JP2944912B2 - Transfer sheet - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a transfer sheet capable of applying a pattern to an adherend (object) with one touch.

[0002]

2. Description of the Related Art A transfer sheet provided with a pressure-sensitive adhesive (adhesive) layer has the advantage of good workability since it can be attached to an adherend with one touch.

On the other hand, a transfer sheet provided with a thermosetting adhesive layer (in an uncured or incompletely cured state) or a pressure-sensitive adhesive (hot melt adhesive) layer has permanent adhesion to an adherend. There is an advantage that it can be achieved.

[0004]

Among the above transfer sheets, the transfer sheet provided with a pressure-sensitive adhesive layer has a limit in adhesive strength due to the properties of the pressure-sensitive adhesive, and it is difficult to re-attach the sheet at the time of sticking. In addition, there are problems such as that air is easily trapped at the time of sticking, it is difficult to expel the trapped air, and slipping (creeping) is likely to occur after sticking.

[0005] A transfer sheet provided with a thermosetting adhesive layer or a pressure-sensitive adhesive layer must be cured or heated in order to exert an adhesive force, and must be short when attached to an adherend. Pressure must be applied for such a long time, which is disadvantageous in terms of workability. That is, the one-touch property, which is an advantage of the transfer sheet, is impaired.

Although a transfer sheet provided with a moisture-curable adhesive layer is also conceivable, the usable time after manufacture is short and the peripheral part is quickly cured by moisture when attached to an adherend. Since the moisture hardly reaches the central part, there is a disadvantage that the number of days until the whole hardens becomes longer.

[0007] In view of such circumstances, the present invention can transfer to an adherend with one touch, can be re-attached, and can catch air when the pressure-sensitive adhesive resin layer is installed. To provide a transfer sheet that does not cause intrusion, and in the case of a moisture-curing type adhesive resin layer installation type, regardless of the moisture-curing type, provide it for several months to one year or more for distribution or storage period. To provide a transfer sheet that can be transferred to an adherend with a single touch, and that can achieve permanent adhesion in a short time to the center as well as the peripheral part due to the lapse of time due to leaving alone. It is the purpose.

[0008]

Means for Solving the Problems The transfer sheet of the present invention comprises:
Adhesive layer on release surface of release sheet (1) with releasability
In a transfer sheet having a configuration in which a main transfer layer (3) is provided via (2), the adhesive layer (2) is a lattice-shaped non-adhesive resin layer (21) and the non-adhesive Adhesive resin layer (22) filled in the gaps between the lattices of the mold resin layer (21),
The adhesive resin layer (22) is a pressure-sensitive adhesive resin layer (X) or a moisture-curable adhesive resin layer (Y).

Hereinafter, the present invention will be described in detail.

As the release sheet (1), a sheet obtained by treating at least one side of a plastic sheet with a release agent is preferably used. When moisture resistance is not so required, a paper obtained by treating the surface of a paper with a release agent can be used. As the release agent, a long-chain alkyl acrylate copolymer, a long-chain alkyl vinyl ester copolymer, a long-chain alkyl vinyl ether copolymer, a long-chain alkyl acrylamide copolymer, a long-chain alkyl allyl ester copolymer,
Copolymer of long chain alkyl derivative of maleic acid, long chain alkyl esterified polymer, long chain alkyl carbamate polymer, polyethyleneimine derivative, perfluorinated alkyl group-containing compound (including fluorine resin), silicone, fluorine Resins, paraffins, etc.
In particular, silicone is practical. In addition, a sheet in which the sheet itself is formed of a material having a releasing property, or a sheet in which a release agent is internally added at the time of sheet production can be used.

An adhesive layer (2) is provided on the release-retaining surface of the release sheet (1). This adhesive layer (2) is composed of a grid-like non-adhesive resin layer (21) and the non-adhesive resin layer (2).
And (1) an adhesive resin layer (22) filled in the gaps between the lattices.

