UV-Curable Organopolysiloxane Composition for Flexible Insulating Layers
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Solution Overview
Problem
Current UV curable organopolysiloxane compositions have high hardness and are not suitable for applications requiring flexibility, particularly in touch panels and flexible display devices, where a material with low viscosity and high elongation properties is needed for effective insulating layers.
Innovation Solution
A UV curable composition comprising organopolysiloxanes with three or more silicon atoms and two or more UV curable functional groups, combined with organosilicon compounds having one UV curable functional group, which results in a low viscosity and high elongation product, suitable for flexible applications, and can be cured using UV irradiation or electron beam methods.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a high ratio of disiloxane compound with two or more UV curable functional groups is used in the composition, then the UV curability and crosslinking density are improved, but the hardness of the cured product increases and flexibility is reduced
Solution Approach 1:
The patent changes the compositional parameters by controlling the ratio of disiloxane compound (with two or more UV curable functional groups) to be 5 mass% or less, and organopolysiloxane (with three or more silicon atoms) to be 95 mass% or more. This parameter adjustment reduces the crosslinking density to achieve flexibility while maintaining adequate UV curability through the specific functional group content (0.01 to 0.5 mmol/g).
Solution Approach 2:
The patent creates a composite material system combining disiloxane compound (for UV curability) with organopolysiloxane (for flexibility and low viscosity). This composite approach allows the cured product to achieve both UV curability and flexibility by leveraging the complementary properties of each component in a controlled ratio.
2Adaptability or versatility
If the composition is designed for high flexibility and low viscosity, then the applicability to flexible display devices is improved, but the hardness and structural stability of the cured product may be reduced
Solution Approach 1:
The patent optimizes multiple parameters simultaneously: viscosity is controlled to be 50 mPa·s or less for good applicability, while the functional group content (0.01 to 0.5 mmol/g) and organopolysiloxane content (95 mass% or more) are adjusted to achieve flexibility (elongation 10% or more) while maintaining adequate hardness through controlled crosslinking.
Solution Approach 2:
The patent applies local quality by having different regions of the molecular structure serve different functions: the organopolysiloxane backbone provides flexibility and low viscosity, while the UV curable functional groups (localized at specific positions) provide crosslinking points for structural stability. This spatial distribution of properties allows simultaneous achievement of flexibility and hardness.
3Ease of operation
If the viscosity of the composition is reduced for better application properties, then the workability and inkjet printing suitability are improved, but the molecular structure complexity may be increased
Solution Approach 1:
The patent simplifies the molecular structure by using organopolysiloxane with three or more silicon atoms and limiting the functional group content to 0.01 to 0.5 mmol/g, which naturally reduces viscosity to 50 mPa·s or less. This parameter control achieves good workability and inkjet printing suitability without requiring complex molecular structures or additional additives.
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 flexibility and workability, enabling its use as a high-performance insulating material for electronic and electrical devices, particularly in touch panels and flexible displays, with improved tensile elongation and application properties.
Implementation Method 1
UV curable composition curable by chemical rays (actinic rays), for example ultraviolet rays
Implementation Method 2
the curing method is not limited to UV irradiation, and an arbitrary method in which a UV curable functional group can cause a curing reaction can be used. For example, electron beam irradiation may be used to cure the composition of the present invention
Data Source
AI summary
Provided is a UV curable composition containing a silicon atom, wherein a product obtained by curing the composition has excellent flexibility and excellent workability when applied to a substrate. The UV curable composition of the present disclosure comprises: (A) one or more organopolysiloxane with three or more silicon atoms and having, on average, two or more UV curable functional groups in a molecule; and (B) one or more organosilicon compound having one UV curable functional group in a molecule. The composition is substantially free or an organic solvent. In addition, the viscosity of the entire composition measured at 25° C. using an E-type viscometer is 80 mPa·s or less.