Crosslinked Poly(meth)acrylate Adhesive for Wet Surface Bonding
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Methacrylate pressure-sensitive adhesives are generally unsuitable for use on wet or moist surfaces due to their hydrophobic nature, lacking the necessary wet-stick properties for effective adhesion.
Innovation Solution
Crosslinking a pre-adhesive composition of poly(meth)acrylate macromolecules with a number-average molecular weight between 25,000 and 200,000 to create a pressure-sensitive adhesive with enhanced wet-stick properties, characterized by a storage modulus of up to 10,000 Pa and a glass transition temperature below -20°C, allowing for effective adhesion to wet surfaces.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If (meth)acrylate pressure-sensitive adhesives are used, then optical clarity and oxidative resistance are achieved, but adhesion to wet or moist surfaces deteriorates due to hydrophobic nature
Solution Approach 1:
The patent changes the molecular weight parameter of poly(meth)acrylate macromolecules to a specific range (25,000-200,000) and controls glass transition temperature (below -20°C) and storage modulus (up to 10,000 Pa) to achieve wet-stick properties while maintaining optical clarity and oxidative resistance of (meth)acrylate adhesives
Solution Approach 2:
The patent creates a composite adhesive system combining poly(meth)acrylate macromolecules with specific molecular weight characteristics and crosslinking agents, forming a network structure that provides both wet-stick adhesion and the inherent benefits of (meth)acrylate polymers
2Reliability
If crosslinking is applied to enhance wet-stick properties, then adhesion to wet surfaces improves, but adhesive composition complexity increases
Solution Approach 1:
The patent optimizes the molecular weight parameter (25,000-200,000) and glass transition temperature (below -20°C) of poly(meth)acrylate macromolecules to achieve wet-stick properties through controlled polymer chain flexibility and intermolecular interactions, rather than complex crosslinking mechanisms
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 resulting adhesive exhibits a Peak Pull Force of at least 2000 g in the Wet-Stick Test, demonstrating excellent wet-stick properties without the need for polar components, and provides gentle release from skin while minimizing gas leakage in negative pressure wound therapy applications.
Implementation Method 1
pressure-sensitive adhesives obtained from crosslinking a pre-adhesive composition comprising poly(meth)acrylate macromolecules that comprise a number-average molecular weight of from about 25000 to about 200000
Implementation Method 2
many such (meth)acrylate polymers are hydrophobic in nature and, without modification, have been generally considered to be unsuitable as 'wet-stick' adhesives
Implementation Method 3
the pre-adhesive composition exhibits a Tg of less than about minus 20° C. and exhibits a storage modulus of from about 4 Pa to about 10000 Pa at 25° C.
Data Source
AI summary
Negative pressure wound dressings comprising pressure-sensitive adhesives with enhanced adhesion to wet surfaces, obtained from crosslinking a pre-adhesive composition comprising poly(meth)acrylate macromolecules that comprise a number-average molecular weight of from about 25000 to about 200000, and methods of using such dressings.