TW201323239A - Transfer printing sheet for transfer printing, and manufacturing method thereof - Google Patents

Abstract

The present invention provides a transfer printing sheet for transfer printing, and manufacturing method thereof, and provides a transfer printing sheet to enhance the ink receptivity, the performance of transfer printing to the printed article, and the adhesion to the substrate film, and almost without warping on transferring printing sheet. The transfer printing sheet for transfer printing is formed by laminating the silicone rubber sheet on one surface of the substrate film. Before laminating the silicone rubber sheet and the substrate film, the silicone rubber sheet is heated and made into sheets at the temperature above 100 DEG C in the open system. The transfer printing sheet for transfer printing has planarity. The planarity is that after laminating the substrate film and the silicone rubber sheet into 100mm square laminated sheet, it has protrusion at any one of the four corners less than 1mm.

Description

Transfer sheet for transfer and method of manufacturing the same

The present invention relates to a transfer transfer sheet and a method of producing the same.

Transfer is a printing technique in which printing is performed under conditions in which a printing plate forming a printed image is not in contact with a printed matter such as paper. The transfer is to temporarily transfer the ink from the printing plate onto the transfer sheet, and then the printed matter is printed by the transfer sheet. Since the transfer can produce the same printed matter in large quantities at a time, it has been widely used in the printing of paper media such as newspapers and magazines, and since it can be printed with relatively high precision, in addition to the above-mentioned fields, it has expanded in recent years. In the field of electronic components and so on.

The transfer sheet has a structure in which a printing layer is laminated on a substrate, and has a function of printing an ink from a printing plate on the printing layer. The main transfer sheet has a structure in which a ruthenium rubber having a uniform thickness is laminated on a base film made of polyethylene terephthalate. In the case of producing the transfer sheet having the above structure, a method of providing a base film inside the mold, injecting a liquid ruthenium rubber material from the upper surface of the base film, and integrally molding the base film at a normal temperature is used. (For example, refer to Patent Document 1).

Prior art literature

Patent Document 1: Japanese Laid-Open Patent Publication No. 2007-69412

However, the ruthenium rubber is solidified only in the mold, and the ruthenium rubber contains residues such as uncrosslinked low molecular siloxanes, and the crosslinking reaction of the ruthenium oxime rubber does not sufficiently proceed, and it can be said that The mechanical properties or chemical properties required for the printed layer of the transfer sheet are not sufficient. As a result, the ink absorbing property of the ink is lowered, and the transfer performance to the object to be printed is lowered, thereby causing dropping or deformation of characters or the like during printing.

Further, depending on the type of the ruthenium rubber, the adhesion to the base film such as polyethylene terephthalate is low, and peeling of the base film and the ruthenium rubber may occur during use. In order to improve the ink absorbing property of the ink, the transfer performance to the printed matter, and the adhesion to the substrate film, it is also conceivable to heat the transfer sheet to sufficiently crosslink the ruthenium rubber on the base film. The heat treatment causes the ruthenium rubber to shrink more than the base film to cause curling. As a result, in addition to the difficulty in attaching the transfer sheet to the transfer machine, it is difficult to perform high-precision printing.

The present invention has been made in view of the above problems, and it is an object of the invention to provide a transfer sheet which has improved ink absorbency of an ink, transfer performance to a printed matter, and adhesion to a substrate film, and which has almost no warpage. .

One mode of the present invention for achieving the above object is transfer transfer a printing sheet for laminating a ruthenium rubber sheet on one surface of a base film, wherein the ruthenium rubber sheet is 100 ° C or more in an open system before lamination with the base film The ruthenium rubber sheet is heat-treated and formed into a sheet, and the transfer sheet for transfer has planarity, and the flatness is made into a 100 mm square in a state in which the base film and the ruthenium rubber sheet are laminated. In the case of laminating, the amount of protrusion of any one of the four corners is 1 mm or less. Further, another aspect of the present invention is a transfer transfer sheet, wherein at least one of a bonding surface of the base film and the ruthenium rubber sheet is a modified surface which is ultraviolet light, corona, plasma A surface on which surface or excimer light is excited by surface excitation; or a surface modified by a decane coupling agent or a primer.

Further, another embodiment of the present invention is a transfer sheet for transfer, and the base film is made of any one of polyethylene terephthalate, polycarbonate, polymethyl methacrylate or polyimine. Composition.

