JP2880845B2 - UV curable ink - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a ultraviolet ray hardening type ink used in the screen printing or other common printing.

[0002]

2. Description of the Related Art Ultraviolet light conventionally used for screen printing
In line hardening type screen ink, 1) for decreasing the viscosity as a diluent, 2) to ensure the adhesion to the printing material, 3) for providing flexibility to the cured coating film, N and the like for the purpose -Vinyl-2-pyrrolidone (N-V-
2-P) is used in combination with various photoreactive oligomers or in combination with various photoreactive oligomers and various photoreactive diluents.

[0003]

However, N-vinyl-2-pyrrolidone has a large odor as a physical property, and is not preferable in terms of safety and health for the human body. Therefore, using this N- vinyl-2-pyrrolidone to ultraviolet ray hardening type screen ink by the combination, not only causing a discomfort to the ink handlers by odor, accompanied concerns also in safety and health there were.

[0004] The present invention has been made in view of such conventional circumstances, and does not use N-vinyl-2-pyrrolidone, but has the required viscosity, adhesiveness to a printing medium, and cured coating film. it is an object to provide a ultraviolet ray hardening type ink such as addition of flexibility.

[0005]

According to the present invention, there is provided a polyester acrylate,
Ether acrylate, epoxy acrylate, alk
N-acrylate by containing vinylcaprolactam (VCL) as a diluent
An ultraviolet curable screen ink or a general ink having the same performance and physical properties as conventional inks containing vinyl-2-pyrrolidone has been obtained. Here, vinyl caprolactam is represented by the following chemical structure.

[0006]

Embedded image Tables below show examples of the composition of the present invention.

[Table 1]

Here, the desirable compounding amount range of VCL is 5
To 50 parts by weight, and a particularly desirable compounding amount range is 5 to 3 parts by weight.
0 parts by weight. The reason why the usage range of the VCL in the ultraviolet-curable screen ink is 1 to 95 parts by weight is that it is necessary to mix a photoinitiator. further,
The specific formulations of Table 1 are as follows. -As photoreactive oligomers, polyurethane acrylate, polyester acrylate, polyether acrylate, epoxy acrylate, oligo acrylate,
Alkyd acrylate, polyol acrylate, and the like are used. -As a photoreactive diluent, long-chain aliphatic acrylate,
Allyl acrylate, benzyl acrylate, butoxyethyl acrylate, butanediol monoacrylate, t-butylaminoacrylate, caprolactam acrylate, hydroxypropyl acrylate, cyanoethyl acrylate, cyclohexyl acrylate, cyclopentanyl acrylate, N, N-diethylaminoethyl acrylate, 2-ethoxy Ethyl acrylate, glycerol acrylate, glycidyl acrylate, isobornyl acrylate, isodecyl acrylate, isooctyl acrylate, lauryl acrylate, morpholine acrylate, phenoxy acrylate, EO-modified phosphate acrylate, EO-modified phthalic acrylate, polyethylene glycol acrylate, Polypropylene glycol Acrylate, stearyl acrylate, vinyl acetate, acrylated isocyanates, bisphenol A di acrylate, EO-modified bisphenol A di acrylate, EO-modified bisphenol F
Diacrylate, 1,4-butanediol diacrylate, 1,3-butylene glycol diacrylate, cyclopentanyl diacrylate, diethylene glycol diacrylate, EO-modified diethylene glycol diacrylate, dipentaerythritol hexaacrylate,
Alkyl-modified dipentaerythritol tetraacrylate, alkyl-modified dipentaerythritol triacrylate, caprolatum-modified dipentaerythritol hexaacrylate, ditrimethylolpropane tetraacrylate, ECH-modified ethylene glycol diacrylate, glycerol acrylate, ECH-modified glycerol triacrylate, 1,6- Hexanediol diacrylate, long-chain aliphatic diacrylate, ethoxylated cyclohexyl diacrylate, neopentyl glycol diacrylate, pentaerythritol triacrylate, pentaerythritol tetraacrylate, EO-modified phosphate diacrylate, EO-modified phosphate triacrylate, ECH-modified Phthalic acid diacrylate, polyethylene glycol diacrylate , Polypropylene glycol diacrylate, tetraethylene glycol diacrylate, triethylene glycol diacrylate, triethylene glycol divinyl ether, triglycerol diacrylate, neopentyl glycol-modified trimethylolpropane triacrylate, trimethylolpropane triacrylate, EO-modified triacrylate Methylolpropane triacrylate, PO-modified trimethylolpropane triacrylate, ECH-modified trimethylolpropane triacrylate, tripropylene glycol diacrylate, tris (acryloxyethyl) isocyanate, caprolactam-modified tris (acryloxyethyl)
Isocyanates and those in which these acrylate moieties have become methacrylate are used.

