CN-117043288-B - Active energy ray-curable ink composition for inkjet

Abstract

The purpose of the present invention is to obtain an active energy ray-curable inkjet ink composition which is characterized in that the color development is improved, and in that the ink composition can be cured by means of an LED, and in that the cured coating film has high hardness and excellent abrasion resistance and water resistance. An ink composition for an active energy ray-curable inkjet, characterized by comprising a pigment, a pigment dispersant and a photopolymerizable compound, wherein the pigment comprises pigment violet 19 and pigment orange 71, the pigment violet 19 is 30.0 to 85.0 mass% relative to the total mass of pigment violet 19 and pigment orange 71, the photopolymerizable compound satisfies all the following (A) to (F) conditions, (A) comprises 0.20 to 15.0 mass% of a polyfunctional amine-modified oligomer in the total amount of the total polymerizable components, (B) comprises 50.0 mass% or more of a monofunctional monomer in the total amount of the total polymerizable components, (C) comprises 35.0 mass% or more of a monofunctional monomer having a glass transition temperature of 20 ℃ or more in the total amount of the total polymerizable components, (D) comprises 35.0 mass% or more of a monofunctional monomer having a glass transition temperature of 10 ℃ or less in the total amount of the total polymerizable components, and (E) comprises 0.0 to 10 mass% of a monofunctional monomer having a glass transition temperature of 10 ℃ or less in the total amount of the total polymerizable components, and (F) comprises 50.0 mass% or more of a monofunctional monomer having a glass transition temperature of 10 ℃ in the total amount of the total polymerizable components.

Inventors

• Nakajima Kyonori
• Ming Laituozai
• KAWABATA HIROSHI
• KAZUO HARA

Assignees

• 阪田油墨股份有限公司

Dates

Publication Date

20260505

Application Date

20211214

Priority Date

20210325

Claims (4)

1. 1. An active energy ray-curable inkjet ink composition characterized by, Comprises a pigment, a pigment dispersant and a photopolymerizable compound, The pigment contains pigment violet 19 and pigment orange 71, the pigment violet 19 is 30.0-85.0% by mass relative to the total mass of the pigment violet 19 and pigment orange 71, The photopolymerizable compound satisfies all of the following main conditions (A) to (F): (A) Contains 0.20 to 15.0 mass% of a polyfunctional amine-modified oligomer based on the total amount of the polymerizable components, (B) Contains a monofunctional monomer in an amount of 50.0 mass% or more based on the total amount of the polymerizable components, (C) Contains a monofunctional monomer having a glass transition temperature of 20 ℃ or higher in an amount of 35.0 to 60.0 mass% based on the total amount of the polymerizable components, (D) Contains a monofunctional monomer having a glass transition temperature of 10 ℃ or less in an amount of 35.0 to 60.0 mass% based on the total amount of the polymerizable components, (E) Contains 2.0 to 11.0 mass% of a polyfunctional monomer having a glass transition temperature of 10 ℃ or less based on the total amount of the polymerizable components, (F) The composition contains 10.0 to 25.0 mass% of nitrogen-containing monofunctional monomers based on the total amount of the polymerizable components.
2. 2. The active energy ray-curable inkjet ink composition according to claim 1, wherein (a) the multifunctional amine-modified oligomer is a 2-functional amine-modified oligomer, and the viscosity at 25 ℃ is 2000cps or less.
3. 3. The active energy ray-curable inkjet ink composition according to claim 1 or 2, wherein the nitrogen-containing monofunctional monomer is at least 1 selected from the group consisting of vinylcaprolactam, N-dimethylacrylamide, vinylmethyl oxazolidinone, and acryloylmorpholine.
4. 4. The active energy ray-curable inkjet ink composition according to any one of claims 1 to 3, wherein the OD value of an ink coating film formed in a solid portion by color development with a #4 coating rod or by inkjet printing is 1.30 or more, b The value is 28.0-32.0.

