JP2514906B2 - Heat 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 heat transfer sheet used for applying a pattern or the like to an adherend such as an automobile or a motorcycle.

[0002]

2. Description of the Related Art For example, characters such as automobiles, motorcycles, and vending machines are provided with patterns such as letters and illustrations.
Mostly due to transfer marks that are heat-transferred by a transfer sheet).

This transfer sheet includes a mount, a transfer ink layer,
It is equipped with a protective film layer, for example
As described in Japanese Patent Application No. 073, for example, a water-soluble glue layer is formed on one surface of the mount, and a transfer ink layer and a protective film layer are formed via this water-soluble glue layer.

With this transfer sheet, a transfer mark is transferred to an adherend as follows. First, the entire transfer sheet is immersed in water or a water-containing solvent to semi-dissolve the water-soluble glue layer, and the mount is peeled off. After that, the transfer ink layer is pressure-bonded to the adherend and heated at a temperature of about 60 ° C. to 100 ° C. to cure the transfer ink layer to form a transfer mark, and then the uppermost protective film layer is peeled off and transferred. To complete.

[0005]

By the way, in recent years, it has been desired to apply a fluorescent color pattern or the like to an adherend used outdoors such as an automobile or a motorcycle. A transfer sheet for a fluorescent color pattern has been conventionally known, and a fluorescent pigment is mixed in the transfer ink layer. However, since this fluorescent pigment has a property of being easily decomposed by ultraviolet rays, if the transfer mark containing the fluorescent pigment is transferred to an adherend used outdoors, and the transfer mark is exposed to sunlight, There is a problem that the fluorescent color of the transfer mark is significantly faded due to the decomposition of the fluorescent pigment in the transferred transfer mark, and the appearance of the adherend is significantly impaired.

Therefore, an object of the present invention is to provide a transfer mark whose fading is difficult to recognize even when the fluorescent pigment in the transfer mark is fading.

[0007]

To solve the above object, according to an aspect of the present invention comprises a substrate sheet, the transfer ink layer, and a protective film layer possess in this order, peeling the said base sheet
After applying to the adherend and heat bonding, the protective film layer is applied.
A heat transfer sheet that peels off and transfers the transfer ink layer to the adherend.
The transfer ink layer, from the substrate sheet side,
A white ink layer, a fluorescent color retaining pseudo ink layer, a fluorescent ink layer, a clear ink layer are formed in this order in the respective layers having the same shape .
And fluorescent pigments are mixed, the fluorescent color retention pseudo ink layer, and the pigment is mixed is a color substantially the same color or same type color excluding the fluorescence effect from the color of the fluorescent pigment, before
UV absorber is not mixed in the clear ink layer.
It is characterized in that that.

[0008]

In the transfer sheet according to the present invention, a fluorescent color retaining pseudo ink layer (hereinafter referred to as a pseudo ink layer) is formed between the white ink layer and the fluorescent ink layer. In this pseudo ink layer, a pigment having a color substantially the same as or a color similar to the color obtained by removing the fluorescent effect from the color of the fluorescent pigment mixed in the fluorescent ink layer is mixed.

The fluorescent pigment mixed in the fluorescent ink layer easily fades when exposed to sunlight outdoors, but the colored pigment mixed in the pseudo ink layer shows such a tendency. Absent. Therefore, even if the fading of the fluorescent pigment in the fluorescent ink layer progresses, the color of the pseudo ink layer appears in the part where the fading progresses. Therefore, when a transfer mark is applied to an adherend used outdoors,
Even if the fluorescent pigment in the fluorescent ink layer is discolored, the discoloration is not noticeable and the appearance can be kept in a beautiful state.

Further , when an ultraviolet absorber is mixed in the clear ink layer , the ultraviolet absorber absorbs ultraviolet rays, so that the amount of ultraviolet rays reaching the fluorescent pigment is remarkably reduced, and the decomposition of the fluorescent pigment is correspondingly reduced. It is possible to prevent the fading of the fluorescent color.

[0011]

EXAMPLE Next, a specific example of the configuration of the present invention will be described. The transfer sheet according to the present invention has, for example, the layer structure shown in FIG. That is, the transfer sheet is formed by laminating the base sheet 1, the white ink layer 2, the pseudo ink layer 3, the fluorescent ink layer 4, the clear ink layer 5 and the protective film layer 6 in this order. Of these,
After the transfer, the layers transferred to the adherend, that is, the white ink layer 2, the pseudo ink layer 3, the fluorescent ink layer 4, and the clear ink layer 5 form a transfer mark as the transfer ink layer T.

Here, as the base material sheet 1, a material which can be peeled off from the white ink layer 2 is used.
A release liner coated with a release agent such as silicone on one side,
Alternatively, a paper having a water-soluble glue layer, a plastic sheet of polyethylene or the like, which itself has releasability, and the like can be exemplified.

