Stabilized Liquid Adhesion Composition for Nanoimprint Lithography
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Solution Overview
Problem
Spin-coatable adhesion materials in nanoimprint lithography face challenges with stability, viscosity, and unwanted gelation or particle formation during processing, necessitating improved quality and stability of liquid adhesion compositions.
Innovation Solution
A liquid adhesion composition comprising a polymerizable compound with at least two functional groups, a solvent, and a cross-linking agent with a specific structure that prevents premature reaction at room temperature, ensuring stability and preventing unwanted polymerization, along with a catalyst for curing at elevated temperatures, results in a stable and effective adhesion layer for nanoimprint lithography.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a liquid adhesion composition contains reactive components for forming an adhesion layer, then the adhesion layer can be formed effectively, but the composition may undergo unwanted polymerization or gelation during storage or processing
Solution Approach 1:
The patent applies preliminary action by incorporating a stabilizer into the liquid adhesion composition before use. The stabilizer pre-prevents unwanted polymerization reactions during storage and processing, allowing the reactive components (cross-linking agent and polymerizable compound) to remain stable until the intended curing step. This resolves the contradiction by enabling the composition to maintain stability while still containing all necessary components for effective adhesion layer formation.
2Reliability
If the liquid adhesion composition is designed to cure at elevated temperatures, then stable adhesion is achieved, but the composition must remain stable and non-viscous at room temperature during handling
Solution Approach 1:
The patent applies parameter changes by designing a composition where the key parameters (reactivity, viscosity, molecular weight distribution) are temperature-dependent. At room temperature, the stabilizer maintains low reactivity and appropriate viscosity for easy handling and spin-coating. Upon heating to the curing temperature, the stabilizer decomposes or becomes inactive, allowing the cross-linking reaction to proceed rapidly, forming a stable adherent layer. This resolves the contradiction between handling ease and adhesion quality.
3Ease of operation
If the composition viscosity is kept low for easy spin-coating, then the composition is easy to apply, but particle formation or gelation may occur more readily during processing
Solution Approach 1:
The patent applies the intermediary principle by introducing a stabilizer that acts as a protective mediator between the reactive components (cross-linking agent and polymerizable compound) and the unwanted polymerization reactions. The stabilizer allows the composition to maintain low viscosity for easy spin-coating while simultaneously preventing particle formation and gelation during processing. The stabilizer mediates the system's stability without interfering with the intended curing process, resolving the contradiction between ease of application and prevention of harmful effects.
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 exceptional stability at room temperature, prevents unwanted particle formation, and ensures a thin, uniform adhesion layer, enhancing the quality and reliability of nanoimprint lithography processes by maintaining the composition's fluidity and preventing premature curing.
Implementation Method 1
a cross-linking agent, wherein the cross-linking agent has a structure of Formula (1)... the cross-linking agent can have a structure wherein A is C1-3 alkyl, Y is branched C3-5 alkyl; R is C1-3 alkyl, n1 is 2-6, and n2 is 2 or 3
Implementation Method 2
a catalyst; and a cross-linking agent... curing the liquid adhesion composition by cross-linking the polymerizable compound with the cross-linking agent to form a solid adhesion layer
Implementation Method 3
The composition achieves exceptional stability at room temperature, prevents unwanted particle formation, and ensures a thin, uniform adhesion layer, enhancing the quality and reliability of nanoimprint lithography processes by maintaining the composition's fluidity and preventing premature curing
Data Source
AI summary
A liquid adhesion composition can include at least one polymerizable compound comprising at least two functional groups; a solvent; a catalyst; and a cross-linking agent, wherein the cross-linking agent can have a structure of Formula (1): A [X—(O—Y—)n1—N(CH2—OR)2]n2 (1), wherein A is an alkyl group, or an aromatic group, or a heteroaromatic group; X is C1-5 alkyl, Y is C1-4 linear or branched alkyl; n1 is 1-10; R is C1-6 alkyl; and n2 is 1-6. The liquid adhesion composition can be cured at elevated temperatures and may be applied in nanoimprint lithography for attaching an imprint resist layer on a substrate.