Aqueous inks containing solvent dyes
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Solution Overview
Problem
Current inkjet inks for textile printing face challenges in achieving wide gamut and light-fastness, particularly in printing flags and banners, where ink must penetrate the fabric evenly and resist light fade, while avoiding lateral bleeding and blurring.
Innovation Solution
The development of an aqueous inkjet ink containing solvent dyes with specific structures, dispersed by a polymeric dispersant, along with a water-miscible organic solvent and a polymeric binder, which allows for even penetration and light resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If disperse dyes are used as colorants in digital inks for printing on polyester fabrics, then the ink can be printed on textile, but the color gamut and light-fastness are limited
Solution Approach 1:
The patent combines disperse dyes and solvent dyes in a single ink formulation to create a composite colorant system. This allows the ink to achieve both the light-fastness properties of disperse dyes and the wide color gamut of solvent dyes, resolving the contradiction between reliability and adaptability in textile printing applications
2Manufacturing precision
If ink is printed on one side of the fabric, then the image can be applied to the textile surface, but the ink must penetrate the fabric evenly without lateral bleeding or blurring
Solution Approach 1:
The patent employs different dye types with distinct properties: disperse dyes provide controlled penetration and fixation to the fabric fibers, while solvent dyes provide vibrant coloration. This local differentiation of dye functions within the same ink system enables even penetration without lateral bleeding, achieving manufacturing precision while preventing harmful effects
3Reliability
If conventional inkjet inks are used for flag and banner printing, then the printing process can be performed, but the images lack vibrancy and durability in sunny areas
Solution Approach 1:
The patent creates a composite ink formulation combining disperse dyes (providing durability and light-fastness) with solvent dyes (providing image vibrancy and color saturation). This composite approach allows the ink to maintain both reliability under sunny conditions and ease of manufacture with vibrant images, resolving the contradiction for flag and banner printing applications
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 ink achieves excellent color gamut and light-fastness, ensuring that images are vibrant and durable on textile substrates, particularly on synthetic polyamide fabrics like nylon, while maintaining stability and preventing blurring.
Implementation Method 1
a water-insoluble colorant dispersed by a polymeric dispersant
Implementation Method 2
aqueous vehicle and a water-insoluble colorant dispersed by a polymeric dispersant
Implementation Method 3
one or more solvent dyes having a structure of Formula I and one or more solvent dyes having a structure of Formula II
Implementation Method 4
ink is printed on one side, but must penetrate the fabric so that the image is equally visible on the back (unprinted) side as on the front (printed) side
Implementation Method 5
the ink must travel through the fabric
Implementation Method 6
a polymeric binder wherein said binder is different from said polymeric dispersant
Data Source
AI summary
The present invention pertains to an aqueous ink containing mixtures of solvent dyes and disperse dyes suitable for printing on hydrophobic textile substrates.