Inkjet Curable Composition with Dual Curing for Extended Pot Life
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Solution Overview
Problem
Existing curable compositions for inkjet applications have issues with short pot life at elevated temperatures, increased viscosity due to thermal curing, and poor heat resistance and insulation reliability of cured products.
Innovation Solution
A curable composition comprising a photocurable compound, a thermally curable compound, a photopolymerization initiator, and a thermal curing agent, with a solvent content of 1% or less, which allows for prolonged pot life and improved heat resistance and insulation reliability, enabling precise pattern formation through inkjet application and subsequent curing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If a curable composition for inkjet contains a monomer having both a (meth)acryloyl group and a thermally curable functional group, then the composition can be cured by heating, but the pot life of the composition under an environment having a temperature of 50°C or higher is short
Solution Approach 1:
The curable composition is segmented into two distinct curing systems: a photocurable system using (meth)acryloyl groups for rapid initial curing, and a thermally curable system using epoxy groups for subsequent curing. This segmentation allows the composition to be stored stably at room temperature while enabling controlled curing at different stages, thus extending pot life while maintaining heating curability.
Solution Approach 2:
The composition undergoes preliminary photocuring upon light irradiation to form a partially cured state, which stabilizes the composition and prevents premature thermal curing. This preliminary action allows the composition to maintain stability during storage and handling at elevated temperatures, extending pot life while still enabling complete curing through subsequent heating.
2Ease of operation
If the inside of the inkjet device is warmed to 50°C or higher to improve dischargeability, then the viscosity of the composition decreases, but the curing of the composition proceeds in the inside of the inkjet device and the viscosity of the composition increases
Solution Approach 1:
The curing process is divided into periodic stages: first, the composition is discharged from the inkjet device at elevated temperature to ensure good dischargeability; then, the composition is irradiated with light to initiate photocuring; finally, heating is applied to complete the thermal curing. This periodic action prevents premature curing in the device while ensuring proper discharge and subsequent curing.
Solution Approach 2:
Light irradiation acts as an intermediary step between discharge and thermal curing. The photocurable (meth)acryloyl groups react upon light exposure to form a partially cured network that stabilizes the composition, preventing unwanted thermal curing during storage in the warmed inkjet device while maintaining dischargeability.
3Ease of manufacture
If conventional curable compositions for inkjet are used, then the composition can be applied by inkjet mode, but the heat resistance and insulation reliability of cured products after curing are poor
Solution Approach 1:
The curable composition employs a composite curing system combining photocurable (meth)acryloyl groups and thermally curable epoxy groups. This composite approach creates a crosslinked network structure that provides both good inkjet applicability and superior heat resistance and insulation reliability in the cured product, overcoming the limitations of conventional single-system compositions.
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 maintains stability and dischargeability at elevated temperatures, ensuring precise and efficient formation of fine resist patterns with enhanced heat resistance and insulation properties.
Implementation Method 1
irradiated with light to make the curing thereof proceed
Implementation Method 2
cured by heating upon use
Data Source
AI summary
Provided is a curable composition for inkjet which can have a prolonged pot life even under an environment in an inkjet device that is warmed to 50°C or higher and which can be cured into a cured product having improved heat resistance and insulation reliability, in spite of the fact that a thermally curable compound is used in the curable composition. The curable composition for inkjet according to the present invention contains a photocurable compound, a thermally curable compound, a photopolymerization initiator and a thermal curing agent and does not contain a solvent or contains the solvent, wherein the content of the solvent in 100% by weight of the curable composition is 1% by weight or less when the curable composition for inkjet contains the solvent, the photocurable compound contains a polyfunctional compound having at least two (meth)acryloyl groups, and the thermal curing agent is an aromatic amine having at least one benzene ring and at least two amino groups.