UV-Curable Silicone PSA Composition for Adjustable Adhesion
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Solution Overview
Problem
Current UV-curable silicone pressure-sensitive adhesive (PSA) compositions face challenges in achieving adjustable bonding force without cohesive failure during peeling, limiting their applicability to microstructures and devices.
Innovation Solution
A UV cure type silicone PSA composition is developed using an organopolysiloxane with (meth)acryloyloxy-containing groups, combined with monofunctional and polyfunctional (meth)acrylate compounds, and an organopolysiloxane resin, along with a photopolymerization initiator, to achieve rapid curing and adjustable adhesiveness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If UV-curable silicone PSA composition is used to achieve rapid curing and strong bonding force, then curing time is reduced and bonding strength is improved, but cohesive failure occurs during peeling and PSA remains on the transferred object
Solution Approach 1:
The patent adjusts the bonding force parameters by controlling the UV irradiation dose and composition formulation. By varying these parameters, the adhesive achieves optimal bonding strength for different device weights while preventing cohesive failure during peeling operations.
Solution Approach 2:
The adhesive system provides dynamic bonding force adjustment through controllable UV curing. The bonding strength can be modulated by adjusting UV irradiation conditions, allowing the same material to adapt to different device weights and peeling requirements, thus resolving the contradiction between strong bonding and clean peeling.
2Strength
If bonding force is increased to lift heavier devices, then adhesion strength is improved, but cohesive failure is more likely to occur during peeling
Solution Approach 1:
The patent achieves adjustable bonding force by changing UV irradiation parameters and composition ratios. This allows optimization of adhesion strength for specific device weights while maintaining peeling reliability, resolving the contradiction between increased bonding force and reduced cohesive failure.
3Strength
If heat-cure type silicone PSA is used to achieve strong bonding, then adhesion strength is improved, but energy consumption increases and processing time is extended
Solution Approach 1:
The patent replaces the thermal curing mechanism with UV photopolymerization. This substitution eliminates the need for heating equipment and energy-intensive thermal processes, achieving comparable or superior adhesion strength with significantly reduced energy consumption and faster processing.
4Adaptability or versatility
If UV-curable silicone PSA with strong bonding force is used, then applicable range is expanded, but cohesive failure and PSA residue increase
Solution Approach 1:
The patent enables broad applicability through adjustable bonding force parameters. By modifying UV irradiation dose and composition, the adhesive can be optimized for different device weights and peeling requirements, expanding the applicable range while maintaining peeling reliability and preventing cohesive failure.
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 appropriate adhesiveness and strength, preventing cohesive failure and enabling effective temporary adhesion for transferring microstructures and devices.
Implementation Method 1
a UV cure type silicone pressure-sensitive adhesive composition... comprising: (A) 100 parts by weight of an organopolysiloxane having two groups of the following general formula (1) in the molecule, (B) a monofunctional (meth)acrylate compound free of siloxane structure and/or (C) a polyfunctional (meth)acrylate compound free of siloxane structure
Data Source
AI summary
An ultraviolet-curable pressure-sensitive silicone adhesive composition which comprises: 100 parts of an organopolysiloxane (A) having, in the molecule, two groups represented by general formula (1) (wherein R1 represents a C1-20 monovalent hydrocarbon group, R2 represents an oxygen atom, etc., R3 represents an acryloyloxyalkyl group, etc., p and a respectively indicate numbers satisfying 0 ≤ p ≤ 10 and 1 ≤ a ≤ 3); 1-500 parts of a monofunctional (meth)acrylate compound (B) containing no siloxane structure and/or a polyfunctional (meth)acrylate compound (C) containing no siloxane structure; 1-5,000 parts of an oranopolysiloxane resin (D) comprising R43SiO1/2 units (a) (wherein R4 represents a C1-10 monovalent hydrocarbon group) and Si04/2 units (b), the (a)/(b) molar ratio being (0.6-1.2)/1; and 0.01-20 parts of a photopolymerization initiator (E). This composition has satisfactory applicability and curability and gives a cured object which, when used as a temporary fixer, has excellent tackiness and strength.