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Ink composition

a technology of composition and pigment, applied in the field of pigment composition, can solve the problems of short life of light source, irradiated ultraviolet ray, difficult use of methods, etc., and achieve the effect of high transmission, sufficient curing, and sufficient curing

Inactive Publication Date: 2006-07-20
SEIKO EPSON CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0013] Accordingly, an object of the invention is to provide an ink composition which is suitable for ultraviolet irradiation / curing using an ultraviolet LED having a light-emission peak of a very narrow width in the wavelength direction, and is free from a curing defect due to the influence of scattering and absorption of the ultraviolet ray by a coloring material.
[0024] The ink composition of the invention uses, as photo-polymerization initiators, two or more compounds which absorb a light having a wavelength of 365 nm or longer and generate radicals to initiate polymerization of the polymerizable compound. Therefore, even when the ink compound contains a coloring material such as a pigment, an ultraviolet LED having a light emission peak of a very narrow width in the wavelength direction is used, and a scattering / reflection / absorption peak of the coloring material partially overlaps with a peak of an ultraviolet ray to be irradiated, a photo-polymerization initiator having an absorption peak different from the scattering / reflection / absorption peak of the coloring material may act and hence a curing defect can be avoided.
[0030] Further, the ink composition of the invention prevents a surface curing defect and an inside curing defect by the use of polymerizable fine particles as a polymerization accelerator, whereby good printing results can be obtained.

Problems solved by technology

Coloring materials such as pigments have strong scattering / absorption also in an ultraviolet region in many cases and hence the irradiated ultraviolet ray is not effectively utilized, so that ultraviolet-curable inks containing coloring materials are apt to cause a curing defect.
However, these methods are not preferred because of high facility costs and also there are problems that irradiation by a mercury lamp requires a cooling device and the life of the light source is short, so that the methods are not easy to use.
Further, in these methods, since heat is applied to the recording media, there is also a problem that usable recording media are limited.
Therefore, it is still very difficult to cure the ink in the case where a reflection / absorption peak of a coloring material such as a pigment to be used overlaps with an ultraviolet peak to be irradiated.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

example 1a

1. Preparation of Polymerizable Fine Particles 1A and Dispersion Thereof

[0108] To a 200 mL Erlenmeyer flask was added 88.1 parts by weight of a silica sol IPA-ST [an isopropyl alcohol (hereinafter abbreviated as “IPA”) dispersion having a silica concentration of 30 wt %, manufactured by Nissan Chemical Industries, Ltd.] and then 7.9 parts by weight of a silane coupling agent Sila-Ace S710 (3-methacryloxypropyltrimethoxysilane, manufactured by Chisso Corp.) was added thereto. Under stirring with a magnetic stirrer, 4 parts by weight of hydrochloric acid having a concentration of 0.05 mol / L was added thereto and the reaction was carried out under stirring at room temperature for 24 hours. As a result, IPA Dispersion A containing Polymerizable Fine Particles 1A having a methacryl group (MPS) was obtained.

[0109] To a 300 mL round-bottom flask were added 70 parts by weight of N-vinylformamide (hereinafter also referred to as “NVF”, Beam Set 770, manufactured by Arakawa Chemical Indust...

example 2a

1. Preparation of Polymerizable Fine Particles 2A and Dispersion Thereof

[0119] To a 200 mL Erlenmeyer flask was added 88.5 parts by weight of a silica sol IPA-ST (an IPA dispersion having a silica concentration of 30 wt %, manufactured by Nissan Chemical Industries, Ltd.) and then 7.5 parts by weight of a silane coupling agent KBM-5103 (3-acryloxypropyltrimethoxysilane, manufactured by Shin-Etsu Chemical Co., Ltd.) was added thereto. Under stirring with a magnetic stirrer, 4 parts by weight of hydrochloric acid having a concentration of 0.05 mol / L was added thereto and the reaction was carried out under stirring at room temperature for 24 hours. As a result, IPA Dispersion G containing Polymerizable Fine Particles 2A having an acryl group (APS) was obtained.

[0120] To a 300 mL round-bottom flask were added 70 parts by weight of NVF and 100 parts by weight of the above Dispersion G, and then IPA was removed by evaporation using a rotary evaporator to obtain Dispersion H containing ...

example 3a

1. Preparation of Titanium Dioxide Fine Particles (White Pigment) and Dispersion Thereof

[0126] A titanium-containing ore was dissolved in sulfuric acid to obtain a titanium sulfate solution. To a hydrous titanium oxide obtained by hydrolyzing the titanium sulfate solution were added 0.50 part by weight of ammonium phosphate, 0.30 part by weight of potassium sulfate, and 0.30 part by weight of aluminum sulfate relative to 100 parts by weight, and the hydrous titanium oxide was heated in a laboratory rotary muffle furnace until the product temperature reached 1,020° C. When the resulting titanium dioxide fine particles were cooled to room temperature and observed on a transmission electron microscopic photograph, it was found that the particle was anatase type one having an average primary particle size of 0.13 μm. Then, 1500 g of the surface-treated titanium dioxide fine particles and 1000 g of isopropyl alcohol (hereinafter referred to as IPA) were mixed with each other and zircon...

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Abstract

The present invention provides an ink composition comprising at least a polymerizable compound, a photo-polymerization initiator and a polymerization accelerator, wherein the polymerizable compound comprises an N-vinyl compound, the photo-polymerization initiator comprises two or more compounds selected from the group consisting of bisacylphosphine oxides, monoacylphosphine oxides and α-amino ketones, and the polymerization accelerator comprises fine particles having a polymerizable functional group. The ink composition of the invention may be a transparent ink composition containing no coloring material. The ink composition of the invention may further contain a fluorescent whitening agent.

Description

FIELD OF THE INVENTION [0001] The present invention relates to an ink composition. More specifically, it relates to an ink composition which cures with an ultraviolet ray and which is free from a curing defect due to the influence of scattering and absorption of the ultraviolet ray by a coloring material component. Particularly, the invention relates to an ink composition suitable for irradiation and curing with an ultraviolet ray using an ultraviolet LED having a light-emission peak of a very narrow width in the wavelength direction. BACKGROUND OF THE INVENTION [0002] An inkjet recording method is a printing method wherein printing is performed by ejecting small droplets of an ink composition and attaching them to a recording medium such as paper. The inkjet recording method has characteristics that images having a high resolution and a high quality can be printed in a high speed. The ink composition for use in the inkjet recording method generally contains an aqueous solvent as a ...

Claims

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Application Information

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IPC IPC(8): C08F2/46
CPCC09D11/101
Inventor OYANAGI, TAKASHINAKANO, KEITARO
Owner SEIKO EPSON CORP
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