Curable Composition for Low-Temperature Flexibility and Thermal Stability
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Solution Overview
Problem
Curable compositions based on fluoro(poly)ether compounds are unsuitable for low-temperature applications as they lose rubber properties and are prone to decomposition at high temperatures, posing contamination risks in semiconductor manufacturing.
Innovation Solution
A curable composition comprising a perfluoro(poly)ether group-containing silane compound with specific structural units and an organosilicon compound, along with a catalyst, to form a cured product with low elastic modulus at low temperatures and high thermal stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional fluoro(poly)ether-based composition is used, then water-repellency and oil-repellency are achieved, but the cured product loses rubber properties at low temperatures and decomposes at high temperatures
Solution Approach 1:
The invention changes the chemical structure parameters of the fluoro(poly)ether group by introducing specific repeating units with different chain lengths and compositions. The formula specifies precise ranges for parameters a through f, where each represents a different repeating unit type. By adjusting these parameters within the specified ranges, the composition achieves optimal low-temperature flexibility while maintaining high-temperature stability, resolving the contradiction between low-temperature rubber properties and high-temperature resistance.
Solution Approach 2:
The invention creates a composite molecular structure within the fluoro(poly)ether chain by combining multiple types of repeating units (represented by parameters a-f) in specific proportions. This composite approach allows different segments of the polymer chain to contribute different properties: some segments provide low-temperature flexibility while others provide high-temperature stability, thereby resolving the temperature range contradiction.
2Ease of operation
If the cured product is made flexible at low temperatures, then rubber properties are maintained, but decomposition resistance at high temperatures deteriorates
Solution Approach 1:
The invention applies local quality by creating distinct segments within the fluoro(poly)ether chain, where specific repeating units (represented by parameters e and f for shorter chains) provide local flexibility for low-temperature operation, while other repeating units (parameters a, b, c, d for longer chains) provide local thermal stability. This spatial differentiation of functional segments within the same polymer chain resolves the contradiction between flexibility and decomposition resistance.
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 enables the formation of a cured product with improved low-temperature rubber properties and high thermal stability, suitable for use in semiconductor manufacturing without decomposing at high temperatures, thus preventing contamination.
Implementation Method 1
a perfluoro(poly)ether group-containing silane compound which is a 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
Implementation Method 2
an organosilicon compound having at least two —O—Rg3(s) each bonding to a Si atom, wherein each Rg3, at each occurrence, is independently a hydrogen atom or a monovalent organic group, and a catalyst
Data Source
AI summary
A curable composition including a perfluoro(poly)ether group-containing silane compound having two or more Si atoms each bonding to at least one selected from a hydroxyl and hydrolyzable group, and a group represented by: —(OC6F12)a—(OC5F10)b—(OC4F8)c—(OC3X106)d—(OC2F4)e—(OCF2)f—, wherein a, b, c and d are each independently an integer of 0 to 30, e and f are each independently an integer of 1 to 200, the sum of a, b, c, d, e and f is 5 or more, the occurrence order of the respective repeating units with the subscript a, b, c, d, e or f is not limited, a ratio of e to f is 1.0 or more, and each X10 is independently a hydrogen, fluorine or chlorine atom; an organosilicon compound having at least two —O—Rg3(s) each bonding to a Si atom, wherein each Rg3, at each occurrence, is independently a hydrogen atom or a monovalent organic group; and a catalyst.