JP2003231394A - Transfer sheet and decorative material - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a transfer sheet, which makes it possible to easily transfer a transfer layer, such as a pattern layer and the like, in a good condition to the surface of a transfer-target base material having fine recessions and projections on the surface, such as a wooden base material, without causing transfer miss or adhesion failure, and a decorative material manufactured by using the transfer sheet. <P>SOLUTION: The transfer sheet comprises a base material sheet 1, which is a thermoplastic resin sheet having a tensile strength of 140 to 210 MPa. It is desirable that the base material sheet is a polyethylene terephthalate resin sheet, and its transfer layer 2 forming surface may be in a delustered state. The transfer sheet has modest flexibility to allow it to follow the fine recessions and projections on the surface of the transfer-target base material and to push the transfer layer into the recessions upon transferring. As a result, transfer miss or adhesion failure occurring on the recessions (separation of an adhesive tape) is prevented more effectively and the adhesiveness of the transfer layer is improved. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a transfer sheet suitable for transfer-forming a pattern or the like by printing on the surface of a transfer-receiving substrate having fine irregularities on the surface, and a makeup produced using the transfer sheet. It is related to materials.

[0002]

2. Description of the Related Art When manufacturing various decorative materials such as interior building materials and fittings, building materials, vehicle interior materials, furniture materials, exterior materials for home electric appliances, etc. on the surface of a building such as a house, wood grain pattern or stone grain pattern, etc. As one of the methods for imparting a desired design, the transfer method using a transfer sheet has been used for a long time. This is done by first providing a desired design on the surface of a target decorative material on the surface of a base material sheet, which is a temporary support made of, for example, a synthetic resin sheet, in a peelable manner by printing or the like to form a transfer layer. A transfer sheet that has been formed is prepared, and then the transfer layer surface of this transfer sheet is pressure-bonded to the surface of a transfer base material such as a wood base material or an inorganic base material that is a base material for a decorative material. Then, the transfer layer is adhered to the surface of the substrate to be transferred, and the base material sheet is peeled and removed, whereby the surface of the substrate to be transferred is subjected to design processing by the transfer layer.

[0003] By the way, examples of the substrate to be transferred to be used for the production of the decorative material by the transfer method are wood-based substrates such as plywood, medium density fiberboard and particle board, calcium silicate plate and wood wool cement plate. In many cases, such as an inorganic base material such as lightweight cellular concrete, the surface thereof has fine irregularities derived from its material. These fine irregularities are
The thickness of the printing ink of the pattern layer formed by normal printing is about several μm, although it is usually about several μm to several tens of μm. Therefore, the transfer layer composed of such a thin film-like pattern layer is used as the transfer substrate. It is difficult to continuously adhere the transfer layer and the transfer-receiving base material over the entire surface even if the transfer is performed on the surface of the sheet, and in many cases, dot-like adhesion is caused. Then, after the transfer sheet is pressure-bonded, when the base material sheet is peeled from the transfer layer, the transfer layer in a portion which is not in close contact with the transfer target material is peeled and removed together with the base material sheet, and so-called transfer omission occurs. Alternatively, when a cellophane tape or the like is attached to the surface after transfer and then peeled off, a part of the transfer layer may be peeled off together with the cellophane tape or the like.

In order to bring the transfer layer into close contact with the surface of the substrate to be transferred having fine irregularities, before the transfer step, a sealing treatment with a sealer or the like is applied to the surface of the substrate to be transferred beforehand. A method of finishing the surface of the transferred substrate by a polishing treatment, or a method of completely smoothing fine irregularities on the surface of the transferred substrate before the transfer process. There is also a method of applying a large amount of adhesive so as to form the surface. However, such a method requires a high material cost, a complicated process, remarkably low production efficiency, and causes an increase in the price of the manufactured decorative material. Therefore, a pretreatment that can easily complete the transfer work in one step is required. There is a need for a remedy that is not needed.

Therefore, an adhesive layer made of a heat-sensitive adhesive having a relatively low melting temperature and melt viscosity is provided on the back surface side of the transfer layer in the transfer sheet with a relatively large thickness (for example, about 20 to 30 μm), and heat at the time of transfer is provided. There is also a proposal of a method of melting and fluidizing the adhesive layer by pressure to fill the fine irregularities on the surface of the transferred substrate to obtain good adhesion (JP-A-1-1392).
94, Japanese Utility Model Publication No. 4-83700, etc.). However, even with this method, in order to completely fill all the fine irregularities on the surface of the transferred substrate by the melt flow of the adhesive layer, it is necessary to heat-press the transfer sheet and the transferred substrate for a long time. In addition, the design layer may also be deformed by flow and deformation along with the melt flow of the adhesive layer, and the design may not be transferred normally due to wrinkling of the transfer sheet. Since a thick heat-sensitive adhesive having a low viscosity is provided, there is a problem that the transfer layer surface after transfer is inferior in heat resistance, and it cannot be said to be a perfect countermeasure.

