Release Coating Composition With Extended Bathlife Stability
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Solution Overview
Problem
Conventional silicone compositions for release coatings face compatibility issues with inhibitors and hydrosilylation reaction catalysts, affecting bathlife and performance properties.
Innovation Solution
A composition comprising an organopolysiloxane with silicon-bonded ethylenically unsaturated groups and a hydrosilylation catalyst in the form of a metal-ligand complex, which enhances stability and extends bathlife.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Duration of action of stationary object
If inhibitors are included in conventional compositions for preparing release liners, then bathlife is extended and premature cure is minimized, but compatibility issues with hydrosilylation reaction catalysts arise that influence performance properties
Solution Approach 1:
The patent removes inhibitors from the composition entirely, relying instead on a stabilized catalyst system to achieve both extended bathlife and maintained performance. This extraction eliminates the compatibility issues between inhibitors and catalysts while preserving the desired duration of action.
Solution Approach 2:
The patent changes the catalyst system parameters by using a platinum-divinyltetramethyldisiloxane complex at controlled concentrations (0.01-500 ppm) to achieve stability without inhibitors. This parameter change allows the composition to maintain both extended bathlife and reliable performance properties.
2Ease of manufacture
If conventional silicone compositions use addition reacting with hydrosilylation catalysts, then release coatings can be formed, but bathlife is limited due to premature cure
Solution Approach 1:
The patent modifies the catalyst parameters by using a platinum-divinyltetramethyldisiloxane complex at optimized concentrations and controlling the SiH to vinyl group molar ratio (0.5:1 to 2:1). These parameter changes enable the composition to maintain ease of manufacture while significantly extending bathlife to 24-72 hours or more.
Solution Approach 2:
The patent creates a composite composition system combining organopolysiloxane with ethylenically unsaturated groups, organosilicon compound with silicon-bonded hydrogen atoms, and a stabilized platinum catalyst system. This composite approach enables both ease of manufacture and extended bathlife by ensuring compatibility and controlled reactivity among all components.
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 provides excellent stability at room temperature, resulting in an extended bathlife for release coating applications.
Implementation Method 1
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 composition for forming a release coating comprises (A) an organopolysiloxane comprising at least one RSiO3/2 siloxy unit or at least one SiO4/2 siloxy unit, where R is a substituted or unsubstituted hydrocarbyl group. The (A) organopolysiloxane has an average of at least two silicon-bonded ethylenically unsaturated groups per molecule. The composition further comprises (B) an organosilicon compound having an average of at least two silicon-bonded hydrogen atoms per molecule. Finally, the composition comprises (C) a hydrosilylation catalyst comprising a metal-ligand complex having the formula MLxDy, wherein M is a metal; x is equal to the oxidation state of M; each D is independently a neutral coordinating ligand; y is zero or an integer from 1 to 4; and each L is a mono-anionic ligand having a certain formula.