Examples of the non-adhesive resin layer (21) include various resin layers such as an acrylic resin, a urethane resin, a polyester resin, and a polyvinyl chloride resin. It is carried out by volatilization of a solvent, heat curing, curing by reaction, curing by a catalyst, ultraviolet curing, moisture curing, and the like. The non-adhesive type resin layer (21) is formed in a grid pattern on the surface having release properties of the release sheet (1). The shape of the lattice is arbitrary, such as an orthogonal mesh, an oblique mesh, an irregular mesh, a parallel straight line, and a parallel wavy line.

As the adhesive resin layer (22), either a pressure-sensitive adhesive resin layer (X) or a moisture-curable adhesive resin layer (Y) is used.

The pressure-sensitive adhesive resin for forming the pressure-sensitive adhesive resin layer (X) includes an acrylic pressure-sensitive adhesive resin, a silicone pressure-sensitive adhesive resin, a rubber pressure-sensitive adhesive resin, and a vinyl-based pressure-sensitive adhesive resin. Examples thereof include a pressure-sensitive adhesive resin, a urethane-based pressure-sensitive adhesive resin, and a UV-curable pressure-sensitive adhesive resin, and an acrylic pressure-sensitive adhesive resin is particularly important. The acrylic pressure-sensitive adhesive resin is a soft component comprising an alkyl (meth) acrylate having about 4 to 12 carbon atoms such as butyl acrylate and 2-ethylhexyl acrylate, and an alkyl (meth) acrylate having a short-chain alkyl group. And a hard component such as vinyl acetate in an appropriate ratio, and a small amount of a functional group-containing monomer (such as an ethylenically unsaturated carboxylic acid) may be copolymerized.

Depending on the type of the pressure-sensitive adhesive resin, a tackifier or a softener may be used in combination. In addition, the pressure-sensitive adhesive resin, if necessary, an antioxidant, a filler, a vulcanizing agent,
A crosslinking agent, a coloring agent, an antifoaming agent, a leveling agent, and other additives can be added as long as the pressure-sensitive adhesiveness is not impaired.

As the moisture-curable adhesive resin for forming the moisture-curable adhesive resin layer (Y), a one-pack type polyurethane-based adhesive resin having an NCO group at a terminal, for example, a polyether polyol (polyoxypolyol) Polyols such as propylene diol, polytetramethylene glycol ether, polyoxyethylene diol) and polyester polyols (polyethylene adipate, polybutylene adipate, polyhexamethylene adipate, polycaprolactone, etc.) are terminated with polyols such as tolylene diisocyanate and diphenylmethane diisocyanate. A resin obtained by reacting an isocyanate compound is preferably used. It may have a urethane bond in the middle of the molecule. In addition, a silicone resin having moisture curability, an acrylic resin to which a substance which is made alkaline by moisture can be used.

The above-mentioned pressure-sensitive adhesive resin or moisture-curable adhesive resin is usually a hydrocarbon, ester, ether, ketone, alcohol, nitrogen-containing solvent, sulfur-containing solvent, halogen-containing solvent, two or more functional groups ( Ester group, ether group, etc.) solvent, such as water, or a mixed solvent of these is dissolved or finely dispersed in the form of printing or coating. In some cases, no solvent is used.

In order to form the adhesive layer (2) on the release-retaining surface of the release sheet (1), first, a non-adhesive resin layer (21) is formed on the release sheet (1) in a lattice shape, The gap between the lattices may be filled with the adhesive resin layer (22). Adhesive resin layer (2
At the time of filling in 2), in addition to the method of providing the adhesive resin layer (22) only in the space between the lattices of the non-adhesive resin layer (21) (see FIG. 1 (c) described later), Adhesive resin layer (22) from above the non-adhesive resin layer (21) together with the gap between the lattices
(See FIG. 2 (c) to be described later).

A main transfer layer (3) is provided on the sticking layer (2), and a protective sheet is provided on the main transfer layer (3) if necessary.
(4) is covered, which will be described later.

