Active Ray-Curable Composition Balancing Inkjet Ejection and Film Durability
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Solution Overview
Problem
Existing curable resin compositions used in image display devices face challenges in maintaining tackiness and durability in high-temperature and high-humidity environments, low-temperature environments, and flexibility against bending, while also ensuring stable ejection in inkjet methods.
Innovation Solution
An active ray-curable composition comprising a (meth)acrylic polymer with a specific molecular weight and hydroxyl value, (meth)acrylates with and without hydroxyl groups, and a photopolymerization initiator, with controlled viscosity, is used to enhance durability and ejection stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a material having a hydroxyl group is blended into a composition to enhance durability in extreme environments and bending resistance, then the durability of the cured film is improved, but the ejection stability in an inkjet method deteriorates due to increased viscosity
Solution Approach 1:
The patent applies parameter changes by precisely controlling the molecular weight of the (meth)acrylic polymer within 10,000-150,000 and the hydroxyl value within 30-120 mgKOH/g. This optimization balances the viscosity for ejection stability while maintaining sufficient durability. The viscosity is controlled to be 10-200 mPa·s at 25°C, achieving both inkjet ejection stability and cured film durability.
Solution Approach 2:
The patent uses a composite material system comprising four components: (A) (meth)acrylic polymer with specific molecular weight and hydroxyl value, (B) (meth)acrylate with hydroxyl group, (C) (meth)acrylate without hydroxyl group, and (D) photopolymerization initiator. This composite formulation balances polarity for durability with viscosity control for ejection stability.
2Ease of operation
If the molecular weight of the polymer component is decreased to improve ejection stability, then the ejection stability is improved, but the durability and tackiness maintenance of the cured film deteriorate
Solution Approach 1:
The patent optimizes the molecular weight parameter to a specific range (10,000-150,000) rather than using low molecular weight materials. This parameter optimization ensures the polymer has sufficient chain length for durability and tackiness while maintaining acceptable viscosity for ejection. The hydroxyl value is simultaneously optimized to 30-120 mgKOH/g to balance polarity effects.
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 improves durability of cured films in extreme environments and flexibility against bending, while maintaining stable ejection properties in inkjet methods, forming high-definition patterns with precision.
Implementation Method 1
component (D): a photopolymerization initiator wherein a viscosity of the active ray-curable composition at 25° C. is 10 mPa·s or more and 200 mPa·s or less
Data Source
AI summary
The present invention provides an active ray-curable composition which is capable of increasing discharge stability based on the inkjet method while increasing the durability of the cured film in high-temperature, high-humidity environments and in low-temperature environments, and the durability of a cured film to bending. The active ray-curable composition according to the present invention contains the following components (A)-(D), and the viscosity thereof at 25° C. is 10-200mPa·s, inclusive: component (A), a (meth)acrylic polymer which has a weight-average molecular weight of 10,000-150,000, inclusive, and a hydroxyl value of 30mgKOH/g or higher; component (B), a (meth)acrylate having a hydroxyl group; component (C), a (meth)acrylate which does not have a hydroxyl group; and component (D), a photopolymerization initiator.