a fluorescent colored ink ribbon for thermal transfer that can simplify the process and reduce the process time, and improve the aesthetics and visibility of the design, and for a smartphone housing manufactured thereby It is about deco film.

In recent years, smartphones, tablet PCs, and vehicle navigation in housings with a film-based design have been popularized.In addition, in order to protect the internal parts of the product and maximize the differentiation of the design, a company logo, gradient decoration or A decoration film (deco film) printed with an input button is widely used. These deco films are usually made of synthetic resin and have low hardness, so that scratches such as scratches are easily generated by external impact. Accordingly, in recent years, not only the protection of the product, but also the development of technology for a deco film for improving aesthetics has been actively made.

Such a deco film is a situation in which a variety of colors, gloss, and patterns (ie, patterns) of the film are required to suit the tastes of modern people with various personalities.

Republic of Korea Patent Publication No. 2013-0052430 discloses an epoxy protective film for a mobile phone and a manufacturing method thereof. The manufacturing method of the epoxy protective film for mobile phones includes preparing a transparent sticker fabric, performing a conventional UV coating after UV offset printing on the transparent sticker fabric, and applying an epoxy resin to one side of the transparent film, the Moving the transparent film coated with the epoxy resin to a heat dryer, heat-treating at 30 to 45° C. for 8 to 12 hours, and bonding the epoxy resin to the transparent film to prepare an epoxy protective film, and the epoxy protective film at room temperature from 4 to 12 hours. After cooling for 6 hours, taking out of the dryer to complete the epoxy protective film, and individually packaging the epoxy protective film.

However, in the case of the above-described prior art, since a separate heat treatment and drying process is included, the process is complicated and the process time is long. In addition, this epoxy protective film for mobile phones has a problem that is not only low in aesthetics and visibility, but also has a thickness of 0.1 to 2 mm, and it is more difficult to perform by adding other processes to improve aesthetics and visibility because the thickness is too thick. .

0001) Korean Patent Application Publication No. 2013-0052430

The present invention was devised in consideration of the above points, and a method of manufacturing a deco film for a smartphone housing using a fluorescent colored ink ribbon for thermal transfer that can simplify the process and reduce the process time, and improve aesthetics and visibility And it is to provide a deco film for the smartphone housing manufactured thereby.

One embodiment of the present invention is a thermal transfer fluorescent color ink including a thermal transfer fluorescent color ink film having a total thickness of 1 to 2 μm by sequentially laminating a release layer, a first primer layer, a color printing layer, and a second primer layer Preparing a ribbon; Positioning the fluorescent colored ink ribbon for thermal transfer on a substrate for a smartphone housing so that the second primer layer of the fluorescent colored ink film for thermal transfer faces the substrate for the smartphone housing; By performing a thermal transfer process using a thermal transfer head to which a voltage of 200 to 210 V is applied at 60 to 80 pulses per second (pps), on the substrate for the smartphone housing, a second primer layer and a color printing layer And forming a first primer layer, wherein the substrate for the smartphone housing is a polyester substrate, and the second primer layer includes a vinyl polysiloxane resin, and the substrate for the smartphone housing and the second primer It provides a method of manufacturing a deco film for a smartphone housing using a fluorescent colored ink ribbon for thermal transfer with improved interfacial properties between layers.

The color printing layer may be expressed in a pink fluorescent color.

The smartphone housing substrate is a polyester substrate containing polyimide, and the second primer layer is a vinyl polysiloxane resin formed by reacting amine-modified colloidal silica with a vinyl monomer containing a carboxyl group, an acrylic compound, and A mixture of the polyurethane aqueous dispersion in a weight ratio of 3:1:1 may be used.

The color printing layer contains 10 to 50 parts by weight of a cellulose-acetate-butyrate resin, 0.1 to 20 parts by weight of an organosilane compound, and 1 to 30 parts by weight of a pigment, based on 100 parts by weight of the acrylic-melamine copolymer resin, and the pigment May be used as a fluorescent pigment containing strontium sulfide, zinc sulfide or calcium tungsten.

Another embodiment of the present invention provides a deco film for a smartphone housing manufactured by the method of manufacturing a deco film for a smartphone housing using a fluorescent colored ink ribbon for thermal transfer according to the embodiment of the present invention.

The manufacturing method of a decorative film for a smartphone housing using a fluorescent colored ink ribbon for thermal transfer according to an embodiment of the present invention uses a fluorescent colored ink ribbon for thermal transfer including a fluorescent colored ink film for thermal transfer having a total thickness of 1 to 2 μm. Thus, since the color printing layer is thermally transferred, there is an effect that additional heat treatment and drying processes are not required. Accordingly, there is an effect of simplifying the process and reducing the process time.

