JP2011218335A - Method of manufacturing transfer sheet and transfer sheet - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a method of manufacturing a transfer sheet for transferring a coating layer made of a liquid coating to a member which does not cause displacement between the coating layer and an adhesive layer and enables stable manufacture of a transfer sheet with a high yield.SOLUTION: The method of manufacturing a transfer sheet includes a process of forming a release layer 3 by applying a release agent to a substrate 2 to form a coating film, a process of forming a coating layer 4 by applying a liquid coating to the release layer 3 to form a coating film and a process of forming an adhesive layer 6 by applying an adhesive 5 to the coating layer 4 and positions outside the coating layer 4. The liquid coating is prepared so as to be capable of forming a coating film on the release layer 3 because of containing a levelling agent. During formation of the adhesive layer 6, the adhesive layer 6 is formed exclusively on the coating layer 4 owing to the repulsion between the adhesive agent 5 and the release layer 3 and the surface tension of the adhesive 5.

Description

  The present invention relates to a transfer sheet manufacturing method and transfer sheet used for transferring a paint layer to various members.

  As shown in FIG. 2, the transfer sheet 11 has a structure in which a base material 12, a release layer 13, a paint layer 14, and an adhesive layer 16 are laminated in this order. When the adhesive layer 16 of the transfer sheet 11 is overlaid on an appropriate member, or further subjected to heat / pressure treatment as necessary, the coating layer 14 is adhered to the surface of the member via the adhesive layer 16. . Thereafter, the base material 12 is peeled from the member together with the release layer 13, whereby the coating layer 14 is transferred to the surface of the member.

  When manufacturing this type of transfer sheet 11, for example, a release agent is first applied and formed on the substrate 12 to form a release layer 13, and a paint is applied and formed on the release layer 13. Layer 14 is formed. The paint layer 14 is partially formed on the release layer 13. The paint is partially applied by, for example, a screen printing method. Next, an adhesive is applied on the paint layer 14 to form the adhesive layer 16. The partial application of the adhesive is also performed by, for example, screen printing.

  In the case where the transfer sheet 11 is manufactured in this way, if a displacement occurs between the paint layer 14 and the adhesive layer 16, a part of the paint layer 14 is not transferred to the member and is represented by the paint layer 14. Chipping will occur in the design. Since it is difficult to precisely match the positions of the coating layer 14 and the adhesive layer 16, it is difficult to manufacture the transfer sheet 11 with a high yield.

  Therefore, as shown in FIG. 2, the adhesive layer 16 is formed not only on the paint layer 14 but also at a position slightly protruding from the paint layer 14. In this case, even if a slight shift occurs in the position of the adhesive layer 16, the adhesive layer 16 is reliably formed on the paint layer 14. However, when the coating layer 14 is transferred to the member by such a transfer sheet 11, the adhesive layer 16 protrudes from the coating layer 14 on the surface of the member like a border. In order to improve the appearance, it is preferable that the adhesive layer 16 does not protrude.

  Patent Document 1 proposes a technique for eliminating the need to protrude such an adhesive. This Patent Document 1 shows a transfer sheet used when a toner image by color copy is transferred to a ceramic, especially in the field of ceramic design. In this transfer sheet, an oil-based release agent such as silicon is applied to a sheet-like base material, a toner image is formed on the electrostatic copying machine or laser printer, and a heat-melt adhesive property is further formed thereon. The adhesive is prepared by applying an adhesive hydrosol of a plastic resin emulsion with a brush or the like. The adhesive hydrosol is applied so that the adhesive hydrosol that protrudes from the toner image converges on the toner image due to repulsion with the oil release agent and the surface tension of the adhesive hydrosol itself. .

Japanese Patent No. 4352385

  The technique described in Patent Document 1 relates to a special application of transferring a toner image formed by a color printer or the like. On the other hand, a liquid paint is widely used for forming a paint layer on a transfer sheet.

  However, when the liquid paint is applied on the oil-based mold release agent as in Patent Document 1, the liquid paint is repelled by the oil-type mold release agent, and the paint layer is not formed.

  The present invention has been made in view of the above reasons, and in producing a transfer sheet for transferring a paint layer formed from a liquid paint to a member, without causing a displacement between the paint layer and the adhesive layer, It is another object of the present invention to provide a method for producing a transfer sheet stably with high yield, and a transfer sheet produced by this method.

