Inkjet Curable Composition for Printed Wiring Boards
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Solution Overview
Problem
The curable composition for inkjet described in existing patents has low heat resistance and non-uniformity issues due to separation of photo-cured and heat-cured components, leading to reliability concerns in printed wiring boards.
Innovation Solution
A curable composition for inkjet that cures by both light irradiation and heat addition, comprising a compound with (meth)acryloyl groups and cyclic ether groups, a photoreactive compound, a photopolymerization initiator, and a potential curing agent, with a viscosity range of 160 to 1200 mPa•s, improving heat resistance and uniformity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a curable composition for inkjet containing a monomer with (meth)acryloyl group and heat curable functional group, photoreactive diluent, and photopolymerization initiator is used, then the viscosity is low (150 mPa•s or less) and suitable for inkjet application, but the heat resistance of the cured product is low
Solution Approach 1:
The patent uses a composite monomer system containing both a monomer with (meth)acryloyl group and heat curable functional group, and a monomer with cyclic ether group. The photopolymerization initiator cures the (meth)acryloyl groups while the potential curing agent cures the cyclic ether groups, creating a composite cured product with improved heat resistance while maintaining low viscosity for inkjet application.
2Reliability
If a curable composition for inkjet is used that can be cured by both light irradiation and heat addition, then the heat resistance is improved, but the uniformity of the cured product film deteriorates due to separation of photo-cured and heat-cured components
Solution Approach 1:
The patent achieves homogeneous mixing of photo-cured and heat-cured components by using compatible monomers with (meth)acryloyl groups and cyclic ether groups that are molecularly mixed at the composition level. This prevents macroscopic separation while enabling dual-curing mechanisms, maintaining both heat resistance and uniformity of the cured product film.
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 improved heat resistance and uniformity of the cured product, enabling long-term reliability and high accuracy in forming fine resist patterns on electronic components like printed wiring boards.
Implementation Method 1
a photopolymerization initiator, wherein the compound having a (meth)acryloyl group and a cyclic ether group has one or two (meth)acryloyl groups
Implementation Method 2
a compound having a cyclic ether group other than the compound having a (meth)acryloyl group and a cyclic ether group, and a potential curing agent
Data Source
AI summary
Provided is a curable composition for inkjet capable of improving uniformity of a cured product film and heat resistance of a cured product. The curable composition for inkjet according to the present invention contains a compound having a (meth) acryloyl group and a cyclic ether group, a photoreactive compound, a compound having a cyclic ether group, a photopolymerization initiator, and a potential curing agent, the photoreactive compound and the compound having a cyclic ether group each are a compound other than the compound having a (meth)acryloyl group and a cyclic ether group, the compound having a (meth) acryloyl group and a cyclic ether group has one or two (meth) acryloyl groups, and the viscosity at 25°C of the curable composition for inkjet according to the present invention is 160 mPa•s or more and 1200 mPa•s or less.