JPH0730275B2 - Transfer ink - 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 ink for applying to a support film when preparing a transfer sheet having a desired pattern printing surface.

[0002]

2. Description of the Related Art Recently, a transfer sheet on which an ink layer having a desired pattern is formed is placed on an object to be printed such as a wrapping paper or a packaging box,
A transfer printing method in which a printing surface is transferred by pressure bonding is often used. The transfer sheet used for printing is coated with a printing ink on the surface of a polymer film coated with a release agent in advance, then draws an adhesive and a photosensitizer, and then superimposes a negative film of a desired pattern on top of the photosensitive film. Let
It is created in the process of removing the unexposed portion with a developing solution.

At this time, as a printing ink applied to the transfer sheet, a solvent type ink in which a pigment and a vehicle composed of a resin and a volatile organic solvent are blended is conventionally used selectively. The reason for this is that the organic solvent that constitutes the vehicle improves the wettability with the release agent applied to the surface of the support film and forms a stable coating film without cissing or pinholes. However, since a harmful substance such as toluene and methyl ethyl ketone (MEK) is used as the organic solvent, there is a problem that it adversely affects the working environment and the human body.

[0004]

Under the circumstances, the inventors of the present invention have made earnest studies on a water-based transfer ink which is not harmful, and as a result, an appropriate amount of acrylic resin, alcohols and fluorine-based pigment has been added to the pigment. It was confirmed that an aqueous transfer ink capable of forming a good coating film was obtained by adding a surfactant.

The present invention was developed on the basis of the above findings, and its purpose is to form a uniform coating film without cissing and pinholes on the release surface of a support sheet, and to provide beautiful and stable printing after transfer. An object is to provide an aqueous transfer ink that can be transferred to a state.

[0006]

The transfer ink according to the present invention for achieving the above object comprises a pigment component of 10 to 50 parts by weight, an acrylic resin of 20 to 40 parts by weight, and an alcohol of 10 to 15 parts by weight.
Parts by weight, 20 to 35 parts by weight of water, and fluorosurfactant 3 to
The composition is characterized by a composition of 8 parts by weight.

The pigment component applied to the present invention is not particularly limited, and an inorganic or organic colorant which is commonly used in printing ink can be used.

The acrylic resin blended as a raw material component is a component that contributes to the formation of a continuous coating film. For example, a copolymer of methyl acrylate and ethyl acrylate, butyl acrylate, styrene, acrylonitrile, etc. is used. .
The acrylic resin effectively functions also for imparting weather resistance, abrasion resistance, color retention, etc. to the transfer coating film, but particularly when a resin having a relatively high glass transition point (Tg) is selected and used, the transfer There is an advantage that the stickiness of the coating film is reduced.

Alcohols are components that reduce the cissing phenomenon, which is a drawback of water-based inks. They dissolve in water,
Ethanol, which is non-toxic, is preferably used.

Fluorine-based surfactants improve the wetting properties of the ink to improve the wettability and the defoaming property, prevent the occurrence of cissing and pinholes, and facilitate the peeling from the support film. in functional components, fluoroalkyl group especially in the molecule for the purposes of the present invention (CF ₃ -CF ₂ -CF ₂ -
Those containing ..) are preferably used. The fluorine-based surfactant can reduce the surface tension of water to 15 dynes / cm at a low concentration, and exhibits excellent wettability and leveling property. Examples of this type of fluorine-based surfactant include anionic perfluoroalkylcarboxylic acid salts, perfluoroalkyl phosphates, and nonionic perfluoroalkylamine oxides.

