Bismaleimide Curable Composition for High Thermal Stability
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Solution Overview
Problem
There is a need for improved Inkjet Adaptive Planarization (IAP) materials that produce planarized layers with high thermal stability, as existing materials do not adequately meet the requirements for thermal stability during subsequent processing steps.
Innovation Solution
A curable composition comprising a polymerizable material with a bismaleimide monomer and a photo-initiator, where the bismaleimide monomer constitutes between 5 wt% and 60 wt% of the total weight, combined with other monomers such as acrylate and divinylbenzene, forming a cured layer with high thermal stability up to 350°C, achieved through specific baking and irradiation processes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If conventional IAP materials are used, then the planarization process can be performed, but the thermal stability of the cured layer is insufficient for high-temperature processing steps
Solution Approach 1:
The patent changes the chemical composition parameters of the curable material by incorporating bismaleimide monomers (5-60 wt%) and divinybenzene (0.1-10 wt%) into the polymerizable material formulation. This chemical parameter modification enables the cured layer to maintain structural integrity at high temperatures (350°C), reducing weight loss to ≤2% during reheating while preserving planarization functionality.
Solution Approach 2:
The patent creates a composite curable composition by combining multiple monomer types (bismaleimide, acrylate, and divinybenzene) with photoinitiators. This composite material system synergistically achieves both the required low viscosity for inkjet dispensing and high thermal stability after curing, resolving the contradiction between processability and thermal performance.
2Temperature
If the bismaleimide monomer content is increased to improve thermal stability, then the cured layer's heat resistance improves, but the viscosity of the curable composition increases
Solution Approach 1:
The patent optimizes the concentration parameter of bismaleimide monomer within the specific range of 5-60 wt%, balancing thermal stability enhancement with viscosity control. Additionally, the inclusion of divinybenzene (0.1-10 wt%) as a flow-modifying component further adjusts the viscosity parameter, ensuring the curable composition remains suitable for inkjet dispensing while achieving the desired thermal performance.
Solution Approach 2:
The patent applies different functional components in specific proportions: bismaleimide monomers provide thermal stability, acrylate monomers maintain low viscosity and reactivity, and divinybenzene adjusts flow characteristics. This localized functional distribution within the composition achieves both high thermal stability and ease of dispensing operation.
3Temperature
If high thermal stability is achieved through material composition, then the cured layer can withstand 350°C processing, but the formulation complexity increases
Solution Approach 1:
The patent formulates a composite curable composition containing bismaleimide monomers (5-60 wt%), acrylate monomers (30-60 wt%), divinybenzene (0.1-10 wt%), and photoinitiators (1-10 wt%). This composite approach achieves high thermal stability (≤2% weight loss at 350°C) while maintaining relatively simple formulation and processing, as all components are mixed to achieve the target viscosity range for inkjet dispensing.
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 curable composition achieves a weight loss of not greater than 2% during reheating from 25°C to 350°C, demonstrating exceptional thermal stability and suitability for IAP processes.
Implementation Method 1
The flat liquid layer is typically solidified under UV light exposure
Implementation Method 2
a cured layer of the curable composition after being subjected to a baking treatment at 350° C. for 30 minutes under nitrogen
Data Source
AI summary
A curable composition can comprise a polymerizable material and a photo-initiator, wherein the polymerizable material can comprise a first monomer including at least one bismaleimide-monomer and at least one second monomer. The curable composition can have a viscosity of not greater than 30 mPa·s, and a cured layer of the curable composition can have a high thermal stability up to 350° C.