Elastomeric Antimicrobial Coating for Medical Gloves
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Solution Overview
Problem
Antimicrobial gloves face challenges in maintaining efficacy due to moisture absorption, which causes antimicrobial agents to migrate into the glove substrate, reducing their surface availability and effectiveness, especially in warm and humid environments.
Innovation Solution
A water-based coating formulation with a controlled-release matrix comprising a hydrophilic polymer and a hydrophobic component, such as Eudragit RS 30D and paraffin wax, is applied to the glove surface, providing a flexible film that retains antimicrobial agents like chlorhexidine digluconate and benzalkonium chloride, preventing migration and ensuring sustained activity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a water-based coating formulation with controlled-release matrix is applied to the glove surface, then antimicrobial agent retention and sustained activity are improved, but device complexity and manufacturing complexity increase
Solution Approach 1:
The patent applies composite materials by formulating a coating that combines hydrophilic polymers (for antimicrobial agent compatibility and reservoir formation) with hydrophobic components (for moisture resistance and controlled release). This composite structure prevents antimicrobial agent migration into the glove substrate while maintaining sustained activity, directly resolving the contradiction between reliability improvement and complexity increase by integrating multiple functional materials into a single coating system.
Solution Approach 2:
The patent employs parameter changes by modifying the coating formulation to include specific ratios of hydrophilic to hydrophobic components, controlling the release kinetics of antimicrobial agents. By adjusting parameters such as polymer molecular weight, hydrophobicity, and crosslinking density, the coating achieves optimal balance between agent retention and controlled release, thereby improving reliability without excessive complexity.
2Ease of manufacture
If antimicrobial agents are coated on the glove surface without a controlled-release matrix, then manufacturing simplicity is maintained, but antimicrobial agent migration into the glove substrate occurs, reducing surface availability and efficacy
Solution Approach 1:
The controlled-release matrix acts as an intermediary layer between the antimicrobial agents and the glove substrate. This matrix prevents direct contact and migration of antimicrobial agents into the glove while still allowing controlled release to the surface. The intermediary structure maintains manufacturing simplicity by applying as a single coating layer while internally preventing agent loss, thus resolving the contradiction between ease of manufacture and reliability.
3Reliability
If starch powders or powder coatings are used to localize and fix antimicrobial agents on the glove surface, then antimicrobial agent retention is improved, but powder residue remains on the glove surface
Solution Approach 1:
The patent replaces powder-based fixation systems with a flexible polymer coating film that encapsulates antimicrobial agents. This thin film structure provides continuous coverage without powder residue, while the hydrophilic-hydrophobic composite matrix within the film maintains agent retention. The flexible film conformally coats the glove surface, eliminating the harmful powder residue effect while preserving reliability.
4Reliability
If the glove surface is treated with antimicrobial agents in warm and humid storage environments, then initial antimicrobial activity is achieved, but moisture absorption accelerates agent migration into the glove body, reducing surface availability
Solution Approach 1:
The controlled-release matrix provides preliminary anti-action by pre-establishing a moisture-resistant barrier before storage. This barrier prevents moisture from penetrating to the antimicrobial agents during warm and humid storage, thereby preventing accelerated migration into the glove body. The matrix maintains surface availability throughout storage, resolving the contradiction between initial activity and duration by proactively preventing moisture-induced degradation.
Solution Approach 2:
The hydrophobic components in the coating formulation provide beforehand cushioning against moisture absorption during storage. This cushioning effect buffers the antimicrobial agents from moisture exposure, preventing premature migration and maintaining surface availability. The prior cushioning protects against the harmful effects of warm and humid storage conditions, ensuring both initial and sustained antimicrobial activity.
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 coating formulation maintains broad-spectrum antimicrobial activity for an extended period, providing a quick-kill effect against microorganisms like Staphylococcus aureus and Escherichia coli, even after storage and exposure to humid conditions, with improved retention of antimicrobial agents on the surface.
Implementation Method 1
a controlled-release matrix comprising a blend of a hydrophilic polymer and a hydrophobic component
Implementation Method 2
preventing migration and ensuring sustained activity... even after storage and exposure to humid conditions
Implementation Method 3
A water-based coating formulation with a controlled-release matrix comprising a hydrophilic polymer and a hydrophobic component... providing a flexible film that retains antimicrobial agents
Implementation Method 4
allows the articles to maintain a high efficacy of antimicrobial activity... exhibit good 'time-kill' activity against a broad spectrum of microorganisms
Data Source
AI summary
A first aspect of the present invention is directed to a surface treatment for elastomeric articles such as medical gloves, comprising a water-based coating formulation and antimicrobial agent(s) embraced therein in an essentially powder-free composition coating. A second aspect of the present invention is directed to a water-based coating formulation for elastomeric articles such as gloves comprising at least one non-volatile water-soluble antimicrobial agent in a controlled-release matrix comprising a blend of a hydrophilic polymer and a hydrophobic component. The controlled-release matrix/blend requirements include: compatibility with the antimicrobial agent, formation of a reservoir of antimicrobial agent, coating film flexibility and lower water-solubility than the antimicrobial agent. A third aspect of the present invention is directed to a method for treating medical gloves comprising dipping, spraying, tumbling or other means for applying to the glove surface a composition to provide medical gloves with sustainable antimicrobial activity.