In addition, the fluorescent color ink film for thermal transfer having a total thickness of 1 to 2 μm has excellent color development power, and has an effect of transferring a very thin color printing layer to a substrate for a smartphone housing.

In addition, since both sides of the color printing layer are laminated with a first primer layer and a second primer layer, respectively, there is an effect of being able to be transferred to a substrate for a smartphone housing with very excellent adhesion.

Accordingly, the decorative film for a smart phone housing manufactured by the method of manufacturing a decorative film for a smart phone housing using the fluorescent colored ink ribbon for thermal transfer has an effect of greatly improving aesthetics and visibility.

1 is a schematic cross-sectional view of an actual image of a fluorescent color ink ribbon for thermal transfer including a fluorescent color ink film for thermal transfer used in the present invention, and the fluorescent color ink film for thermal transfer.
2 shows an actual image after thermal transfer of the fluorescent color ink film for thermal transfer used in the present invention on a substrate for a smartphone housing.
3 shows an actual image after thermal transfer of a fluorescent color ink film for thermal transfer used in the present invention on a substrate for a curved smartphone housing.

Hereinafter, embodiments of the present invention will be described in detail. However, this is presented as an example, and the present invention is not limited thereby, and the present invention is only defined by the scope of the claims to be described later.

One embodiment of the present invention is a thermal transfer fluorescent color ink including a thermal transfer fluorescent color ink film having a total thickness of 1 to 2 μm by sequentially laminating a release layer, a first primer layer, a color printing layer, and a second primer layer Preparing a ribbon; Positioning the fluorescent colored ink ribbon for thermal transfer on a substrate for a smartphone housing so that the second primer layer of the fluorescent colored ink film for thermal transfer faces the substrate for the smartphone housing; By performing a thermal transfer process using a thermal transfer head to which a voltage of 200 to 210 V is applied at 60 to 80 pulses per second (pps), on the substrate for the smartphone housing, a second primer layer and a color printing layer And it provides a method of manufacturing a decorative film for a smartphone housing using a fluorescent colored ink ribbon for thermal transfer comprising the step of forming a first primer layer.

An actual image of a fluorescent color ink ribbon for thermal transfer including the fluorescent color ink film for thermal transfer used in the present invention and a schematic cross-sectional view of the fluorescent color ink film for thermal transfer are shown in FIG. 1.

At this time, the substrate for the smartphone housing is a polyester substrate, and the second primer layer is made of vinyl polysiloxane resin, so that the interface characteristics between the substrate for the smartphone housing and the second primer layer are greatly improved. Can be. Therefore, by transferring a color printing layer of very good adhesion, excellent color development, and a very thin thickness than the conventional substrate for a smartphone housing, the effect of dramatically improving the aesthetics and visibility of the deco film for the smartphone housing. have. The actual image after thermal transfer of the fluorescent color ink film for thermal transfer used in the present invention onto a substrate for a smartphone housing is shown in FIG. 2.

Hereinafter, a method of manufacturing a decorative film for a smartphone housing using a fluorescent colored ink ribbon for thermal transfer according to an embodiment of the present invention will be described in more detail.

First, a release layer, a first primer layer, a color printing layer, and a second primer layer are sequentially stacked to prepare a fluorescent colored ink ribbon for thermal transfer including a fluorescent colored ink film for thermal transfer having a total thickness of 1 to 2 μm. Explain.

The manufacturing method of a decorative film for a smartphone housing using a fluorescent colored ink ribbon for thermal transfer according to an embodiment of the present invention uses a fluorescent colored ink ribbon for thermal transfer including a fluorescent colored ink film for thermal transfer having a total thickness of 1 to 2 μm. Thus, there are important technical features for thermal transfer of the color printing layer. Therefore, there is no need for an additional heat treatment and drying process, thereby simplifying the process and reducing the process time. In addition, the fluorescent color ink film for thermal transfer having a total thickness of 1 to 2 μm has excellent color development power, and has an effect of transferring a very thin color printing layer to a substrate for a smartphone housing. Accordingly, it is possible to greatly improve the operating sensitivity of the smartphone housing requiring touch manipulation or the like.

In addition, the method of manufacturing a decor film for a smartphone housing using the fluorescent colored ink ribbon for thermal transfer has a very thin thickness of the transferred color printing layer to impart the color, so another process for improving aesthetics and visibility is added. You can do it.

