Polymerizable Silicone Composition for Heat-Resistant Optical Adhesives
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Solution Overview
Problem
Current optical adhesives for photoelectrical composite substrates face challenges in achieving high heat resistance while maintaining transparency and workability, as introducing rigid structures increases viscosity and fragility, and dilution with low viscosity solvents can impair heat resistance due to volatility at low temperatures.
Innovation Solution
A polymerizable composition comprising a reactive silicone compound obtained by polycondensing diaryl silicic acid with a silane compound, combined with a reactive diluent having polymerizable groups, which adjusts viscosity and refractive index, and optionally includes inorganic fine particles for enhanced properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If a rigid structure is introduced to increase heat resistance, then heat resistance is improved, but viscosity increases and the cured product becomes hard and fragile
Solution Approach 1:
The patent uses a composite material system combining polyorganosiloxane (providing heat resistance) with reactive diluent containing polymerizable groups (adjusting viscosity). This composite approach allows simultaneous achievement of high heat resistance and proper workability without relying on a single material with conflicting properties.
Solution Approach 2:
The patent adjusts the composition parameters by controlling the ratio of polyorganosiloxane to reactive diluent, and by selecting specific polymerizable groups (alkenyl or (meth)acryl). This parameter optimization enables tuning of viscosity while preserving the heat resistance properties of the siloxane backbone.
2Ease of operation
If low viscosity solvents are used to reduce viscosity, then workability is improved, but heat resistance is impaired due to volatility at low temperatures
Solution Approach 1:
The patent employs a reactive diluent that serves its purpose during application and then undergoes polymerization to become part of the permanent cured structure. Unlike volatile solvents that evaporate and leave voids, this reactive diluent permanently integrates into the network, maintaining heat resistance while providing temporary viscosity reduction during application.
Solution Approach 2:
The reactive diluent acts as an intermediary substance that temporarily reduces viscosity for good workability, then transforms through polymerization into a structural component that maintains heat resistance. It mediates between the conflicting requirements of low viscosity during application and high heat resistance in the final product.
3Ease of manufacture
If the refractive index is adjusted to reduce light loss, then optical performance is improved, but the composition complexity increases
Solution Approach 1:
The patent adjusts the refractive index by selecting specific combinations of polyorganosiloxane and reactive diluent with appropriate refractive indices. This localized adjustment of optical properties through composition selection, rather than adding complex refractive index matching layers or coatings, simplifies the overall device structure while achieving optimal optical performance.
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 achieves excellent heat resistance up to 300°C or more, maintains transparency in near-infrared wavelengths, and allows for adjustable physical properties of the cured product, such as refractive index and hardness, while ensuring good workability and reliability for optical applications.
Implementation Method 1
a reactive silicone compound obtained by polycondensing a diaryl silicic acid compound of Formula (1) below with a silane compound of Formula (2) or (2b) below
Implementation Method 2
a photopolymerization initiator
Data Source
Figure 1~2
AI summary
[Problem] To provide a polymerizable composition having an excellent transparency in near-infrared wavelength and excellent heat resistance, and a method for producing the same. [Means of Solving the Problem] A polymerizable composition includes: a reactive silicone compound obtained by polycondensing a diaryl silicic acid compound of Formula [1] below with a silane compound, selected under compounds of Formula [2] and Formula [2b] below in the presence of an acid or a base; and (b) a compound having at least one polymerizable group selected from the group consisting of alkenyl group and (meth)acryl group, wherein Ar1 and Ar2 are independently a phenyl group optionally substituted with a C1-C6 alkyl group, and X is a group which can undergo a hydrolytic condensation reaction, and wherein Ar3 is naphthyl or anthracyl substituted with at least one group having a polymerizable double bond, or wherein Ar3 is phenyl substituted with at least one group having a polymerizable double bond other than vinyl, or is phenyl substituted with at least two groups having a polymerizable double bond.