Transparent Adhesive Sheet Composition for Active-Energy Curing
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Solution Overview
Problem
Existing adhesive sheets for flexible image display devices have insufficient sensitivity to active energy rays, making high-efficiency curing difficult.
Innovation Solution
A transparent adhesive sheet composed of an adhesive agent containing (meth)acrylic polymer, a radically polymerizable compound with a carbon-carbon double bond, and a photopolymerization initiator, with specific storage shear modulus and ratio characteristics, enhancing sensitivity to active energy rays for efficient curing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional adhesive sheets are used, then the adhesive layer can be formed, but the sensitivity to active energy rays is insufficient and curing efficiency is low
Solution Approach 1:
The patent changes the chemical composition parameters of the adhesive layer by incorporating specific photopolymerization initiators (compound A with absorption maximum 200-400nm, compound B with absorption maximum 250-350nm) and radicals (compound C). This parameter change enables the adhesive to absorb active energy rays more effectively and undergo rapid photopolymerization, thereby improving both sensitivity and curing efficiency simultaneously
Solution Approach 2:
The patent creates a composite adhesive material combining multiple components: (meth)acrylic polymer as the base, photopolymerization initiators (compounds A and B), and radical-generating compounds (compound C). This composite formulation synergistically enhances the light absorption capability and initiates efficient crosslinking reactions, resolving the contradiction between sensitivity and curing efficiency
2Adaptability or versatility
If the adhesive sheet has high flexibility, then it can be used in flexible display devices, but the storage shear modulus at low temperature may be too low
Solution Approach 1:
The patent adjusts the composition parameters of the adhesive layer, specifically controlling the ratio of (meth)acrylic polymer to photopolymerization initiators and radicals. This parameter optimization ensures the adhesive maintains appropriate flexibility for flexible display devices while achieving sufficient storage shear modulus (10-1000 kPa at -20°C) for stable bonding, resolving the contradiction between flexibility and structural stability
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 adhesive sheet achieves high sensitivity and efficient curing, improving the performance of laminates and flexible image display devices by ensuring effective bonding and durability.
Implementation Method 1
the adhesive agent composition (I) contains a precursor containing (meth)acrylic polymer (A), a compound (B) having, in a molecule, a radically polymerizable functional group having a carbon-carbon double bond, and a structure which generates a radical, and a photopolymerization initiator (C)
Data Source
AI summary
The disclosure relates to a transparent adhesive sheet formed of an adhesive agent composition (I), in which the adhesive agent composition (I) contains a precursor containing a (meth)acrylic polymer (A), a compound (B) having, in a molecule, a radically polymerizable functional group having a carbon-carbon double bond, and a structure which generates a radical, and a photopolymerization initiator (C) consisting of a compound other than compound (B), and a storage shear modulus (G′(−20° C.)) at −20° C. obtained by a dynamic viscoelasticity measurement in a shear mode at a frequency of 1 Hz, is 10 kPa or more and 1,000 kPa or less.