[0006]

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems in the prior art, and the object of the present invention is to provide a surface-like material such as a wooden base material. Even on the surface of the transferred substrate with fine irregularities,
It is an object of the present invention to provide a transfer sheet capable of transferring a transfer layer such as a pattern layer in a good and convenient manner without causing transfer omission or poor adhesion, and a decorative material manufactured using the transfer sheet.

[0007]

The transfer sheet of the present invention comprises:
In a transfer sheet having a transfer layer including at least an adhesive layer on a base sheet made of a thermoplastic resin, the base sheet has a tensile strength of 140 to 210 MPa.

Further, in particular, the substrate sheet is made of polyethylene terephthalate resin.

Further, in particular, the surface of the base sheet on the transfer layer side is matte.

Further, in particular, the transfer layer includes, in addition to the adhesive layer, at least one of a release layer, a protective layer, a pattern layer, and a concealing solid layer on the side of the base sheet. Is.

The decorative material of the present invention is obtained by transferring the transfer layer onto the surface of a transfer-receiving substrate having fine irregularities on the surface using the above-mentioned transfer sheet.

[0012]

BEST MODE FOR CARRYING OUT THE INVENTION In the transfer sheet of the present invention, as shown in FIG. 1 and FIG. 2, the transfer layer 2 composed of the pattern layer 23 and the like can be peeled off on one surface of the base material sheet 1 composed of a thermoplastic resin. The transfer sheet is a laminated transfer sheet, and the base material sheet 1 as the support thereof is composed of a sheet made of a thermoplastic resin having a tensile strength of 140 to 210 MPa.

The kind of the thermoplastic resin constituting the base sheet 1 is not particularly limited, and examples thereof include polyolefin resins such as polyethylene and polypropylene, polyester resins such as polyethylene terephthalate, polybutylene terephthalate and polycarbonate, polyacrylonitrile, Acrylic resins such as polymethylmethacrylate, polystyrene, ABS resins and other styrene resins, polyvinyl chloride, polyvinylidene chloride, polyvinyl acetate and other vinyl resins, cellulose acetate, cellulose acetate propionate, and other fibrin derivatives. Conventionally known films or sheets made of various thermoplastic resins can be used.

However, in the present invention, it is important that the tensile strength of the base sheet 1 is within the range of 140 to 210 MPa. When the tensile strength exceeds 210 MPa, the base material sheet 1 cannot follow the fine irregularities on the surface of the transferred base material and cannot be deformed, and the transfer layer 2 remains on the transferred base material in the fine recesses. The transfer layer 2 is peeled off together with the base material sheet 1, or the transfer layer 2 is formed in a minute concave portion.
Is transferred in a bridging manner without being in close contact with the surface of the substrate to be transferred, which causes a poor adhesion and the like in which the transfer layer 2 in that portion is easily separated by a cellophane tape peeling test or the like. On the other hand, when the tensile strength is less than 140 MPa, the transfer sheet is apt to be wrinkled at the time of transfer, the transferability is deteriorated, and the base material sheet is easily broken at the time of peeling after the transfer.

In addition to the above-mentioned tensile strength, the substrate sheet 1 has solvent resistance for printing or coating the transfer layer 2 and heat resistance that does not melt or become sticky due to heating during transfer. Various characteristics such as dimensional stability that prevent distortion of the pattern due to dimensional changes during storage of the transfer sheet are also required. Considering these points together with the tensile strength, it is most preferable to use polyethylene terephthalate resin as the material of the substrate sheet 1 among the various thermoplastic resins described above.

As the film or sheet made of polyethylene terephthalate resin, a biaxially stretched film made of a homopolymer obtained by copolymerization of ethylene glycol and terephthalic acid is most representative, but a commercially available biaxially stretched polyethylene terephthalate film is a tensile film. Strength is 210
Many exceed MPa (typically 220-250MP
a)). Therefore, biaxial of a general homopolymer such as an unstretched or low-stretched film or a film made of a copolymerized polyethylene terephthalate resin obtained by copolymerizing diethylene glycol, 1,4-cyclohexanedimethanol, isophthalic acid, etc. It is necessary to select a film that is more flexible than the stretched film and has a tensile strength in the range of 140 to 210 MPa.

