Method for producing a pigment dispersion for water-based ink, method for producing water-based ink, and method for producing printed matter
JP2026110928AActive Publication Date: 2026-07-03TOYO INK MFG CO LTD
Patent Information
- Application Number
- JP2024225969
- Authority / Receiving Office
- JP · JP
- Patent Type
- Applications
- Current Assignee / Owner
- Filing Date
- 2024-12-23
- Publication Date
- 2026-07-03
- Estimated Expiration
- 2044-12-23
AI Technical Summary
Technical Problem
Conventional pigment dispersions for isoindoline pigments in printing inks exhibit high viscosity and cause ink discoloration over time, leading to deterioration in printed matter quality.
Method used
A method involving the dispersion of isoindoline pigments with amines having a molecular weight of 1000 or less, specifically primary and secondary amines, to form salts with carboxyl groups, reducing viscosity and preventing ink discoloration.
Benefits of technology
The method produces a pigment dispersion with low viscosity and suppresses ink discoloration, resulting in improved stability and quality of printed materials.
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Smart Images
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Abstract
The present invention aims to provide a method for producing a pigment dispersion for aqueous inks that has low viscosity and suppresses discoloration of the ink over time. [Solution] A method for producing a pigment dispersion for water-based ink, The method involves dispersing a mixture of isoindoline pigment, water, and amine (A) with a molecular weight of 1000 or less (excluding amides and melamines). A method for producing a pigment dispersion for aqueous ink, wherein the amine (A) is one or more selected from the group consisting of primary amines and secondary amines.
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Citation Information
Patent Citations
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