Silicone Release Coating Composition with Functional Silica
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Solution Overview
Problem
Existing silicone release coating compositions exhibit high cure density, resulting in high release force, which is not suitable for applications requiring low release force and stable adhesion to substrates.
Innovation Solution
A silicone release coating composition comprising an organopolysiloxane with alkenyl groups, silicon-bonded hydrogen atoms, organic modified functional silica particles, and a hydrosilylation reaction catalyst, along with optional inhibitors and anchorage additives, is formulated to achieve a low release force and improved adhesion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Force
If conventional silicone release coating compositions are used, then the coating forms a dense cured structure, but the release force becomes too high for applications requiring low release force
Solution Approach 1:
The coating composition creates different local structures: hydrophobic silica particles create low-energy release surfaces while hydrophilic silica particles provide strong substrate adhesion. This local differentiation allows the coating to simultaneously achieve low release force and reliable substrate bonding.
Solution Approach 2:
The invention changes the particle size parameter of silica, using a bimodal distribution with small particles (0.1-5 μm) for release properties and large particles (5-15 μm) for adhesion properties. This parameter variation enables the coating to satisfy conflicting requirements of low release force and strong substrate bonding.
2Strength
If high cure density is achieved, then the coating structure becomes more robust, but the release force increases making it unsuitable for low release force applications
Solution Approach 1:
The invention uses a composite system combining hydrophobic and hydrophilic silica particles with organopolysiloxane resin. This composite structure provides both mechanical strength from the cured resin network and controlled release properties from the hydrophobic particles, resolving the contradiction between structural robustness and low release force.
3Reliability
If the coating provides strong anchorage to substrate, then the adhesion improves, but the release force may become inconsistent or too high
Solution Approach 1:
Hydrophilic silica particles are positioned at the substrate interface to provide strong anchorage through hydrogen bonding and adhesion, while hydrophobic silica particles form the outer release surface. This local functional differentiation ensures stable release force while maintaining reliable substrate anchorage.
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 forms a cured release coating with reduced release force and enhanced slipperiness, while maintaining suitable peel resistance and adhesion to substrates, making it suitable for applications like pressure-sensitive tapes and labels.
Implementation Method 1
an organopolysiloxane having at least two alkenyl groups in a molecule, an organopolysiloxane having at least two silicon-bonded hydrogen atoms in a molecule
Implementation Method 2
organic modified functional silica particles having an average particle size of 5 μm to 15 μm and a BET specific surface area of 600 m²/g or more
Data Source
AI summary
This invention relates to a silicone release coating composition comprising : (A) an organopolysiloxane having at least two alkenyl groups in a molecule, (B) an organopolysiloxane having at least two silicon-bonded hydrogen atoms in a molecule, (C) organic modified functional silica particles having an average particle size of 5 μm to 15 μm and a BET specific surface area of 600 m2/g to 800 m2/g, and (D) a hydrosilylation reaction catalyst. The composition can form a coating with a lower release force to sticky adhesive.