One aspect of the present invention is a method for producing a transfer sheet for transfer, which is a method for producing a flat transfer sheet for transfer, which is a state in which a base film and a ruthenium rubber sheet are laminated. When the 100 mm square laminate is formed, the protrusion amount of any one of the four corners is 1 mm or less, and the manufacturing method includes the following steps: a molding step of curing the uncured rubber material in the mold. And molding into a rubber sheet; heat treatment step, in the open system at a temperature of 100 ° C or higher, the molding step The subsequent ruthenium rubber sheet is subjected to heat treatment; in the laminating step, the base material film and the ruthenium rubber sheet after the heat treatment step are laminated and bonded together.

Further, another aspect of the present invention is a method for producing a transfer transfer sheet, which further comprises a modification step of applying a substrate film and a heat treatment step before the laminating step At least one surface of the bonding surface of the rubber sheet is used as a modified surface, which is a surface modified by ultraviolet, corona, plasma or excimer light to excite the surface; or coupled by decane The surface to be modified with the agent or primer.

According to the present invention, it is possible to provide a transfer sheet which improves the ink absorbing property of the ink, the transfer performance to the printed matter, and the adhesion to the substrate film, and which has almost no warpage.

Next, preferred embodiments of the transfer transfer sheet of the present invention and a method for producing the same will be described.

1. Structure of transfer transfer sheet

The transfer sheet for transfer according to the embodiment of the present invention is formed by laminating a base film and a ruthenium rubber sheet.

(1) Substrate film

The base film constituting the transfer transfer sheet is a resin film, preferably polyethylene terephthalate (PET), polycarbonate (PC), or polymethyl. It is composed of methyl acrylate (PMMA) or polyimine (PI), and more preferably consists of PET which is a relatively inexpensive material which can obtain a film having a uniform thickness. The thickness of the base film is preferably 50 to 400 μm, and more preferably 150 to 300 μm.

(2) 矽 rubber sheet

The ruthenium rubber sheet constituting the transfer transfer sheet is a rubber-like sheet mainly composed of a siloxane chain (Si-O-Si), and the ruthenium rubber material in an uncured state is crosslinked. Here, the ruthenium rubber material is explained in a broad sense: in addition to the ruthenium rubber obtained by polymerizing only fluorenone, it also contains a modified fluorenone polymer obtained by copolymerizing an fluorenone and an organic monomer. The ruthenium rubber sheet is a sheet obtained by (vulcanizing) molding before laminating with a base film, and then heat-treating at a temperature of 100 ° C or higher in an open system. The molding temperature is appropriately changed depending on the type of the ruthenium rubber material. In order to increase the crosslinking ratio of the ruthenium rubber and remove the residue such as uncrosslinked low molecular siloxane, the heat treatment temperature is set to 100 ° C or higher in the open system.

In order to obtain a ruthenium rubber sheet having a uniform thickness, it is preferable to use a viscosity of 2500 Pa as measured by "viscosity measurement using a single cylinder rotary viscometer" according to JIS K7177. Liquid 矽 rubber material below s. However, in the case of using a pressurizing device or a calendering device capable of applying a high pressure, the state before use and the state before curing is natural rubber or synthetic. A rubber type that is similar to the unvulcanized rubber in the unvulcanized state.

(3) Planarity of the transfer sheet

The transfer sheet obtained by laminating the base film and the ruthenium rubber sheet has a flatness in which any one of the four corners has a flatness of about 1 mm or less. In other words, the transfer sheet has a flatness with respect to one side of the square transfer sheet in plan view, and the projection amount of any one of the four corners is 1% or less. When such a transfer sheet having a small warpage is used, it is easy to mount the transfer sheet on the transfer machine, and high-precision printing can be performed.

2. Method for producing transfer transfer sheet

FIG. 1 is a view showing an example of a manufacturing method of a transfer sheet for transfer according to an embodiment of the present invention. First, a room temperature curing type rubber material in an uncured state is supplied into a mold, and is solidified at room temperature to form a ruthenium rubber sheet (step S110: molding step). Next, the mold is opened, and the ruthenium rubber sheet is taken out from the mold, and the obtained ruthenium rubber sheet is heat-treated at a temperature of 100 ° C or higher in an open system (step S120: heat treatment step). Then, the surface of the substrate film prepared in advance and the heat-treated ruthenium rubber sheet are subjected to a modification treatment of surface excitation by ultraviolet rays, corona, plasma or excimer light (step S130: modification) step). Further, in the modification step, the surface of the base film may be subjected to a modification treatment by a decane coupling agent, a primer or the like. Then, on the substrate film and after heat treatment The silicone rubber sheets are laminated and bonded together (step S140: lamination step). In the modification step, when the modification treatment for exciting the surface is performed by ultraviolet rays, corona, plasma or excimer light, the bonding can be carried out at room temperature by hydrogen bonding in the laminating step. In addition, an adhesive can also be used at the time of bonding. Further, in the laminating step, a ruthenium rubber sheet may be placed on the base film after the modification treatment according to the required printing size, shape or position, and bonded to the base film.

