DEAC and M3DMPA Solvent Blend for Photoresist Stripping
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Solution Overview
Problem
Current polar solvents used in the electronics industry for cleaning and stripping electronic parts, such as N-methyl-2-pyrrolidone, pose reproductive toxicity concerns and regulatory challenges, necessitating the development of safer alternatives that maintain performance.
Innovation Solution
A solvent system comprising N,N-diethylacetamide (DEAC) and 3-methoxy-N,N-dimethylpropionamide (M3DMPA), optionally with glycol ethers or glycol ether acetates, which forms a binary blend or is combined with acyclic or cyclic amides to effectively remove photoresist from substrates.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If NMP and similar polar solvents are used for cleaning and stripping electronic parts, then cleaning and stripping performance is achieved, but reproductive toxicity and safety concerns arise
Solution Approach 1:
The patent changes the chemical composition parameters by replacing NMP with a specific blend of DEAC (40-80 wt%) and M3DMPA (20-60 wt%), which maintains the required solvency and stripping performance while eliminating reproductive toxicity. This parameter substitution resolves the contradiction between performance and safety.
Solution Approach 2:
The patent creates a composite solvent system by combining DEAC and M3DMPA in specific proportions, forming a new solvent blend that achieves the desired cleaning and stripping effects while improving safety profile. The composite nature of this solvent blend allows it to maintain functionality without the harmful properties of individual components.
2Productivity
If NMP is used extensively in the electronics industry, then cleaning and stripping tasks are completed efficiently, but regulatory restrictions increase
Solution Approach 1:
The patent modifies the solvent composition parameters to comply with regulatory restrictions on NMP while maintaining cleaning and stripping efficiency. By formulating a new blend with DEAC and M3DMPA, the patent achieves productivity goals without violating regulatory frameworks.
Solution Approach 2:
The patent adopts a safer, more compliant solvent formulation that may have shorter operational lifespan or different handling requirements compared to NMP, but this trade-off enables continued productivity while avoiding regulatory penalties and safety issues associated with NMP usage.
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 solvent system achieves equivalent cleaning and stripping performance to NMP while offering a better environmental profile, ensuring efficient removal of photoresist and compatibility with electronic materials, thus addressing safety and regulatory concerns.
Implementation Method 1
A solvent system comprising N,N-diethylacetamide (DEAC) and 3-methoxy-N,N-dimethylpropionamide (M3DMPA)... which forms a binary blend or is combined with acyclic or cyclic amides to effectively remove photoresist from substrates
Implementation Method 2
NMP and similar solvents are used in the electronics industry for cleaning electronic parts and equipment of contaminants
Data Source
AI summary
A solvent consisting essentially of: (A) a first component consisting of N,N-diethylacetamide (DEAC); (B) a second component consisting of 3-methoxy-N, N-dimethyl propionamide (M3DMPA); and (C) an optional third component consisting of one or more glycol ethers or glycol ether acetates; or a solvent consisting essentially of: (1) a first component consisting of one or more acyclic amides of Formula (I): and (2) an optional second component consisting of one or more of DEAC, M3DMPA, N,N-dimethylpropionamide, one or more glycol ethers or glycol ether acetates, and one or more cyclic amides of Formulae (II-IV).