For example, a process of implementing a texture by forming a pattern on a deco film for a smartphone housing may be additionally performed. Alternatively, as an additional process for improving the aesthetics and visibility, a process of forming one or two or more color printing layers having different colors from each other may be additionally performed. The additional process for improving the aesthetics and visibility may be performed by processes generally used in the art according to the needs of consumers, and the specific type of the process is not particularly limited.

Next, a step of positioning the fluorescent colored ink ribbon for thermal transfer on a substrate for a smartphone housing such that the second primer layer of the fluorescent colored ink film for thermal transfer faces the substrate for a smartphone housing will be described.

The substrate for the smartphone housing used in the present invention may be used without limitation as long as it is a material suitable for thermal transfer. For example, polypropylene (PP), polyethylene (PE), polystyrene (PS), acrylonitrile-butadiene-styrene copolymer (ABS), polycarbonate (PC), polyoxymethylene (POM), polyamide ( PA), polypropylene oxide (PPO), polybutylene terephthalate (PBT), polyethylene terephthalate (PET), polyvinyl chloride (PVC), polymethyl methacrylate (PMMA), polytetrafluoroethylene (PTFE) , Polyetheretherketone (PEEK), polyphenylene sulfide (PPS), polyimide (PI), polyamide-imide (PAI), polyethyleneimine (PEI), and at least one selected from the group consisting of mixtures thereof It may include.

More preferably, the substrate for the smartphone housing is a polyethylene terephthalate (PET) substrate, and in this case, one surface of the substrate for the smartphone housing may be laminated with a primer layer containing polyimide. Accordingly, there is an effect that the color printing layer having excellent color development power can be easily transferred to the substrate for the smartphone housing.

In addition, the substrate for the smartphone housing may be applied very effectively to a substrate for a curved smartphone housing by using a polyester substrate containing polyimide. 3 shows an actual image after thermal transfer of the fluorescent color ink film for thermal transfer used in the present invention onto the curved smartphone housing substrate.

In addition, the second primer layer bonded to the smartphone housing substrate comprises a vinyl polysiloxane resin formed by reacting an amine-modified colloidal silica with a vinyl monomer containing a carboxyl group, and an acrylic compound and a polyurethane aqueous dispersion. Mixtures in a weight ratio of :1 can be used.

Accordingly, it is possible to have sufficiently excellent adhesion and thermal transfer properties even with a very thin thickness. In addition, a polyimide of a primer layer laminated on one surface of the substrate for the smartphone housing; Alternatively, by excellently bonding with the polyimide of the polyester-based substrate including polyimide, the interface characteristics between the substrate for the smartphone housing and the second primer layer may be improved.

The vinyl polysiloxane resin may be preferably formed by reacting an amine-modified colloidal silica with a vinyl monomer including a carboxyl group.

The amine-modified colloidal silica comprises colloidal silica with a compound selected from condensation polymers N-[3-(trimethoxysilyl)propyl] polyethyleneimine highhydrochloride and N-[3-(trimethoxysilyl)propyl] polyethyleneimine What was reacted directly can be used. Thereafter, the vinyl polysiloxane resin can be obtained by reacting the amine-modified colloidal silica with a vinyl monomer containing a carboxyl group.

At this time, the vinyl monomer including the carboxyl group includes an acrylic acid derivative or a methacrylic acid derivative, and for example, selected from the group consisting of acrylic acid, methacrylic acid, itaconic acid, vinyl acetic acid, vinyl propionic acid, and mixtures thereof. More than one type may be used.

In addition, the acrylic compound is based on 100 parts by weight of an acrylic monomer mixture comprising a methacrylic acid ester monomer and an ethylenic monomer in a weight ratio of 2:1, 10 to 25 parts by weight of a petroleum resin containing an acrylic group, and 1 to 10 surfactants. By using a polymerization reaction by adding 150 to 200 parts by weight of water and 0.1 to 0.5 parts by weight of a polymerization initiator, the above effect can be further improved.

