Impermeable-Base Inkjet Ink Composition for Retort-Resistant Laminates
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Solution Overview
Problem
Existing ink jet inks for impermeable base materials fail to provide adequate retort resistance, which is the resistance to heating and pressurization sterilization at temperatures of 100°C or higher, when used to create laminates.
Innovation Solution
An ink jet ink composition comprising water, a pigment, a pigment dispersing resin with a first urethane resin, and resin particles with a second urethane resin, where both resins contain polyol units without acid groups and have a glass transition temperature difference of 40°C or lower, along with a specific acid value range, is used to improve the retort resistance of laminates.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional ink jet ink is used for impermeable base material, then image recording is achieved, but retort resistance of the laminate is insufficient
Solution Approach 1:
The ink jet ink employs a composite resin system comprising both urethane resin and polyester resin, where the urethane resin provides flexibility and adhesion while the polyester resin contributes to heat resistance and dimensional stability. This composite approach enables the ink film to withstand retort treatment (100°C or higher heating and pressurization) without causing laminate floating or peeling, thereby achieving reliable retort resistance while maintaining manufacturability through established ink formulation processes.
2Strength
If urethane resin is used to improve flexibility and adhesion, then lamination floating is reduced, but heat resistance may be compromised
Solution Approach 1:
The patent carefully controls the glass transition temperature difference between the urethane resin and polyester resin components to 40°C or lower, and specifies that both resins must contain polyol units without acid groups with a proportion of 60 mol% or more. This parameter optimization ensures that the urethane resin provides necessary flexibility and adhesion while the polyester resin component maintains heat resistance, allowing the ink film to withstand retort treatment without compromising either adhesion or thermal stability.
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 composition enhances the flexibility and adhesion of the laminate, reducing lamination floating during retort treatment, thereby improving the retort resistance of the laminate.
Implementation Method 1
the ink composition enhances the flexibility and adhesion of the laminate, reducing lamination floating during retort treatment
Implementation Method 2
a pigment dispersing resin containing a first urethane resin, and resin particles containing a second urethane resin
Implementation Method 3
resistance to heating and pressurization sterilization at a temperature of 100° C. or higher
Implementation Method 4
the retort resistance is resistance to treatment under more severe temperature conditions and more severe pressure conditions than the boiling resistance
Data Source
AI summary
There is provided an ink jet ink for an impermeable base material, which can improve retort resistance of a laminate obtained by laminating a base material for lamination on an image of an image recorded material obtained by applying an ink jet ink onto an impermeable base material to record an image.