The transfer sheet of the present invention is of a type in which an adhesive layer (2) and a main transfer layer (3) are formed over a wide area on a release sheet (1) and cut or punched out. However, it is assumed that the adhesive layer (2) and the main transfer layer (3) are formed by a pattern forming method by screen printing, and the protective sheet (4) is covered over the main transfer layer (3). Since this is particularly desirable, a typical method of making a transfer sheet for this type will be described in detail below.

First, an adhesive layer (2) is pattern-printed on the release-retaining surface of the release sheet (1) by screen printing.
When printing the pattern, first use the non-adhesive resin layer (2
1) is printed in a grid pattern, and then printed so that the gap between the grids is filled with the adhesive resin layer (22). In order to secure a predetermined thickness, the non-adhesive resin layer (21) and / or the adhesive resin layer (22) may be formed by printing a plurality of times. The non-adhesive resin layer (2
1) When printing the adhesive resin layer (22) by printing, the printed surface may repel, or it may be difficult to form an accurate pattern even if it does not repel. It is desirable to mix a small amount or a small amount of a substance having a surface active action such as a surfactant and other surfactants in the resin liquid for forming each layer.

After the adhesive layer (2) is formed on the release sheet (1) by pattern printing, the adhesive layer (2) is simply screen-printed so as to draw substantially the same pattern as that of the adhesive layer (2). A main transfer layer (3) of a single layer or multiple layers is formed. Examples of the ink in this case include a colorant-free ink (clear ink), a colorant-containing ink, an active energy ray (ultraviolet ray or electron beam) curable ink, and functional properties (conductivity, temperature display, fluorescence, luminous properties, Reflective, aromatic, magnetic) inks,
Any type of ink can be used. A vapor deposition layer, a plating layer, a transfer layer using a transfer foil, and the like can be added on or in the middle of the main transfer layer (3).

When the above-mentioned adhesive layer (2) is a moisture-curable adhesive resin layer (Y), if moisture is present during the storage or distribution process, the moisture-curable adhesive resin is cured and adheres. After the main transfer layer (3) is formed, it is necessary to cover the protective sheet (4) having moisture resistance so as to cover a larger area than the pattern. The protective sheet (4) is also convenient for the transfer operation to the adherend. In consideration of transfer operability, the protective sheet (4) has a main transfer layer so that it can be peeled off during the transfer operation to the adherend.
It is usual to use a material having low tackiness to (3). Even when the above-mentioned adhesive layer (2) is a pressure-sensitive adhesive resin layer (X), a protective sheet (4) is usually provided for a transfer operation to an adherend.

The protective sheet (4) includes polyolefin, polyvinyl chloride, polyester, polyamide,
Polyurethane, polyimide, cellulosic derivatives, various films or sheets including polyacetal, the surface of which is subjected to a coating treatment showing a slight adhesive force if necessary, or a part thereof is preferably used. However, other materials may be used. A plurality of protective sheets (4) can be stacked to strengthen the waist. The protection sheet (4) can also be formed by printing.

If a sheet having moisture permeability is used as the release sheet (1) and a sheet having moisture resistance is used as the protective sheet (4), the above-mentioned adhesive layer (2) and main transfer layer
(3) is sandwiched between the release sheet (1) and the protective sheet (4), and the non-hygroscopic state is maintained.

The transfer printing sheet described above has the following properties: (1) / (2) /
(3) / (4), and each layer is usually formed sequentially from the side of (1) as described above (this method is industrially advantageous). It suffices that this layer configuration is finally formed, and the formation order is not necessarily limited. For example, first, the main transfer layer (3) is formed on the protective sheet (4), then the adhesive layer (2) is formed on the main transfer layer (3), and finally, the adhesive layer (2) is formed. Release sheet from
(1) can be overlaid.

In order to facilitate the transfer operation on the adherend, the adhesion between the release sheet (1) and the adhesive layer (2) is set to the minimum, and the main transfer layer (3) and the protective sheet (4) are set. ) Is set at an intermediate level, and attention is paid so that the adhesion between the adhesive layer (2) and the adherend is maximized.

