Optical Thermoplastic Resin Composition for Refractive Index and Abbe Number
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Solution Overview
Problem
Conventional thermoplastic resins, such as polysiloxane polymers, lack optimal properties for optical applications, particularly in terms of refractive index and Abbe number, which are crucial for minimizing chromatic aberration.
Innovation Solution
A thermoplastic resin comprising a silane constituent unit derived from silane compounds, an ester constituent unit derived from dicarboxylic acid or its esters, and a diol constituent unit derived from dihydroxy compounds, specifically dinaphthalene and fluorene units, with controlled molecular ratios and polymerization processes to enhance refractive index and Abbe number.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If conventional polysiloxane polymers are used as thermoplastic resins, then the material provides basic thermoplastic properties, but the refractive index and Abbe number cannot be simultaneously optimized for optical applications
Solution Approach 1:
The patent creates a composite thermoplastic resin system by combining polysiloxane polymer chains with pendant ester groups and diol-derived aromatic rings (naphthalene and fluorene units). This composite structure integrates the thermoplastic processability of polysiloxane with the high refractive index and Abbe number characteristics of aromatic ester-diol units, resolving the contradiction between ease of manufacture and optical precision.
Solution Approach 2:
The invention introduces locally concentrated aromatic ester-diol units (naphthalene and fluorene rings) as pendant groups within the polysiloxane polymer chain. These localized aromatic structures provide high refractive index and Abbe number properties at specific positions, while the bulk polysiloxane matrix maintains thermoplastic processability, thus achieving both ease of manufacture and optical precision.
2Illumination intensity
If thermoplastic resins with high refractive index are used, then optical focusing properties improve, but the Abbe number decreases causing chromatic aberration
Solution Approach 1:
The patent systematically varies the molecular structure parameters of the ester-diol units by selecting different aromatic rings (naphthalene with 10 carbons and fluorene with 13 carbons) and adjusting their ratios. This parameter optimization allows simultaneous achievement of high refractive index (through aromatic ring density) and high Abbe number (through specific ring structure selection), resolving the inverse relationship between these optical properties.
Solution Approach 2:
The invention employs specific aromatic ring structures (naphthalene and fluorene) with distinct local electronic and optical characteristics. By strategically placing these different aromatic units at specific positions within the polymer chain and controlling their ratio, the material achieves locally optimized optical properties that collectively provide both high refractive index and high Abbe number, overcoming the general trade-off.
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 resulting thermoplastic resin achieves high refractive index and Abbe number, suitable for optical applications, enabling the production of high-quality optical lenses.
Implementation Method 1
A thermoplastic resin comprising: a silane constituent unit (S), which is a constituent unit derived from at least any silane compound... an ester constituent unit (I) derived from a dicarboxylic acid, monocarboxylic acid monoester, or carboxylic acid diester... and a diol constituent unit (A)
Data Source
AI summary
Provided is: a thermoplastic resin having excellent properties for optical applications and the like, including, for example, properties such as refractive index and chromatic aberration; and a molded article and the like containing such a thermoplastic resin. As a means for solving the above problem, the present invention provides a thermoplastic resin comprising: a silane constituent unit (S) having a prescribed structure; an ester constituent unit (I) represented by formula (I); and a diol constituent unit (A). (R1 and R2 in general formula (1) and R1, R2, Ri, Rii, a, b, m, and n in formula (1) are each as described in the specification)