The surface of the substrate sheet 1 on which the transfer layer 2 is formed may be subjected to an appropriate means such as kneading or coating with a matting agent, sandblasting, brushing or embossing, if necessary. It may be matte.
Generally, in the transfer sheet, at least the surface on which the transfer layer 2 is formed is used for the purpose of improving the inking property of the printing ink or the coating material when forming the transfer layer 2 or providing the surface of the transfer layer 2 after the transfer with a matte finish. In many cases, the matte base sheet 1 is used, and in that case, due to the anchoring effect of fine irregularities on the matte surface, the base sheet 1 and the transfer layer 2 are heavily peeled off, resulting in transfer omission. And adhesion failure tends to occur.
However, according to the present invention, since the base material sheet 1 closely follows the fine irregularities on the surface of the transferred base material to bring the transfer layer 2 into close contact, the surface of the base material sheet 1 on which the transfer layer 2 is formed is matte. Even if it is formed into a shape, there is an advantage that good transfer can be performed without causing a transfer omission or a poor adhesion.

On the surface of the base sheet 1 on which the transfer layer 2 is formed,
If necessary, a release layer (not shown) made of a release material such as melamine resin or silicone resin may be formed. However, since the polyethylene terephthalate resin is relatively excellent in solvent resistance and has low surface tackiness, the transfer layer 2
In some cases, it is not necessary to form the release layer depending on the type of the binder and the solvent of the printing ink or the paint used for forming the layer.

The thickness of the base sheet 1 is not particularly limited in the present invention, but if it is too thin, the strength will be low and the base sheet 1 will easily break during the printing / coating process or the transfer process of the transfer layer 2. On the other hand, if it is too thick, the ability to follow fine irregularities on the surface of the transferred substrate deteriorates, causing transfer defects and poor adhesion, and increasing the heat capacity of the sheet, resulting in an increase in temperature during transfer. Generally, it is about 1 because it may cause transfer failure due to delay, increase in energy loss due to increase in heat amount required for heating, and decrease in productivity.
It is desirable that the thickness is about 0 to 100 μm.

A transfer layer 2 is provided on one side of the base material sheet 1 for transferring to the surface of the base material to be transferred. In order to achieve the object of the present invention, as the transfer layer 2, at least an adhesive layer 25 for adhering to the transfer-receiving substrate needs to be provided exposed on the side opposite to the side of the substrate sheet 1. However, regarding the constituent layers other than the adhesive layer 25, the order in which the layers made of any material are provided is not limited in the present invention, and is basically the same as the transfer layer in a conventional transfer sheet. The same structure can be used.

Specifically, as shown in FIG. 1, the protective layer 22, the pattern layer 23 and the adhesive layer 2 are arranged in this order from the side of the base sheet 1.
5, or a transfer layer 2 including five layers of a peeling layer 21, a protective layer 22, a pattern layer 23, a concealing solid layer 24, and an adhesive layer 25, as shown in FIG. A configuration including the above can be cited as a typical example.

Of course, the layers other than the adhesive layer 25, such as the protective layer 22 and the pattern layer 23, are not essential and can be omitted if necessary. For example, when the coating for surface protection is applied again after the transfer, the protective layer 22 can be omitted, and it is not necessary to add a pattern, and the protective layer 22 can be used as a transfer transfer sheet for transfer. The pattern layer 23 may be omitted.

The peeling layer 21 adjusts the weight of peeling of the transfer layer 2 from the base material sheet 1 within an appropriate range, and the base material sheet 1
It is provided in order to secure a stable releasability from the. Although the material is not particularly limited, for example, natural rubber derivatives such as chlorinated rubber and cyclized rubber,
Natural wax, wax such as synthetic wax, nitrocellulose, cellulose derivative such as cellulose acetate propionate, acrylic, polyurethane, polyamide, polyimide, polyester, polyacetal, chlorinated polyolefin, vinyl chloride- Thermoplastic resins such as vinyl acetate copolymer system, ethylene-vinyl acetate copolymer system, melamine-based, epoxy-based, polyurethane-based,
Examples of the release agent include a thermosetting resin such as a silicone type.

