JP3158766B2 - Release film for transfer printing - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a release film used for transfer printing.

[0002]

2. Description of the Related Art Conventionally, a printing method called a transfer method has been adopted when multicolor printing or photographic printing is required for a plastic molded product or the like. This transfer method uses a transfer paper that is printed on a release paper or a plastic release film that has releasability by a normal method, and furthermore, a transfer paper coated with a heat-sensitive adhesive on the printed material. Printing is performed by transferring printing ink from paper to the printing medium when the printing medium surfaces are overlapped and pressed by a hot roll or the like.

[0003] However, in the case of release paper using paper, the dimensional change due to humidity is large. Therefore, when performing multicolor printing, printing is performed several times by screen printing or the like. At this time, misregistration often occurs. . In addition, since the release paper itself has no transparency, there is a problem that it is difficult to position the transfer paper when transferring.

On the other hand, in the case of a release film using a plastic film, transfer paper on which ink is printed may be overlaid,
When wound up, the adhesive layer applied on the ink to be transferred and the back surface of the film on which the ink is not printed are liable to cause blocking, and therefore, a release treatment was performed with a silicone release agent or the like. There has been a problem that the interleaf has to be sandwiched, resulting in an increase in cost.

The present invention has been made in view of the above circumstances, and has as its object to provide a release film for transfer printing which has good dimensional stability, is transparent, and hardly causes a blocking phenomenon.

[0006]

According to the present invention, in order to achieve the above object, a release layer capable of printing and transferring ink is formed on one surface of a transparent polyester base film, Forming a transparent coating mat layer in which inorganic fine particles are dispersed and compounded on the other side of the above, and further forming a silicone-based release agent layer on the coating mat layer. Provide a film.

In this case, it is preferable to form an antistatic agent layer between the coating mat layer and the silicone release agent layer.

It is preferable that the release layer is formed on the substrate film via the coating mat layer.

[0009]

The release film for transfer printing of the present invention uses a polyester film as a base material, has good dimensional stability, and is capable of printing and transferring ink on one surface of the base film. Since the layer has been formed, general transfer printing is possible.Also, a transparent polyester film is used, and since a transparent coating mat layer is formed, it has transparency, and is used for transfer printing. Positioning is easy. Furthermore, since a coating mat layer formed by dispersing and blending inorganic fine particles is formed on the other surface (back surface) of the base film, the surface opposite to the surface on which the ink is printed becomes rough, and the contact area is reduced due to the surface roughening, thereby releasing the mold. It effectively prevents blocking with the adhesive layer formed on the printing ink printed on the layer, and furthermore, since a silicone-based release agent layer is further formed on this coating mat layer, it is combined with surface roughening. Further, the blocking phenomenon can be effectively prevented.

Further, by forming an antistatic agent layer between the coating mat layer and the silicone-based release agent layer, the generation of static electricity can be prevented, and troubles due to static electricity may occur when printing the ink layer. This is advantageous because it is possible to prevent such a problem that the base films adhere to each other and hinder continuous printing on the base film.

Further, by forming the release layer on the base film via the coating mat layer, the release layer has a matte tone, so that the ink layer printed on the release layer is transferred. At this time, the surface corresponding to the front side can also be made to have a matte tone, which is effective when transferring a matte printing surface.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS. FIG. 1 is a sectional view showing one embodiment of the release film for transfer printing of the present invention. The release film 1 for transfer printing has a release layer 3 formed on one surface side of the polyester base film 2, and the release layer 3 enables printing and transfer of transfer ink. On the other side of the base film 2, a coating mat layer 4 in which inorganic fine particles are dispersed and mixed is formed, and on this coating mat layer 4, an antistatic agent layer 5 and a silicone-based release agent layer 6 are sequentially formed. It is formed.

Here, the material of the base film 2 uses a transparent polyester such as polyethylene terephthalate, which can impart transparency to the base film. The thickness of the base film is preferably in the range of 50 to 125 μm as in general transfer.

The release layer 3 enables transfer ink and transfer. For this purpose, a silicone resin, an amide resin, an alkyd resin, etc., which are generally used for transfer paper, can be used. A range of 0.2 to 0.6 μm is preferred.

The coating matting agent layer 4 is for roughening the back surface of the base film 2, and is formed on the printing ink printed on the release layer 3 by forming a matting surface in this way. Contact area with the adhesive layer
Blocking is prevented. For this purpose, for example, it is preferable to use an acrylic binder in which inorganic particles such as silicon dioxide fine particles are dispersed in order to ensure transparency. In this case, the particle size of the inorganic fine particles is 0.1 to 2
It is effective that the content of the inorganic fine particles is in the range of 2 to 45% by weight. The thickness of the coating mat layer is
The range of 0.1 to 25 μm is good.

The antistatic agent layer 5 on the coating mat layer 4 is formed by applying a normal antistatic agent, and is for preventing generation of static electricity. As a result, the polyester base film 2 is liable to generate static electricity, which causes problems such as static electricity trouble during printing, and the problem that continuous screen printing by an automatic machine is difficult due to the sticking of several films due to static electricity. Can be solved. Such an antistatic agent layer 5 is preferably formed of a cationic antistatic agent. The thickness of the antistatic agent layer 5 is 0.01 to 12
The range of μm is preferred.