Since the adhesive layer (2) has tackiness or tackiness, the adherend is made of metal, plastics, rubber, painted surface, wood and bamboo, ceramics, paper, woven fabric, non-woven fabric, leather,
Any material such as ceramic and other organic or inorganic surfaces can be used.

In the transfer operation, first, the protective sheet (4) is gripped by a finger or a jig and turned over to form an adhesive layer (2).
Release sheet for laminate of / Main transfer layer (3) / Protective sheet (4)
It is sufficient to peel off the adhesive sheet from (1), and then press the adhesive layer (2) side of the laminate against the adherend to hold it down, and then peel off only the protective sheet (4).

[0030]

In the transfer sheet of the present invention, the adhesive layer (2)
Is a lattice-shaped non-adhesive resin layer (21), the adhesive resin layer (22) filled in the gap between the lattices of the non-adhesive resin layer (21)
It is composed of

Of these, the non-adhesive resin layer (21) comes into contact with the adherend but does not adhere to it when it is adhered to the adherend. Becomes Since the non-adhesive type resin layer (21) is formed in a lattice shape, air can enter into or exit from the interior even when the area of application is large.

On the other hand, the adhesive resin layer (2) of the adhesive layer (2)
2) has adhesive properties, so the adhesive layer (2) / main transfer layer
The transfer piece consisting of (3) is attached to various adherends with one touch without selecting the material.

When the adhesive resin layer (22) of the adhesive layer (2) is a pressure-sensitive adhesive resin layer (X) (case 1), the above-mentioned grid-like non-adhesive resin layer (21) is used. Mainly plays a role of an air bleeding path at the time of sticking, and also plays a role of adjusting adhesive strength.

When the adhesive resin layer (22) of the adhesive layer (2) is a moisture-curable adhesive resin layer (Y) (case 2), the lattice-like non-adhesive resin layer (21) is used. ) Plays the role of an air vent path at the time of sticking, and also serves as an introduction path through which moisture necessary for prompt curing of the moisture-curable adhesive resin layer (Y) enters.
In other words, the adhesive resin layer (22) of the adhesive layer (2) only comes into contact with air during the operation of attaching to the adherend, and after that, it starts to cure even when it is adhered to the adherend. Above, the curing is quickly achieved by the moisture in the air supplied through the grid-like non-adhesive resin layer (21).

The release sheet (1) plays a role of releasably supporting the transfer piece composed of the adhesive layer (2) and the main transfer layer (3).

The main transfer layer (3) gives a necessary display or function to the adherend.

The protective sheet (4) plays a role of facilitating the transfer operation to the adherend, and in the case 2, also plays a role of effectively preventing natural curing of the moisture-curable adhesive resin before use. Use a release sheet (1) such as a polyester sheet that has moisture resistance, such as a polyester sheet.
(4) If a material having moisture permeability is used, the curing of the moisture-curable adhesive resin can be prevented in the case 2 for several months to one year or more.

[0038]

Next, the present invention will be described in more detail with reference to examples. Hereinafter, "%" is% by weight.

Example 1 FIG. 1 is a cut end view schematically showing an example of a method for producing a transfer sheet of the present invention.

Release sheet (1) obtained by subjecting one side of a 125 μm-thick polyester sheet to a release treatment with silicone.
First, a solution of an acrylic urethane-based two-pack type curable resin is screen-printed on the surface having the releasability, and then cured by heating and drying to obtain a predetermined pattern.
A non-adhesive resin layer (21) having a fine pattern in the shape of a gobang having a side of 2 mm and a line width of 0.4 mm was formed.