The protective layer 22 is provided to protect the pattern layer 23 and the like from external physical or chemical stimuli after transfer. The material is not particularly limited, for example, urethane resin, acrylic resin, aminoalkyd resin, melamine resin, phenol resin, unsaturated polyester resin, epoxy resin, silicone resin, etc. A curable resin, an ionizing radiation curable resin such as a (meth) acrylate resin, an unsaturated polyester resin, an epoxy resin, or the like is often used. However, even a thermoplastic resin, such as an acrylic resin, can be used depending on the application as long as it is a resin relatively excellent in surface hardness and solvent resistance.

The pattern layer 23 represents a desired design by printing or the like, and is a printing ink formed by dissolving or dispersing a coloring agent such as a dye or a pigment in a suitable solvent together with a suitable binder resin. It is generally provided by paint. The binder resin is not particularly limited, for example, urethane resin, acrylic resin, polyester resin, epoxy resin, phenol resin,
Modified vegetable oil, modified rosin, petroleum resin, vinyl chloride-vinyl acetate copolymer resin, polyvinyl butyral resin, fibrin derivative and the like can be preferably used.

The concealing solid layer 24 is provided for imparting to the transfer layer 2 a concealing property capable of concealing the color and defects of the surface of the transferred substrate, and the material thereof is a coloring agent such as titanium dioxide. It is almost the same as the printing ink or paint in the pattern layer 23, except that a large amount of pigments having high hiding properties such as zinc oxide, iron oxide, carbon black, metal powder, and pearlescent pigment are added. . The concealing property can be imparted by providing a metal vapor deposition layer instead of the concealing solid layer 24.

The adhesive layer 25 is provided for adhering the transfer layer 2 to the surface of the substrate to be transferred, and its material is, for example, a heat-sensitive adhesive or a pressure-sensitive adhesive (adhesive) depending on the adhesive mechanism used at the time of transfer. Agents, rewetting adhesives, thermosetting adhesives, ionizing radiation-curing adhesives, etc. can be used, but in general, they are activated by heat during transfer and develop adhesiveness, and after transfer A heat-sensitive adhesive, which has the property of solidifying and firmly adhering upon cooling, is often used. Examples of the heat-sensitive adhesive include ethylene-vinyl acetate copolymer resin, ethylene-ethyl acrylate copolymer resin, polyamide resin, polyester resin, polyolefin resin, polyurethane resin, polyvinyl ether resin,
A fibrin derivative or the like can be preferably used.

The method of forming each layer constituting the transfer layer 2 is not particularly limited, but is generally a printing method or a coating method. Examples of the printing method include gravure printing method, offset printing method, gravure offset printing method, dry offset printing method, screen printing method, flexographic printing method, letterpress printing method, transfer printing method, electrostatic printing method, electrophotographic method, inkjet printing. Examples of the coating method such as a gravure coating method, a microgravure coating method, a roll coating method,
A flow coating method, a spray coating method, a dip coating method, a knife coating method, an air knife coating method, a die coating method, a lip coating method, a comma coating method, a rod coating method, a kiss coating method and the like can be appropriately used.

The base material of the decorative material produced using the transfer sheet of the present invention, that is, the transfer target material is not particularly limited, and examples thereof include wood, plywood, laminated wood, single-plate laminated material, and orientation. Wooden base materials such as board, medium density fiber board, hard fiber board, particle board, calcium silicate board, wood wool cement board, asbestos cement board, slag cement board, slag gypsum board, glass fiber reinforced concrete board, lightweight foam The effect of the present invention is most effective when using a transfer base material having fine irregularities on the surface, such as an inorganic base material such as a concrete plate, a polyurethane foam, a polystyrene foam, a foamed polyethylene, a foamed resin molding such as a foamed polypropylene. Remarkably demonstrated.

[0030]

EXAMPLES The present invention will be described in more detail below by showing specific examples and comparative examples of the present invention.

Example 1 A substrate sheet having a tensile strength of 156.8 MPa (M
D: TD is almost the same) 25 μm thick biaxially stretched matte polyethylene terephthalate film (SKC, Skyrol SD25) is used, and one side thereof is
First, acrylic melamine resin (manufactured by Dainippon Ink and Chemicals, Inc., a mixture of TCM01 medium and matte medium)
To a thickness of 1 μm after drying and baking at a temperature of 200 ° C. to form a release layer. After that, a two-component curing type urethane resin (modified acrylic polyol compound (manufactured by Dainippon Ink and Chemicals, W- (327TR) 100 parts by weight and non-yellowing type isocyanate compound (manufactured by Dainippon Ink and Chemicals, Inc.,
W-A) blend with 10 parts by weight, diluting solvent: ethyl acetate / butanone = 1/1, solid content 20% by weight) is applied to a thickness of 6 μm after drying to form a protective layer, and then acrylic type A printing layer (TRC-906, manufactured by Dainippon Ink and Chemicals, Inc.) containing a resin as a binder resin is used to print and form a pattern layer, and finally, a polyamide resin 5 having an average molecular weight of 5000.
Polyamide resin 5 with 0 parts by weight and average molecular weight of 50,000 5
A polyamide resin-based heat-sensitive adhesive (TAK Dyne, manufactured by Dainichi Seika Kogyo Co., Ltd.) having a composition of 0 part by weight was applied to a thickness of 17 μm after drying to form an adhesive layer to produce a transfer sheet of the present invention. did.