The silicone-based release agent layer 6 is for further enhancing the anti-blocking effect due to the roughening of the coating mat layer 4 described above, and is generally known as a silicone release agent or silicone for release paper. These can be used, and the coating amount may be the same as in these applications. However, generally, an amount having a thickness in the range of 0.2 to 0.5 μm is preferable.

When the transfer release film 1 of the present embodiment is used, as shown in FIG. 2, a transfer ink is printed on the release layer 3 by an ordinary printing method to form an ink layer 7, and furthermore, An adhesive is applied on the ink layer 7 to form the adhesive layer 8, and the transfer paper 9 can be formed. Then, according to a normal method, the adhesive layer 8 of the transfer paper 9 is applied to the surface of the printing medium, and heating and pressing with a heat roll or the like are applied from the base film 2 side, whereby the ink layer 7 and the adhesive layer 8 is the release layer 3
And the ink layer 7 is transferred to the surface of the printing medium via the adhesive layer 8.

In this case, according to the release film 1 for transfer printing of the present embodiment, the base film 2 has transparency, and the coating mat layer does not impair the transparency of the base film. In this case, positioning is easy.
Further, a coating mat layer 4 is formed on the back surface of the base film 2.
And the silicone-based release agent layer 6 are formed, so that the back surface of the base film 2 is roughened and has release properties. Therefore, even when the transfer papers 9 are stacked or wound up, Blocking with the adhesive layer 8 is prevented, and there is no need to insert a slip sheet between transfer sheets as in the related art. Further, since the antistatic agent layer 5 is interposed between the coating mat layer 4 and the silicone release agent layer 6,
The generation of static electricity can be prevented, and when printing the ink layer 7, it is possible to effectively prevent troubles caused by static electricity and troubles such as sticking of the base film 2 and impairing continuous printing. In addition, the release film 1 for transfer printing of the present embodiment.
In this case, since the surface of the base film 2 on which the ink layer 7 is formed is smooth, the transferred ink layer 7 has a glossy tone.

FIG. 3 shows a release film 1 for transfer printing of the present invention.
In this embodiment, the release film 1 for transfer printing has a back surface of a base film 2 similar to that of FIG. 1 except that a release layer 3 has a second coating mat layer 4 ′. Since the surface of the ink layer 7 to be transferred can be roughened to have a matte tone by forming the second coating mat layer 4 ′,
It can be used when the transferred ink layer has a matte tone.

Although not shown, the transfer printing release film of the present invention may have a protective layer which is further transferred onto the release layer 3 together with the ink layer 7 to protect the ink layer 7. The protective layer may be made of an epoxy resin, a melamine resin, an acrylic resin, or the like.

[Experimental Example] A coating mat layer having a thickness of 6 μm was applied on both sides of a transparent polyester film having a thickness of 75 μm. This coating mat layer is composed of a liquid acrylic base material and silicon dioxide fine powder having an average particle size of 20 μm.
A mixture containing 4% by weight was used.

Next, an amino alkyd type release agent was applied to one of the coating mat layers to form a release layer having a thickness of 0.4 μm. Further, the other coating mat layer was coated with an addition-polymerization type silicone release agent to have a thickness of 0.2 mm.
A μm silicone release agent layer was formed, and a release film for transfer printing as shown in FIG. 4 was prepared.

Printing is performed on the release layer of the release film to form an ink layer, and an adhesive is applied on the ink layer to form an adhesive layer. The paper has transparency and is easy to be positioned at the time of transfer, and does not cause blocking between the adhesive layer and the back surface of the transfer paper (the side on which the silicone-based release agent layer is formed). The transferred printing surface was matte.

[0025]

According to the release film for transfer printing of the present invention, since it has transparency, positioning at the time of transfer printing is easy and the occurrence of a blocking phenomenon can be effectively prevented.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view showing one embodiment of a release film for transfer printing of the present invention.

FIG. 2 is a cross-sectional view showing a transfer paper on which a transfer ink and an adhesive layer are formed in the same example.

FIG. 3 is a sectional view showing another embodiment of the release film for transfer printing of the present invention.

FIG. 4 is a cross-sectional view showing a release film for transfer printing of the present invention used in an experimental example.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 release film for transfer printing 2 substrate film 3 release layer 4 coating mat layer 5 antistatic agent layer 6 silicone release agent layer 7 transfer ink layer 8 adhesive layer 9 transfer paper

Claims (3)

(57) [Claims] 1. A release layer capable of printing and transferring ink is formed on one surface of a transparent polyester base film,
Forming a transparent coating mat layer formed by dispersing and blending inorganic fine particles on the other surface of the base film, and further forming a silicone release agent layer on the coating mat layer; Release film for printing. 2. The release film for transfer printing according to claim 1, wherein an antistatic agent layer is formed between the coating mat layer and the silicone-based release agent layer. 3. The release film for transfer printing according to claim 1, wherein a release layer is formed on the surface of the substrate film via a coating mat layer.