Polythiourethane Molded Product SH Group Concentration
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Solution Overview
Problem
Existing methods for producing molded products with excellent impact resistance and dyeability are limited by the specific combination of monomers used, and there is a need for a method that achieves these characteristics regardless of the monomer combination.
Innovation Solution
A molded product with a specific range of SH group concentration (0.30 wt % to 3.0 wt %) is developed, using a polymerizable composition comprising a polyisocyanate compound and a polythiol compound, which results in excellent impact resistance and dyeability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If specific compounds are combined to achieve excellent impact resistance and dyeability, then these characteristics are improved, but the method is limited by specific monomer combinations and lacks universality
Solution Approach 1:
The invention changes the parameter of SH group concentration to a specific range (0.05-5.0 wt%) to achieve excellent impact resistance and dyeability. This parameter-based approach allows universality across different monomer combinations while maintaining reliable performance, resolving the contradiction between reliability and adaptability.
2Weight of moving object
If polythiourethane is used as a material for plastic lenses, then light weight and high refractive index are achieved, but control over impact resistance and dyeability becomes difficult
Solution Approach 1:
The invention introduces SH group concentration (0.05-5.0 wt%) as a controlling parameter to achieve excellent impact resistance in polythiourethane-based plastic lenses. This allows maintaining the light weight advantage while gaining reliable impact resistance through parameter optimization rather than being constrained by material selection alone.
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 molded product achieves excellent releasability, impact resistance, and dyeability, making it suitable for use in optical materials and plastic lenses.
Implementation Method 1
a molded product including a polythiourethane, in which an SH group concentration according to an IR analysis method is 0.30 wt % to 3.0 wt %
Implementation Method 2
an SH group concentration according to an IR analysis method
Data Source
AI summary
A molded product of the present invention includes a polythiourethane, in which an SH group concentration according to an IR analysis method is 0.30 wt % to 3.0 wt %.