µ-Polyoxo Crosslinked Molybdenum Phthalocyanine for NIR Absorption
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Solution Overview
Problem
Phthalocyanine compounds used in optical recording media face issues with sensitivity, solubility, recording performance, and the difficulty in distinguishing near-infrared absorption from color pigment absorption, leading to limitations in achieving various colors and potential forgery.
Innovation Solution
A µ-polyoxo crosslinked molybdenum phthalocyanine compound with specific structural features that absorb near-infrared rays at 800-950 nm and reflect at 1200 nm or more, along with a method for preparing this compound and incorporating it into a near-infrared absorbing and reflecting composition.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional phthalocyanine compounds are used in optical recording media, then near-infrared absorption is achieved, but absorption spectrum overlap with color pigments occurs making it difficult to distinguish and achieve various colors
Solution Approach 1:
The invention segments the near-infrared absorption function from the color pigment function by using a dual-layer structure: a recording layer containing phthalocyanine compound for near-infrared absorption and a separate color layer containing color pigments. This segmentation eliminates spectral overlap and enables both functions to operate independently, achieving clear spectral distinction and various colors simultaneously
Solution Approach 2:
The invention adds a vertical dimension by creating a multi-layered structure where the phthalocyanine compound layer and color pigment layer are positioned at different depths. This dimensional separation allows the near-infrared absorption and color display functions to coexist without interference, enabling both spectral precision and color versatility
2Reliability
If single metal phthalocyanine compounds or oxo crosslinked compounds are used, then near-infrared absorption at 800 nm or less is achieved, but light fastness, thermal stability, dispersibility, chemical resistance, and solvent resistance are weak
Solution Approach 1:
The invention uses a composite material system where a metal phthalocyanine compound (providing near-infrared absorption) is combined with an oxo crosslinked polymer matrix (providing enhanced stability). The crosslinked network structure of the polymer reinforces the metal phthalocyanine compound, simultaneously improving light fastness, thermal stability, dispersibility, chemical resistance, and solvent resistance while maintaining near-infrared absorption capability
Solution Approach 2:
The oxo crosslinked polymer acts as an intermediary medium that binds and stabilizes the metal phthalocyanine compound. This polymer matrix serves as a protective environment that enhances the stability properties of the phthalocyanine compound without interfering with its near-infrared absorption function
3Adaptability or versatility
If carbon black or graphite is used for near-infrared absorption, then high absorption is achieved, but only dark or black color is provided making it difficult to exhibit various colors
Solution Approach 1:
The invention segments the near-infrared absorption function from the color display function by placing carbon black or graphite exclusively in the recording layer dedicated to near-infrared absorption, while the color layer contains only color pigments. This segmentation allows efficient near-infrared absorption by carbon materials without compromising color variety, as the color pigments in the separate layer are not obscured
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 µ-polyoxo crosslinked molybdenum phthalocyanine compound achieves high absorption and reflection properties, enabling stable performance across a wide wavelength range, improving light fastness and thermal stability, and allowing for the creation of various colors without absorption spectrum overlap, thus enhancing security and application versatility.
Implementation Method 1
having high absorption at a wavelength of 800 to 950 nm
Implementation Method 2
having high reflectance at a wavelength of 1200 nm or more
Data Source
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AI summary
Disclosed herein are a µ-polyoxo crosslinked phthalocyanine compound, a preparing method thereof, and a near infrared ray absorbing and reflecting composition using the same, and more particularly, a µ-polyoxo crosslinked phthalocyanine compound having high absorption at a wavelength of 800 to 950nm and high reflectance at a wavelength of 1200nm or more, a preparing method of a µ-polyoxy crosslinked phthalocyanine compound simultaneously having near infrared ray absorption and reflection properties as described above, and a near infrared ray absorbing and reflecting composition using the µ-polyoxo crosslinked phthalocyanine compound. According to the exemplary embodiment of the present invention, there is provided a µ-polyoxo crosslinked molybdenum phthalocyanine compound capable of absorbing and reflecting near infrared ray at the same time.