  The method for producing a transfer sheet according to the present invention includes a step of forming a release layer by coating a release agent on a substrate, and a coating by coating a liquid paint on the release layer. A step of forming a layer, and a step of forming an adhesive layer by applying an adhesive on the coating layer and at a position protruding from the coating layer. The liquid paint contains a leveling agent and is prepared so as to be capable of being applied and formed on the release layer. When the adhesive layer is formed, the adhesive layer is formed only on the paint layer due to repulsion between the adhesive and the release layer and the surface tension of the adhesive.

  In the method for producing a transfer sheet according to the present invention, the release agent is preferably a silicone release agent or a fluorine release agent.

  In the method for producing a transfer sheet according to the present invention, the viscosity of the liquid paint at a liquid temperature of 25 ° C. measured with a B-type viscometer is preferably in the range of 1 to 5 Pa · s.

  In the method for producing a transfer sheet according to the present invention, the viscosity of the adhesive at a liquid temperature of 25 ° C. measured with a B-type viscometer is preferably in the range of 0.2 to 0.5 Pa · s. .

  The transfer sheet according to the present invention is manufactured by the transfer sheet manufacturing method, and the adhesive layer is formed on the coating layer without protruding from the coating layer.

  According to the present invention, in manufacturing a transfer sheet for transferring a pattern or the like formed from a liquid paint to a member, a transfer sheet having no positional deviation between the paint layer and the adhesive layer for forming the pattern or the like, It can be manufactured stably with a good yield.

(A) thru | or (c) is a schematic sectional drawing which shows one Embodiment of this invention. It is a schematic sectional drawing which shows an example of a prior art.

  The transfer sheet 1 has a structure in which a substrate 2, a release layer 3, a paint layer 4, and an adhesive layer 6 are laminated in this order.

  Although the material of the base material 2 is not particularly limited, specific examples of the material include resins such as polypropylene resin and polyethylene terephthalate resin. The substrate 2 is preferably a flexible sheet.

  The release layer 3 is formed by applying and forming a release agent on the substrate 2. For example, the release layer 3 is formed over the entire surface of one side in the thickness direction of the substrate 2. Examples of the release agent include silicone release agents and fluorine release agents. When the release layer 3 is formed from these release agents, the repulsion between the release layer 3 and the adhesive 5 becomes particularly large.

  As a method for forming the release layer 3, an appropriate method is adopted. For example, after a release agent is applied on the substrate 2 by an appropriate method such as roll coating, die coating, flow coating, or gravure coating. The release layer 3 is formed by performing a treatment such as heating as necessary.

  The thickness of the release layer 3 is not particularly limited, but is formed in the range of 15 to 50 μm, for example.

  As an index of releasability that the release layer 3 has, peel strength measured by a cellophane adhesive tape peel test can be used. The peel strength measured when the cellophane adhesive tape peel test is performed on the surface of the release layer 3 is preferably in the range of 100 to 1000 mN / 50 mm. This peel strength is a value measured using a cellophane adhesive tape (No. 502 tape) manufactured by Nitto Denko Corporation under the conditions of a peel rate of 0.3 m / min and a peel angle of 180 °. The peel strength measured on the surface of the release layer 3 formed from a release agent usually used in a conventional transfer sheet, such as a melamine release agent or an alkyd release agent, is It is 3000 mN / 50 mm or more.

  The paint layer 4 is formed by applying and coating a liquid paint. The liquid paint contains, for example, a resin component and a colorant, and further contains a solvent or a dispersion medium as necessary.

  Examples of the resin component include thermoplastic resins such as vinyl chloride resins, acrylic resins, polyester resins, polyamide resins and polycarbonate resins; thermosetting resins such as epoxy resins and melamine resins; acrylic resins and the like Examples include ultraviolet curable resins.

  Examples of the colorant include dyes such as monoazo dyes and copper phthalocyanine chelates, and pigments such as titanium white, carbon black, soluble azo pigments, copper phthalocyanine pigments, and insoluble azo pigments. The liquid paint may contain only one colorant or two or more colorants. Examples of the solvent or dispersion medium include organic compounds such as isophorone, anone, solvesso, cyclohexanone, toluene, xylene, butyl acetate, and isopropyl alcohol. When a water-soluble resin or a water-dispersible resin is used as the resin component, water may be used as a solvent or a dispersion medium.