Description

Active energy ray-curable ink composition for inkjet Technical Field The present invention relates to an active energy ray-curable inkjet ink composition and a printing method. Background Patent document 1 describes an inkjet ink containing pigment violet 19. Patent document 2 describes an ink composition containing any one of pigment orange 43, pigment green 36, and pigment violet 23. Patent document 3 describes an ink jet ink composition containing at least 1 kind of organic pigment exhibiting orange, violet or green color. As described in these patent documents, ink compositions containing pigment orange or pigment violet are known. Further, as described in patent document 4, an active energy ray-curable ink composition for inkjet printing is known which contains a monofunctional or polyfunctional photopolymerizable compound and an oligomer. According to the active energy ray-curable ink composition for inkjet printing, excellent effects are exhibited in various aspects such as storage stability, effect, tackiness, etc., but it is not confirmed whether it can be used for various substrates, nor is it examined whether it can be used for other substrates such as polycarbonate or polyvinyl chloride, or whether the hardness, abrasion resistance and water resistance of a cured coating film are improved. That is, the active energy ray-curable ink composition for inkjet is not intended to be used for a substrate of a larger number of materials, but is intended to have a higher hardness and to be used in a wider range of fields such as abrasion resistance and water resistance. Therefore, there is a possibility that the ink composition cannot be sufficiently applied depending on the application of the substrate for forming a coating film using the active energy ray-curable inkjet ink composition or the use environment. Patent literature Patent document 1 Japanese patent application laid-open No. 2018-95739 Patent document 2 Japanese patent application laid-open No. 2020-84102 Patent document 3 Japanese patent laid-open No. 2009-67955 Patent document 4 Japanese patent application laid-open No. 2019-31618 Disclosure of Invention As described in the above patent documents, ink compositions each containing pigment orange or pigment violet alone are known. However, in such an ink composition, as a magenta ink composition, it is not possible to achieve both of a more appropriate optical density and bValues. The present invention provides an active energy ray-curable inkjet ink composition, which is characterized in that the ink composition can be cured by an LED while improving the color development, and the cured coating film has high hardness and excellent abrasion resistance and water resistance. The present inventors have conducted intensive studies to solve the above problems, and as a result, have found that the above problems can be solved by preparing an active energy ray-curable inkjet ink composition having a specific pigment composition, and have completed the present invention. The active energy ray-curable ink composition for inkjet according to the present invention has excellent color rendering properties as red, and thus can achieve an appropriate optical density and b)The adhesive properties to various substrates are excellent, and the curing can be sufficiently obtained by active energy rays using an LED as a light source, the resulting coating film has high hardness and exhibits excellent abrasion resistance and water resistance. Detailed Description The active energy ray-curable inkjet ink composition of the present invention will be described below. First, the glass transition temperature in the present invention is defined as follows. < Glass transition temperature > The glass transition temperature of the resin in the present invention is a theoretical glass transition temperature obtained by the following Wood formula when the resin is an acrylic copolymer resin. Wood formula: 1/tg=w1 Tg1+W2/Tg2+W3/Tg3++Wx/Tgx [ Wherein Tg1 to Tgx represent monomers 1, 2 and 3 constituting the resinThe glass transition temperature of each homopolymer of x, W1 to Wx represent monomers 1,2 and 3X, tg represents the theoretical glass transition temperature. Wherein, the glass transition temperature in the Wood formula is absolute temperature. ] < Pigment > The active energy ray-curable ink composition for inkjet according to the present invention contains pigment violet 19 and pigment orange 71. Further, pigment violet 19 is 30.0 to 85.0 mass% relative to the total mass of pigment violet 19 and pigment orange 71. Among them, pigment violet 19 is preferably 40.0 mass% or more, more preferably 45.0 mass% or more, still more preferably 50.0 mass% or more, and most preferably 55.0 mass% or more. Further, pigment violet 19 is preferably 83.0 mass% or less, more preferably 75.0 mass% or less, further preferably 70.0 mass% or less, and most preferably 65.0 mass% or less. When the content ratio of pigment violet 19 and pig