Curable Composition for Faster, Accurate Fine Pattern Transfer
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Solution Overview
Problem
Conventional pattern forming methods face issues such as mold breakage due to foreign substances and prolonged filling times due to trapped bubbles, leading to reduced productivity and inaccurate pattern transfer, especially in micron-scale semiconductor and MEMS fabrication.
Innovation Solution
A curable composition comprising a polymerizable compound with cyclic structures, a photopolymerization initiator, and a solvent, with specific viscosity ranges and solvent content, allowing for rapid formation of a continuous liquid film and minimizing mold breakage and bubble formation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a curable composition is used in conventional pattern forming methods, then the pattern can be transferred to the substrate, but foreign substances cause mold breakage and bubbles increase filling time
Solution Approach 1:
The patent modifies the physical and chemical parameters of the curable composition, specifically controlling viscosity within 1-100 cP at room temperature and adjusting solvent content to 5-90 vol%, to optimize both mold release properties and bubble elimination, thereby simultaneously improving mold durability and filling time
Solution Approach 2:
The patent creates a composite curable composition system combining polymerizable compounds (acrylates, methacrylates, vinyl ethers), photopolymerization initiators, and specific solvents (alcohols, esters, ethers, ketones) with cyclic structures containing aromatic or aromatic heterocyclic groups, where each component contributes to reducing foreign substance adhesion and minimizing bubble formation
2Manufacturing precision
If the viscosity of the curable composition is reduced to improve filling, then the composition spreads too much before molding, but if viscosity is increased to control spreading, then filling time increases
Solution Approach 1:
The patent precisely controls viscosity parameters within 1-100 cP at room temperature and adjusts the composition ratios of polymerizable compounds and solvents to achieve optimal balance between pre-spreading control and filling speed, enabling accurate pattern transfer without excessive spreading or prolonged filling
3Manufacturing precision
If a mold with fine concave-convex pattern is pressed against the curable composition to transfer the pattern, then fine patterns can be formed, but foreign substances trapped between mold and substrate cause breakage
Solution Approach 1:
The patent adjusts the viscosity parameter to 1-100 cP and controls solvent content at 5-90 vol% to optimize the curable composition's flow and release characteristics, reducing foreign substance adhesion to the mold surface and preventing mold breakage during fine pattern transfer
Solution Approach 2:
The curable composition acts as an intermediary substance with optimized physical properties that facilitates smooth mold release by reducing adhesion of foreign substances, protecting the mold from breakage while enabling fine pattern transfer
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 enables efficient and accurate pattern transfer with reduced mold breakage and faster filling times, enhancing productivity and precision in micron-scale fabrication.
Implementation Method 1
a photopolymerization initiator (b)
Implementation Method 2
by the capillary phenomenon, the curable composition fills concave portions that form the pattern of the mold
Data Source
AI summary
A curable composition contains a polymerizable compound, a photopolymerization initiator, and a solvent, wherein the curable composition has a viscosity of not less than 2 mPa·s and not more than 60 mPa·s at 23° C., the curable composition in a state in which the solvent is removed has a viscosity of not less than 30 mPa·s and not more than 10,000 mPa·s at 23° C., content of the solvent to the whole curable composition is not less than 5 vol % and not more than 95 vol %, and the polymerizable compound contains at least a compound having a plurality of cyclic structures, in which at least one of the cyclic structures is an aromatic structure or an aromatic heterocyclic structure.