Antimicrobial Polymer Concentrates Surface Migration
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing antimicrobial plastic articles face challenges in achieving desired efficacy due to regulatory restrictions on antimicrobial ingredient usage and difficulty in effectively inhibiting both gram-positive and gram-negative bacteria, particularly in achieving at least a log 2 antimicrobial efficacy.
Innovation Solution
Incorporating a migratory assisting agent into antimicrobial masterbatches that carries antimicrobial agents to the surface of plastic articles, enhancing both initial and sustained antimicrobial effectiveness by improving the distribution and concentration of antimicrobial agents at the surface.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If regulatory restrictions on antimicrobial ingredient usage are followed, then safety and compliance are improved, but antimicrobial efficacy deteriorates
Solution Approach 1:
The patent applies local quality by concentrating the antimicrobial agent at the surface of the polymer article rather than uniformly distributing it throughout the bulk material. The migratory assisting agent facilitates this localized concentration at the surface, enabling high antimicrobial efficacy where needed while keeping the overall concentration of antimicrobial ingredients low to meet regulatory requirements.
Solution Approach 2:
The migratory assisting agent serves as an intermediary substance that carries the antimicrobial agent from the polymer matrix to the surface. This mediator enables the antimicrobial agent to reach its effective location without requiring high overall concentrations, thus resolving the contradiction between compliance and efficacy.
2Quantity of substance
If antimicrobial agents are restricted to low concentrations, then regulatory compliance is improved, but ability to inhibit both gram-positive and gram-negative bacteria deteriorates
Solution Approach 1:
The invention achieves broad-spectrum bacterial inhibition at low concentrations by localizing the antimicrobial agent at the surface through the migratory assisting agent. This surface concentration strategy enables effective inhibition of both gram-positive and gram-negative bacteria while maintaining low overall ingredient levels for regulatory compliance.
3Ease of manufacture
If antimicrobial agents are uniformly distributed in the polymer, then manufacturing simplicity is improved, but surface antimicrobial performance deteriorates
Solution Approach 1:
The migratory assisting agent acts as a mediator that simplifies manufacturing by being mixed uniformly with the polymer and antimicrobial agent, yet subsequently directs the antimicrobial agent to the surface during processing and use. This approach maintains manufacturing simplicity while achieving superior surface performance.
Solution Approach 2:
The migratory assisting agent is pre-incorporated into the polymer matrix during manufacturing, establishing a mechanism that will automatically transport the antimicrobial agent to the surface later. This preliminary action during manufacturing enables subsequent surface localization without adding complex post-processing steps.
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 use of migratory assisting agents in antimicrobial masterbatches significantly improves the antimicrobial efficacy of plastic articles, achieving enhanced log reductions for both gram-positive and gram-negative bacteria, often with reduced amounts of antimicrobial agents, as demonstrated by the JIS Z 2801 test method.
Implementation Method 1
the migratory assisting agent transfers or 'migrates' to the surface of the polymer compound or article. As a result, antimicrobial agents are brought to the surface
Data Source
AI summary
Migratory assisting agents are used to improve antimicrobial efficacy of antimicrobial masterbatches, the polymer compounds these antimicrobial masterbatches are let down into, and the articles made therefrom. The migratory assisting agents function by carrying the antimicrobial agents while the migratory assisting agent transfers or “migrates” to the surface of a polymer compound or article formed from the polymer compound. As a result, antimicrobial agents are brought to the surface where there is exposure to bacterial contamination.