Inkjet ink composition and recording method

By using phenyl (2,4,6-trimethylbenzoyl)phosphinate as a photopolymerization initiator in the inkjet ink composition and controlling the content of aromatic groups and water, the problems of storage stability and curability under low and high temperature conditions are solved, and the high stability and low odor effect of the ink composition are achieved.

CN120504997APending Publication Date: 2025-08-19SEIKO EPSON CORP
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Patent Information

Application Number
CN202510160959.X
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Priority Date
2024-02-16
Filing Date
2025-02-13
Publication Date
2025-08-19

AI Technical Summary

Technical Problem

When the existing inkjet ink composition is stored under low and high temperature conditions, the polymerization initiator precipitation or moisture causes foreign matter to occur, resulting in insufficient storage stability and curability, and serious odor problems in the coating film.

Method used

Ethyl phenyl (2,4,6-trimethylbenzoyl)phosphinate was used as the photopolymerization initiator, and the content of polymerizable compounds and water containing aromatic groups was controlled, and the composition of the ink composition was optimized to improve storage stability and curability.

Benefits of technology

The polymerization initiator precipitation and moisture-induced foreign matter generation is suppressed under low and high temperature conditions, which improves the storage stability and curability of the ink composition and reduces the odor of the coated film.

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Abstract

The invention relates to an inkjet ink composition and a recording method. The inkjet ink composition has excellent storage stability and curability under low-temperature and high-temperature conditions, and is suppressed in odor. The inkjet ink composition contains phenyl (2, 4, 6-trimethylbenzoyl) phosphinic acid ethyl ester and a hydroxyl group-containing monomer, and does not contain an aromatic group-containing polymerizable compound, or in a case where the composition contains an aromatic group-containing polymerizable compound, does not contain an aromatic group-containing polymerizable compound. The content of the aromatic group-containing polymerizable compound is 5.0 mass% or less with respect to the total amount of the inkjet ink composition, and water is not contained, or when water is contained, the content of water is less than 2 mass% with respect to the total amount of the inkjet ink composition.
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