In the transfer ink according to the present invention, each of the above raw materials is prepared by using 10 to 50 parts by weight of a pigment component, 20 to 40 parts by weight of an acrylic resin, 10 to 15 parts by weight of alcohols, 20 to 35 parts by weight of water, and a fluorine type. It is important that the composition is kneaded in a mixing ratio of 3 to 8 parts by weight of the surfactant, and if it is out of the mixing range, a good transfer sheet and printing cannot be formed. Among these, the amount of the acrylic resin compounded varies depending on the difference in the color material as the pigment component, and for example, when hydrophobic carbon black is used as the pigment component, it is necessary to add a large amount. However, if the content is below the lower limit of the above range, it becomes difficult to form a continuous coating film, and if the content exceeds the upper limit, it will not contribute to the effect. Particularly important is the amount of the fluorine-containing surfactant added. If the amount is less than 3 parts by weight, the surface-active effect will be insufficient to prevent the formation of cissing and pinholes, and the addition amount will exceed 8 parts by weight. Increases the peelability, and the coating film of the transfer sheet is easily peeled off.

[0012]

According to the transfer sheet of the present invention having the above composition, the action of forming a continuous coating film by an acrylic emulsion, the action of promoting the wettability of alcohol water, and the improvement of the wettability and the defoaming property by a fluorine-based surfactant are provided. The effects are synergistic, and although it is a water-based printing ink, a normal coating film without cissing or pinholes is always formed on the release surface of the support film,
At the same time, it is possible to transfer a beautiful print pattern onto the printing surface.

In addition, the transfer printing surface has appropriate flexibility, so that cracking or peeling does not occur at the time of bending, and since there is no chemical attack on the support film, the film can be reused. The effect such as is brought.

[0014]

EXAMPLES The present invention will be described below based on examples.

Example 1 50 parts by weight of titanium white as a pigment component, acrylic resin
20 parts by weight, 10 parts by weight of ethanol, 20 parts by weight of water, and 6 parts by weight of anionic perfluoroalkyl phosphate as a fluorine-containing surfactant were mixed and sufficiently kneaded to prepare an aqueous ink.

When an aqueous ink having the above composition was applied to the surface of a support film made of hard polypropylene treated with a release agent for silicone resin, the entire surface could be coated smoothly with extremely good flowability, and the coating film after drying was obtained. No cissing parts or pinholes were found on.

Then, an adhesive and a photosensitizer were applied to the upper surface of the ink coating film, a negative film having a design pattern was superposed thereon and exposed to light, and then a non-exposed portion was removed with a developing solution to prepare a transfer sheet. This transfer sheet was laid on the transfer paper and transferred. The print transferred in this manner was in a very beautiful and stable state with no transfer unevenness, and no crack was generated even when bent.

Example 2 10 parts by weight of carbon black as a pigment component, 40 parts by weight of an acrylic resin, 15 parts by weight of ethanol, 30 parts by weight of water, and a nonionic perfluoroalkylamine oxide 3 as a fluorosurfactant. Parts by weight were mixed and sufficiently kneaded to prepare a water-based ink.

When a water-based ink having the above composition was applied to the surface of a support film made of hard polyvinyl chloride treated with a wax release agent, a uniform coating film without cissing or pinholes could be formed on the entire surface.

Then, the ink coating surface was treated in the same manner as in Example 1 to form a transfer sheet, and the transfer sheet was pressure-bonded and transferred. As a result, it was transferred to a beautiful and stable printing state without transfer unevenness and was bent However, no cracks were found.

[0021]

As described above, according to the present invention, it is possible to form a coating film without cissing or pinholes on the surface of a support film even though it is an aqueous system, and it is beautiful on a printed material by a simple press transfer. A transfer ink capable of transferring stable printing can be provided. Therefore, since it does not cause environmental pollution or poisoning phenomenon to human body like conventional solvent ink during production and handling, it is expected to be used as an ink material with excellent safety and transferability for printing in various fields. To be done.

Claims (2)

[Claims] 1. A pigment component of 10 to 50 parts by weight, an acrylic resin.
A transfer ink having a composition comprising 20 to 40 parts by weight, alcohols 10 to 15 parts by weight, water 20 to 35 parts by weight, and a fluorosurfactant 3 to 8 parts by weight. 2. The transfer ink according to claim 1, wherein a fluorosurfactant having a fluoroalkyl group in the molecule is used.