Polymeric Capsule Dispersion for Wash-Fast Textile Pigment Inks
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Solution Overview
Problem
Current textile printing inks require additional steaming and washing processes, consume significant water and energy, and use reactive chemistry like blocked isocyanates, which can negatively affect fabric properties and consumer safety.
Innovation Solution
Development of aqueous dispersions of capsules with dynamic covalent polymeric chains, specifically vinylogous-urethane, vinylogous-amide, and vinylogous-urea units, that form a shell around a core, allowing for effective binding of pigments to fibers without reactive chemistry, thus eliminating the need for steaming and washing processes and ensuring safer consumer products.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If reactive chemistry (blocked isocyanates, formaldehyde crosslinkers) is used to bind pigments to fibers, then wash fastness and adhesion are improved, but consumer safety and fabric properties deteriorate
Solution Approach 1:
The patent extracts and removes the harmful reactive chemistry components (blocked isocyanates, formaldehyde crosslinkers) from the ink formulation while maintaining pigment binding functionality through alternative non-reactive binding mechanisms, thus eliminating safety hazards while preserving wash fastness
Solution Approach 2:
The patent introduces intermediary substances such as polymeric binders and surfactants that mediate the binding between pigments and fibers without requiring reactive chemistry, serving as safe alternatives that achieve adhesion through physical rather than chemical bonding
2Reliability
If reactive chemistry (blocked isocyanates, formaldehyde crosslinkers) is used to bind pigments to fibers, then wash fastness and adhesion are improved, but fabric properties deteriorate
Solution Approach 1:
The patent removes harmful crosslinking agents from the system and replaces them with non-reactive binding mechanisms that achieve adequate adhesion without compromising fabric hand, breathability, and other intrinsic properties
Solution Approach 2:
The patent changes the binding mechanism from chemical reactions (crosslinking) to physical interactions (adsorption, entanglement, hydrogen bonding), fundamentally altering how pigments are fixed to fibers while preserving fabric quality
3Reliability
If traditional inkjet inks are used for textile printing, then pigment binding is achieved, but additional steaming and washing processes are required
Solution Approach 1:
The patent combines pigment binding, fixation, and finishing functions into a single ink formulation that cures or sets directly without requiring separate steaming and washing steps, integrating multiple process stages into one operation
Solution Approach 2:
The ink formulation contains self-sufficient binding and fixing components that automatically perform the binding function upon application and drying/curing, eliminating the need for external steaming and washing processes
4Reliability
If traditional textile printing processes are used, then pigment binding is achieved, but water and energy consumption increase
Solution Approach 1:
The patent extracts and eliminates the energy-intensive steaming and washing steps from the printing process by using inks that bind pigments through mechanisms that require minimal or no thermal treatment, significantly reducing energy consumption
Solution Approach 2:
The patent changes the curing or setting conditions from high-temperature steaming to lower-temperature drying or ambient curing, reducing the thermal energy input required while maintaining effective pigment binding
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 provides a sustainable and safe textile printing method that achieves satisfactory wash fastness and adhesion without the use of reactive chemistry, reducing water and energy consumption and enhancing fabric properties.
Implementation Method 1
capsules are composed of a shell surrounding a core, the resin comprising dynamic covalent polymeric chains, more specifically comprising at least one repeating unit of formula (I), (II), and/or (III)... to bind the pigments to the different types of fibre
Data Source
AI summary
An aqueous dispersion of capsules comprising a resin having at least one repeating unit of formula I, II and/or III and which is obtainable by contacting in a liquid comprising water, a compound A comprising at least 2 functional groups selected from the group of functional groups -X-C(=O)-CHR1-C(=O)-R2, -X-C(=O)-C≡C-R2; or -X-C(=O)-CR1=CR2-NR11 R12, with a compound B comprising at least two -NH2, -NH3+ or -N=C=O, wherein X, R1, R2, R3, R11 and R12 have the same meaning as that defined in the claims. The invention also includes a method of producing the aqueous dispersion and further relates to an aqueous ink jet ink comprising the resin capsules.