Further, the white ink layer 2, the pseudo ink layer 3,
Vehicles in the fluorescent ink layer 4 and the clear ink layer 5 include, for example, epoxy resins, alkyd resins, tackifiers, saturated polyester resins, urethane resins, acrylic resins, thermoplastic resins such as vinyl chloride resin, melamine resins, One of thermosetting resins such as blocked isocyanate or a mixture of two or more thereof can be used. Of these, it is preferable to use a melamine resin system because it is thermoset at a relatively low temperature, and in particular, a melamine resin system in which a melamine resin is blended with a polyester resin or an alkyd resin to give the melamine resin mainly malleability and the like. It is desirable to use a resin.

Among these vehicles, the molecular weight 1
Use of 20 to 200 parts by weight of at least one of a low molecular weight epoxy resin having a molecular weight of 500 to 4000 and a softening point of 50 to 100 ° C. and a tackifying resin with respect to 100 parts by weight of a high molecular weight epoxy resin of 0000 or more. Is desirable. When both the low molecular weight epoxy resin and the tackifying resin are used in combination, the low molecular weight epoxy resin is 20 to 100 parts by weight based on 100 parts by weight of the high molecular weight epoxy resin
The tackifying resin is preferably 20 to 100 parts by weight. When such a vehicle is used, it is possible to obtain a transfer mark which is less likely to change with time, has excellent weather resistance, and has excellent adhesion to an adherend having a curved surface. In addition, "molecular weight" here
Means all "number average molecular weights".

As the tackifying resin, terpene resin, terpene phenol resin, phenol resin, rosin resin, coumarone indene resin, aliphatic (C-5) petroleum resin, aromatic (C-9) petroleum resin, Examples include aliphatic / aromatic mixed (C-5 / C-9) petroleum resins, ketone resins and hydrogenated resins thereof. Among these, terpene phenol resin, phenol resin, rosin resin, coumarone indene resin, aromatic (C-9) petroleum resin, aliphatic-aromatic mixed (C-5 / C-9) petroleum resin, ketone resin and these Hydrogenated resins and the like are particularly suitable, and particularly highly polar phenol resins, coumarone indene resins, aromatic (C-9) petroleum resins, and aliphatic-aromatic mixtures (C-5 / C-).
9) Petroleum resin and ketone resin are most suitable.

On the other hand, as the pigment mixed in the transfer ink layer T, that is, the pseudo ink layer 3 or the fluorescent ink layer 4, inorganic and organic acids such as titanium oxide, carbon black, azo type, phthalocyanine type and dioxazine type are used. It can be illustrated. Further, the fluorescent ink layer 4 is mixed with a fluorescent pigment of these. Then, in the pseudo ink layer 3, a pigment having a color substantially the same as or a color similar to the color obtained by removing the fluorescent effect from the fluorescent pigment is mixed. The white ink layer 2 mixed white pigment, or the clear ink layer 5 incorporating a transparent or semi-transparent pigments, or may not be mixed with pigment.

Further, for the purpose of protecting the transfer ink layer T after the transfer, it is possible to coat it with a transparent or semitransparent overcoat layer (not shown) after the completion of the transfer. As a material for forming the overcoat layer, a coating material such as urethane resin, acrylic resin, epoxy resin, or fluororesin can be used.

When the overcoat layer is formed, fine silica is used as a material for forming the clear ink layer 5 in order to enhance the adhesion with the overcoat layer.
It is preferable to use a vehicle in which a transparent extender pigment such as barium sulfate is mixed. On the other hand, when the overcoat layer is not formed, it is preferable to use a vehicle containing a small amount of a known printing additive such as an antifoaming agent or a leveling agent in order to enhance the peelability from the protective film layer 6. it can.

Further, it is effective to add an ultraviolet absorber to the clear ink layer 5. As the ultraviolet absorber, benzophenone type, benzotriazole type, salicylate type, organic type such as phenyl acrylate and iron oxide are used. Inorganic UV absorbers are effective. further,
It is effective to add the stabilizer as well.

As the protective film layer 6, for example, a vinyl chloride resin or an acrylic resin mixed with an ester plasticizer such as glycol and phthalic acid ester or adipic acid ester or a polyester plasticizer can be used. .

Each ink layer and the protective film layer 6 in the transfer ink layer T can be formed by screen printing. That is, these layer forming materials can be obtained by sequentially screen-printing on the base material sheet 1. The protective film layer 6 preferably covers the entire surface including the end surface of the transfer ink layer T,
In the case of a single pattern or the like, the transfer ink layer T may have the same shape and only the outer surface thereof may be covered.

When it is desired to reduce the thickness of the transfer ink layer T, the pseudo ink layer is omitted and the fluorescent ink layer has substantially the same color as the fluorescent pigment and the color obtained by removing the fluorescent effect from the color of the fluorescent pigment. Alternatively, it is possible to mix pigments of similar colors and mix an ultraviolet absorber, a stabilizer, etc. in the fluorescent ink layer, but the degree of discoloration becomes large as compared with the present invention.

When using the thus obtained heat transfer sheet, first, the base material sheet 1 is peeled off, and the transfer ink layer T is pressure-bonded to the adherend with a squeegee or the like to make it fit. Then, at an appropriate temperature, for example 60 to 100 ° C.
Heat to a temperature of (80-120 ° C for thermosetting type),
Adhere to the adherend. When the cooling is completed, the protective film layer 6 is peeled off, leaving only the transfer ink layer T, and the transfer is completed.

