Imide Ring Polymer Charge Control for Hydrolysis Resistance
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Solution Overview
Problem
Conventional negative-type photosensitive polymers experience reduced mechanical strength due to hydrolysis and require improved solubility in organic solvents.
Innovation Solution
A negative-type photosensitive polymer with a structural unit containing an imide ring and a specific terminal group, where the average positive electric charge of carbonyl carbons is within a predetermined range, inhibiting hydrolysis and enhancing solubility in organic solvents.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional negative-type photosensitive polymer is used, then photosensitivity is achieved, but mechanical strength is reduced due to hydrolysis
Solution Approach 1:
The patent changes the chemical structure parameters of the polymer by controlling the positive electric charge (δ+) of carbonyl carbons in the imide ring to be within a specific range (0.085-0.095). This parameter optimization reduces the polymer's susceptibility to hydrolysis while maintaining photosensitivity, thereby preserving mechanical strength and elongation properties.
2Adaptability or versatility
If conventional negative-type photosensitive polymer is used, then photosensitivity is achieved, but solubility in organic solvents is insufficient
Solution Approach 1:
The patent optimizes the chemical structure parameters by adjusting the positive electric charge (δ+) of carbonyl carbons within a specific range (0.085-0.095), which simultaneously improves solubility in organic solvents while maintaining photosensitivity. This parameter control allows the polymer to form stable varnishes with common solvents without sacrificing photosensitive properties.
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 solution provides a polymer with excellent mechanical strength and solubility, minimizing the reduction in elongation and maintaining mechanical properties in cured films.
Implementation Method 1
negative-type photosensitive polymer, polymer solution, negative-type photosensitive resin composition, cured film
Data Source
AI summary
A negative-type photosensitive polymer of the present invention is a solvent-soluble negative-type photosensitive polymer which has a structural unit containing an imide ring and contains a group represented by General Formula (t) at at least one of both terminals, in which an average value of positive electric charges (δ+) of two carbonyl carbons of the imide ring is equal to or less than 0.095 as calculated by a charge equilibration method.