Active light-curable inkjet ink and image forming method

Abstract

The present invention provides an active light-curable inkjet ink capable of stably forming high-definition images even under high-speed recording and having good adaptability to various recording materials, or an image forming method using the same. The active light-curable inkjet ink contains a gelling agent, a photopolymerizable compound, and a photoinitiator, and undergoes a sol-gel phase transition reversibly by temperature, wherein (1) the mass relative to the ink as a whole is 30 to 70 mass % contains a (meth)acrylate compound with a molecular weight in the range of 300 to 1500 and 3 to 14 structural units represented by -CH2-CH2-O- in the molecule as the first photopolymerizable compound (2) containing a (meth)acrylate compound with a molecular weight in the range of 300 to 1500 and a ClogP value in the range of 4.0 to 7.0 in the range of 10 to 40% by mass relative to the overall mass of the ink as the second light A polymeric compound; and (3) the total carbon number of the gelling agent is 12 or more, and contains a linear or branched alkyl chain with 3 or more carbon atoms.

Description

technical field [0001] The present invention relates to an active ray curable inkjet ink containing a gelling agent and an active ray curable composition and an image forming method using the same. Background technique [0002] Conventionally, active ray-curable compositions cured by active energy rays such as ultraviolet rays or electron beams have been used in coatings, adhesives, printing inks, printed circuit boards, and electrical insulation-related products such as plastics, paper, wood products, and inorganic materials. Practical for various purposes. [0003] In addition, inkjet ink systems using these polymerizable compositions include ultraviolet curable inkjet inks that are cured by ultraviolet light (hereinafter simply referred to as "UV"). The inkjet method using this ultraviolet curable ink has been attracting attention in recent years because it has quick-drying properties and can record on non-ink-absorbing recording materials. [0004] However, in the imag...

AI Technical Summary

Problems solved by technology

However, in the ink having a gelling agent and a photopolymerizable compound, in the case of using a relatively low molecular weight radical polymerizable compound with a molecular weight of less than 300, there is also a problem that the ink composition cannot Insufficient stability, odor of the ink itself, strong odor of printed matter after curing, etc. Environmental hygiene problems

Therefore, it is difficult to make the gelling agent exist stably in the highly hydrophilic ink, so there is no known ultraviolet curable inkjet ink composition that satisfies all the conditions of high image quality, curability, and curing shrinkage.

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