  The liquid paint further contains a leveling agent. For this reason, when the liquid paint is applied, the liquid paint is not repelled on the release agent, and the moldability of the paint layer 4 is improved. The leveling agent is appropriately selected and used according to the composition of the liquid paint or the release agent, and for example, a silicone-based surfactant is preferably used. The content of the leveling agent in the liquid paint is appropriately set so that the liquid paint exhibits desired characteristics, but is preferably in the range of 0.5 to 5% by mass with respect to the entire liquid paint.

  Furthermore, the liquid resin preferably has a high viscosity that is difficult to be repelled from the release layer 3. In particular, the viscosity (rotor No. 4, liquid temperature 25 ° C.) of the liquid resin measured with a B-type viscometer is preferably in the range of 1 to 5 Pa · s.

  The liquid paint may contain a thickener for viscosity adjustment. In this case, the liquid paint is more difficult to be repelled on the release layer 3. Specific examples of the thickener include silica powder. The content of the thickener is appropriately adjusted so that the viscosity of the liquid paint has a predetermined value, and is, for example, in the range of 1 to 5 mass%.

  The liquid paint may be an aqueous paint containing water as a solvent or a dispersion medium, or a solvent-based paint containing an organic solvent. However, the content of the solvent or dispersion medium in the liquid paint is preferably an amount that does not cause a decrease in viscosity of the liquid paint, and the content of the solvent or dispersion medium is particularly preferably 50% by mass or less. .

  The paint layer 4 is partially formed on the release layer 3. An appropriate method is adopted as a method for forming the paint layer 4. For example, a liquid paint is partially applied to the release layer 3 by a screen printing method, a gravure printing method, or the like, and then formed into a film. A paint layer 4 is formed. At the time of film formation, depending on the composition, the liquid paint is formed by drying, for example, or cured by heating to form a film, or cured by irradiation with ultraviolet rays or the like. Is done. When the coating layer 4 is formed, a plurality of types of liquid coatings having different colorant compositions may be applied by a multicolor printing method to form a plurality of coating layers 4 having different colors.

  The thickness of the paint layer 4 is not particularly limited, but is formed in the range of 0.5 to 20 μm, for example.

  The adhesive layer 6 is formed by applying an adhesive 5 on the paint layer 4. Examples of the adhesive 5 include a heat-sensitive adhesive 5 containing a thermoplastic resin such as a vinyl chloride resin, an acrylic resin, a polyester resin, a polyamide resin, and a polycarbonate resin, an epoxy resin, a melamine resin, and the like. The thermosetting type adhesive 5 containing a thermosetting resin is mentioned.

  As the adhesive 5, an adhesive that repels and repels the release layer 3 is used. Furthermore, it is desirable that the viscosity of the adhesive 5 is as low as possible in order for the adhesive 5 disposed on the release layer 3 to move quickly onto the paint layer 4. In particular, the viscosity (rotor No. 4, liquid temperature 25 ° C.) of the adhesive 5 as measured with a B-type viscometer is preferably in the range of 0.2 to 0.5 Pa · s.

  In addition, since the release layer 3 formed from the oil-based release agent as described above repels many resins and solvents, the adhesive 5 that repels and repels such a release layer 3 is very It is easy to obtain by appropriately selecting from general adhesives. Also, the viscosity of the adhesive 5 can be easily adjusted by adjusting the content of the solvent.

  The adhesive 5 may be a water-based adhesive 5 containing water as a solvent or a dispersion medium, or may be a solvent-based adhesive 5 containing an organic solvent. The content of the solvent or dispersion medium in the adhesive 5 is preferably such an amount that the viscosity of the adhesive 5 is sufficiently reduced, and particularly preferably in the range of 70 to 90% by mass.

