Inkjet-Printable Photo-Thermal Curing Composition for PCB
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Solution Overview
Problem
Existing ink compositions for printed wiring boards, particularly for inkjet printing, face challenges with high viscosity, low solid content, and difficulty in achieving desired film thickness due to solvent volatilization during curing, leading to inadequate adhesion, chemical resistance, and insulating properties.
Innovation Solution
A photocurable and thermally curable composition comprising a (meth)acryloyl group-containing monomer, block isocyanate, and photo-polymerization initiator, suitable for inkjet printing, which is cured by light irradiation and heating to form a product with excellent adhesion, chemical resistance, and insulating properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If existing ink compositions are used for inkjet printing, then the ink can be applied to the substrate, but the high viscosity and low solid content result in inadequate adhesion, chemical resistance, and insulating properties
Solution Approach 1:
The patent changes the chemical composition parameters of the ink by using (meth)acryloyl group-containing monomers with specific functional groups that can react with isocyanate groups. This chemical parameter change allows the ink to achieve both low viscosity for inkjet printing and high adhesion strength after curing, resolving the contradiction between ease of manufacture and strength.
Solution Approach 2:
The patent creates a composite curing system that combines photocurable (meth)acryloyl groups with thermally curable isocyanate groups. This composite material approach allows the ink to exhibit both inkjet-friendly flow properties and enhanced mechanical adhesion properties after dual-curing, simultaneously addressing viscosity and strength requirements.
2Reliability
If existing ink compositions are used for inkjet printing, then the ink can be applied to the substrate, but the low solid content results in inadequate chemical resistance and insulating properties
Solution Approach 1:
The patent changes the solid content parameter by incorporating high-solids (meth)acryloyl group-containing monomers and isocyanate compounds. These materials provide both the necessary flow characteristics for inkjet printing and sufficient solid content to ensure chemical resistance and insulating properties after curing.
Solution Approach 2:
The dual-curable composite system allows for higher solid content formulation because the (meth)acryloyl groups provide rapid photocuring that locks in the structure, while the isocyanate groups provide subsequent thermal curing for enhanced chemical resistance. This composite approach enables high solid content without compromising inkjet printability.
3Manufacturing precision
If existing ink compositions are used for inkjet printing, then the ink can be applied to the substrate, but solvent volatilization during curing results in difficulty achieving desired film thickness
Solution Approach 1:
The patent changes the formulation by using low-solvent or solvent-free (meth)acryloyl group-containing monomers and isocyanate compounds. This parameter change reduces solvent content to minimize volatilization losses and maintains consistent film thickness during the curing process, achieving both manufacturing precision and reducing substance loss.
Solution Approach 2:
The patent minimizes solvent usage in the formulation, thereby reducing the amount of substance that needs to be recovered or managed as waste. By using high-solids or solvent-free monomer systems, the ink achieves desired film thickness without significant solvent volatilization, reducing both loss of substance and manufacturing complexity.
4Stability of the object's composition
If existing ink compositions are used for inkjet printing, then the ink can be applied to the substrate, but high viscosity makes it difficult to achieve stable storage
Solution Approach 1:
The patent changes the viscosity parameter by selecting (meth)acryloyl group-containing monomers and isocyanate compounds with appropriate molecular weights and structures that ensure low viscosity for inkjet printing. Simultaneously, the chemical reactivity parameters are optimized so that the materials remain stable during storage but cure efficiently when activated, achieving both storage stability and ease of manufacture.
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 low viscosity suitable for inkjet printing, stable storage, and efficient curing at relatively low temperatures, resulting in printed wiring boards with enhanced physical properties and manufacturing efficiency.
Implementation Method 1
a photo-polymerization initiator, and the composition is used for in inkjet printing... cured by light irradiation
Implementation Method 2
thermally curable composition... cured by light irradiation and heating
Data Source
AI summary
A photocurable and thermally curable composition having a viscosity suitable for application to an inkjet printer is prepared. By the composition, it is made possible to directly draw a pattern on a substrate for a printed wiring board. The composition is cured at a relatively low temperature, having excellent adhesion, chemical resistance, heat resistance, and insulating properties after curing. The photocurable and thermally curable composition includes a (meth)acryloyl group-containing monomer, a block isocyanate, and a photo-polymerization initiator, wherein the composition is applicable to inkjet printing.