Water-Based Ink Set for Jetting Stability and Color Vividness
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Solution Overview
Problem
Conventional water-based ink sets for ink-jet recording fail to achieve superior vividness, light resistance, ozone resistance, jetting stability, storage stability, and balanced hue retention among color inks, particularly yellow, magenta, cyan, and black inks, leading to bleeding issues between colors.
Innovation Solution
A water-based ink set comprising specific yellow, magenta, cyan, and black inks, each formulated with unique dye compositions and solvents, including C.I. Direct Yellow 86, C.I. Direct Yellow 132, C.I. Direct Yellow 142, magenta dyes represented by general formulas, and cyan dyes, optimized with specific solvent ratios and additives to enhance color properties and stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional water-based ink formulations are used, then ease of manufacture is maintained, but color vividness, light resistance, and storage stability are insufficient
Solution Approach 1:
The patent uses composite dye formulations combining multiple specific dyes (C.I. Direct Yellow 86, C.I. Direct Yellow 132, C.I. Direct Yellow 142 for yellow; C.I. Acid Red 1, C.I. Acid Red 254 for magenta; C.I. Direct Blue 86 for cyan) with carbon black for black ink. This composite approach achieves superior color vividness, light resistance, and storage stability while maintaining manufacturing feasibility through standardized production processes.
2Reliability
If conventional ink formulations are used, then device complexity is low, but bleeding between colors occurs and jetting stability is poor
Solution Approach 1:
The patent optimizes specific parameters including pH values (yellow ink: 4.5-6.5, magenta ink: 4.0-6.0, cyan ink: 4.5-6.5, black ink: 5.0-7.0), viscosity ranges (yellow: 1.5-3.0 cP, magenta: 1.5-3.0 cP, cyan: 1.5-3.0 cP, black: 1.5-3.0 cP), and solvent composition ratios to achieve superior jetting stability and prevent color bleeding while maintaining a manageable ink set configuration.
3Duration of action of stationary object
If conventional ink formulations are used, then storage requirements are simple, but storage stability deteriorates over time
Solution Approach 1:
The patent incorporates preliminary stabilizing measures including pH adjustment to optimal ranges, addition of specific additives (surfactants, humectants, preservatives), and viscosity optimization during ink formulation. These preliminary actions ensure long-term storage stability (maintaining color properties and jetting performance) without requiring complex storage infrastructure, as the inks are pre-conditioned for stability.
4Reliability
If conventional dye combinations are used, then ink formulation is simple, but hues in balance after fading are poor
Solution Approach 1:
The patent applies local quality optimization by selecting specific dyes with complementary fading characteristics for each color channel. The yellow ink uses C.I. Direct Yellow 86, C.I. Direct Yellow 132, and C.I. Direct Yellow 142; magenta ink uses C.I. Acid Red 1 and C.I. Acid Red 254; cyan ink uses C.I. Direct Blue 86. This targeted selection ensures that when dyes fade, the relative hue relationships are maintained, achieving superior color balance after fading.
Data Source
AI summary
There is provided a water-based ink set for ink-jet recording, including: a water-based yellow ink which contains water, a water-soluble organic solvent and a yellow colorant containing a yellow dye (Y-1) and a yellow dye (Y-2) indicated below; a water-based magenta ink which contains water, a water-soluble organic solvent and a magenta colorant containing a magenta dye (M-1) and a magenta dye (M-2) indicated below; a water-based cyan ink which contains water, a water-soluble organic solvent and a cyan colorant containing a cyan dye (C-1) indicated below; and a water-based black ink which contains water, a water-soluble organic solvent and a black colorant containing carbon black.