Printing agent, printing agent production method, and cloth article
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Solution Overview
Problem
Textile printing agents containing polyhalogenated metallophthalocyanine and diketopyrrolopyrrole pigments often form coarse particles, leading to white streaks and poor image definition, especially when using screen or ink-jet methods, due to the large specific gravity and primary particle diameter of these pigments, which complicates dispersion stability.
Innovation Solution
A textile printing agent is developed using a pigment dispersant with a specific polymer (A) that forms fine particles with a particle diameter of 5 to 1000 nm, having a number average molecular weight of 1,000 to 6,000 and an anionic group, which is neutralized to 100% with a basic compound, effectively reducing coarse particle formation and improving dispersibility.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If polyhalogenated metallophthalocyanine and diketopyrrolopyrrole pigments are used for textile printing, then color fastness and printing quality are improved, but coarse particle formation occurs leading to white streaks and poor image definition
Solution Approach 1:
The patent introduces a specific polymer dispersant as an intermediary substance between the pigment particles and the aqueous medium. This dispersant has a number average molecular weight of 1,000 to 6,000 and contains anionic groups that are neutralized to 100% with basic compounds. The dispersant forms fine particles with diameter of 5 to 1000 nm, acting as a mediator that prevents coarse particle formation while maintaining the color fastness properties of the pigments.
Solution Approach 2:
The patent applies parameter changes by precisely controlling the molecular weight range (1,000 to 6,000), the particle diameter (5 to 1000 nm), and the neutralization degree (100%) of the dispersant system. These parameter optimizations enable the dispersant to effectively prevent coarse particle formation of pigments with large specific gravity and primary particle diameter, thereby resolving the contradiction between color fastness and image definition.
2Stability of the object's composition
If conventional pigment dispersants are used, then pigment dispersion is achieved, but coarse particles are likely to be generated in the produced textile printing agent
Solution Approach 1:
The patent achieves effective pigment dispersion while preventing coarse particle formation by optimizing key parameters: the number average molecular weight of the polymer dispersant (1,000 to 6,000), the particle diameter of fine particles (5 to 1000 nm), and the neutralization degree of anionic groups (100%). These parameter changes enable stable pigment dispersion without generating coarse particles that would compromise image quality.
3Reliability
If pigments with large specific gravity and primary particle diameter are used, then color saturation and fastness are enhanced, but coarse particle formation increases making it difficult to reduce particle size
Solution Approach 1:
The patent employs a polymer dispersant as an intermediary that enables the use of pigments with large specific gravity and primary particle diameter while preventing coarse particle formation. The dispersant, with its specific molecular weight range and neutralized anionic groups, creates a stable fine particle system (5 to 1000 nm) that maintains the color fastness benefits of heavy pigments without their associated particle size problems.
Solution Approach 2:
The patent creates a composite dispersant system combining a polymer with specific molecular weight characteristics and neutralized anionic groups. This composite material approach allows the system to handle pigments with large specific gravity and primary particle diameter effectively, maintaining both color fastness and fine particle size through the synergistic properties of the composite dispersant structure.
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 solution suppresses coarse particle formation, preventing white streaks and enhancing the fastness to washing and rubbing of printed images, while maintaining excellent discharge stability in both screen and ink-jet printing methods.
Implementation Method 1
a number average molecular weight of 1,000 to 6,000 and an anionic group, which is neutralized to 100% with a basic compound
Implementation Method 2
forms fine particles with a particle diameter of 5 to 1000 nm
Implementation Method 3
effectively reducing coarse particle formation and improving dispersibility
Data Source
AI summary
An object to be achieved by the present invention is to provide a textile printing agent which has less coarse particles and which forms a printed portion having excellent printing properties, especially excellent fastness to washing and excellent fastness to rubbing. The present invention is directed to a textile printing agent which contains a polyhalogenated metallophthalocyanine pigment or a diketopyrrolopyrrole pigment, water, an organic solvent, a binder resin, and, as a pigment dispersant, a polymer (A) having an anionic group, a solubility in water of 0.1 g/100 ml or less, and a number average molecular weight of 1,000 to 6,000, wherein the polymer (A) forms fine particles in water when the polymer (A) is neutralized such that the neutralization rate of the anionic group by a basic compound is 100%.