Optical Substrate with Embedded Silane-Functionalized Particles
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Solution Overview
Problem
Optical articles made of organic materials face challenges with abrasion and scratch resistance, as they are more sensitive compared to mineral glass, and existing surface coating methods are complex, costly, and require multiple manufacturing steps, making it difficult to achieve enhanced mechanical properties without compromising the polymerization process or increasing product costs.
Innovation Solution
Embedding specific particles, preferably nanoparticles, into the polymer matrix of the organic glass substrate during the manufacturing process, where the particles are functionalized with a silane coupling agent and have a refractive index lower than the polymer matrix, thereby improving the substrate's mechanical properties without the need for hard surface coatings.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If hard surface coatings are applied to improve abrasion and scratch resistance, then mechanical properties are enhanced, but manufacturing complexity and cost increase significantly
Solution Approach 1:
The patent combines the substrate material and abrasion-resistant particles into a single integrated component. Particles are embedded directly into the polymer matrix during manufacturing, merging the substrate formation and surface hardening processes into one step, thereby eliminating the need for separate coating applications and reducing manufacturing complexity
Solution Approach 2:
The patent creates a composite material by incorporating abrasive-resistant particles (such as alumina, silica, or diamond particles) into the polymer matrix. This composite structure provides both the flexibility of organic material and the hardness of inorganic particles, achieving enhanced abrasion and scratch resistance without requiring additional surface coatings
2Reliability
If multiple coating steps are used to achieve proper adhesion and functionality, then surface properties are improved, but productivity decreases due to longer preparation time
Solution Approach 1:
The patent performs preliminary action by pre-mixing particles with the polymer matrix before substrate formation. This ensures particles are uniformly distributed and properly positioned within the matrix before the substrate is manufactured, eliminating the need for subsequent coating steps and accelerating production while maintaining reliable particle integration
Solution Approach 2:
The patent merges substrate manufacturing and particle integration into a single simultaneous process. Particles are incorporated during the polymerization or molding process itself, combining what would traditionally be separate operations (substrate formation followed by coating) into one unified manufacturing step, thereby increasing productivity
3Strength
If particles with high refractive index are used to enhance hardness, then mechanical properties improve, but optical transparency deteriorates
Solution Approach 1:
The patent applies parameter changes by carefully selecting particles with refractive indices that closely match the polymer matrix (within ±0.05 to ±0.10 units). This parameter optimization allows particles to provide mechanical reinforcement while remaining optically invisible, maintaining substrate transparency despite the presence of hard particles throughout the matrix
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
This approach significantly enhances the abrasion and scratch resistance of the optical articles, as demonstrated by a 30% greater Bayer value, while maintaining transparency and reducing production complexity and costs, allowing for the creation of economical lenses with improved mechanical properties.
Implementation Method 1
the particles are functionalized with a silane coupling agent
Implementation Method 2
an optical material comprising a polymer matrix
Data Source
Figure 1
AI summary
The invention relates toan optical article having a substrate made of an optical material comprising a polymer matrix and an improved abrasion and/or scratch resistance. The substrate comprises an external layer in which particles functionalized by a silane coupling agent are embedded into the polymer matrix,the Bayer value of said substrate determined in accordance with the ASTM F735-81 standard being at least 30 % greater than the Bayer value of the same substrate with no embedded particles.