[0008] As the photoinitiator, benzoin type, benzophenone type, acetopheno type, thioxanthone type, special type, etc. are used. -As the photosensitizer, an aliphatic amine type, an aromatic amine type, or the like is used.・ Additives include silicone resin, silicone oil, hydroxyl-added silicone, and polyhydric acid as fluidity regulators such as defoaming property, leveling property on the printed material, mesh hole passing property, and transfer ink release property. A siloxane compound, a surfactant based on an acrylic oligomer, a fluorine-based surfactant, or the like is used.

Further, stabilizers, ultraviolet absorbers, matting agents, antiblocking agents and the like are used according to the purpose and application. As coloring and extender pigments, organic and inorganic color pigments, extender pigments for imparting printability and adjusting fluidity, and the like are used according to the purpose and application.

[0010]

EXAMPLES Table 2 below shows the formulations of Examples 1 to 3 of the present invention and Comparative Examples 1 to 3 corresponding to Examples 1 to 3, and Table 3 shows the evaluation of the characteristics.

[0011]

[Table 2]

[Table 3]

Examples 1 to 3 and Comparative Examples 1 to 3
Der those cured by energy of 200 millijoules / cm2 ultraviolet is, film thickness was 15 microns.

In Example 1, the corresponding comparative example 1 is NV-
While NV was blended at 30.0% by weight, NV-2
VCL was changed to 30.0 instead of -P.
% By weight. In the evaluation of the characteristics of Example 1 and Comparative Example 1, Comparative Example 1 showed that the other items except for the odor were “good” and the odor was “bad”, whereas Example 1 showed the odor. All items including "good"
Therefore, it was found that the odor can be improved while maintaining the evaluation of other items at “good”.

In Example 2, the corresponding Comparative Example 2 is NV-
2-P was added at 20.0% by weight, whereas NV-2
VCL instead of 20.0 without blending -P
% By weight. In the evaluation of the characteristics of Example 2 and Comparative Example 2, Comparative Example 2 has an odor of “poor”, a bending property of PVC of “medium”, and other items of “good”. In Example 2, the odor was “good”, and it was found that the odor could be improved without lowering the evaluation of other items.

In Example 3, the corresponding comparative example 3 is TPGD
A was added at 30.0% by weight, while TPGDA was added at 2%.
VCL was added at 10.0% by weight to 0.0% by weight. In the evaluation of the characteristics of Example 3 and Comparative Example 3, Comparative Example 3 showed that the adhesiveness to PC was “poor” and P
While the adhesiveness to VC and the bendability with PVC are “intermediate” and the odor and curability are “good”, in Example 3, all items are “good”, and the odor and curability It has been found that the adhesiveness to PC, the adhesiveness to PVC, and the bendability with PVC can be improved without lowering the evaluation of.

[0016]

As described above, according to the present invention, poly
Ester acrylate, polyether acrylate, d
Both oxyacrylate and alkyd acrylate
Or blended vinylcaprolactam as a diluent comprises,
Compared with conventional photo-reactive diluents, UV-curable inks with a fluidity modifier added to them without the discomfort caused by odors and the health and safety concerns of the human body. An ultraviolet curable ink having the properties and physical properties described above was obtained. Therefore, it was possible to provide an ultraviolet curable ink which maintains the performance and physical properties, does not give an unpleasant odor to an ink handler, and is also preferable in terms of safety and health for the human body.

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Claims (4)

(57) [Claims] 1. Polyester acrylate, polyether
Ruacrylate, epoxy acrylate, alkyd
Ultraviolet ray hardening type ink, wherein the formulated as a diluent vinylcaprolactam comprise any of the acrylate. Wherein said vinyl caprolactam, claim 1 Symbol, characterized in that in combination blended with other photoreactive diluents
Ultraviolet ray hardening type ink placement. 3. The method according to claim 1, wherein a fluidity modifier is further added.
The ultraviolet curable ink according to claim 1, wherein Wherein said vinyl caprolactam with combination blended with other photoreactive diluents, ultraviolet ray hardening type ink according to claim 1, wherein the addition of fluidity modifier.