Release Coating Composition Reducing Mist Formation
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Solution Overview
Problem
Conventional release coating compositions often form mists during high-speed coating processes, which is undesirable, and existing solutions do not adequately address this issue without compromising the performance properties of the release liners.
Innovation Solution
A method of preparing a branched cyclic polyorganohydrogensiloxane compound by reacting hydroxyl terminated polydiorganosiloxane with cyclic polyorganohydrogensiloxane in the presence of a boron-containing Lewis acid, combined with a polyorganohydrogensiloxane diluent, to form a release coating composition that minimizes mist formation while maintaining performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If conventional release coating compositions are used in high-speed coating processes, then productivity is improved, but mist formation increases causing harmful effects
Solution Approach 1:
The invention changes the chemical composition parameters of the release coating by incorporating specific additives (polyorganosiloxane with vinyl groups, organohydrogenpolysiloxane, and hydrosilylation catalyst) that modify the coating's behavior during high-speed application, reducing mist formation while maintaining coating quality
Solution Approach 2:
The invention creates a composite release coating composition by combining multiple silicone compounds with specific functionalities. The synergistic interaction between the vinyl-containing polyorganosiloxane, organohydrogenpolysiloxane, and catalyst forms a composite system that reduces mist formation during high-speed coating
2Object-generated harmful factors
If additives are added to reduce mist formation, then harmful effects are reduced, but composition complexity increases
Solution Approach 1:
The polyorganosiloxane additive serves multiple functions simultaneously: it acts as a mist-reducing agent during high-speed coating and provides release functionality in the final cured coating. This multi-functionality reduces composition complexity by eliminating the need for separate additives for each function
3Productivity
If high-speed coating is implemented, then productivity is improved, but mist formation increases causing loss of substance
Solution Approach 1:
The invention modifies the rheological and chemical parameters of the release coating composition by adding specific silicone compounds that reduce volatility and mist formation during high-speed coating, thereby minimizing material loss while maintaining high productivity
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 coating processes while maintaining the performance properties of the release liners, ensuring efficient and reliable production.
Implementation Method 1
reacting together: (A) a hydroxyl terminated polydiorganosiloxane... and (B) a cyclic polyorganohydrogensiloxane... in the presence of a boron-containing Lewis acid
Implementation Method 2
Conventional release liners are typically formed by addition reacting (or hydrosilylating) an organopolysiloxane having an unsaturated hydrocarbon group and an organohydrogenpolysiloxane in the presence of a hydrosilylation reaction catalyst
Data Source
AI summary
A method of preparing a composition for forming a release coating is disclosed. The method comprises preparing a reaction product comprising a polyorganohydrogensiloxane compound having cyclic SiH-functional branching groups interconnected by linear polydiorganosiloxane segments (the "branched cyclic polyorganohydrogensiloxane compound"), by combining together (A) a hydroxyl terminated polydiorganosiloxane and (B) a cyclic polyorganohydrogensiloxane, in the presence of (C) a boron containing Lewis acid and a solvent. A release coating composition including the reaction product comprising the branched cyclic polyorganohydrogensiloxane is also disclosed. The reaction product may be combined with or prepared in the presence of a polyorganohydrogensiloxane diluent and stripped of solvent to prepare the composition as a blend of the branched cyclic polyorganohydrogensiloxane and the polyorganohydrogensiloxane diluent for use in solventless-curable compositions.