Low Moisture Polyrotaxane Monomer for Stable Curing
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Solution Overview
Problem
Existing polyrotaxane monomers used in urethane foams and optical materials often result in uneven foam sizes and fluctuating physical properties due to high water content, leading to reduced productivity and quality in polishing pads and lenses.
Innovation Solution
A polyrotaxane monomer with a water content of 5000 ppm or less, containing a polymerizable functional group and a specific molecular structure, is developed to stabilize the curing process and enhance mechanical properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If polyrotaxane monomer with high water content is used in curable composition, then mechanical strength and photochromic performance are improved, but physical properties of cured products fluctuate and foam size becomes uneven
Solution Approach 1:
The patent applies parameter changes by strictly controlling the water content of the polyrotaxane monomer to 5000 ppm or less. This parameter control resolves the contradiction by preventing water-related side reactions that cause foam size variation, while still allowing the polyrotaxane monomer to provide its mechanical strengthening and photochromic benefits through its molecular structure and crosslinking capability.
Solution Approach 2:
The patent implements preliminary action by pre-drying the polyrotaxane monomer to reduce water content to 5000 ppm or less before incorporating it into the curable composition. This preliminary water removal prevents subsequent foam size irregularities and physical property fluctuations during the curing process, while preserving the monomer's functional benefits.
2Strength
If polyrotaxane monomer with high water content is used in curable composition, then mechanical strength and photochromic performance are improved, but productivity is reduced due to quality fluctuations
Solution Approach 1:
The patent applies parameter changes by setting a strict water content limit of 5000 ppm or less for the polyrotaxane monomer. This parameter control eliminates quality fluctuations in cured products, thereby stabilizing production and improving productivity without sacrificing the mechanical strength and photochromic performance benefits of the polyrotaxane monomer.
Solution Approach 2:
The patent implements feedback by establishing a clear water content specification (5000 ppm or less) for the polyrotaxane monomer. This feedback mechanism ensures that only monomers meeting the quality standard are used, preventing physical property fluctuations and enabling consistent, high-productivity manufacturing of optical materials with reliable performance.
3Strength
If conventional polyrotaxane monomer is used in polishing pad material, then wear resistance is improved, but physical properties fluctuate leading to quality issues
Solution Approach 1:
The patent applies parameter changes by controlling the water content of the polyrotaxane monomer to 5000 ppm or less when used in polishing pad materials. This parameter control ensures consistent physical properties and reliable quality of the cured polishing pads, while maintaining the wear resistance benefits provided by the polyrotaxane structure.
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 solution prevents fluctuations in physical properties of cured products, improving productivity and stability while maintaining excellent mechanical characteristics, resulting in high-quality materials with enhanced photochromic and polishing performance.
Implementation Method 1
a polyrotaxane monomer having a polymerizable functional group in the molecule and containing an impurity of water in an amount of 5000 ppm or less
Data Source
Figure 1
AI summary
The invention is a polyrotaxane monomer (A) having a composite molecular structure composed of cyclic molecules and an axial molecule that skewer-like threads through the rings of the cyclic molecules and has a bulky group at both ends thereof so as not to dethread the rings, and the polyrotaxane monomer has a polymerizable functional group in the molecule and has a water content of 5000 ppm or less. According to the present invention, there can be provided a polyrotaxane monomer having a high productivity and capable of producing a high-quality material at a high yield, while maintaining excellent mechanical characteristics of the polyrotaxane monomer.