Silylated Polyurethane Adhesive Solvent Resistance
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Solution Overview
Problem
Existing pressure-sensitive adhesives lack solvent resistance, which is essential for applications in automotive, aerospace, industrial, and laboratory settings where exposure to solvents and oils is common, leading to loss of adhesive properties and critical information.
Innovation Solution
A laminate comprising a backing material with a cured silylated polyurethane prepolymer derived from the reaction of polyester polyols with polyisocyanates, possessing an average of at least 2.05 hydroxyl groups per molecule, providing improved adhesive and cohesive properties and solvent resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional pressure-sensitive adhesives are used, then adhesive properties are achieved, but solvent resistance is insufficient
Solution Approach 1:
The patent modifies the chemical composition parameters of the adhesive by incorporating silylated polyurethane prepolymers with specific hydroxyl group content (at least 2.05 hydroxyl groups per molecule) and controlled molecular weight (1000-5000 g/mol). This parameter change transforms the adhesive from being solvent-sensitive to solvent-resistant while maintaining bonding properties.
Solution Approach 2:
The patent creates a composite adhesive system combining silylated polyurethane prepolymers with traditional adhesive components. The silylated polyurethane forms a crosslinked network structure that provides solvent resistance, while the composite nature maintains adhesion to substrates. This composite approach resolves the contradiction between solvent resistance and adhesive property retention.
2Strength
If adhesive compositions are formulated for good adhesion, then bonding strength is improved, but solvent resistance deteriorates
Solution Approach 1:
The silylated polyurethane acts as an intermediary material that bridges the substrate and the adhesive matrix. Its silane groups form crosslinks that provide chemical stability in solvents, while its polyol structure maintains flexibility and bonding capability. This intermediary role allows the adhesive to simultaneously achieve strong bonding and chemical stability.
Solution Approach 2:
By controlling the hydroxyl group content (at least 2.05 per molecule) and molecular weight (1000-5000 g/mol) of the silylated polyurethane, the patent optimizes the balance between adhesive strength and solvent resistance. These parameter changes ensure the adhesive forms strong bonds while maintaining structural integrity in solvent environments.
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 silylated polyurethane adhesive composition exhibits enhanced solvent resistance, maintaining adhesive properties and integrity in the presence of aromatic and aliphatic solvents, oils, and other chemicals, suitable for diverse industrial and laboratory applications.
Implementation Method 1
a cured silylated polyurethane prepolymer derived from the reaction of at least one polyester polyol with at least one polyisocyanate
Implementation Method 2
silylated polyurethane adhesive composition exhibits enhanced solvent resistance
Implementation Method 3
cured silylated polyurethane prepolymer derived from the reaction of at least one polyester polyol with at least one polyisocyanate
Implementation Method 4
maintaining adhesive properties and integrity in the presence of aromatic and aliphatic solvents
Data Source
AI summary
A laminate includes a backing material coated with an adhesive composition. The adhesive composition includes a cured silylated polyurethane composition derived from polyester based polyurethane prepolymer. The silylated polyurethane composition when partially silylated is especially useful for pressure sensitive adhesives where it imparts superior adhesive and cohesive performance thereto.