Covalent Hydrogel Bonding to Polymeric Substrates
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Solution Overview
Problem
Hydrogels used in wound care often lack durable adhesion to polymeric substrates, especially polyolefins, polyurethanes, and polyesters, due to the inert nature of these surfaces, which can lead to detachment when exposed to wound exudate.
Innovation Solution
A multilayer article comprising a polymeric substrate with a hydrogel coating covalently bonded to it, where the hydrogel is derived from an aqueous composition containing a hydrophilic monomer, water-swellable clay, Type I and Type II photoinitiators, and an acid, with a pH less than 9.5, ensuring durable attachment even after absorbing exudate.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If adhesive is used to attach hydrogel to polymeric substrate, then initial adhesion is achieved, but adhesion is lost after hydrogel absorbs water
Solution Approach 1:
The patent replaces mechanical/adhesive bonding with covalent chemical bonding. The hydrogel is covalently bonded to the polymeric substrate through chemical crosslinking, creating a durable attachment that persists even when the hydrogel absorbs water and swells. This chemical bond substitution eliminates the adhesion loss problem associated with water absorption.
Solution Approach 2:
The patent creates a composite structure where the hydrogel is chemically integrated with the polymeric substrate through covalent bonds. This composite approach combines the hydrophilic, water-absorbing properties of the hydrogel with the structural stability of the polymeric substrate, ensuring the attachment remains intact during water absorption.
2Reliability
If adhesive layers or netting are used to secure hydrogel, then attachment is achieved, but device complexity increases
Solution Approach 1:
The patent merges the hydrogel and polymeric substrate into a single integrated structure through covalent bonding. Instead of using separate adhesive layers or netting components, the hydrogel is chemically bonded directly to the substrate, creating a unified, multi-layer-free structure that maintains attachment security while reducing overall device complexity.
Solution Approach 2:
The patent removes unnecessary intermediate components such as adhesive layers and netting from the structure. By directly covalently bonding the hydrogel to the polymeric substrate, the invention extracts and eliminates these additional layers, simplifying the overall device architecture while maintaining reliable attachment.
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 solution provides a hydrogel coating that remains securely attached to polymeric substrates, maintaining its adhesive properties even after absorbing fluids, thereby enhancing wound care by maintaining a moist environment without detachment.
Implementation Method 1
a first initiator, wherein the first initiator is water-soluble and is a Type I photoinitiator
Implementation Method 2
a second initiator, wherein the initiator is water-soluble and is a Type II photoinitiator
Implementation Method 3
curing the aqueous composition
Implementation Method 4
at least 0.1 wt % of a water-swellable clay
Data Source
AI summary
Described herein is a multilayer article comprising: a. a polymer substrate comprising an abstractable atom; and b. a hydrogel coating thereon wherein the hydrogel coating has a water content of at least 10 wt % and is covalently bonded to the polymer substrate, and wherein the hydrogel coating is derived from an aqueous composition having a pH less than 9.5, the aqueous composition comprising: (a) a hydrophilic monomer selected from at least one of (meth)acrylate or (meth)acrylamide; (b) at least 0.1 wt % of a water-swellable clay; (c) a first initiator, wherein the first initiator is water-soluble and is a Type I photoinitiator; and (d) a second initiator, wherein the initiator is water-soluble and is a Type II photoinitiator; and (e) an acid.