Removable Adhesive Composition with Reactive Silyl Groups
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Solution Overview
Problem
Existing adhesives and sealants struggle with removability without damaging substrates, often requiring specialized tools and leaving residues, while also lacking adequate mechanical properties on various substrates.
Innovation Solution
A curable composition comprising a (meth)acrylate ester polymer with reactive silyl groups, tertiary aminosilane, fumed silica, and a curing catalyst, which provides balanced adhesion and cohesion for easy and clean removal without substrate damage, while maintaining good mechanical properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If silane-modified polymer formulations are used to achieve good long-term adhesion properties, then adhesion strength is improved, but removability deteriorates as they can hardly be removed without damaging substrates or leaving substantial residues
Solution Approach 1:
The patent changes the chemical composition parameters by using polyether polyols with specific molecular weights (500-500,000 g/mol) and incorporating silane-modified polymers with controlled silane content (1-20 mmol/g). This parameter optimization enables the adhesive to achieve strong bond strength while maintaining removability without substrate damage or excessive residues.
Solution Approach 2:
The invention creates a composite adhesive system combining polyether polyols, silane-modified polymers, and specific additives in controlled proportions. This composite formulation integrates the benefits of strong adhesion from silane-modified polymers with the removability characteristics of polyether-based systems, resolving the contradiction between durability and ease of removal.
2Strength
If conventional adhesives are used to ensure adequate mechanical properties on substrates, then adhesion performance is improved, but removability deteriorates requiring specialized tools and leaving residues
Solution Approach 1:
The patent optimizes compositional parameters including polyether polyol molecular weight (500-500,000 g/mol), silane modification level (1-20 mmol/g), and additive concentrations to achieve a formulation that provides adequate mechanical properties while enabling simple removal without specialized tools or excessive residues.
3Strength
If adhesive formulations are designed for strong bonding to achieve adequate initial grab and final adhesion, then mechanical strength is improved, but clean removability deteriorates
Solution Approach 1:
The invention carefully controls the parameters of silane-modified polymer content (1-20 mmol/g) and polyether polyol molecular weight to achieve optimal balance between bond strength and residue formation. This parameter optimization enables strong bonding while minimizing adhesive residues that would require cleaning.
Solution Approach 2:
The adhesive formulation is designed to be intentionally temporary, allowing for easy removal and clean surfaces. The controlled composition ensures the adhesive performs its bonding function adequately but can be removed without leaving substantial residues, making it suitable for applications where clean removal is prioritized.
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 allows for easy and clean removal of the cured product from substrates without damage, while ensuring adequate mechanical properties, thus addressing the limitations of existing adhesives and sealants.
Implementation Method 1
the curable compositions of the invention are easily removable without damaging substrates after they are cured... comprising at least one poly(meth)acrylate ester polymer containing at least one reactive silyl group... at least one curing catalyst
Implementation Method 2
at least one tertiary aminosilane... at least one curing catalyst
Implementation Method 3
at least one fumed silica... show adequate mechanical properties
Data Source
AI summary
Curable compositions comprising at least one poly(meth)acrylate ester polymer containing at least one reactive silyl group, at least one tertiary aminosilane, at least one fumed silica, and at least one curing catalyst; a process for preparing removable adhesive, use of the curable composition, and adhesive, sealant, and/or coating materials comprising the curable composition are provided.