Silicone Leveling Agent Composition for Smooth Resist Coatings
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Solution Overview
Problem
The environmental concerns associated with fluorine-based leveling agents in coating films have led to a need for non-fluorine-based alternatives that can impart high smoothness to coating films, particularly in the production of color filters for liquid crystal displays, while addressing issues such as film thickness unevenness and application defects.
Innovation Solution
A silicone chain-containing polymer is developed with specific polymerizable monomers, including a group represented by General Formula (A) and other monomers, ensuring a ratio of polymerizable monomer (a1) greater than 20% by mass, which enhances the smoothness of coating films.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If fluorine-based leveling agents are used to improve coating film smoothness, then film smoothness is improved, but environmental accumulation occurs
Solution Approach 1:
The patent changes the chemical composition parameters by replacing fluorine-based compounds with silicone-based compounds having specific molecular structures (Formula 1 or Formula 2). This substitution maintains the leveling function while eliminating environmental harm. The silicone compounds contain specific functional groups (methacryloyloxy, acryloyloxy) that enable polymerization and provide the desired film-smoothing effect without fluorine accumulation.
Solution Approach 2:
The patent employs silicone-based leveling agents that can be effectively used and then degraded, replacing persistent fluorine-based compounds. The silicone compounds serve their leveling function during coating application and curing, then do not accumulate in the environment like fluorine compounds, effectively acting as a non-persistent alternative.
2Object-affected harmful factors
If non-fluorine-based leveling agents like silicone compounds are used to avoid environmental accumulation, then environmental friendliness is improved, but coating film smoothness may be compromised
Solution Approach 1:
The patent creates a composite chemical structure combining silicone backbone chains with polymerizable functional groups (methacryloyloxy or acryloyloxy). This composite structure allows the silicone compound to serve dual functions: providing environmental friendliness through silicone-based composition and achieving effective leveling through the polymerizable groups that can cross-link and form smooth film surfaces.
Solution Approach 2:
The patent optimizes specific parameters of the silicone compound including molecular weight, functional group content, and structural configuration (Formula 1 or Formula 2). By carefully controlling these parameters, the compound achieves both environmental compatibility and sufficient film-smoothing capability through controlled polymerization during curing.
3Manufacturing precision
If coating film smoothness is improved to prevent pixel color unevenness, then color filter quality is improved, but application process complexity increases
Solution Approach 1:
The patent incorporates the leveling agent into the color resist composition before application, so that the smoothing action occurs during the normal coating and curing process. The silicone compound is pre-mixed with the resist materials, and upon application and exposure to UV light, it polymerizes and provides leveling action automatically, eliminating the need for separate smoothing steps.
Solution Approach 2:
The leveling agent functions autonomously during the coating process. When the composition is applied and exposed to UV light, the polymerizable groups in the silicone compound react and provide self-leveling action without requiring external intervention or additional processing steps. The system serves itself by incorporating the leveling function directly into the coating material.
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 silicone-based leveling agent provides high smoothness to coating films, enabling the production of color filters with reduced color unevenness and improved film quality, while being environmentally friendly by avoiding fluorine accumulation.
Implementation Method 1
a polymerizable monomer (a1) having a group containing a structure represented by General Formula (A) below
Data Source
AI summary
Provided is a leveling agent that can impart high smoothness to a coating film. A leveling agent is a silicone chain-containing polymer with at least a polymerizable monomer (a1) having a group containing a structure represented by General Formula (A) below (x indicates a number of repetition, with a number average of x being 20 or more) and a polymerizable monomer (a2) having one or more selected from the group consisting of a C1-18 alkyl group, a C6-18 aromatic group, a group containing a polyoxyalkylene chain, and a group containing a polyester chain as a polymeric component, a ratio of the polymerizable monomer (a1) in the polymeric component being greater than 20% by mass.