Silane Copolymer Adhesive for Optical Devices Resisting Heat and Light
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Solution Overview
Problem
Current curable compositions used for optical devices face challenges in achieving excellent heat resistance, transparency, and adhesion, particularly when exposed to high-energy light or high temperatures, leading to issues like cracking or delamination.
Innovation Solution
A curable composition comprising a specific silane compound copolymer, a silane coupling agent with a reactive cyclic ether structure, and a curing agent in a specific ratio, which produces a cured product with enhanced transparency and heat resistance while maintaining high adhesion even at elevated temperatures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a curable composition is used as an optical device-securing composition to achieve high adhesion, then adhesion is improved, but heat resistance and transparency deteriorate when exposed to high-energy light or high temperatures
Solution Approach 1:
The patent uses a composite material system consisting of a silane compound copolymer (containing both ladder structure units for heat resistance and non-ladder structure units for adhesion), silane coupling agent, and curing agent. This composite approach allows the cured product to simultaneously achieve high adhesion to optical devices and substrates, excellent heat resistance, and maintained transparency under high-energy light exposure.
Solution Approach 2:
The silane compound copolymer contains different repeating units with different functions: ladder structure repeating units provide heat resistance, while non-ladder structure repeating units provide adhesion. By incorporating both types of units in specific proportions within the same polymer chain, the material achieves local functional differentiation that resolves the contradiction between adhesion and heat resistance.
2Temperature
If a polysilsesquioxane compound is used as the main component to improve heat resistance, then heat resistance is improved, but transparency and adhesion are insufficient
Solution Approach 1:
The silane compound copolymer contains different repeating units with different functions: ladder structure repeating units provide heat resistance, while non-ladder structure repeating units provide adhesion. By incorporating both types of units in specific proportions within the same polymer chain, the material achieves local functional differentiation that resolves the contradiction between adhesion and heat resistance.
Solution Approach 2:
The patent uses a composite material system consisting of a silane compound copolymer (containing both ladder structure units for heat resistance and non-ladder structure units for adhesion), silane coupling agent, and curing agent. This composite approach allows the cured product to simultaneously achieve high adhesion to optical devices and substrates, excellent heat resistance, and maintained transparency under high-energy light exposure.
3Strength
If epoxy resin composition is used to improve adhesion, then adhesion is improved, but light resistance over time deteriorates
Solution Approach 1:
The patent changes the chemical composition parameters by using a silane compound copolymer with specific repeating unit ratios instead of conventional epoxy resin. The copolymer contains ladder structure units that provide excellent light resistance and non-ladder structure units that provide adhesion, achieving both requirements simultaneously through compositional parameter optimization.
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 composition effectively prevents deterioration in transparency and adhesion over time, even under high-energy light or high-temperature conditions, making it suitable for optical device-securing adhesives or sealing materials.
Implementation Method 1
A curable composition including (A) a silane compound copolymer, (B) a silane coupling agent having a reactive cyclic ether structure, and (C) a curing agent
Implementation Method 2
a silane coupling agent having a reactive cyclic ether structure
Data Source
AI summary
A curable composition that includes (A) a silane compound copolymer that includes a specific repeating unit, (B) a silane coupling agent having a reactive cyclic ether structure, and (C) a curing agent so that the mass ratio "(A):((B)+(C))" of the silane compound copolymer (A) to the silane coupling agent (B) and the curing agent (C) in total is 95:5 to 70:30, a cured product obtained by curing the curable composition, and method for using of the curable composition as an optical device-securing adhesive or an optical device sealing material, are disclosed. The curable composition produces a cured product that does not show coloration (i.e., does not show a deterioration in transparency) even when exposed to high-energy light or subjected to a high temperature, exhibits excellent transparency for a long time, and has high adhesion even at a high temperature. The curable composition may be used to form an optical device-securing material, and may suitably be used as an optical device-securing adhesive or an optical device sealing material.