Solvent-Free UV-Curable Siloxane Composition for Viscosity Control
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Solution Overview
Problem
Existing UV-curable compositions containing organopolysiloxanes lack sufficient viscosity adjustability and workability, particularly for applications in inkjet printing and insulating layers of flexible display devices, where high flexibility and mechanical properties are required.
Innovation Solution
A UV-curable composition comprising 1 to 99 parts by mass of a compound with (meth)acryloxy groups and 99 to 1 part by mass of an organopolysiloxane with alkenyl and aromatic hydrocarbon groups, free of organic solvents, allowing for easy adjustment of viscosity and mechanical properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If conventional UV-curable compositions containing organopolysiloxanes are used, then UV curability is achieved, but viscosity adjustability and workability are insufficient
Solution Approach 1:
The patent applies parameter changes by systematically varying the molecular weight, functional group type, and compositional ratios of organopolysiloxane components to achieve precise control over viscosity and mechanical properties. Specifically, the patent uses organopolysiloxanes with different numbers of alkenyl groups (1-3 groups) and different aromatic hydrocarbon group contents (6-20 carbon atoms) to adjust composition viscosity while maintaining UV curability and achieving desired cured product mechanical properties.
2Strength
If high mechanical properties are achieved in cured products, then strength and reliability improve, but flexibility and coatability deteriorate
Solution Approach 1:
The patent employs composite materials by combining multiple organopolysiloxane components with different functional characteristics. The composition includes organopolysiloxanes with alkenyl groups for crosslinking, aromatic hydrocarbon groups for mechanical strength, and carefully selected ratios of these components to achieve a balance between cured product strength and composition coatability. The composite approach allows simultaneous optimization of both pre-curing workability and post-curing mechanical properties.
3Ease of operation
If organic solvents are added to improve viscosity adjustability, then coatability improves, but environmental harm and health safety worsen
Solution Approach 1:
The patent achieves solvent-free viscosity control through parameter changes in the organopolysiloxane structure itself. By adjusting the molecular weight, the number of alkenyl groups per molecule, and the type of aromatic hydrocarbon groups, the patent modifies the intrinsic viscosity of the composition without adding organic solvents. This allows the composition to maintain suitable coatability and wettability while being environmentally friendly and safe for use.
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 excellent coatability, wettability, and mechanical properties, including high viscosity adjustability and flexibility, suitable for insulating materials and coatings without the need for organic solvents.
Implementation Method 1
UV-curable composition curable by actinic rays, such as UV rays or electron beam
Data Source
AI summary
Provided is a UV-curable composition containing a silicon atom, that has high adjustability of mechanical properties of a product obtained by curing, and excellent workability when applied to a base material, even as a solvent-free type. A UV-curable composition contains: when the total mass of the composition is 100 parts by mass, (A) 1 to 99 parts by mass of a compound having one or more (meth)acryloxy group in one molecule, and (B) 99 to 1 part by mass of an organopolysiloxane having two or more alkenyl groups and at least one aromatic hydrocarbon group with 6 to 20 carbon atoms in one molecule, and having no UV-curable functional group. The composition is substantially free of an organic solvent.