3. The effect of the embodiment - the effect

As described above, since the base film and the ruthenium rubber sheet are integrated in a normal temperature environment, warpage is hardly generated even when two types of sheets having different linear expansion coefficients are bonded together. Further, unlike the conventional production method in which a liquid fluorenone material is supplied to a base film which is previously inserted into a mold and molded and cured at a normal temperature, the present embodiment is further passed through an open system after molding and solidification. The heat treatment is carried out to sufficiently cure the residue, and the residue is removed to produce a ruthenium rubber sheet, which is then bonded to the base film. Therefore, it is possible to eliminate the problem of poor adhesion of the two layers due to insufficient heating. In addition, by sufficiently curing and heat-treating the ruthenium rubber sheet, the residue is removed and bonded to the base film, whereby the characteristics of the ruthenium rubber which is very stable can be exhibited, and the ink absorbing performance of the ink and the transfer of the printed matter can be achieved. Printed layer with excellent printing performance and durability.

In addition, since the base film is not present when the rubber material is cured, Therefore, even a material such as a modified anthrone polymer which is originally difficult to be cured at a low temperature or a material which requires a special curing method can be used for transfer because it can be cured by a method compatible with the material. The structural material of the piece. Further, when a method of bonding a heat-treated ruthenium rubber sheet to a base film is used, it is not necessary to laminate a ruthenium rubber sheet having the same area as the base film on the base film, but At a desired position on the substrate film, a silicone rubber sheet having a desired shape or size is attached to have a degree of freedom. Therefore, the amount of the ruthenium rubber material can be optimized, and the resulting cost can be reduced.

4. Other implementations

Although the preferred embodiments of the transfer transfer sheet of the present invention and the method for producing the same have been described above, the present invention is not limited thereto, and various modifications can be made. For example, when the base film and the ruthenium rubber sheet are bonded together, any one of the bonding surfaces of the two can be modified by a decane coupling agent or a primer. Further, the ultraviolet surface treatment, the corona surface treatment, the plasma surface treatment, or the surface treatment using excimer light is preferably carried out on both the bonding surface of the base film and the bonding surface of the ruthenium rubber sheet, but It can also be performed on any one side. Moreover, it is also possible to perform the lamination step without performing the modification step at all.

Example

Embodiments of the invention are described below. However, the following examples are merely examples of the invention, and the invention is not limited by the examples.

Manufacturing conditions (Example 1)

A PET film of a model called Lumirror (thickness: 250 μm) manufactured by Toray Co., Ltd. can be used as the base film constituting the transfer sheet for transfer. As the material for the ruthenium rubber sheet, a ruthenium rubber material of a model called TSE3504 manufactured by Momentive Performance Materials Japan Co., Ltd. can be used. The above-mentioned tantalum rubber material was supplied into a mold which can be molded into a thickness of about 500 μm, and left at room temperature for 24 hours to mold the material. After molding, the mold was opened, and heat-treated in an oven at 150 ° C for 30 minutes, thereby obtaining a ruthenium rubber sheet. Then, the adhesive was interposed between the bonding faces of the silicone rubber sheet and the base film at 25 ° C to bond the two. Thus, a transfer sheet for transfer having a total thickness of about 700 μm and a square shape of 100 mm in plan view was produced.

(Example 2)

A transfer transfer sheet was produced under the same conditions as in Example 1 except that a ruthenium rubber material of a model number KE-1310ST manufactured by Shin-Etsu Chemical Co., Ltd. was used as the material for the ruthenium rubber sheet.

(Comparative Example 1)

A transfer sheet for transfer was produced under the same conditions as in Example 1 except that the heat treatment of the ruthenium rubber sheet was not performed.

(Comparative Example 2)

A transfer transfer sheet was produced under the same conditions as in Example 2 except that the heat treatment of the ruthenium rubber sheet was not performed.