  At the time of forming the adhesive layer 6, the adhesive 5 is applied onto the paint layer 4 and further applied onto the release layer 3 at a position protruding from the paint layer 4. The adhesive 5 on the paint layer 4 and the adhesive 5 on the release layer 3 form a continuous film. The width W of the region to which the adhesive 5 is applied outside the adhesive layer 6 is preferably in the range of 0.1 to 0.5 mm (see FIG. 1B). An appropriate method is adopted as a method for forming the adhesive layer 6. For example, after the adhesive 5 is applied by a screen printing method, a gravure printing method, or the like, the adhesive layer 6 is heated and dried as necessary. 6 is formed.

  When the adhesive 5 is applied in this manner, the adhesive 5 repels the release layer 3 and moves toward the coating layer 4 on the release layer 3, and further, due to the surface tension of the adhesive 5 itself. The adhesive 5 is disposed only on the paint layer 4. For this reason, even if the position of the paint layer 4 and the application position of the adhesive 5 are not strictly aligned, the release layer 3 is formed on the paint layer 4 with high positional accuracy, and the release layer 3 is formed of the paint. It will not protrude from layer 4.

  Although the thickness in particular of the contact bonding layer 6 is not restrict | limited, For example, it forms in the range of 0.5-5 micrometers.

  The transfer of the paint layer 4 using this transfer sheet 1 will be described. When the coating layer 4 is transferred, the transfer sheet 1 is first superimposed on the surfaces of various members. In this state, the adhesive layer 6 of the transfer sheet 1 is adhered to the surface of the member. For example, when the adhesive layer 6 is formed from the heat-sensitive adhesive 5, the adhesive layer 6 is bonded to the surface of the member by being cooled after being heated. When the adhesive layer 6 is formed from the thermosetting adhesive 5, the adhesive layer 6 is bonded to the surface of the member by being heated.

  Next, the base material 2 is peeled from the member together with the release layer 3. The adhesive layer 6 and the paint layer 4 remain on the surface of the member, whereby the paint layer 4 is transferred onto the surface of the member.

  When the coating layer 4 is thus transferred from the transfer sheet 1 onto the member, the release layer 3 is formed on the coating layer 4 with high positional accuracy in the transfer sheet 1 as described above, and the release layer 3 Does not protrude from the paint layer 4, it becomes difficult for the adhesive layer 6 to protrude from the paint layer 4 transferred onto the member. Therefore, the appearance of the member to which the paint layer 4 is transferred is improved.

[Example 1]
A substrate 2 made of a polyethylene terephthalate film (product number S25, manufactured by Unitika Ltd.) having a thickness of 25 μm, and a release layer 3 formed from a silicone release agent (product number SS1645 manufactured by Dainichi Seika Kogyo Co., Ltd.) A sheet material having a laminated structure was prepared. The peel strength of the surface of the release layer 3 in this sheet material was measured using a cellophane adhesive tape (No. 502 tape) manufactured by Nitto Denko Corporation under the conditions of a peel rate of 0.3 m / min and a peel angle of 180 °. As a result, the value was 800 mN / 50 mm.

  The liquid paint contains an epoxy resin (manufactured by Seiko Advance Co., Ltd., product number 1400 (N)), and further contains 2 masses of leveling agent (silicone surfactant, product number TC-L01, manufactured by Tanaka Chemical Co., Ltd.). %, A paint containing 2% by mass of a thickener (silica powder manufactured by Teikoku Ink Manufacturing Co., Ltd.) and 40% by mass of a solvent (isophorone) was used. The viscosity of this liquid resin was measured at a liquid temperature of 25 ° C. 4 was measured with a B-type viscometer and found to be 1.2 Pa · s.

  As the adhesive 5, an adhesive 5 containing an epoxy resin (manufactured by Seiko Advance Co., Ltd., product number 1400 (N)) and further containing a solvent (isophorone) at a ratio of 80% by mass was used. The viscosity of the adhesive 5 was set at a rotor temperature of 25 ° C. 4 and measured with a B-type viscometer, it was 0.3 Pa · s.

  A liquid paint is partially applied on the release layer 3 of the sheet material by screen printing, and then heated at 105 ° C. for 10 seconds to partially form a paint layer 4 having a thickness of 5 μm on the release layer 3. Formed.

  An adhesive 5 was applied on the paint layer 4 by a screen printing method. The application position of the adhesive 5 was set to an area in which the entire width of the paint layer 4 and the width W protruding around the paint layer 4 were 0.2 mm. After 3 seconds from the end of application of the adhesive 5, the adhesive 5 was dried at 105 ° C. for 10 seconds to form the adhesive layer 6.

