Non-aqueous Ink Jet Composition with Controlled Water Content
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Solution Overview
Problem
Non-aqueous ink jet compositions containing diketopyrrolopyrrole pigments face issues with uneven aggregation and poor storage stability due to high hygroscopic properties of glycol ethers and contamination with water, leading to insufficient intensity and stability in recorded matter.
Innovation Solution
A non-aqueous ink jet composition with a diketopyrrolopyrrole pigment and a glycol ether, where the water content is regulated to 10 mass% or less, and an inorganic metal is included in an amount of 100 mass ppm or less to prevent aggregation and maintain dispersibility, ensuring excellent storage stability and intensity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If glycol ether is used as organic solvent to prevent uneven aggregation, then dispersibility is improved, but water absorption increases due to high hygroscopic property
Solution Approach 1:
The patent changes the water content parameter from unrestricted to specifically controlled at 10 mass% or less. This parameter change resolves the contradiction by allowing glycol ether to maintain its dispersibility benefits while limiting water absorption to levels that prevent deterioration of storage stability
Solution Approach 2:
The patent applies preliminary anti-action by proactively controlling water content to 10 mass% or less before water-induced deterioration can occur. This preventive measure counteracts the hygroscopic nature of glycol ether by establishing a water content threshold that prevents the harmful effects of excessive water absorption
2Illumination intensity
If diketopyrrolopyrrole pigment is used to achieve excellent intensity, then color intensity is improved, but uneven aggregation occurs resulting in insufficient recorded matter intensity
Solution Approach 1:
The patent uses glycol ether as an intermediary substance between the diketopyrrolopyrrole pigment particles and the dispersion medium. The glycol ether mediates the interaction by providing steric stabilization and preventing direct pigment-pigment aggregation, thereby maintaining both high color intensity and uniform dispersion
Solution Approach 2:
The patent creates a composite dispersion system combining diketopyrrolopyrrole pigment with glycol ether and controlled water content. This composite approach leverages the high chroma of the pigment while using the glycol ether matrix to prevent aggregation, achieving both excellent color intensity and dispersion uniformity
3Stability of the object's composition
If water content is increased to improve dispersibility, then pigment dispersion is improved, but storage stability deteriorates due to contact with water
Solution Approach 1:
The patent optimizes the water content parameter to a specific range (10 mass% or less) that balances dispersibility and storage stability. This parameter optimization resolves the contradiction by identifying the threshold water content level that provides sufficient dispersion while preventing water-induced deterioration during storage
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The composition effectively prevents uneven aggregation of diketopyrrolopyrrole pigments, maintaining high dispersibility and storage stability while achieving excellent intensity in recorded matter.
Implementation Method 1
a non-aqueous ink jet composition including a pigment component at least containing a diketopyrrolopyrrole pigment and a specific organic solvent... the organic solvent contains a glycol ether
Implementation Method 2
a diketopyrrolopyrrole pigment has high hydrophobicity. Accordingly, a non-aqueous ink jet composition containing the pigment relatively readily deteriorates in dispersibility of the pigment by being in contact with water
Data Source
AI summary
A non-aqueous ink jet composition includes a pigment component containing a diketopyrrolopyrrole pigment and an organic solvent. The organic solvent contains a glycol ether. The amount of water in the non-aqueous ink jet composition is 10 mass% or less based on the total amount of the non-aqueous ink jet composition.