Xanthene Polyimide Film Composition for Low-Haze Heat Resistance

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Solution Overview

Problem

Existing polyimides used in electronic devices face challenges in achieving high transparency and heat resistance while minimizing internal stress, particularly when used in high-temperature processes and transparent displays.

Innovation Solution

A polyimide precursor composition containing specific structural units and organic solvents, which includes xanthene structures with hexafluoroisopropylidene and fluorenyl groups, is used to produce a polyimide film with reduced internal stress and enhanced transparency, utilizing a combination of tetravalent and divalent organic groups to improve solubility and linearity.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Temperature

If a conventional aromatic polyimide is used to ensure heat resistance, then heat resistance is improved, but transparency deteriorates due to yellowish-brown coloration

Engineering Contradiction:

Improveheat resistanceVSAvoidtransparency

Core Design Contradiction:

TemperatureVSIllumination intensity

Solution Approach 1:

The patent changes the chemical structure parameters of the polyimide by introducing specific monomers (1,4-phenylenediamine and 2,3-xylylenediamine) to modify the polyimide's optical properties while maintaining its thermal stability, resolving the contradiction between heat resistance and transparency

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The patent creates a composite polyimide structure by combining conventional aromatic polyimide with specific diamine monomers that have different optical properties, achieving both heat resistance from the aromatic structure and transparency from the xylylene-containing structure

Inventive Principle:

Principle #40Composite materials

2Illumination intensity

If aliphatic monomers are used to suppress CT complex formation and improve transparency, then transparency is improved, but thermal decomposition temperature deteriorates

Engineering Contradiction:

ImprovetransparencyVSAvoidthermal decomposition temperature

Core Design Contradiction:

Illumination intensityVSTemperature

Solution Approach 1:

The patent applies local quality by introducing xylylene groups at specific positions within the polyimide chain to locally suppress CT complex formation and improve transparency, while maintaining the overall aromatic structure and thermal stability of the polyimide backbone

Inventive Principle:

Principle #3Local quality

Solution Approach 2:

The patent modifies the chemical composition parameters by incorporating specific ratios of 1,4-phenylenediamine and 2,3-xylylenediamine to optimize both transparency and thermal decomposition temperature simultaneously

Inventive Principle:

Principle #35Parameter changes

3Illumination intensity

If fluorine atoms are introduced to enhance transparency, then transparency is improved, but heat resistance requires improvement

Engineering Contradiction:

ImprovetransparencyVSAvoidheat resistance

Core Design Contradiction:

Illumination intensityVSTemperature

Solution Approach 1:

The patent changes the chemical composition by introducing fluorine-containing monomers (1,4-phenylenediamine and 2,3-xylylenediamine with fluorine substituents) that simultaneously provide transparency enhancement and maintain heat resistance through the fluorine atom's contribution to molecular stability

Inventive Principle:

Principle #35Parameter changes

4Illumination intensity

If xanthene structure is introduced to enhance transparency, then transparency is improved, but internal stress increases at the interface between polyimide film and support

Engineering Contradiction:

ImprovetransparencyVSAvoidinternal stress

Core Design Contradiction:

Illumination intensityVSStress or pressure

Solution Approach 1:

The patent optimizes the chemical structure parameters by controlling the content and arrangement of xanthene groups and fluorine atoms to reduce internal stress while maintaining transparency

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The patent creates a composite structure combining xanthene groups with fluorine-containing aromatic rings to achieve both transparency and reduced internal stress through the synergistic effect of these structural elements

Inventive Principle:

Principle #40Composite materials

Data Source

PatentUS20260001996A1Polyimide precursor composition, polyimide film, laminate, electronic device, method of producing laminate, method of producing polyimide film, and method of producing electronic device

Publication Date: 2026.01.01 KANEKA CORP

AI summary

A polyimide precursor composition contains a polyimide precursor and an organic solvent. The polyimide precursor has a structural unit into which a specific xanthene structure has been introduced. The imidization ratio of the polyimide precursor is 10 mol % or more and 100 mol % or less. The organic solvent may be one or more solvents selected from N-methyl-2-pyrrolidone, 1-butyl-2-pyrrolidone, 3-methoxy-N,N-dimethylpropanamide, 3-butoxy-N,N-dimethylpropanamide, N,N-dimethylpropionamide, N,N-diethylformamide and 1,3-dimethyl-2-imidazolidinone.