Fluoropolyether Curable Composition Transparency
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Solution Overview
Problem
The use of condensation promoters in existing fluoropolyether-based compositions results in a low degree of transparency in cured products, which is undesirable for certain applications.
Innovation Solution
A curable composition comprising a fluorine-containing silane compound, an organosilicon compound with multiple —O—Rg3 groups, and a metal-based catalyst M(-O—Rh)η, where M is a metal atom, Rh is a hydrocarbon group with 1 to 3 carbon atoms, and η is the coordination number of M, to enhance the transparency of the cured product.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a condensation promoter (catalyst) is used to cure the fluoropolyether-based composition, then the curing reaction is promoted and the composition sets properly, but the degree of transparency of the cured product becomes low
Solution Approach 1:
The patent changes the chemical parameter of the catalyst by selecting specific metal-based catalysts (organometallic compounds with metal atoms such as aluminum, boron, silicon, tin, or zinc) instead of conventional condensation promoters. This parameter change enables the curing reaction to proceed while maintaining high transparency of the cured product, resolving the contradiction between curing promotion and transparency.
2Reliability
If dibutyltin dimethoxide or dibutyltin lauryrate is used as a condensation promoter, then the composition cures effectively, but the cured product exhibits low transparency
Solution Approach 1:
The patent extracts the problematic condensation promoter (dibutyltin dimethoxide or dibutyltin lauryrate) from the composition and replaces it with alternative metal-based catalysts. This extraction eliminates the transparency-reducing effect while preserving the curing effectiveness through the use of alternative catalysts such as organometallic compounds.
3Ease of manufacture
If existing condensation promoters are used, then the composition can be cured, but the cured product has poor transparency which limits its application range
Solution Approach 1:
The patent changes the catalyst parameter to metal-based catalysts (aluminum, boron, silicon, tin, or zinc compounds) instead of conventional condensation promoters. This parameter change enables both effective curing and high transparency, thereby expanding the application range of the cured product to include applications requiring optical clarity while maintaining ease of manufacture.
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 improves the transparency of the cured product while maintaining water-repellency and chemical resistance, making it suitable for a wide range of applications.
Implementation Method 1
a metal-based catalyst represented by M(-O—Rh)η, wherein: M represents a metal atom; each Rh, at each occurrence, is independently a hydrocarbon group having 1 to 3 carbon atoms; and η is the coordination number of M
Implementation Method 2
a fluorine-containing silane compound having two or more Si atoms each bonding to at least one group selected from the group consisting of a hydroxyl group and a hydrolyzable group
Data Source
AI summary
A curable composition including a fluorine-containing silane compound having two or more Si atoms each bonding to at least one group selected from the group consisting of a hydroxyl group and a hydrolyzable group, an organosilicon compound having at least two —O—Rg3(s) each bonding to a Si atom, wherein each Rg3, at each occurrence, independently represents a hydrogen atom or monovalent organic group, and a metal-based catalyst represented by M(-O—Rh)η, wherein: M represents a metal atom; each Rh, at each occurrence, independently represents a hydrocarbon group having 1 to 3 carbon atoms; and η is the coordination number of M.