Electron Beam Curable Inkjet Ink for Food Packaging Safety
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Solution Overview
Problem
Existing inkjet ink compositions for food packaging lack sufficient adhesiveness to substrates and are prone to migration, with some containing harmful polymerization initiators that can transfer to food and pose health risks.
Innovation Solution
An electron beam curable inkjet ink composition comprising a monofunctional polymerizable compound with a weight average molecular weight of 100 to 400 and a hydroxyl group, a di- or higher functional polymerizable compound, and an unreactive resin, without organophosphorus compounds or polymerization initiators, ensuring adhesion and preventing migration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If polymerization initiators are included in the inkjet ink composition, then curing can be achieved, but harmful factors may transfer to food and pose health risks
Solution Approach 1:
The patent removes polymerization initiators and organophosphorus compounds from the inkjet ink composition, extracting the harmful components while maintaining the essential curing function through electron beam irradiation alone, which directly addresses the health safety concern by eliminating substances that could transfer to food
Solution Approach 2:
The patent changes the curing mechanism from chemical initiator-based polymerization to physical electron beam-induced polymerization, altering the fundamental parameter of how curing is achieved and eliminating the need for harmful chemical initiators
2Object-affected harmful factors
If the inkjet ink composition is designed for food packaging, then safety is improved, but adhesiveness to substrate may be insufficient
Solution Approach 1:
The patent optimizes the molecular weight and functional group composition of polymerizable compounds to achieve a balance between safety and adhesion, using specific ratios of monofunctional and di- or higher functional compounds to ensure both food safety and sufficient substrate adhesion
Solution Approach 2:
The patent creates a composite ink composition combining multiple polymerizable compounds with different functions (monofunctional for adhesion, di- or higher functional for crosslinking density) to simultaneously achieve food safety and strong substrate bonding
3Object-affected harmful factors
If the ink composition excludes polymerization initiators, then health safety is improved, but migration suppression may be compromised
Solution Approach 1:
The patent adjusts the molecular weight parameters of the polymerizable compounds to fall within specific ranges (100-400 for monofunctional, 350-700 for di- or higher functional) to optimize the polymer network structure, achieving both initiator elimination and effective migration suppression through proper molecular design
Solution Approach 2:
The patent uses a composite system of unreactive resin and polymerizable compounds in specific ratios to create a stable polymer matrix that prevents migration of components while maintaining the好处 of no initiators
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 composition achieves sufficient adhesion to substrates, prevents migration, and eliminates concerns about polymerization initiator transfer to food, ensuring safety and stability during curing.
Implementation Method 1
electron beam curable inkjet ink composition
Implementation Method 2
capable of being cured by irradiation with electron beam
Data Source
AI summary
Disclosed is an electron beam curable inkjet ink composition, including in 100 parts by mass thereof the following components a to c: a. 10 to 70 parts by mass of a monofunctional polymerizable compound having a weight average molecular weight of 100 to 400 and having a hydroxyl group; b. 10 to 75 parts by mass of a Afunctional polymerizable compound; and c. 0.1 to 10 parts by mass of an unreactive resin, wherein the electron beam curable inkjet ink composition does not include any of an organophosphorus compound, a polymerization initiator and a sensitizer, and has a viscosity of 30 mPa-s or less.