Example 2 In Example 1 above, the base sheet has a tensile strength of 2
A biaxially stretched polyethylene terephthalate film having a thickness of 25 μm, which is 05.8 MPa (manufactured by Toyobo Ester, E
No. 5001) was used, and the other conditions were the same as in Example 1 above to produce a transfer sheet of the present invention.

Comparative Example 1 In Example 1 above, the base sheet has a tensile strength of 2
A biaxially stretched polyethylene terephthalate film (M310E12, manufactured by Diafoil Hoechst) having a thickness of 25.4 MPa and a thickness of 25 μm is used.
A transfer sheet was prepared under the same conditions as described above.

Comparative Example 2 In Example 1 above, the base sheet has a tensile strength of 1
A transfer sheet was formed under the same conditions as in Example 1 above, except that a biaxially oriented polypropylene film having a thickness of 37.2 MPa and a thickness of 25 μm (OPU-1 manufactured by Tocello Corp.) was used, and the formation of the release layer was omitted. It was made.

Transfer Test The above Examples 1 and 2 and Comparative Example 1,
Using the transfer sheet of No. 2, transferred to the surface of a commercially available medium density fiberboard under the same conditions with a commercially available roll heat transfer machine, and the transferability (visual evaluation) and the adhesion (cellophane tape peeling test)
When the followability to the uneven shape (visual evaluation) was evaluated, the results were as shown in the table below.

[0036] ◎: Excellent ○: Good △: Partially bad ×: Bad

The transferability of Comparative Example 2 was poor because the sheet was too soft and wrinkles were generated on the transfer sheet during transfer.

[0038]

As described in detail above, the transfer sheet of the present invention has a suitable flexibility because it adopts a base material sheet having a tensile strength of 140 to 210 MPa. Even when used for transfer to the surface of a transfer-target substrate having fine irregularities on its surface, such as or an inorganic base material,
At the time of transfer, the transfer sheet deforms following the fine irregularities on the surface of the substrate to be transferred, and has the function of pushing the transfer layer into the concave portions of the irregularities to bring them into close contact. It is possible to manufacture transfer-coated products such as cosmetic materials with good quality, in which transfer failure accidents such as peeling) are prevented and transfer layers with excellent adhesiveness are transfer-transfer formed. It plays.

[Brief description of drawings]

FIG. 1 is a side sectional view showing an embodiment of a transfer sheet of the present invention.

FIG. 2 is a side sectional view showing an embodiment of a transfer sheet of the present invention.

[Explanation of symbols]

1 Base sheet 2 Transfer layer 21 Release layer 22 Protective layer 23 picture layer 24 Concealed solid layer 25 Adhesive layer

   ─────────────────────────────────────────────────── ─── Continued front page    F term (reference) 3B005 EA02 EB01 EC30 FA18 FB01                       FB11 FB21 FB61 FE04 FE15                       FF00 FG04X GA04                 4F100 AK01A AK25 AK36 AK42A                       AK51 AS00C AS00D BA03                       BA04 BA07 CB00B GB07                       JB16A JK02A JN26A YY00A

Claims (5)

[Claims] 1. A transfer sheet having a transfer layer including at least an adhesive layer on a base sheet made of a thermoplastic resin, wherein the base sheet has a tensile strength of 140 to 210 MPa.
Is a transfer sheet. 2. The transfer sheet according to claim 1, wherein the base sheet is made of polyethylene terephthalate resin. 3. The transfer sheet according to claim 1, wherein the surface of the base sheet on the transfer layer side is matte. 4. The transfer layer includes at least one of a release layer, a protective layer, a pattern layer, and a concealing solid layer on the side of the base material sheet in addition to the adhesive layer. The transfer sheet according to 1. 5. A decorative material obtained by using the transfer sheet according to any one of claims 1 to 4 to transfer a transfer layer onto the surface of a transfer-receiving substrate having fine irregularities on the surface.