Cationic Polymer Film Coatings for Low-Toxicity Residual Pathogen Kill
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Solution Overview
Problem
There is a need for antimicrobial, antiviral, and antifungal formulations, solutions, films, and coatings that are relatively non-toxic and effective, capable of providing continuous, long-term protection against pathogens on surfaces and skin.
Innovation Solution
The development of cationic polymer-based formulations that form durable, contact-active films, which can inactivate bacteria, viruses, and fungi through charge interaction and membrane disruption, passing EPA 01-1A and PAS2424 durability tests, offering residual protection for days to weeks.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional antimicrobial formulations are used, then antimicrobial activity is achieved, but toxicity to humans and environment increases
Solution Approach 1:
The patent changes the chemical parameters of antimicrobial agents by using cationic polymers with specific charge densities and molecular weights instead of traditional toxic biocides. The polymer structure is modified to achieve effective pathogen interaction while maintaining non-toxicity to human cells and the environment.
Solution Approach 2:
The invention employs composite material design by combining cationic polymer chains with pathogen targets, creating a synergistic system where the polymer matrix delivers antimicrobial action through multiple mechanisms including charge interaction, membrane disruption, and protein denaturation, thereby achieving effective pathogen inactivation with reduced toxicity.
2Duration of action of stationary object
If contact-active films are formed for durable protection, then residual protection is achieved, but film formation complexity increases
Solution Approach 1:
The cationic polymer formulation is designed to self-assemble and self-deposit on surfaces through simple application methods such as spraying or wiping. The polymer automatically forms a durable film without requiring complex manufacturing equipment or multi-step processing, enabling easy implementation while providing long-lasting residual protection.
3Speed
If rapid pathogen inactivation is achieved, then effectiveness is improved, but formulation stability may be compromised
Solution Approach 1:
The patent optimizes polymer parameters including charge density, molecular weight, and hydrophobicity to achieve rapid pathogen inactivation while maintaining formulation stability. The cationic polymer structure is designed to interact quickly with negatively charged pathogens through electrostatic attraction, achieving fast kill rates without compromising the stability of the aqueous formulation.
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 cationic polymer films achieve >log-4 inactivation of bacteria and viruses within minutes, maintaining effectiveness for extended periods, meeting EPA and international durability standards, and reducing microbial transmission in various environments.
Implementation Method 1
inactivate bacteria, viruses, and fungi through charge interaction and membrane disruption
Implementation Method 2
inactivate bacteria, viruses, and fungi through charge interaction and membrane disruption
Data Source
AI summary
The invention comprises a method for treating a pathogen, comprising the steps of: reacting, in a solution, poly(2-alkyl-2-oxazoline) with a strong acid to form a polyalkylenimine and a carboxylic acid, the polyalkylenimine comprising protonated sites; increasing relative concentration of the polyalkylenimine through removal of at least 95% of the carboxylic acid from the solution; adjusting pH of the solution to greater than 2.5; producing a film on a substrate from the solution; contacting first bacteria with the film; and reducing activity of the first bacteria contacting the film by: greater than 9% and less than 99.99995% in less than one minute; greater than 99.999% in less than four days; and greater than 99.99995% in less than seven days.