Photochromic Optical Material Composition to Prevent Compound Aggregation
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Solution Overview
Problem
Existing photochromic compounds used in optical materials tend to aggregate, leading to reduced photochromic performance and durability in cured bodies.
Innovation Solution
A novel compound for optical materials represented by Formula (Ia) is introduced, featuring specific organic residues, flexible polymer chains, and functional groups that enhance dispersibility and prevent aggregation, incorporated into a curable composition with polyisocyanate or polyisothiocyanate compounds to form a cured body with improved photochromic properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional photochromic compounds are used in curable compositions, then photochromic properties are provided, but the compounds tend to aggregate leading to reduced photochromic performance and durability
Solution Approach 1:
The patent introduces a specific compound (Formula Ia) as an intermediary substance that mediates between the photochromic compound and the cured body matrix. This compound contains a polymer group (R3) that acts as a spacer or barrier, preventing direct aggregation of photochromic compounds while maintaining their photochromic properties. The compound serves as a bridge that disperses photochromic compounds uniformly throughout the cured body, improving both photochromic performance and durability by eliminating aggregation issues.
Solution Approach 2:
The patent creates a composite material system where the compound of Formula (Ia) combines multiple functional groups: a polymer group (R3) for dispersibility and aggregation prevention, organic residues (R1) for structural integrity, and functional groups (X1, X2, R2, R4) for photochromic activity. This composite structure integrates the benefits of polymer stabilization with photochromic functionality, resulting in a material that maintains both structural stability and enhanced photochromic performance without aggregation.
2Reliability
If photochromic compound dispersibility is improved by preventing aggregation, then photochromic performance increases, but the complexity of the curable composition increases
Solution Approach 1:
The compound of Formula (Ia) is designed with multi-functionality to reduce overall composition complexity. The polymer group (R3) simultaneously provides dispersibility, prevents aggregation, and contributes to the mechanical properties of the cured body. The organic residues (R1) and functional groups (X1, X2, R2, R4) are configured to provide both structural stability and photochromic activity within a single molecular framework. This multi-functional design eliminates the need for separate additives for each function, simplifying the overall curable composition while achieving superior photochromic performance.
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 novel compound enhances the photochromic performance and durability of the cured body by maintaining flexibility and reducing aggregation, resulting in optimal absorption wavelength, color density, and fading half-life characteristics.
Implementation Method 1
photochromic glasses imparted with photochromic properties... lenses that change their transmittance depending on the surrounding brightness (amount of ultraviolet light)
Implementation Method 2
Such a photochromic lens is obtained, for example, by curing a polymerizable composition containing a photochromic compound
Data Source
AI summary
The present invention provides a novel compound for optical materials, and a curable composition, a cured body and an optical article containing the compound for optical materials. According to an embodiment, there is provided a compound for optical materials represented by Formula (Ia) below:In Formula (Ia), X1 and X2 are each NH, S, or O. R1 is a 1- to 30-valent organic residue. R3 is a group composed of a polymer having a repeating unit selected from the group consisting of —(CH2)mO—, —(CH2CH2O)—, —(CH(CH3)CH2O)—, —(CH2CH(CH3)O)—, —(C(═O)—CH2CH2CH2CH2CH2O)—, —(C(═O)—O—CH2CH2CH2CH2CH2O)—, and (C(═O)—O—CH2CH2CH2CH2CH2CH2O)—, a random copolymer having at least two repeating units selected from the group, or a block copolymer having at least two repeating units selected from the group.