Silsesquioxane Polymers with Free Siloxanes for Release Coatings
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Solution Overview
Problem
Silsesquioxane materials with reactive silanol groups have limited shelf-life and solubility, and residual acids or bases from curing mechanisms can cause corrosion, necessitating the development of new silsesquioxane materials with improved properties.
Innovation Solution
The development of silsesquioxane polymers with a three-dimensional network structure, combined with free siloxanes, which provide excellent water repellency and superior release properties, enhancing the release adhesion strength without compromising adhesion, as demonstrated by the unique co-crystallization of hydrocarbon chains and the incorporation of a free siloxane in compositions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If silsesquioxane materials with reactive silanol groups are used, then curability and solid film formation are achieved, but shelf-life and solubility are limited
Solution Approach 1:
The patent extracts the problematic reactive silanol groups from the silsesquioxane structure by replacing them with inert alkyl groups. This creates a stable, non-reactive core structure that eliminates self-condensation issues while preserving the desired curability through controlled reaction with external agents like isocyanates or epoxies.
Solution Approach 2:
The patent changes the chemical parameters of the silsesquioxane by substituting hydrolyzable groups (alkoxysilane or chlorosilane) with non-hydrolyzable alkyl groups. This parameter change transforms the material from one that spontaneously condenses to one that remains stable during storage but can still be cured through alternative mechanisms.
2Reliability
If silsesquioxane materials with reactive silanol groups are used, then curability is achieved, but solubility is limited
Solution Approach 1:
The patent removes the polar silanol groups that cause limited solubility by replacing them with non-polar alkyl groups. This extraction of polar functional groups fundamentally changes the solubility profile while maintaining the ability to cure through controlled reactions with external crosslinking agents.
3Reliability
If acid/base catalysts are used for curing, then curability is achieved, but corrosion occurs due to residual acids or bases
Solution Approach 1:
The patent converts the harmful effect of requiring aggressive acid/base catalysts by eliminating the need for them entirely. Instead, the material cures through controlled reactions with isocyanates, epoxies, or other mild crosslinking agents, transforming a harmful curing mechanism into a benign one that produces no corrosive residues.
Solution Approach 2:
The patent introduces intermediary curing agents (isocyanates, epoxies) that mediate the crosslinking process without requiring harsh acid/base catalysts. These intermediaries enable curability while avoiding the corrosive byproducts associated with traditional acid/base-catalyzed condensation.
4Object-affected harmful factors
If hydrocarbon chains co-crystallize, then water repellency is enhanced, but structural complexity increases
Solution Approach 1:
The patent applies local quality by creating regions of co-crystallized hydrocarbon chains within the polymer structure that provide water repellency. These localized crystalline domains are embedded within the broader polymer matrix, providing the desired hydrophobic property without requiring the entire structure to be complex.
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 silsesquioxane polymers and compositions exhibit enhanced water repellency and release properties, ensuring low surface energy release coatings with improved adhesion retention, addressing the limitations of existing silsesquioxane materials by providing a stable and corrosion-resistant solution.
Implementation Method 1
exhibit enhanced water repellency and release properties, ensuring low surface energy release coatings
Implementation Method 2
as demonstrated by the unique co-crystallization of hydrocarbon chains
Data Source
AI summary
A silsesquixane polymer, a composition including such silsesquixane polymer, and an article including such polymer or composition, wherein the composition includes a silsesquioxane polymer and a free siloxane; wherein the silsesquioxane polymer includes a three-dimensional network of Formula (I): wherein: each R1 and R2 is independently a (C1-C4)alkyl; each L1 is independently a single bond, an alkylene, or an alkylene bonded to a group selected from oxy, thio, carbonyl, —NH—, and combinations thereof; each R3 is independently a linear (C14-C100)alkyl; with the proviso that L1 is selected such that each Si atom is directly bonded to an alkylene or an alkyl; m is an integer of at least 2; n is an integer of at least 1; m+n is an integer of at least 10; each oxygen atom at an asterisk (*) is bonded to another Si atom within the three-dimensional network; and the silsesquioxane polymer is a solid at 25° C.