<Examples> Examples will be shown below to further clarify the effects of the present invention.

(Example 1) In this example, a polymer epoxy resin (trade name; Epicoat C) was used as a vehicle.
L-52-BH35, manufactured by Yuka Shell Epoxy Co., Ltd./low molecular weight epoxy resin (trade name; Epicoat 1001, manufactured by Yuka Shell Epoxy Co., Ltd.) = 100 parts by weight / 100 parts by weight was prepared.

A white ink was screen-printed on the base material sheet to form a white ink layer, and a pseudo ink was printed on the same to form a pseudo ink layer. Fluorescent ink is printed on the same shape to form a fluorescent ink layer,
Furthermore, clear ink was printed on the same shape to form a clear ink layer. A protective film layer was printed thereon so as to completely cover the clear ink layer. The white ink, the pseudo ink, the fluorescent ink, and the clear ink were each formed of the following materials. White ink: Vehicle / titanium white = 100 parts by weight / 100 parts by weight were mixed and prepared. Pseudo Ink: Vehicle / Shimla First Yellow R
F (trade name, manufactured by Dainippon Ink and Chemicals) = 100 parts by weight / 15
It was prepared by mixing in a ratio of parts by weight. Fluorescent ink: Vehicle / FA-46 Orange Yellow (trade name, manufactured by Shin Roihi Co., Ltd.) / 100 parts by weight / 50 parts by weight. Clear ink: Vehicle / fine particle silica = 100 parts by weight / 10 parts by weight were mixed and prepared.

Further, the pseudo ink, the fluorescent ink, and the clear ink were each mixed with an ultraviolet absorbent 2,4-hydroxybenzophenone (trade name: Seathorpe # 100, manufactured by Cypro Kasei Co., Ltd.) in an amount of 5% each.

The transfer sheet prepared as described above was transferred onto an adherend, and then the color fading after weathering for 500 hours was visually evaluated.

(Example 2) As a vehicle, an alkyd resin (trade name; Beckcozol EZ-3020-60, manufactured by Dainippon Ink and Chemicals) / melamine resin (trade name; Super Beckamine L-110-60, Dai Nippon Ink Co., Ltd.) Made) = 10
0 parts by weight / 30 parts by weight, and 2-hydroxy-4-n-dodecylbenzophenone (trade name; Seathorp # 103, manufactured by Cypro Kasei Co., Ltd.) as an ultraviolet absorber, pseudo ink, fluorescent ink The same test as in Example 1 was carried out under the other conditions in which the following were replaced respectively.
The ink layer in this example is thermosetting.

Pseudo ink: Vehicle / Shimla First Yellow 4186 (trade name, manufactured by Dainippon Ink and Chemicals) = 1
It was prepared by mixing at a ratio of 00 parts by weight / 15 parts by weight.

Fluorescent ink: Vehicle / FA-45J (trade name, manufactured by Shin Roihi Co.) = 100 parts by weight / 60 parts by weight was mixed to prepare.

Comparative Example 1 A test was conducted under the same conditions as in Example 1 except that the ultraviolet absorber was not mixed and the pseudo ink layer was not provided.

Comparative Example 2 A test was conducted under the same conditions as in Example 2 except that the ultraviolet absorber was not mixed and the pseudo ink layer was not provided.

The test results of Examples 1 and 2 and Comparative Examples 1 and 2 are shown in Table 1 above.

[0035]

[Table 1]

As can be seen from Table 1, according to the present invention, even if the fluorescent color in the fluorescent ink layer is discolored, the beautiful feeling by visual evaluation is not impaired.

[0037]

As described above, according to the present invention, even if the fluorescent pigment in the transfer mark is discolored, the appearance of the adherend is not significantly impaired. Further, even when it is transferred to an adherend used outdoors, it is possible to suppress the fading of the fluorescent pigment.

[Brief description of drawings]

FIG. 1 is a schematic sectional view of a basic layer structure of a transfer sheet according to the present invention.

[Explanation of symbols]

1 ... Substrate sheet, 2 ... White ink layer, 3 ... Fluorescent color holding pseudo ink layer, 4 ... Fluorescent ink layer, 5 ... Clear ink layer, 6 ... Protective film layer, T ... Transfer ink layer.

Claims (1)

(57) [Claims] 1. A base sheet, transfer ink layer, and a protective film layer possess in this order, the peeling the said base sheet
After applying it to the body, heat-bond it and peel off the protective film layer.
Heat transfer sheet that peels and transfers the transfer ink layer to the adherend
In the transfer ink layer, the white ink layer, the fluorescent color-holding pseudo ink layer, the fluorescent ink layer, and the clear ink layer are formed in this order from the base material sheet side in the same shape. In the fluorescent ink layer, a fluorescent pigment is mixed, and in the fluorescent color retaining pseudo ink layer, a pigment that is substantially the same color or a similar color as the color obtained by removing the fluorescent effect from the color of the fluorescent pigment is used. It is mixed, in the clear ink layer, an ultraviolet absorber is mixed
Thermal transfer sheet, characterized in that there.