Optical Waveguide Core Layer Photosensitive Resin Composition
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Solution Overview
Problem
Conventional optical waveguide core layer formation materials suffer from high loss and poor patternability due to thermal degradation caused by an expanded π-conjugated skeleton in photoacid generators, leading to reduced transparency and reflow resistance.
Innovation Solution
A photosensitive resin composition with a photoacid generator having a contracted π-conjugated cationic skeleton, characterized by an absorption limit (O—O transition energy) of 3.5 to 4.1 eV, is used to reduce thermal degradation and enhance transparency, patternability, and reflow resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a photoacid generator with an expanded π-conjugated skeleton is used, then acid generation sensitivity by light-irradiation is improved, but absorption peak broadening occurs and loss reduction is prevented
Solution Approach 1:
The patent applies parameter changes by precisely controlling the absorption limit (O-O transition energy) of the photoacid generator to be within 3.5 to 4.1 eV. This specific parameter range ensures that the absorption peak remains sharp and does not broaden to longer wavelengths, thereby reducing optical loss while maintaining adequate acid generation sensitivity. The parameter optimization resolves the contradiction by finding the optimal energy window that balances both requirements.
2Manufacturing precision
If a photoacid generator with an expanded π-conjugated skeleton is used, then patternability is improved, but thermal degradation and coloration occur reducing reflow resistance
Solution Approach 1:
The patent utilizes parameter changes by optimizing the molecular structure of the photoacid generator to achieve a specific absorption limit range (3.5-4.1 eV). This structural parameter optimization prevents excessive π-conjugation expansion that would otherwise cause thermal degradation and coloration during reflow processing, thereby maintaining both patternability and reflow resistance.
Solution Approach 2:
The patent employs composite materials by formulating a resin composition that combines the optimized photoacid generator with specific resin components. This composite formulation enhances the overall stability and reflow resistance of the core layer formation material while preserving the patternability benefits of the photoacid generator.
3Use of energy by moving object
If a photoacid generator with an expanded π-conjugated skeleton is used, then sensitivity at exposure wavelength is improved, but transparency is reduced due to coloration
Solution Approach 1:
The patent applies parameter changes by defining a specific absorption limit range (3.5-4.1 eV) for the photoacid generator. This parameter control ensures that the photoacid generator maintains adequate sensitivity at the exposure wavelength (365 nm) while preventing absorption peak broadening that would cause coloration and reduce transparency in the cured core layer.
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 resin composition achieves lower loss, higher transparency, and improved reflow resistance in the optical waveguide core layer, making it suitable for hybrid flexible printed wiring boards for optical/electrical transmission.
Implementation Method 1
a photoacid generator having an expanded π-conjugated skeleton and imparted with acid generation sensitivity by light-irradiation for photocurable patternability
Implementation Method 2
photocurable film for formation of an optical waveguide core layer
Data Source
AI summary
The present invention provides an optical waveguide photosensitive resin composition containing a resin component and a photoacid generator, wherein the photoacid generator has a characteristic property (x) such that an absorption limit (O—O transition energy) calculated based on the shape of an ultraviolet spectrum obtained by spectrometrically analyzing a 0.1 wt % propylene carbonate solution of the photoacid generator by means of an ultraviolet/visible spectrophotometer is 3.5 to 4.1 eV. Where an optical waveguide core layer is formed by using the inventive optical waveguide photosensitive resin composition, for example, the optical waveguide core layer has a lower loss, and is excellent in patternability and reflow resistance.