Photocurable Composition for Inkjet Planarization
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Solution Overview
Problem
Current inkjet adaptive planarization materials lack high thermal stability, which is essential for planarized layers subjected to subsequent processing steps like baking and etching.
Innovation Solution
A photocurable composition comprising a polymerizable material with a combination of 1,3-benzoxazine and acrylate monomers, specifically designed to have a viscosity of not greater than 20 mPa·s, which forms a cured layer with exceptional thermal stability up to 320°C when treated at a heating rate of 10°C/min, with a weight loss of not greater than 1.2%.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional photocurable materials are used for inkjet adaptive planarization, then the material can be applied and cured, but the cured layer lacks high thermal stability for subsequent processing steps
Solution Approach 1:
The patent employs a composite material system combining benzoxazine monomers (providing thermal stability) with acrylate monomers (providing photocurability and low viscosity). This composite approach resolves the contradiction by integrating materials with complementary properties to achieve both thermal stability and ease of manufacture through established inkjet and UV curing processes
Solution Approach 2:
The patent optimizes specific parameters including the ratio of benzoxazine to acrylate monomers, molecular weight of monomers, and UV initiator concentration to achieve the desired balance. By adjusting these parameters, the formulation achieves high thermal stability while maintaining low viscosity and proper reactivity for inkjet dispensing and UV curing
2Ease of operation
If the composition has low viscosity for inkjet dispensing, then the material can be easily applied, but achieving high thermal stability becomes more difficult
Solution Approach 1:
The patent adjusts molecular weight and chemical structure parameters of the monomers to achieve low viscosity while incorporating sufficient benzoxazine content for thermal stability. The specific parameter optimization includes selecting monomers with appropriate chain lengths and functional groups that balance fluidity and thermal performance
Solution Approach 2:
The composite of low-viscosity acrylate monomers with benzoxazine monomers creates a synergistic effect where the acrylate provides the fluidity needed for inkjet dispensing while the benzoxazine contributes thermal stability to the cured network
3Reliability
If high content of 1,3-benzoxazine monomer is used to improve thermal stability, then thermal stability improves, but viscosity increases making inkjet dispensing difficult
Solution Approach 1:
The patent optimizes the concentration parameter of benzoxazine monomer within a specific range and adjusts the molecular weight parameter of both monomer types to maintain low viscosity while achieving sufficient thermal stability. The optimization identifies the critical threshold where thermal benefits are maximized without excessive viscosity increase
Solution Approach 2:
The composite material system uses acrylate monomers as a viscosity-reducing component that allows higher benzoxazine content for thermal stability. The two monomer types work synergistically where the acrylate maintains processability while the benzoxazine provides the required thermal performance
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 a high thermal stability in the cured layers, allowing for reliable processing of substrates in semiconductor manufacturing and other applications, with a weight loss of less than 0.7% during high-temperature treatment, enhancing the durability and performance of planarized surfaces.
Implementation Method 1
irradiating the photocurable composition with light to form a photo-cured layer
Data Source
AI summary
A photocurable composition can comprise a polymerizable material and an initiator. The polymerizable material can comprise at least one 1,3-benzoxazine monomer and at least one acrylate monomer, and may have a viscosity of not greater than 20 mPa·s. The photocurable composition can be suitable for use in inkjet adaptive planarization and is adapted to form cured layers having exceptional heat stability up to 320° C.