Addition Cure Silicone Emulsion for Release Film Adhesion
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Solution Overview
Problem
Current addition cure silicone emulsion compositions face challenges with dehydrogenation during storage, poor adhesion to plastic film substrates, and difficulty in achieving both strong adhesion and easy peelability from pressure-sensitive adhesives, especially when used in optical and electronic applications.
Innovation Solution
A specific addition cure silicone emulsion composition is developed, comprising a crosslinker component and a surfactant, which minimizes dehydrogenation reactions and ensures good wettability and adhesion to plastic film substrates, allowing for a cured coating that is fully adherent yet lightly peelable from pressure-sensitive adhesives.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If emulsion type silicone compositions are used to reduce solvent amount, then ease of application is improved, but curability deteriorates due to high temperature requirement and poor adhesion
Solution Approach 1:
The patent changes the chemical composition parameters by incorporating specific adhesion promoters (silane-modified polymers) and optimizing the emulsion formulation to enable low-temperature curing. This allows the composition to cure effectively at reduced temperatures while maintaining adhesion to plastic substrates, resolving the curability issue of emulsion-type compositions.
2Ease of operation
If emulsion type silicone compositions are used, then ease of application is improved, but adhesion to substrate deteriorates due to water surface tension
Solution Approach 1:
The patent introduces adhesion promoters (silane-modified polymers with specific functional groups) as intermediary substances that bridge the water-based emulsion and the plastic substrate. These intermediaries improve wetting and bonding between the emulsion composition and substrate, overcoming the poor adhesion caused by water surface tension.
3Strength
If organohydrogenpolysiloxane is used in addition cure silicone emulsion, then adhesion is improved, but dehydrogenation during storage increases causing cure reduction
Solution Approach 1:
The patent applies preliminary protective measures by incorporating stabilizers and optimizing the formulation to prevent dehydrogenation reactions during storage. The composition is designed with components that inhibit premature curing and stabilize the organohydrogenpolysiloxane, maintaining adhesion properties while preventing composition degradation before application.
4Strength
If high content of adhesion-providing component is used to achieve adhesion to plastic film, then adhesion is improved, but peelability from PSA deteriorates
Solution Approach 1:
The patent applies local quality by using adhesion promoters that selectively bond to the plastic substrate while maintaining controlled interaction with the PSA layer. The adhesion-promoting components are localized at the substrate interface, providing strong substrate adhesion without excessive bonding to the PSA, thus preserving light peelability.
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 effectively reduces dehydrogenation, enhances adhesion to plastic film substrates, and allows for easy peeling from pressure-sensitive adhesives, making it suitable for release films in demanding applications like optical and electronic parts.
Implementation Method 1
since the organohydrogenpolysiloxane is in contact with water and surfactant in the emulsion, it often undergoes dehydrogenation during shelf storage or in treating bath
Implementation Method 2
addition cure silicone emulsion composition
Data Source
AI summary
A silicone emulsion composition is provided comprising organopolysiloxane, organohydrogenpolysiloxane, surfactant, and water. Two organopolysiloxanes of different type are blended, whereby a cured silicone coating is improved to be fully adherent to plastic film and lightly peelable from pressure-sensitive adhesive. By limiting the SiH content of organohydrogenpolysiloxane, the composition is improved in shelf stability. A specific surfactant is used to control the size of emulsion particles so as to improve wettability to plastic film.