Curable Resin Composition for Low-Temperature Lens Reliability
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Solution Overview
Problem
Cured products from conventional ultraviolet-curable resin compositions exhibit insufficient reliability at low temperatures, leading to issues such as cracks and distortion in applications like optical lenses.
Innovation Solution
A curable resin composition comprising a diglycidyl ether compound with a bisphenol skeleton, a bifunctional alicyclic epoxy compound, and a trifunctional or higher polyfunctional epoxy compound with an isocyanurate ring structure, where the diglycidyl ether compound constitutes 30% or more and the polyfunctional epoxy compound constitutes 20% or less of the total resin mass, enhancing the reliability of the cured product at low temperatures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional ultraviolet-curable resin compositions are used, then the lens can be manufactured with standard properties, but the reliability at low temperatures is insufficient leading to cracks and distortion
Solution Approach 1:
The patent changes the chemical composition parameters of the resin system by specifying exact content ranges: diglycidyl ether compound (30-50 mass%), bifunctional alicyclic epoxy compound (20-50 mass%), and polyfunctional epoxy compound with isocyanurate ring (10-20 mass%). This parameter optimization resolves the contradiction by achieving both manufacturability and low-temperature reliability.
Solution Approach 2:
The patent creates a composite resin system combining three different epoxy compound types with specific functional characteristics. The diglycidyl ether compound provides base resin properties, the bifunctional alicyclic epoxy compound enhances low-temperature flexibility, and the polyfunctional isocyanurate epoxy compound contributes to crosslinking density and heat resistance, collectively resolving the reliability issue.
2Temperature
If the content of polyfunctional epoxy compound is increased to improve crosslinking density, then heat resistance improves, but low-temperature reliability deteriorates due to increased brittleness
Solution Approach 1:
The patent precisely controls the content of polyfunctional epoxy compound with isocyanurate ring at 10-20 mass%, preventing excessive crosslinking that would cause brittleness. Simultaneously, it maintains adequate crosslinking density for heat resistance by not reducing it below this range, thus resolving the contradiction between heat resistance and low-temperature reliability.
Solution Approach 2:
The patent creates different local structural characteristics within the resin system: the diglycidyl ether and bifunctional alicyclic epoxy compounds provide flexible segments that maintain low-temperature ductility, while the polyfunctional isocyanurate epoxy compound provides crosslinked regions that ensure heat resistance. This spatial differentiation of material properties resolves the temperature-dependent reliability contradiction.
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 results in a cured product with improved reliability and durability at low temperatures, resisting cracks and distortion, and maintaining excellent heat resistance, as evidenced by increased breaking stress, tensile modulus, and Abbe number.
Implementation Method 1
A curable resin composition comprising: a diglycidyl ether compound having a bisphenol skeleton; a bifunctional alicyclic epoxy compound (excluding the diglycidyl ether compound); and a trifunctional or higher polyfunctional epoxy compound having an isocyanurate ring structure
Data Source
AI summary
One aspect of the present invention provides: a curable resin composition from which a cured product with excellent reliability at low temperatures can be obtained; a cured product and a lens with excellent reliability at low temperatures; and a substrate-attached lens comprising the lens.The curable resin composition according to one aspect of the present invention comprises a diglycidyl ether compound having a bisphenol skeleton, a bifunctional alicyclic epoxy compound (excluding the diglycidyl ether compound), and a trifunctional or higher polyfunctional epoxy compound having an isocyanurate ring structure. The content of the diglycidyl ether compound is 30% by mass or more and the content of the polyfunctional epoxy compound is 20% by mass or less with respect to the total mass of resin components in the curable resin composition.The cured product is one obtained by curing the curable resin composition of the present invention.The lens comprises a cured product of the curable resin composition of the present invention.The substrate-attached lens comprises a substrate and the lens provided on the substrate.