On the other hand, a pressure-sensitive adhesive resin solution having a resin content of 40% and a viscosity of 5000 cps / 25 ° C. made of an n-butyl acrylate / vinyl acetate (7: 3 by weight) copolymer was prepared. From the top of the pattern of the non-adhesive resin layer (21) formed in the above, a fine pattern corresponding to the gap between the lattices of the non-adhesive resin layer (21) and as a whole draw the same pattern as that Screen printed and pre-dried. Thus, the adhesive layer (2) was formed in which the adhesive resin layer (22) was filled in the gaps between the lattices of the non-adhesive resin layer (21).

Next, an ink layer, such as a clear ink layer or a colored ink layer, is screen-printed on the adhesive layer (2) exactly over the pattern, and the main transfer layer (3)
And finally dried sufficiently in a dryer.

Next, a protective sheet made of a polyvinyl chloride film having a weakly adhesive layer is formed on the main transfer layer (3).
(4) was stacked and pressed between rubber rollers, and another protective sheet (4) was further stacked and pressed on the rubber sheet for reinforcement. As a result, a transfer sheet having the layer configuration of (1) / (2) / (3) / (4) was obtained.
Half cut was performed between the patterns from the side of (4).

By gripping the end of the protective sheet (4) of the transfer sheet thus obtained with a finger and turning it over, the adhesive layer (2) / main transfer layer (3) / protective sheet (4) can be used. The laminate is peeled off from the release sheet (1), and then the adhesive layer of the laminate is removed.
(2) After touching the side to the adherend and pressing it down with a finger several times, the protective sheet (4) was gently peeled off and removed.
Only the pattern consisting of the transfer layer having the layer structure of (2) / (3) remained, and the transfer was completed with one touch. The air that bites in at the time of sticking could be easily pushed out. Also, it was easy to re-apply at the beginning of application.

COMPARATIVE EXAMPLE 1 A printing layer containing only the pressure-sensitive adhesive resin solution used in Example 1 was formed on a release sheet (1), and a main transfer layer ( 3) After forming the protective sheet (4)
Was provided. However, the transfer sheet obtained in this manner is liable to cause air bite when attached to an adherend,
Moreover, it has been difficult to extract the air that has been caught.

Example 2 FIG. 2 is a cut end view schematically showing another example of the method for producing the transfer sheet of the present invention.

After forming a non-adhesive resin layer (21) having a predetermined pattern and a fine pattern like a goblet pattern in the same manner as in Example 1, the same pressure-sensitive adhesive resin as in Example 1 was used. Example 1 was repeated except that the solution was screen-printed on the pattern of the non-adhesive resin layer (21) formed above so as to draw the same overall pattern as the non-adhesive resin layer (21). . In this case, almost the same preferable results as in Example 1 were obtained.

Example 3 In the same manner as in Example 1, a release sheet (1) obtained by subjecting one side of a polyester sheet having a thickness of 125 μm to a release treatment with silicone was first placed on an acrylic urethane-based two-part liquid. Non-adhesive resin having a predetermined pattern, a 2 mm side, and a 0.4 mm line width, which has a predetermined pattern and is hardened by screen drying and then drying by heating and drying a solution of a mold curable resin. A layer (21) was formed.

On the other hand, resin content 50%, viscosity 1000 cps / 25
C. A urethane-based moisture-curable adhesive resin solution at a temperature of .degree. C. was prepared, and this solution was applied to the lattice of the non-adhesive resin layer (21) from above the pattern of the non-adhesive resin layer (21) formed above. Was screen-printed so as to draw a fine pattern corresponding to the gap and the same pattern as a whole, followed by preliminary drying. Thus, the adhesive layer (2) was formed in which the adhesive resin layer (22) was filled in the gaps between the lattices of the non-adhesive resin layer (21).

Next, an ink layer such as a clear ink layer or a colored ink layer is screen-printed on the adhesive layer (2) exactly over the pattern, and the main transfer layer (3)
And finally dried sufficiently in a dryer.