[Example 2]
A sheet material having the same structure as that in Example 1 was prepared.

  The liquid paint contains an epoxy resin (Imperial Ink Manufacturing Co., Ltd., part number MAB), and further increases the leveling agent (silicone surfactant, Teikoku Ink Manufacturing Co., Ltd., part number SM40) by 3% by mass. A paint containing 2% by mass of a sticking agent (silica powder manufactured by Teikoku Ink Manufacturing Co., Ltd.) and 40% by mass of a solvent (isophorone) was used. The viscosity of this liquid resin was measured at a liquid temperature of 25 ° C. 4 and measured with a B-type viscometer, it was 2.5 Pa · s.

  A coating layer 4 was formed on the release layer 3 of the sheet material by the same method as in Example 1, and an adhesive layer 6 was formed on the coating layer 4 by the same method as in Example 1. .

[Comparative Example 1]
In Example 1, a leveling agent and a thickener were not blended in the liquid paint. The viscosity of this liquid resin was measured at a liquid temperature of 25 ° C. 4 and measured with a B-type viscometer, it was 0.4 Pa · s.

  Other than that, production of the transfer sheet 1 was attempted under the same conditions as in the example.

  However, in Comparative Example 1, the liquid paint was repelled from the release layer 3 when the liquid paint was applied, the paint layer 4 was not formed, and the transfer sheet 1 could not be produced.

[Comparative Example 2]
In place of the sheet material in Example 1, a sheet material having a structure in which a base material 2 made of a polyethylene terephthalate film having a thickness of 25 μm and a release layer 3 formed from an alkyd type release agent are laminated (Co., Ltd.) The product number AL-5 made by Lintec was prepared. The surface of the release layer 3 was measured for peel strength using a cellophane adhesive tape (No. 502 tape) manufactured by Nitto Denko Corporation under conditions of a peel rate of 0.3 m / min and a peel angle of 180 °. Was 4000 mN / 50 mm.

  Otherwise, a transfer sheet 1 was produced under the same conditions as in Example 1.

[Evaluation]
The transfer sheets 1 obtained in Examples 1 and 2 and Comparative Example 2 were stacked on the surface of a glass bottle. The roller for thermocompression bonding was heated to 180 ° C., and the roller was moved at a speed of 4 cm / second while pressing the roller onto the transfer sheet 1 with a pressure of 3.43 MPa. Subsequently, the base material 2 of the transfer sheet 1 was peeled from the glass bottle together with the release layer 3.

  When the paint layer 4 transferred to the glass bottle was visually observed, in Comparative Example 2, a border by the transparent adhesive layer 6 was recognized around the paint layer 4. On the other hand, in Example 1 and Example 2, the border in the case of Comparative Example 2 was not recognized, and the coating layer 4 was not chipped.

DESCRIPTION OF SYMBOLS 1 Transfer sheet 2 Base material 3 Release layer 4 Paint layer 5 Adhesive 6 Adhesive layer

Claims (5)

A step of forming a release layer by coating and forming a release agent on the substrate, a step of forming a coating layer by coating and forming a liquid coating on the release layer, and the coating layer And forming an adhesive layer by applying an adhesive at a position protruding from the paint layer,
The liquid paint contains a leveling agent and is prepared so as to be capable of being applied and formed on the release layer.
A method for producing a transfer sheet, wherein the adhesive layer is formed only on the paint layer by repulsion between the adhesive and the release layer and surface tension of the adhesive when forming the adhesive layer.   The method for producing a transfer sheet according to claim 1, wherein the release agent is a silicone release agent or a fluorine release agent.   2. The method for producing a transfer sheet according to claim 1, wherein the liquid paint has a viscosity at a liquid temperature of 25 ° C. measured with a B-type viscometer in a range of 1 to 5 Pa · s.   The transfer sheet according to claim 1, wherein the adhesive has a viscosity at a liquid temperature of 25 ° C. measured with a B-type viscometer in a range of 0.2 to 0.5 Pa · s. Manufacturing method.   A transfer sheet produced by the method according to claim 1, wherein the adhesive layer is formed on the paint layer without protruding from the paint layer.

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