Cyclic Polysiloxane Photosensitive Composition for High-Heat Colored Patterns
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Solution Overview
Problem
Conventional photosensitive resin compositions face challenges in achieving both high heat resistance and patternability, particularly when the content of coloring agents is increased to improve light shielding properties, as this often leads to reduced dispersibility and alkali developability.
Innovation Solution
A photosensitive composition utilizing a cyclic polysiloxane compound with cationically polymerizable functional groups, such as alicyclic epoxy groups, and a photoacid generator, along with a solvent and a coloring agent, to form a thin film with enhanced heat resistance and patternability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If the content of coloring agent is increased to improve light shielding property, then light shielding property is improved, but dispersibility and alkali developability are reduced
Solution Approach 1:
The patent changes the chemical structure parameters of the binder polymer from conventional alkali-soluble acrylic resin to polysiloxane compound with specific cyclic structure and cationically polymerizable functional groups. This parameter change allows the system to accommodate higher coloring agent content while maintaining both dispersibility and alkali developability, thus resolving the contradiction between light shielding property and patternability
Solution Approach 2:
The patent creates a composite material system combining polysiloxane compound with cationically polymerizable functional groups and coloring agents. This composite structure provides both the heat resistance characteristic of siloxane and the light shielding capability of high coloring agent content, while the cationically polymerizable groups enable subsequent photolithographic processing for precise patterning
2Temperature
If conventional binder polymer structure is modified to improve heat resistance, then heat resistance is improved, but dispersibility of coloring agent and alkali developability are reduced
Solution Approach 1:
The patent introduces local quality by incorporating cationically polymerizable functional groups at specific locations within the polysiloxane molecule. These localized functional groups provide the necessary reactivity for photolithographic processing and alkali developability, while the bulk polysiloxane structure maintains high heat resistance, thus resolving the contradiction between heat resistance and patternability
Solution Approach 2:
The polysiloxane compound serves multiple functions simultaneously: the siloxane backbone provides heat resistance, the cationically polymerizable functional groups enable photopolymerization and alkali developability, and the overall structure maintains good dispersibility for coloring agents. This multi-functionality resolves the contradiction between heat resistance and patternability
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 excellent light shielding properties, heat resistance, and patternability, making it suitable for applications like colored patterns in display elements, while maintaining sufficient dispersibility of the coloring agent even at high content levels.
Implementation Method 1
A photosensitive composition utilizing a cyclic polysiloxane compound with cationically polymerizable functional groups, such as alicyclic epoxy groups, and a photoacid generator
Data Source
AI summary
A photosensitive composition contains a polysiloxane compound, a photoacid generator, a coloring agent and a solvent. A content of the coloring agent with respect to a total solid content of the composition is 5% by weight or more. The polysiloxane compound contains a cyclic polysiloxane structure and a cationically polymerizable functional group. The polysiloxane compound may further have an alkali-soluble functional group. A content of the polysiloxane compound with respect to the total solid content of the composition is preferably 20-80% by weight. The photosensitive composition is used, for example, in formation of a colored pattern.