Curable Silicone Composition for Optical Substrate Adhesion
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Solution Overview
Problem
Existing curable silicone compositions exhibit poor adhesion properties against various substrates used in optical displays.
Innovation Solution
A curable silicone composition comprising specific diorganopolysiloxane, resinous organopolysiloxane, organopolysiloxane with silicon-bonded hydrogen atoms, and a hydrosilylation reaction catalyst, along with optional hydrosilylation reaction inhibitors, to form a cured product with enhanced adhesion properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If conventional curable silicone compositions are used, then high transparency and high elongation are achieved, but adhesion properties against various substrates deteriorate
Solution Approach 1:
The patent changes the chemical parameters of the silicone composition by incorporating specific components: a resinous organopolysiloxane with alkenyl groups (component B), an organopolysiloxane with silicon-bonded hydrogen atoms (component C), and a hydrosilylation catalyst (component D). These parameter changes enable chemical bonding to substrates while maintaining the base polymer's transparency and elongation properties.
Solution Approach 2:
The patent creates a composite curable silicone system combining multiple components: component (A) diorganopolysiloxane provides the base polymer matrix, component (B) resinous organopolysiloxane adds adhesion functionality, component (C) organopolysiloxane with Si-H bonds enables crosslinking, and component (D) catalyst facilitates the reaction. This composite approach achieves both optical properties and adhesion performance.
2Strength
If the composition is optimized for adhesion, then adhesion properties improve, but the simplicity of the original formulation is lost
Solution Approach 1:
The patent incorporates component (B) resinous organopolysiloxane with alkenyl groups in advance, which is specifically designed to bond with substrates. This preliminary inclusion of adhesion-promoting functionality eliminates the need for additional adhesion layers or post-processing steps, simplifying the overall application process despite the multi-component nature.
Solution Approach 2:
Component (B) resinous organopolysiloxane acts as an intermediary between the base silicone polymer (component A) and the substrate. It provides alkenyl groups that can chemically bond to substrates while maintaining compatibility with the silicone matrix, thus mediating the adhesion function without requiring complex multi-layer structures.
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 cured product demonstrates excellent adhesion properties against various substrates, suitable for optical devices, with improved mechanical properties and adhesion strength.
Implementation Method 1
a curable silicone composition comprising: (A) a diorganopolysiloxane represented by general formula (1), (B) a resinous organopolysiloxane, (C) an organopolysiloxane having a silicon-bonded hydrogen atom, and (D) an effective amount of a hydrosilylation reaction catalyst
Data Source
AI summary
A curable silicone composition contains (A) a diorganopolysiloxane having two silicon-bonded alkeny groups at both molecular chain terminals; (B) anorganopolysiloxane resin having a silicon-bonded alkenyl group; (C) an organopolysiloxane having a silicon-bonded hydrogen atomand consisting essentially of (c1) a diorganopolysiloxane having silicon-bonded hydrogen atoms at both molecular chain terminals and (c2) an organopolysiloxane resin having a silicon-bonded hydrogen atom; and (D) a hydrosilylation reaction catalyst. The composition can be cured to form a cured product exhibiting excellent adhesion properties against various substrates using for optical devices.