White Curable Composition for PCB Reflectance
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Solution Overview
Problem
Conventional white compositions for printed circuit boards require extensive dispersion treatment and multiple steps for high reflectance, making them difficult to coat repeatedly and prone to nozzle clogging during ink-jet printing.
Innovation Solution
A white curable composition comprising a (meth)acrylate compound with a hydroxyl group, a photopolymerization initiator, and a wetting dispersant, along with a white pigment like titanium oxide, which allows for good dispersion and adhesion without extended treatment, enabling simultaneous printing and pre-curing, thus reducing steps and viscosity for easy layering.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If a large amount of white pigment is used to achieve high reflectance, then the reflectance is improved, but the dispersion treatment time and complexity increase
Solution Approach 1:
A wetting dispersant is introduced as an intermediary substance to facilitate the dispersion of white pigment particles. The wetting dispersant reduces surface tension and prevents pigment aggregation, enabling efficient dispersion without extended treatment time while maintaining high reflectance properties
Solution Approach 2:
The viscosity of the curable composition is reduced to a specific range (10-100 cP) to improve flow characteristics and dispersion efficiency. This parameter change allows the pigment to disperse more uniformly and quickly while maintaining the desired reflectance level
2Illumination intensity
If high-viscosity composition is coated to achieve high reflectance, then the reflectance is improved, but the number of coating steps and process complexity increase
Solution Approach 1:
The coating and pre-curing operations are merged into a single step by using a composition with optimized viscosity that can be directly coated and immediately cured without separate drying or pre-curing steps. This eliminates multiple processing steps while achieving the desired reflectance
Solution Approach 2:
The viscosity is adjusted to an optimal range (10-100 cP) that enables single-step coating followed by immediate curing. This parameter optimization allows the composition to be applied in a single pass and cured without additional pre-curing steps, reducing process complexity while maintaining high reflectance
3Stability of the object's composition
If extended dispersion treatment is performed to achieve good dispersion, then the dispersion quality is improved, but the production time and productivity decrease
Solution Approach 1:
The wetting dispersant acts as a mediator that accelerates the dispersion process by reducing interfacial tension between pigment particles and the curable composition matrix. This intermediary substance enables rapid and uniform dispersion without requiring extended treatment time, maintaining dispersion quality while improving productivity
Solution Approach 2:
The viscosity is reduced to a specific range (10-100 cP) to enhance the mobility of pigment particles during dispersion. This parameter change facilitates faster and more uniform dispersion without requiring extended treatment time, thereby improving production efficiency while maintaining dispersion quality
4Illumination intensity
If multiple coating steps are performed to achieve high reflectance, then the reflectance is improved, but the ease of operation and process simplicity decrease
Solution Approach 1:
Multiple operations (coating and pre-curing) are merged into a single step by using a composition that can be directly cured after coating without intermediate drying or pre-curing steps. This merging simplifies the operation sequence while achieving the desired reflectance level
Solution Approach 2:
The viscosity is optimized to (10-100 cP) to enable direct coating followed by immediate curing in a simplified process sequence. This parameter optimization eliminates the need for multiple separate steps, making the operation simpler while maintaining high reflectance
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 highly reflective, adhesive, and heat-resistant cured coating film with improved filtration efficiency and compatibility, suitable for ink-jet methods, without the need for complex pre-curing steps, enhancing the coating process and product properties.
Implementation Method 1
a photopolymerization initiator; (C) a photopolymerization initiator
Implementation Method 2
a wetting dispersant
Data Source
AI summary
An object of the present invention is to obtain a white curable composition that can yield a highly reflective cured coating film without requiring a complicated step and show good dispersion even without being subjected to an extended dispersion treatment. Provided is a white curable composition for a printed circuit board comprising: (A) a white pigment; (B) a (meth)acrylate compound having a hydroxyl group; (C) a photopolymerization initiator; and (D) a wetting dispersant. The above-described (A) white pigment is preferably titanium oxide. Further, it is also preferred that the above-described titanium oxide be a rutile-type titanium oxide and have a maximum particle size of 1 μm or smaller.