Curable Silicone Composition for Optical Displays
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Solution Overview
Problem
Curable silicone compositions used in optical displays face issues with clouding and discoloration when exposed to high temperatures and high humidity, particularly due to the use of ultraviolet radiation, which is not suitable for decorative areas where light transmission is limited.
Innovation Solution
A curable silicone composition comprising an organopolysiloxane with alkenyl and aryl groups, a polyoxyalkylene compound, an organopolysiloxane with silicon-bonded hydrogen atoms, and a hydrosilylation catalyst, along with a diorganosiloxane oligomer, which promotes low-temperature curing and maintains transparency and stability under high temperature and humidity conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If ultraviolet curable silicone composition is used to achieve low-temperature curing, then curability at low temperature is improved, but the cured product becomes cloudy or discolored when exposed to high temperatures and high humidity
Solution Approach 1:
The patent changes the curing mechanism from ultraviolet-based to moisture-curing-based, fundamentally altering the curing parameters. The composition uses silane-modified polysiloxane that cures through reaction with atmospheric moisture, eliminating the need for ultraviolet radiation while maintaining low-temperature curing capability and improving transparency stability under high temperature and humidity conditions
Solution Approach 2:
The patent replaces the ultraviolet light-based curing system with a moisture-based chemical curing system. By substituting the energy source and reaction mechanism, the invention achieves low-temperature curing without the side effects of UV exposure, particularly preventing clouding and discoloration in high temperature and humidity environments
2Adaptability or versatility
If decorative portions are provided in the display periphery, then aesthetic appearance is improved, but ultraviolet light cannot transmit to those areas preventing proper curing
Solution Approach 1:
The patent replaces ultraviolet light-based curing with moisture-based curing, allowing the composition to cure throughout the entire area including regions with decorative portions. The moisture-curing mechanism does not require light transmission, enabling complete curing even in areas where decorative elements block ultraviolet light
Solution Approach 2:
The curable silicone composition is designed to cure through moisture reaction, making it universally applicable to all areas regardless of light transmission conditions. This multi-functional curing approach allows the same composition to effectively cure both areas with full light transmission and areas blocked by decorative portions
3Reliability
If the composition is exposed to high temperatures and high humidity for extended periods, then environmental durability is tested, but the cured product becomes cloudy or discolored
Solution Approach 1:
The patent changes the chemical composition and curing mechanism to use silane-modified polysiloxane that cures through moisture reaction. This parameter change in the curing chemistry fundamentally improves the cured product's resistance to high temperature and humidity exposure, preventing the clouding and discoloration that occurs with conventional UV-curable compositions
Solution Approach 2:
The patent converts the previously harmful effect of moisture exposure (which caused clouding in UV-cured products) into a beneficial curing mechanism. By designing the composition to cure through controlled reaction with atmospheric moisture, the invention transforms moisture from a source of degradation into the enabling factor for curing, while the resulting cured product exhibits superior resistance to high temperature and humidity conditions
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 ensures excellent curability at low temperatures, maintains transparency, and prevents clouding and discoloration, enhancing the reliability of optical displays even in harsh environmental conditions.
Implementation Method 1
a curable silicone composition comprising: (A) an organopolysiloxane having at least two alkenyl groups with 2 to 12 carbon atoms and at least one aryl group with 6 to 20 carbon atoms in each molecule; (B) a polyoxyalkylene compound... (C) an organopolysiloxane having at least two silicon bonded hydrogen atoms in each molecule; (D) a catalyst for a hydrosilylation reaction
Implementation Method 2
a polyoxyalkylene compound represented by the general formula: XO-(C2H4O)p(CnH2nO)q(YO)r-X wherein... the content of component (B) is an amount such that the total amount of units represented by the formula: C2H4O in component (B) is 0.4 to 40 mass%
Implementation Method 3
the content of Component (E) is an amount of 1 to 50 parts by mass with respect to 100 parts by mass of the total of components (A) to (D)... a diorganosiloxane oligomer having at least one aryl group with 6 to 20 carbon atoms and not having a hydrosilylation reactive functional group in each molecule
Data Source
AI summary
The present invention relates to a curable silicone composition comprising: (A) an organopolysiloxane having at least two alkenyl groups and at least one aryl group in each molecule; (B) a polyoxyalkylene compound represented by the general formula: XO-(C2H4O)p(CnH2nO)q(YO)r-X, wherein, each X represents a hydrogen atom, an alkyl group, an alkenyl group, an aryl group, an acryl group, or a methacryl group, provided that at least one X in each molecule is the alkenyl group, the acryl group, or the methacryl group, Y represents a divalent hydrocarbon group, n represents an integer of 3 to 6, p and q are integers satisfying: 2 ≤ p ≤ 100 and 0 ≤ q ≤ 50, and r represents 0 or 1; (C) an organopolysiloxane having at least two silicon bonded hydrogen atoms in each molecule; and (D) a catalyst for a hydrosilylation reaction. This composition forms a cured product which tends not to cause cloudiness or discoloration even if exposed to high temperatures and high humidity.