Biostatic Polymer Articles via Biocide-PVA Complex
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Solution Overview
Problem
Existing surface disinfectants are not durable enough to maintain a biostatic or biocidal effect for long periods, making it impractical to prevent microbial growth on surfaces, especially in high-risk environments like hospitals, and previous attempts to incorporate disinfectants into solid articles have been ineffective, toxic, or expensive.
Innovation Solution
A composition of polyvinyl alcohol combined with a biocide, such as a quaternary ammonium compound, which forms a complex and acts as a plasticizer, creating a surface that remains biostatic or biocidal for extended periods by preventing leaching through hydrogen bonding, even when exposed to running water.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If disinfectants are applied to surfaces for disinfection, then microbial growth is prevented, but the disinfectant effect is not durable and requires frequent re-application
Solution Approach 1:
The biocide is incorporated into the polymer composition during manufacturing, performing the disinfection function in advance and continuously without requiring repeated applications. The composition is formulated to release biocide slowly over time, establishing prolonged protective action before microbial contamination can occur.
Solution Approach 2:
The polymer article itself provides the disinfection function through embedded biocide, making the surface self-disinfecting without requiring external intervention. The biocide is released continuously from the polymer matrix, allowing the article to maintain its own biostatic properties autonomously.
2Duration of action of moving object
If disinfectants are incorporated into solid articles for slow release, then duration of action is extended, but effectiveness is reduced or toxicity increases
Solution Approach 1:
The biocide concentration in the polymer composition is optimized to maintain effective disinfection levels over extended periods. The formulation adjusts biocide loading, polymer matrix structure, and release kinetics to balance prolonged duration with sustained effectiveness, avoiding both under-dosing and excessive toxicity.
3Reliability
If regular cleaning with disinfectant solutions is performed, then microbial growth is controlled, but it is not practical to wipe surfaces sufficiently often
Solution Approach 1:
The polymer article provides continuous biostatic protection through embedded biocide release, eliminating the need for manual cleaning operations. The surface maintains its antimicrobial properties autonomously, making microbial growth control practical without requiring frequent human intervention.
4Reliability
If biocide is incorporated into polymer composition, then biostatic surface is achieved, but biocide may leach from the surface
Solution Approach 1:
The polymer composition is formulated as a composite system where the biocide is embedded within the polymer matrix. The polymer structure provides physical containment while allowing controlled release, and chemical interactions between biocide and polymer reduce leaching. This composite approach maintains biostatic surface properties while minimizing biocide loss.
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 effectively prevents microbial colony growth on surfaces for weeks, months, or even years, maintaining biostatic or biocidal properties, and can be used to form articles that resist microbial growth without the need for frequent re-disinfection.
Implementation Method 1
It is believed that a complex formed by hydrogen bonding between the biocide and the polyvinyl alcohol prevents or inhibits leaching of biocide from the surface of the article.
Implementation Method 2
said combination having been heated to above its melting point
Data Source
AI summary
Compositions comprising a polyvinyl alcohol in combination with a biocide which is a plasticizer, such as a quaternary ammonium compound, or in combination with a biocide and a compatible plasticizer, and wherein the biocide forms a complex with the polyvinyl alcohol, said combination having been heated to above its melting point, said composition having a surface which remains biostatic or biocidal for at least 7 days. A hot melt of the composition may be cast or applied as a film or coating or may be extruded molded or otherwise into articles. Volatiles formed during heating may be removed from the combination e.g. by low pressure.