Polyether-Modified Optical Polymer Suppressing Convection Striae
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Solution Overview
Problem
Existing methods for manufacturing optical materials through thermally curing polymerizable compositions often result in striae defects, especially in thick items, due to convection and temperature differences, which can lead to production inefficiencies and costly facility investments for underwater polymerization.
Innovation Solution
Incorporating a specific polyether-modified compound into the polymerizable composition, such as polyether-modified siloxane, fluoro, or (meth)acrylic compounds, to reduce striae formation during polymerization, while extending the pot life of the composition and maintaining productivity and quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If curing is carried out slowly over a long period of time to suppress striae, then striae are suppressed, but production efficiency decreases
Solution Approach 1:
The patent changes the chemical composition parameter by introducing a polyether-modified compound with specific molecular structure (General Formula 1) into the monomer composition. This compositional parameter change suppresses convection during polymerization, thereby preventing striae formation while allowing faster curing cycles and maintaining high production efficiency.
2Manufacturing precision
If underwater polymerization is performed to increase heat conduction and suppress striae, then striae are suppressed, but facility cost increases
Solution Approach 1:
The patent replaces the expensive and complex underwater polymerization facility with a simple chemical additive (polyether-modified compound) that can be mixed into the monomer composition. This additive approach eliminates the need for specialized water-jacketed reactors and complex temperature control systems, significantly reducing facility investment while effectively suppressing striae through chemical means rather than physical cooling.
3Productivity
If monomer composition is used, then pot life is limited, but productivity is maintained
Solution Approach 1:
The patent modifies the pot life parameter by incorporating a polyether-modified compound that acts as a stabilizer in the monomer composition. This compound slows down the polymerization reaction rate, extending the pot life from typical short durations to at least 24 hours at room temperature, while still allowing complete curing and maintaining high production efficiency through extended working time.
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 use of polyether-modified compounds effectively suppresses striae formation, enhances the quality and appearance of the optical material, and improves production efficiency by extending the pot life and reducing defects, even in thick materials.
Implementation Method 1
striae are marks generated during the cast polymerization of monomers, or flowing marks which are cured by convection due to the influence of heat generation of monomers during polymerization
Implementation Method 2
underwater polymerization or the like may be performed to increase the heat conduction
Data Source
AI summary
There is provided a polymerizable composition for an optical material including a polyether-modified compound having a polyether group represented by General Formula (4) below, and a polymerization reactive compound.(In General Formula (4), R25 represents a linear or branched alkylene group having 1 to 20 carbon atoms, R26 represents a hydrogen atom, a linear or branched alkyl group having 1 to 20 carbon atoms, a linear or branched alkenyl group having 2 to 20 carbon atoms, or a linear or branched alkynyl group having 2 to 20 carbon atoms, a plurality of present R25's may be the same or different, and k is an integer equal to or more than 1.)