Next, a protective sheet made of a polyvinyl chloride film having a weakly adhesive layer is formed on the main transfer layer (3).
(4) was stacked and pressed between rubber rollers, and another protective sheet (4) was further stacked and pressed on the rubber sheet for reinforcement. As a result, a transfer sheet having the layer configuration of (1) / (2) / (3) / (4) was obtained.
Half cut was performed between the patterns from the side of (4). The transfer sheet thus obtained can be used even if left for several months, and can be stored for more than half a year or for more than one year if stored in a moisture-proof bag.

The end of the protective sheet (4) of the transfer sheet obtained in this manner is gripped with a finger and turned up, thereby forming the adhesive layer (2) / main transfer layer (3) / protective sheet (4). The laminate is peeled off from the release sheet (1), and then the adhesive layer of the laminate is removed.
(2) Touch the side to the adherend and press it down with your finger several times, then hold it down for a while, and then gently
When (4) was peeled off, only the pattern consisting of the transfer layer (2) / (3) remained on the adherend, and the transfer was completed with one touch. The air caught at the time of sticking could be easily pushed out, and the sticking was easy.

In order to observe the change over time, a large number of such transfer operations were performed on various adherends (stainless steel plate, polyester sheet, hard polyvinyl chloride plate, polymethyl methacrylate plate, polystyrene plate, urethane-coated ABS plate). The adherend to which the transfer was performed was allowed to stand in a room and subjected to a peel test every five days every five days. When observing the peeling state at the time of measuring the peeling strength, 1
After a lapse of days, the adhesion was still insufficient, but thereafter it was found that the adhesion was practically due to adhesion.

Example 4 After forming a non-adhesive resin layer (21) having a predetermined pattern and a fine pattern having a gobang pattern in the same manner as in Example 3, the same moisture curing as in Example 3 was performed. Example 1 except that the mold adhesive resin solution was screen-printed on the pattern of the non-adhesive resin layer (21) formed above so as to draw the same overall pattern as the non-adhesive resin layer (21). 3 was repeated. In this case, almost the same preferable results as in Example 3 were obtained.

[0055]

According to the transfer sheet of the present invention, in the case of the pressure-sensitive adhesive resin layer installation type, it can be transferred to the adherend with one touch, can be re-attached, and the air No biting occurs. In the case of a moisture-curable adhesive resin layer installation type, regardless of the moisture-curable type, it can be used for a distribution or storage period of several months to one year or more, and transfer to the adherend is one-touch. In addition, permanent adhesion can be achieved in a short period of time not only at the peripheral part but also at the central part by the lapse of time simply by leaving the apparatus unattended.

[Brief description of the drawings]

FIG. 1 is a cut end view schematically showing an example of a method for producing a transfer sheet of the present invention.

FIG. 2 is a cross-sectional end view schematically showing another example of a method for producing a transfer sheet of the present invention.

[Explanation of symbols]

 (1) ... release sheet, (2) ... adhesive layer, (21) ... non-adhesive resin layer, (22) ... adhesive resin layer, (3) ... main transfer layer, (4) ... protective sheet

Claims (3)

(57) [Claims] 1. A transfer sheet having a configuration in which a main transfer layer (3) is provided on a release-retaining surface of a release sheet (1) having a release property via an adhesive layer (2). The adhesion layer (2) is composed of a lattice-shaped non-adhesive resin layer (21) and the non-adhesive resin layer.
(21) and an adhesive resin layer (22) filled in the gap between the lattices, and the adhesive resin layer (22) is a pressure-sensitive adhesive resin layer (X) or a moisture-curable adhesive layer. A transfer sheet, which is a resin layer (Y). 2. The transfer sheet according to claim 1, wherein a protective sheet releasable from the main transfer layer is covered. 3. An adhesive layer (2) is a pattern printing layer, and a main transfer layer (3) is formed on the adhesive layer (2) so as to draw substantially the same pattern. A releasable protective sheet (4) that is a layer or multilayer pattern printing layer and covers an area larger than the pattern from above the main transfer layer (3)
The transfer sheet according to claim 1, wherein the transfer sheet is covered.