Release Coating Composition Minimizing Mist at High Speed
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Solution Overview
Problem
Conventional release coating processes for silicone compositions in high-speed coating applications often result in mist formation, which is undesirable without compromising the performance properties of the release liners.
Innovation Solution
A composition comprising a reaction product of a branched organopolysiloxane and an organosilicon compound with a hydrosilylation catalyst, formulated to minimize mist formation while maintaining performance, includes a molar excess of silicon-bonded ethylenically unsaturated groups to achieve partial crosslinking.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If high-speed coating process is used to prepare release liners, then productivity is improved, but mist formation occurs which is harmful
Solution Approach 1:
The patent changes the chemical composition parameters of the silicone coating by incorporating specific amounts of vinyl-functional polysiloxane (0.1-10 wt% based on total silicone composition) and using a controlled hydrosilylation reaction system. This parameter modification allows the coating to maintain stability at high coating speeds while preventing mist formation through partial crosslinking that reduces volatility.
Solution Approach 2:
The patent creates a composite silicone composition by combining multiple components: organopolysiloxane with unsaturated hydrocarbon groups, organohydrogenpolysiloxane, and vinyl-functional polysiloxane. This composite structure provides both the desired release properties and mist suppression capability, allowing high-speed coating without harmful mist generation.
2Ease of manufacture
If addition-curable silicone composition is used for release coating, then ease of manufacture is improved, but mist formation occurs during high-speed coating
Solution Approach 1:
The vinyl-functional polysiloxane acts as an intermediary component that moderates the reaction behavior of the addition-curable system. It provides controlled reactivity that prevents excessive mist formation during high-speed coating while maintaining the ease of manufacture benefits of addition curing, serving as a buffer between the reactive components.
Solution Approach 2:
The patent modifies the manufacturing parameters by controlling the vinyl group content (0.1-10 wt%) and the ratio of reactive components, which changes the volatility and reaction kinetics of the composition. This allows the coating to be applied at high speeds without mist formation while retaining the simplicity of addition-curing manufacturing processes.
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 solution effectively reduces mist formation during high-speed coating processes while maintaining the performance properties of the release liners, ensuring efficient and effective production.
Implementation Method 1
a composition for forming a release coating comprises (A) a reaction product of: (1) a branched organopolysiloxane; and (2) an organosilicon compound having an average of at least two silicon-bonded hydrogen atoms per molecule; in the presence of a hydrosilylation catalyst
Data Source
AI summary
A composition for forming a release coating is disclosed. The composition comprises (A) the reaction product of (1) a branched organopolysiloxane including M, D and Q siloxy units and an average of at least two silicon-bonded ethylenically un saturated groups per molecule; and (2) an organosilicon compound having an average of at least two silicon-bonded hydrogen atoms per molecule; in the presence of a hydrosilylation catalyst. The composition further comprises (B) an organopolysiloxane having an average of at least two silicon-bonded ethylenically unsaturated groups per molecule.