Inkjet Ink Composition for High-Speed Printing and Odor Control
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Solution Overview
Problem
Inkjet printing technologies face challenges in increasing printing speed without compromising the quality or reliability of printed materials, particularly in terms of alcohol resistance, stretchability, and odor control, as existing solvents can cause nozzle clogging and poor solubility issues with binder resins.
Innovation Solution
An ink composition for inkjet recording is developed, comprising a color material, a binder resin with a specific ratio of acrylic-based resin and copolymer, and an organic solvent blend of polyalkylene glycol dialkyl ether and cyclic ester, which enhances ejection stability, intermittent ejection properties, and drying properties while minimizing odor.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If printing speed is increased by increasing ejection number per unit time, then productivity is improved, but ejection stability deteriorates and nozzle clogging occurs
Solution Approach 1:
The patent changes the chemical parameters of the ink composition by selecting specific binder resin combinations (acrylic resin with vinyl chloride-vinyl acetate copolymer or fibrous resin) and solvent ratios (cyclic ester 3-10 parts, ethylene glycol alkyl ether acetate ≤5 parts per 100 parts ink). These parameter changes optimize the balance between ejection stability and drying performance, enabling high-speed printing without nozzle clogging
Solution Approach 2:
The patent uses composite material strategies by combining multiple binder resins (acrylic resin + vinyl chloride-vinyl acetate copolymer, or acrylic resin + fibrous resin) and multiple solvents (cyclic ester + polyalkylene glycol dialkyl ether + ethylene glycol alkyl ether acetate). This composite approach creates synergistic effects that simultaneously improve ejection stability, drying property, and alcohol resistance
2Productivity
If drying property is enhanced to allow winding after printing, then productivity is improved, but odor increases due to increased solvent volatilization
Solution Approach 1:
The patent carefully controls the content ratios of volatile solvents to balance drying speed and odor. Specifically, cyclic ester is limited to 3-10 parts and ethylene glycol alkyl ether acetate to ≤5 parts per 100 parts ink. This parameter optimization ensures sufficient drying property for post-printing winding while minimizing odor from solvent volatilization
Solution Approach 2:
The patent introduces polyalkylene glycol dialkyl ether as an intermediary solvent that facilitates drying without contributing significantly to odor. This mediator component helps achieve the drying property needed for winding while the controlled amounts of cyclic ester and ethylene glycol alkyl ether acetate minimize harmful volatilization
3Reliability
If alcohol resistance is improved, then reliability is improved, but manufacturing complexity increases due to additional resin components
Solution Approach 1:
The patent achieves alcohol resistance through composite binder resin systems: acrylic resin combined with vinyl chloride-vinyl acetate copolymer, or acrylic resin combined with fibrous resin. These composite materials provide the necessary alcohol resistance for applications like wall surfaces while maintaining manageable formulation complexity through established resin combinations
4Manufacturing precision
If content ratio of vinyl chloride-vinyl acetate copolymer is increased to improve optical density, then image quality is improved, but solubility issues occur with existing solvents
Solution Approach 1:
The patent resolves solubility issues by changing the solvent composition parameters: using cyclic ester in controlled amounts (3-10 parts), polyalkylene glycol dialkyl ether as base solvent, and limiting ethylene glycol alkyl ether acetate (≤5 parts). This parameter optimization enables high vinyl chloride-vinyl acetate copolymer content for improved optical density while maintaining adequate solubility and preventing precipitation
Data Source
AI summary
The present invention provides an ink composition for inkjet recording with which high-speed printing is possible while maintaining the quality of a printed material. An ink composition for inkjet recording, including: a color material, a binder resin, and an organic solvent, wherein the binder resin contains at least an acrylic-based resin (A), and a copolymer (B) having a constitutional unit derived from a hydroxyalkyl (meth)acrylate, a constitutional unit represented by the following general formula (I), and a constitutional unit represented by the following general formula (II), a content ratio by mass of the acrylic-based resin (A) to the copolymer (B) ((A)/(B)) is 25/75 or more and 70/30 or less, and wherein the organic solvent contains at least a polyalkylene glycol dialkyl ether and a cyclic ester, a content ratio of the cyclic ester is 3 parts by mass or more and 10 parts by mass or less relative to 100 parts by mass of the ink composition, and a content ratio of the polyalkylene glycol dialkyl ether is 5 parts by mass or less relative to 100 parts by mass of the ink composition: wherein each symbol in the general formula (I) and the general formula (II) is as described in the description).