Optical Material Composition for Eyeglass Lens Mold Release
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Solution Overview
Problem
The production of plastic lenses for eyeglasses faces challenges with poor mold release characteristics, leading to defects such as peeling traces, which reduce yield and productivity, especially in powerful minus lenses, where existing optical materials fail to provide a balance between high refractive index and good Abbe number while maintaining adequate mold release.
Innovation Solution
A composition for optical materials comprising specific compounds, polythiol, sulfur, and a prepolymerization catalyst selected from imidazoles, phosphines, thioureas, or hindered amines, which improves mold release characteristics and reduces peeling traces by optimizing the refractive index and Abbe number.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If optical materials with high refractive index are used, then lens thickness is reduced, but mold release characteristics deteriorate and peeling traces occur
Solution Approach 1:
The patent applies parameter changes by modifying the chemical composition parameters of the optical material - specifically incorporating sulfur atoms and selenium atoms into the molecular structure. This changes the refractive index parameter to achieve high refractive index (1.7 or higher) while the patent claims this composition change also improves mold release characteristics, resolving the contradiction between optical performance and manufacturing quality
Solution Approach 2:
The patent uses composite materials by combining organic compounds with inorganic compounds containing sulfur and/or selenium atoms. This composite approach allows the material to simultaneously achieve high refractive index from the inorganic components and good mold release characteristics through the organic matrix, thus resolving the technical contradiction between optical properties and manufacturing precision
2Reliability
If polyepisulfide compounds are used to achieve high refractive index and high Abbe number, then optical properties are improved, but mold release characteristics become poor and peeling traces are left
Solution Approach 1:
The patent transitions from using pure polyepisulfide compounds to composite materials that include inorganic compounds with sulfur and/or selenium atoms. This composite formulation maintains the high refractive index and high Abbe number optical properties while the patent claims improved mold release characteristics that eliminate peeling traces
Solution Approach 2:
The patent changes the chemical composition parameters by introducing inorganic sulfur and selenium compounds into the optical material system. This parameter modification allows achieving the desired optical properties (high refractive index and high Abbe number) while simultaneously improving mold release characteristics to prevent peeling traces
3Reliability
If deaeration is performed under specific conditions to improve transparency and heat resistance, then optical quality is improved, but productivity is reduced due to poor mold release characteristics
Solution Approach 1:
The patent changes the fundamental material composition parameters by incorporating inorganic sulfur and selenium compounds, which the patent claims provides inherent improvement in mold release characteristics. This eliminates the need for extensive deaeration processes, thereby maintaining optical quality (transparency and heat resistance) while improving productivity by reducing processing time and eliminating defects
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 proposed composition effectively enhances mold release characteristics and suppresses peeling traces in powerful minus lenses, achieving a balance between high refractive index and Abbe number, thereby improving productivity and optical material quality.
Implementation Method 1
a prepolymerization catalyst selected from imidazoles, phosphines, thioureas, or hindered amines
Data Source
AI summary
Through an optical material composition containing a compound (a), a compound (b), a polythiol (c) and sulfur (d) according to the present invention, good mold release properties are obtained, and the occurrence of separation mark defects can be suppressed. Compound (a): a compound having the structure represented by formula (1): (In formula (1), m is an integer of 0 to 4 and n is an integer of 0 to 2.) Compound (b): a compound having the structure represented by formula (2): (In formula (2), m is an integer of 0 to 4 and n is an integer of 0 to 2.)