In addition, the polyurethane aqueous dispersion, based on 100 parts by weight of poly(1,4-butanediol adipate), 30 to 50 parts by weight of polycaprolactone diol, 1 ,6-hexanediol (1,6-hexanediol) 10 to 30 parts by weight, dimethylolpropionic acid (Dimethylolpropionic acid) 10 to 15 parts by weight and isophorone diisocyanate (Isophorone diisocyanate) 70 to 90 parts by weight reaction to prepare a polyurethane prepolymer Prepared, neutralized by adding 5 to 7 parts by weight of triethylamine to the prepolymer, 200 to 500 parts by weight of water were added to disperse it in water, and then 2 to 5 parts by weight of ethylenediamine was added and chain extended. In addition, it is possible to improve the interface characteristics between the smartphone housing substrate and the second primer layer, and have sufficiently excellent adhesion and thermal transfer characteristics even with a very thin thickness.

In addition, the second primer layer may further include a crosslinking accelerator to further improve adhesion to the substrate for the smartphone housing. These crosslinking accelerators are generally used in the art, and the type is not particularly limited, but, for example, tetraalkyl titanate, zirconate, zinc octoate, and zinc resin At least one selected from the group consisting of zinc resinate, oxazoline, and mixtures thereof may be preferably used. In addition, the crosslinking accelerator is included in an amount of 1 to 10 parts by weight based on 100 parts by weight of a mixture of a vinyl polysiloxane resin, an acrylic compound, and an aqueous polyurethane dispersion in a weight ratio of 3:1:1. Can be further improved.

Next, by performing a thermal transfer process using a thermal transfer head to which a voltage of 200 to 210 V is applied at 60 to 80 pulses per second (pps), on the substrate for the smartphone housing, a second primer layer, A step of forming the color printing layer and the first primer layer will be described.

A method of manufacturing a deco film for a smartphone housing using a fluorescent colored ink ribbon for thermal transfer according to an embodiment of the present invention includes a thermal transfer head in which a voltage of 200 to 210 V is applied at a pulse number per second (pps) of 60 to 80. By performing the thermal transfer process by using, there is an effect of having excellent color development and transferring a very thin color printing layer to a substrate for a smartphone housing with very excellent adhesion. In addition, since it is transferred to the substrate for the smartphone housing in a very thin thickness, the operating sensitivity of the smartphone housing requiring touch manipulation or the like can be greatly improved. In addition, there is an effect that the first primer layer can be very easily separated from the release layer.

More specifically, the thermal transfer process is performed at a rate of 0.1 to 2.0 inch/sec at a pressure in the range of 300 to 350 kgf/mm ² and a temperature in the range of 80 to 105° C., and the above effects can be further improved, Excellent coating film hardness can be ensured.

In addition, the color printing layer having very excellent color development may include a pigment of a pink color so that the decor film for a smartphone housing of the present invention can express a fluorescent pink color including a blue color. The kind of the pigment is not particularly limited, but as a non-limiting example of the pigment, an organic pigment or an inorganic pigment may be used, and the organic pigment is an azo pigment, a phthalocyanine pigment, a quinacridone pigment, an isoindolinone Pigments, isoindolin pigments, perylene pigments, perinone pigments, dioxazine pigments, anthraquinone pigments, dianthraquinonyl pigments, anthrapyrimidine pigments, antantrone pigments, indanthrone pigments, flavantron pigments, pyrantrone pigment , One or more selected from the group consisting of diketopyrrolepyrrole pigments and mixed pigments thereof may be used; The inorganic pigment may include a white pigment including rutile type titanium oxide, anatase type titanium oxide, brookite type titanium oxide, fine particle titanium oxide, photocatalytic titanium oxide, zinc oxide or zinc sulfide; Clays including barium sulfate, calcium carbonate, calcium sulfate, kaolin or clay, silicon dioxide including silica or diatomaceous earth, talc, extender pigments including magnesium sulfate or alumina; Ocher, titanium yellow, bengara, ultramarine, royal blue, cobalt blue, cerulean blue, zinc green, emerald green, cobalt green, nickel-cobalt-zinc-titanium complex oxide, cobalt-chromium complex oxide, or Colored inorganic pigments or complex oxide pigments including a complex oxide of copper, chromium, and manganese; Fluorescent pigments including strontium sulfide, zinc sulfide or calcium tungsten; Phosphorescent pigments including strontium aluminate; A pearl pigment, which is a titanium-treated product of mica, including mica, muscovite mica, iron mica, or gold mica; Glass powder; Silicon carbide; Silicon nitride; ferrite; And one or more selected from the group consisting of these mixed pigments may be used.

More specifically, the pigment is a fluorescent pigment, even if the decorative film for a smartphone housing of the present invention has a color printing layer having a very thin thickness in the range of less than 2 μm, more specifically 0.5 to 1.8 μm, It can be made to realize very excellent color development. As such a fluorescent pigment, a pigment containing strontium sulfide, zinc sulfide or calcium tungsten may be preferably used.

