Photocurable Composition Conductivity for Drop Spreading
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Solution Overview
Problem
Inkjet Adaptive Planarization (IAP) and Nanoimprint Lithography (NIL) processes face challenges with electrostatic forces that interfere with drop spreading and template filling efficiency, leading to suboptimal processing and quality of photo-cured layers.
Innovation Solution
A photocurable composition comprising a polymerizable material, an organic ionic compound, and a photoinitiator, where the organic ionic compound includes an organic cation, such as diphenyliodonium hexafluorophosphate or 1-allyl-3-methylimidazolium dicyanamide, with a conductivity of at least 20 μS/cm, is used to counterbalance electrostatic forces, improving drop spreading and filling efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional photocurable compositions are used, then the composition maintains low conductivity, but electrostatic forces develop during IAP and NIL processing that repulse drops and interfere with drop spreading and template filling
Solution Approach 1:
The patent changes the electrical conductivity parameter of the photocurable composition by adding organic ionic compounds. The composition achieves a conductivity of at least 20 μS/cm (preferably at least 50 μS/cm) through the inclusion of specific amounts of organic ionic compounds (0.01-1.5 wt%), which fundamentally alters the electrical properties to counterbalance electrostatic forces during processing.
Solution Approach 2:
The patent creates a composite photocurable composition by combining polymerizable materials (acrylates, epoxies, silanes), organic ionic compounds (such as diphenyliodonium hexafluorophosphate, 1-allyl-3-methylimidazolium dicyanamide), and photoinitiators. This composite approach integrates materials with different functions: the polymerizable materials provide the base composition, the organic ionic compounds provide conductivity, and the photoinitiators enable curing.
2Reliability
If the amount of organic ionic compound is increased to improve conductivity, then electrostatic forces are better counterbalanced, but the composition may experience increased viscosity and reduced polymerization efficiency
Solution Approach 1:
The patent applies partial action by using small, controlled amounts of organic ionic compounds (0.01-1.5 wt%). This sufficient but not excessive amount achieves the desired conductivity improvement (at least 20 μS/cm, preferably at least 50 μS/cm) without causing adverse effects such as excessive viscosity increase or polymerization inhibition. The lower end of this range (0.01-0.1 wt%) is particularly effective for achieving the conductivity threshold.
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 inclusion of organic ionic compounds increases the conductivity of the photocurable composition, reducing electrostatic forces, enhancing drop spreading and template filling speed, while maintaining viscosity and strength of the photo-cured layers.
Implementation Method 1
an organic ionic compound... a conductivity of the photocurable composition may be at least 20 μS/cm... increases the conductivity of the photocurable composition, reducing electrostatic forces
Implementation Method 2
a photocurable composition comprising a polymerizable material, an organic ionic compound, and a photoinitiator... irradiating the photocurable composition with light to form a photo-cured layer
Data Source
AI summary
A photocurable composition can comprise a polymerizable material, an organic ionic compound and a photoinitiator, wherein an amount of the organic ionic compound may be not greater than 1.5 wt %, the organic ionic compound comprises an organic cation, and a conductivity of the photocurable composition can be at least 20 μS/cm. The photocurable composition can have an improved drop spreading and merging of drops in comparison to the same composition but not including the organic ionic compound.