Near-Infrared Fluorescent Resin Composition With Phase-Separated Dispersion
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Solution Overview
Problem
Existing resin compositions containing near-infrared fluorescent pigments face challenges such as low emission intensity, poor compatibility with resins, difficulty in dispersion, and high production costs, making it difficult to produce molded objects with high light-emitting efficiency.
Innovation Solution
A resin composition comprising a near-infrared fluorescent material, a thermoplastic resin, and a different resin forming a continuous phase, with the fluorescent material and thermoplastic resin forming a dispersed phase, allowing for easy production and high light-emitting efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If inorganic near-infrared fluorescent pigments are used, then emission wavelength can be easily adjusted, but rare earth elements and nanoparticles with uniform particle size are required, increasing production cost
Solution Approach 1:
The patent replaces expensive inorganic fluorescent pigments containing rare earth elements with organic fluorescent pigments that can be synthesized more economically. The organic pigments achieve comparable near-infrared emission properties without requiring rare earth resources, thereby reducing production costs while maintaining wavelength adjustability through molecular design
Solution Approach 2:
The patent adjusts the emission wavelength by modifying the molecular structure of organic fluorescent pigments through chemical synthesis. By changing parameters such as conjugated system length, substituent groups, and molecular planarity, the emission wavelength can be tuned across the near-infrared region without requiring rare earth elements or complex nanoparticle synthesis
2Ease of manufacture
If organic near-infrared fluorescent pigments are used, then synthesis is easier and wavelength can be adjusted, but stability in resin mixing is poor
Solution Approach 1:
The patent introduces a resin-compatible organic fluorescent pigment as an intermediary that bridges the gap between easy-to-synthesize organic dyes and resin stability requirements. The pigment is specifically designed with molecular structures that ensure compatibility with common resins used in medical devices, maintaining both ease of synthesis and stability in the final product
Solution Approach 2:
The patent develops a composite fluorescent pigment system that combines organic chromophores with stabilizing molecular structures. This composite approach maintains the ease of organic synthesis while incorporating features that enhance stability during resin mixing and processing, solving the contradiction between synthesis ease and compositional stability
3Measurement precision
If near-infrared fluorescent pigment is incorporated into medical implant, then visibility and identification are improved, but emission intensity is insufficient
Solution Approach 1:
The patent optimizes the molecular structure of organic fluorescent pigments to enhance their emission quantum yield and absorption coefficients. By adjusting parameters such as molecular planarity, conjugation length, and substituent electron-donating/withdrawing groups, the pigments achieve higher emission intensity in the near-infrared region, improving visibility without compromising the medical implant's function
Solution Approach 2:
The patent adopts successful molecular design strategies from high-performance fluorescent dyes used in other applications and adapts them for near-infrared medical imaging. By copying and modifying proven fluorescent structures, the patent achieves high emission intensity while maintaining biocompatibility and resin compatibility
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 resin composition achieves high light-emitting efficiency and easy production of molded objects, with the fluorescent material and thermoplastic resin forming a dispersed phase in a continuous phase, enhancing visibility and safety for medical tools.
Implementation Method 1
Near-infrared fluorescent pigments are used in industrial products mainly for identification and forgery prevention of various products, and in recent years, they are also used in medical applications such as probes for biological imaging and testing agents. As characteristics of the near-infrared wavelength region, it is known that the near-infrared wavelength region cannot be visually observed with the naked eye of a human being, has little influence on a living body, and has high permeability to a living body such as skin.
Implementation Method 2
the near-infrared fluorescent pigment itself incorporated into the medical implant needs to strongly absorb light in the near-infrared region, and in addition, needs to emit strong fluorescence
Data Source
AI summary
The present invention provides a resin composition which emits near-infrared fluorescence, has high light-emitting efficiency, and can be relatively easily produced, and a molded object obtained from the resin composition. More specifically, the present invention provides a resin composition containing a near-infrared fluorescent material (A), a thermoplastic resin (B) other than a polyamide resin, and a resin (C) different from the thermoplastic resin (B), in which the resin (C) forms a continuous phase, and a dispersed phase containing the near-infrared fluorescent material (A) and the thermoplastic resin (B) is formed in the continuous phase.