In addition, the color printing layer may contain 10 to 50 parts by weight of a cellulose-acetate-butyrate resin, 0.1 to 20 parts by weight of an organosilane compound, and 1 to 30 parts by weight of a pigment, based on 100 parts by weight of the acrylic-melamine copolymer resin. have. Accordingly, it is possible to implement a color printing layer that is transferred to the substrate for the smartphone housing in a very thin thickness and has very excellent color development power without changing optical properties between the first primer layer and the second primer layer.

More specifically, by using a mixture of the acrylic-melamine copolymer resin and cellulose-acetate-butyrate resin in the above content range, the pencil hardness of the surface is excellent, and discoloration occurs by the first and second primer layers. It is possible to obtain a color printing layer having very excellent adhesion to a substrate for a smartphone housing while maintaining excellent color development.

In addition, the organosilane compound is R1-Si (OC ₂ H ₅ ) ₃ , R2-Si (OCH ₃ ) ₃ , R3-SiH (OCH ₃ ) ₂ , R4-SiH (OC ₂ H ₅ ) ₂ and mixtures thereof At least one organic silane compound selected from the group consisting of may be used. However, where R1 may be hydrogen, methyl group, ethyl group, allyl group, phenyl group, vinyl group, 3-aminopropyl group, 3-glycidyloxypropyl group or 3-mercaptooxypropyl group, R2 is hydrogen, methyl group, It may be an ethyl group, an isobutyl group, a phenyl group, a 3-chloropropyl group, a 3-mercaptooxypropyl group, a 3-aminopropyl group, an N-aminoethyl-3-aminopropyl group or a 3-methacryloxy group, and R3 is It may be a γ-aminopropyl group or an N-aminoethyl-3-aminopropyl group, and R4 may be a 3-aminopropyl group or a methyl group.

These organosilane compounds are R1-Si(OC ₂ H ₅ ) ₃ , R2-Si(OCH ₃ ) ₃ , R3-SiH(OCH ₃ ) ₂ , R4-SiH(OC ₂ H ₅ ) ₂ 1: 3: 3 : By using the mixture at a weight ratio of 1, the above effect can be further improved.

More specifically, the R1-Si (OC ₂ H ₅ ) ₃ is allyltriethoxysilane, triethoxysilane, phenyltriethoxysilane, vinyltriethoxysilane , 3-aminopropyltriethoxysilane, methyltriethoxysilane, ethyltriethoxysilane, 3-glycidyloxypropyltriethoxysilane, 3-mercaptopropyltriethoxysilane (3-mercaptopropyltriethoxysilane) and at least one member selected from the group consisting of mixtures thereof, and the R2-Si (OCH ₃ ) ₃ is 3-chloropropyltriethoxysilane (3 -chloropropyltrimethoxysilane), 3-mercaptopropyltrimethoxysilane, 3-aminopropyltrimethoxysilane, N-aminoethyl-3-aminopropyl-trimethoxysilane (N- aminoethyl-3-aminopropyltrimethoxysilane), trimethoxysilane, methyltrimethoxysilane, ethyltrimethoxysilane, 3-methacryloxytrimethoxysilane, isobutyl Trimethoxysilane (isobutyltrimethoxysilane), phenyltrimethoxysilane (phenyltrimethoxysilane), and at least one selected from the group consisting of mixtures thereof, and the R3-SiH(OCH ₃ ) ₂ is γ-aminopropylmethyldimethoxysilane (γ-aminopropylmethyldimethoxysilane), N-aminoethyl-3-aminopropyl-di Methoxymethylsilane (N-aminoethyl-3-aminopropyl-dimethoxymethysilane) and one or more selected from the group consisting of mixtures thereof, and the R4-SiH (OC ₂ H ₅ ) ₂ is 3-aminopropyl diethoxysilane One or more selected from the group consisting of (3-aminopropyldiethoxysilane), methyldiethoxysilane, and mixtures thereof may be used.

In addition, it is preferable that the first primer layer has excellent adhesion to the release layer at room temperature, imparts shape stability to the fluorescent color ink film for thermal transfer, and can be easily separated from the release layer by thermal transfer. Can be used.

More specifically, the first primer layer comprises a vinyl polysiloxane resin, an acrylic compound, and an aqueous polyurethane dispersion in a weight ratio of 3:0.5:0.5, based on 100 parts by weight of zinc stearate, zinc stearyl phosphate, and their By using one or more selected from the group consisting of mixtures in the range of 20 to 50 parts by weight, the above effects can be further improved.