(Comparative Example 3)

A transfer transfer sheet was produced under the same conditions as in Example 1 except that the enamel rubber sheet was subjected to heat treatment at 80 ° C for 30 minutes.

(Comparative Example 4)

In the mold which can be formed into a ruthenium rubber layer having a thickness of about 500 μm, the same base film as in Example 1 was applied, and the ruthenium rubber material used in Example 1 was supplied thereon, and the base was carried out at room temperature. Integrated molding of film and enamel rubber. Then, heat treatment was performed in an oven at 150 ° C for 30 minutes to produce a transfer transfer sheet.

2. Evaluation method

(1) Evaluation of the amount of protrusion The transfer sheets produced in the respective examples and the respective comparative examples were placed on a flat surface with the side of the enamel rubber sheet facing upward, and the amount of projection of the four corners from the plane was measured. And the maximum amount of protrusion is determined as the amount of protrusion of each transfer sheet.

(2) Evaluation of printing performance For printing ink, Fujikura was used. An ink of the model number FA-301CA manufactured by Kasei Co., Ltd. Various transfer sheets were mounted on the transfer machine and transferred. A PET film was used for the printed matter. The printing performance was evaluated by the method of performing printing 50 times, and at the 50th time, it was confirmed by a magnifying glass whether or not the thin line having a width of 30 μm can be clearly drawn. In the case where it can be clearly depicted, the evaluation is "○"; in the case where it is not clearly depicted, the evaluation is "X".

Table 1 shows the main production conditions and evaluation results of the transfer sheets for transfer produced in the respective examples and comparative examples.

As shown in Table 1, in the case of using the transfer sheets produced under the conditions of Examples 1 and 2, a highly planar transfer sheet each having a projection amount of 0.1 mm or less was obtained. In addition, even the 50th print, A fine line of 30 μm can be clearly drawn, and the printing performance is "○".

On the other hand, the transfer sheet produced by the conditions of Comparative Examples 1, 2, and 3 had a small amount of protrusion, but in the 50th printing, a fine line of 30 μm could not be clearly drawn, and the printing performance was "X". The transfer sheet produced by the conditions of Comparative Example 4 had a very large amount of protrusion, that is, 3 mm, and was difficult to mount on a transfer machine, and its printing performance was also "x".

Industrial Applicability The present invention can be used as a transfer sheet for transfer, for example, a blanket for offset printing.

FIG. 1 is a view showing an example of a manufacturing method of a transfer transfer sheet according to an embodiment of the present invention.

Claims (5)

A transfer transfer sheet which is obtained by laminating a ruthenium rubber sheet on one surface of a base film, wherein the ruthenium rubber sheet is in contact with the base film a sheet obtained by heat-treating at a temperature of 100 ° C or higher in an open system before lamination, the transfer sheet for transfer having planarity, after the base film and the tantalum rubber sheet are laminated When a 100 mm square laminate is produced in a state, the projection amount of any one of the four corners is 1 mm or less. The transfer transfer sheet according to claim 1, wherein at least one of the bonding surfaces of the base film and the ruthenium rubber sheet is a modified surface, and the modified surface is ultraviolet ray, A surface in which corona, plasma, or excimer light is excited by surface excitation; or a surface modified by a decane coupling agent or a primer. The transfer transfer sheet according to claim 1 or 2, wherein the substrate film is made of polyethylene terephthalate, polycarbonate, polymethyl methacrylate or polyphthalate. It is composed of any one of the amines. A method for producing a transfer printing sheet, which is a method for producing a transfer printing sheet having a flatness, which is formed into a 100 mm square in a state in which a base film and a ruthenium rubber sheet are laminated. When the laminate is laminated, the amount of protrusion of any one of the four corners is 1 mm or less. The manufacturing method is characterized in that it comprises the steps of: forming a step of solidifying an uncured rubber material in a mold and forming the ruthenium rubber sheet; and heating the step at a temperature of 100 ° C or higher in an open system, The ruthenium rubber sheet after the molding step is subjected to heat treatment; in the laminating step, the base material film and the ruthenium rubber sheet after the heat treatment step are laminated and bonded together. The method for producing a transfer transfer sheet according to claim 4, wherein the manufacturing method further comprises a modifying step of, before the laminating step, the substrate film and the substrate At least one of the bonding faces of the ruthenium rubber sheet after the heat treatment step is a modified surface which is a surface modified by ultraviolet, corona, plasma or excimer light to excite the surface. Or a surface modified by a decane coupling agent or a primer.