Photocurable Ink Composition for PET Adhesion at Low LED Doses
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Solution Overview
Problem
Photocurable inkjet printing inks with high curability tend to have low adhesion to base materials like PET and PP, and existing solutions do not achieve sufficient curing with low integrated light doses, such as 500 mJ/cm2 or less, especially when using LED light sources.
Innovation Solution
A composition incorporating an acrylamide compound with a molecular weight of 150-250 and a monomer with a cyclic structure, which enhances curability and adhesion to base materials even at low integrated light doses, specifically using acrylamide compounds and monomers like acryloyl morpholine and isobornyl acrylate.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a photocurable inkjet printing ink composition with high curability is used, then curability is improved, but adhesion to base material deteriorates
Solution Approach 1:
The patent uses a composite monomer system combining cyclic structure monomers (providing adhesion through polar groups) with specific acrylamide compounds (providing curability). This composite approach allows the cured film to achieve both high adhesion to base materials like PET and PP, and high curability, resolving the contradiction between these two properties.
2Object-affected harmful factors
If LED light source with low integrated light dose is used, then environmental protection is improved, but curability deteriorates
Solution Approach 1:
The patent modifies the chemical composition parameters of the photocurable ink by incorporating specific cyclic structure monomers and acrylamide compounds with molecular weights of 150-250. This parameter change enables the composition to achieve sufficient curability even under low integrated light dose conditions (500 mJ/cm² or less) from LED sources, while maintaining environmental benefits.
3Use of energy by moving object
If adhesion improving component is added to photocurable inkjet printing ink composition, then adhesion to base material is improved, but curability deteriorates
Solution Approach 1:
The patent merges the adhesion-improving function and curability function into a single integrated monomer system. The cyclic structure monomers provide adhesion through polar groups, while the specific acrylamide compounds (molecular weight 150-250) provide curability. This merging eliminates the need to separately add adhesion improving components that would compromise curability.
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 excellent curability and adhesion to base materials like PET and PP with reduced viscosity, ensuring strong and stable cured products even with low energy LED curing, improving inkjet printing efficiency and material properties.
Implementation Method 1
radical polymerizable inks or cationic polymerizable inks have been used... polymerizable monomer, such as acrylic acid ester, and a polymerization initiator that generates radicals when active energy rays are applied
Data Source
AI summary
Provided is a composition including an acrylamide compound having a molecular weight of 150 or greater but 250 or less (A1), and a monomer having a cyclic structure represented by General Formula (3) below, or General Formula (4) below, or both (A2),where, in General Formulae (3) and (4), L is a single bond or a straight chain or branched alkylene group that has from 1 through 10 carbon atoms and may include an oxygen atom, a nitrogen atom, or a sulfur atom; A is a cyclic structure that has from 2 through 10 carbon atoms and may include an oxygen atom, a nitrogen atom, or a sulfur atom; R6 is a hydrogen atom or a methyl group; and R7 and R8 are each a straight chain or branched alkyl group having from 1 through 10 carbon atoms.