UV-Curable Organopolysiloxane Coating for Low-Dielectric Inkjet Printing
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Solution Overview
Problem
Existing UV-curable compositions for electronic and electrical devices lack materials with low dielectric constants and excellent workability, particularly low viscosity, for coating to base materials, and there is a need for improved insulating materials with high flexibility and reliability in thin display devices.
Innovation Solution
A UV-curable composition containing organopolysiloxane with both UV-curable and non-UV-curable monofunctional polycyclic functional groups, which may contain hetero atoms, and is substantially free of organic solvents, achieving low viscosity and low dielectric constants in the cured product.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional UV-curable compositions are used, then curing performance is achieved, but the dielectric constant is high and viscosity is not sufficiently low for excellent coating workability
Solution Approach 1:
The patent uses a composite material system comprising organopolysiloxane with specific molecular weight (500-5000), silane crosslinking agent, and photopolymerization initiator. The organopolysiloxane backbone provides low dielectric constant while the controlled molecular weight and crosslinking density optimize both dielectric properties and coating viscosity for excellent workability
Solution Approach 2:
The patent optimizes the molecular weight of organopolysiloxane within 500-5000 range and controls the ratio of hydrophilic to hydrophobic groups to achieve the desired balance between low dielectric constant and appropriate viscosity. By adjusting these parameters, the composition achieves both excellent coating workability and low dielectric constant in cured product
2Ease of operation
If UV-curable composition with low viscosity is developed, then coating workability improves, but dielectric constant may increase
Solution Approach 1:
The patent optimizes molecular weight within 500-5000 range to achieve appropriate viscosity for excellent coating workability while controlling dielectric constant. By precisely adjusting this parameter, the patent achieves the desired balance between workability and dielectric properties
Solution Approach 2:
The patent introduces silane crosslinking agents that create localized crosslinked structures within the polymer matrix. This local crosslinking enhances the network density in specific regions, reducing overall dielectric constant while maintaining low bulk viscosity for good coating workability
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 provides a cured product with a dielectric constant of 3.0 or less and excellent workability, suitable for insulating layers in electronic devices, particularly in flexible displays, with improved reliability and flexibility.
Implementation Method 1
UV-curable composition containing an organosilicon compound, and preferably an organosilane and/or an organopolysiloxane... which can be cured by actinic rays, such as ultraviolet rays
Data Source
AI summary
Provided is a UV-curable composition which, when cured, produces a product having a low dielectric constant and excellent workability when coated onto a base material, and which has a viscosity particularly suitable for coating by inkjet printing; and an organopolysiloxane serving as a main agent of the composition. The UV-curable composition comprises one or more organopolysiloxane (A) having, in each molecule, a UV-curable functional group, and a non-UV-curable monofunctional polycyclic functional group which may contain a hetero atom. The UV-curable composition is useful as an insulative coating agent.