Graft Polyurethane Ink Dispersion for Durable Packaging Prints
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Inkjet printing on packaging materials poses challenges due to their unique size, color, translucency, and configuration, which affect print durability and reliability, necessitating improved ink compositions for versatile and durable printing solutions.
Innovation Solution
A graft polyurethane copolymer dispersion is developed, comprising a polyurethane backbone with a graft side-chain polymer, sulfonic acid groups, and isocyanate-generated amines, which includes poly(meth)acrylic moieties and polyalkylene oxide pendant groups, formulated into an ink composition with specific molar ratios and additives to enhance durability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional ink compositions are used for inkjet printing on packaging materials, then printing reliability is maintained, but print durability is insufficient under heat and pressure conditions
Solution Approach 1:
The patent employs a composite polymer structure consisting of a polyurethane backbone with grafted polyacrylic acid side chains. This composite architecture combines the thermal stability of polyurethane with the adhesion properties of polyacrylic acid, creating an ink composition that simultaneously achieves print durability and resistance to heat and pressure on packaging substrates.
Solution Approach 2:
The invention modifies the chemical composition parameters of the ink by incorporating specific functional groups (sulfonic acid groups and isocyanate-generated amines) into the polymer structure. These parameter changes enhance the ink's interaction with packaging materials and its stability under thermal and mechanical stress, thereby improving print durability without compromising reliability.
2Object-affected harmful factors
If ink compositions are formulated for enhanced durability, then resistance to heat and pressure improves, but printing reliability may be compromised
Solution Approach 1:
The patent applies local quality by creating distinct functional regions within the polymer molecule: the polyurethane backbone provides thermal stability for heat resistance, while the grafted polyacrylic acid side chains provide adhesion and compatibility with various packaging substrates. This localized functional distribution ensures both durability and printing reliability are achieved in different parts of the same molecular structure.
3Adaptability or versatility
If packaging materials with unique characteristics (size, color, translucency) are printed, then application versatility increases, but print durability becomes inconsistent
Solution Approach 1:
The patent achieves universality by designing an ink composition with multiple functional groups that can interact with diverse packaging materials. The polyurethane backbone provides general thermal stability, while the grafted polyacrylic acid side chains offer broad substrate compatibility across different colors, translucencies, and sizes. This multi-functional design enables consistent print durability across various packaging applications.
Data Source
AI summary
A graft polyurethane copolymer dispersion can include dispersed polyurethane particles including a graft polyurethane copolymer. The graft polyurethane copolymer in this example includes a polyurethane backbone, a graft side-chain polymer attached to the polyurethane backbone, sulfonic acid groups, and isocyanate-generated amines. The graft side-chain polymer can include a poly(meth)acrylic moieties with C1 to C12 alkyl pendant groups, polyalkylene oxide pendant groups, or a combination thereof.