Solvent-Free Adhesive for Acrylic Refractive Index Control
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Solution Overview
Problem
Solvent-based refractive index control materials for optical adhesives suffer from compatibility issues with acrylic materials, leading to high viscosity and poor practicality, and surface deterioration during adhesion.
Innovation Solution
A solvent-free light-curable adhesive composition containing a triazine ring-containing polymer with a controlled molecular weight range of 500 to 7,000 and a reactive diluent, which improves compatibility with acrylic materials and refractive index control.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a solvent-based refractive index control material containing a triazine ring-containing polymer is used, then the refractive index control is improved, but the compatibility with acrylic adhesive materials deteriorates, resulting in high viscosity
Solution Approach 1:
The patent removes the solvent component from the refractive index control material, extracting only the essential triazine ring-containing polymer and reactive diluent. This extraction eliminates the solvent-related compatibility issues with acrylic materials while preserving the refractive index control function, directly resolving the technical contradiction between refractive index control and material compatibility.
Solution Approach 2:
The patent changes the molecular weight parameter of the triazine ring-containing polymer to a specific range (500-10,000) and adjusts the compositional parameters ( ratios of triazine ring-containing polymer, reactive diluent, and acrylic material). These parameter changes optimize both the refractive index control and compatibility with acrylic materials, resolving the contradiction by finding optimal parameter values that satisfy both requirements.
2Manufacturing precision
If a solvent-based refractive index control material is used, then the refractive index control is improved, but the surface deterioration of adhered members occurs during adhesion
Solution Approach 1:
The patent extracts and removes the solvent component from the refractive index control material, eliminating the source of surface deterioration. By using only the triazine ring-containing polymer and reactive diluent without solvent, the material maintains its refractive index control function while preventing solvent-induced surface deterioration of adhered members during adhesion.
Solution Approach 2:
The patent converts the potential harm of solvent-based materials (surface deterioration) into a benefit by developing a solvent-free formulation. The removal of solvent, which was previously causing surface deterioration, transforms the material into a safer option that maintains refractive index control without harmful surface effects, turning the limitation into an advantage.
3Ease of manufacture
If a solvent-free composition containing a triazine ring-containing polymer is used, then the compatibility with acrylic material is improved, but the viscosity remains high and practical use is limited
Solution Approach 1:
The patent introduces a reactive diluent as an intermediary substance between the triazine ring-containing polymer and the acrylic material. This reactive diluent acts as a mediator that reduces the viscosity of the solvent-free composition, making it easier to handle and apply, while maintaining the compatibility benefits of the solvent-free formulation.
Solution Approach 2:
The patent adjusts the molecular weight parameter of the triazine ring-containing polymer (500-10,000) and optimizes the compositional parameters (ratios of components). These parameter changes enable the solvent-free composition to achieve both good compatibility with acrylic materials and reduced viscosity for practical application, resolving the contradiction between compatibility and ease of operation.
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 compatibility and refractive index control, enhancing visibility and light extraction efficiency in optical devices by forming a transparent adhesive layer with reduced refractive index differences.
Implementation Method 1
a solvent-free light-curable adhesive additive composition including: a triazine ring-containing polymer having a weight average molecular weight of 500 to 7,000 and a recurring unit structure of formula (1) below, and a reactive diluent of formula (A) below
Implementation Method 2
these acrylic materials have high transparency, but differences arise between their refractive indices and those of the associated surfaces of the individual members, resulting in a problem that light is reflected at the interfaces and the light extraction efficiency is hence lowered
Implementation Method 3
a solvent-free light-curable adhesive additive composition
Data Source
AI summary
A solvent-free light-curable adhesive composition includes: for example, a triazine ring-containing polymer including a repeating unit structure represented by formula [3] and having a weight-average molecular weight of 500-5000; and a reactive diluent such as N-vinylformamide, the composition not including a solvent. The solvent-free light-curable adhesive composition has good compatibility with acrylic materials and the like, which are adhesive components, even without including a solvent.