In this case, the vinyl polysiloxane resin, the acrylic compound, and the polyurethane aqueous dispersion used in the first primer layer are as described with respect to the components used in the second primer layer.

Another embodiment of the present invention provides a deco film for a smartphone housing manufactured by the method of manufacturing a deco film for a smartphone housing using a fluorescent colored ink ribbon for thermal transfer according to the embodiment of the present invention.

The manufacturing method of a decorative film for a smartphone housing using a fluorescent colored ink ribbon for thermal transfer according to an embodiment of the present invention uses a fluorescent colored ink ribbon for thermal transfer including a fluorescent colored ink film for thermal transfer having a total thickness of 1 to 2 μm. Thus, since the color printing layer is thermally transferred, there is an effect that additional heat treatment and drying processes are not required. Accordingly, there is an effect of simplifying the process and reducing the process time.

In addition, the fluorescent color ink film for thermal transfer having a total thickness of 1 to 2 μm has excellent color development power, and has an effect of transferring a very thin color printing layer to a substrate for a smartphone housing.

In addition, since both sides of the color printing layer are laminated with a first primer layer and a second primer layer, respectively, there is an effect of being able to be transferred to a substrate for a smartphone housing with very excellent adhesion.

Accordingly, the decorative film for a smart phone housing manufactured by the method of manufacturing a decorative film for a smart phone housing using the fluorescent colored ink ribbon for thermal transfer has an effect of greatly improving aesthetics and visibility.

The description of the above embodiments, etc., is merely illustrative of the technical idea of the present invention, and those of ordinary skill in the technical field to which the present invention pertains can various modifications and variations without departing from the essential characteristics of the present invention. Do. Accordingly, the exemplary embodiments disclosed in the present disclosure are not intended to limit the technical idea of the present invention, but to explain the technical idea, and the scope of the technical idea of the present disclosure is not limited by this exemplary embodiment. The scope of protection of the present invention should be interpreted by the following claims, and all technical ideas within the scope equivalent thereto should be interpreted as being included in the scope of the present invention.

Claims (5)

Preparing a fluorescent color ink ribbon for thermal transfer including a fluorescent color ink film for thermal transfer having a total thickness of 1 to 2 μm by sequentially laminating a release layer, a first primer layer, a color printing layer, and a second primer layer;
Positioning the fluorescent colored ink ribbon for thermal transfer on a substrate for a smartphone housing so that the second primer layer of the fluorescent colored ink film for thermal transfer faces the substrate for the smartphone housing;
By performing a thermal transfer process using a thermal transfer head to which a voltage of 200 to 210 V is applied at 60 to 80 pulses per second (pps), on the substrate for the smartphone housing, a second primer layer and a color printing layer And forming a first primer layer,
The smartphone housing substrate is a polyester substrate, the second primer layer comprises a vinyl polysiloxane resin, thermal transfer, characterized in that the interface characteristics between the smartphone housing substrate and the second primer layer are improved Method of manufacturing a deco film for a smartphone housing using a fluorescent colored ink ribbon.
The method of claim 1,
The method of manufacturing a deco film for a smartphone housing using a fluorescent colored ink ribbon for thermal transfer, wherein the color printing layer is expressed in a pink fluorescent color including a blue color.
The method of claim 2,
The substrate for the smartphone housing is a polyester-based substrate containing polyimide,
The second primer layer is characterized by mixing a vinyl polysiloxane resin formed by reacting an amine-modified colloidal silica with a vinyl monomer containing a carboxyl group, and an acrylic compound and a polyurethane aqueous dispersion in a weight ratio of 3:1:1. A method of manufacturing a deco film for a smartphone housing using a fluorescent colored ink ribbon for thermal transfer.

The method of claim 3,
The method of claim 3,
The color printing layer contains 10 to 50 parts by weight of a cellulose-acetate-butyrate resin, 0.1 to 20 parts by weight of an organosilane compound, and 1 to 30 parts by weight of a pigment, based on 100 parts by weight of the acrylic-melamine copolymer resin,
The pigment is a fluorescent color pigment containing strontium sulfide, zinc sulfide, or tungsten calcium. A method of manufacturing a decorative film for a smartphone housing using a fluorescent colored ink ribbon for thermal transfer.
A deco film for a smartphone housing manufactured by the method of manufacturing a deco film for a smartphone housing using a fluorescent colored ink ribbon for thermal transfer according to any one of claims 1 to 4.

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