Cationic Polymer Antimicrobial Film Formulation
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Solution Overview
Problem
Current antimicrobial and antiviral formulations, solutions, and coatings are often toxic and lack long-term effectiveness in inactivating pathogens on surfaces and skin.
Innovation Solution
Development of cationic polymer-based formulations with tuned cationic charge and counterions that form durable, non-toxic antimicrobial films capable of inactivating pathogens, providing residual protection by creating a continuous killing action against bacteria, viruses, and fungi.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional antimicrobial formulations are used, then pathogen inactivation 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, replacing conventional toxic biocides. The polymer formulations are tuned to achieve effective pathogen inactivation through electrostatic interactions while maintaining safety profiles, thus resolving the contradiction between effectiveness and toxicity.
Solution Approach 2:
The patent employs composite polymer formulations combining cationic polymers with specific functional groups and molecular structures. These composite materials provide both antimicrobial activity and safety, achieving effective pathogen inactivation without the toxicity associated with conventional chemical biocides.
2Reliability
If conventional antimicrobial coatings are applied, then initial pathogen inactivation is achieved, but long-term residual protection is insufficient
Solution Approach 1:
The patent designs polymer formulations that provide continuous antimicrobial action over time. The cationic polymers maintain their activity on surfaces, providing sustained residual protection against pathogens rather than requiring reapplication, thus achieving both initial inactivation and long-term durability.
Solution Approach 2:
Instead of using volatile chemical biocides that evaporate or degrade, the patent inverts the approach by using non-volatile cationic polymers that persist on surfaces. This inversion of the conventional approach enables long-term residual protection while maintaining initial effectiveness.
3Object-affected harmful factors
If cationic polymer formulations are developed, then non-toxicity and long-term effectiveness are achieved, but formulation complexity increases
Solution Approach 1:
The patent systematically adjusts polymer parameters such as charge density, molecular weight, and functional group composition to optimize the balance between non-toxicity and effectiveness. By tuning these parameters, the formulation achieves desired performance while managing complexity through structured design approaches.
4Reliability
If cationic charge is increased in polymer formulations, then antimicrobial activity is enhanced, but potential toxicity and formulation stability issues arise
Solution Approach 1:
The patent optimizes the cationic charge parameter by controlling polymer structure and composition to achieve effective antimicrobial activity. The charge density is carefully tuned to maintain biological activity while avoiding excessive toxicity, resolving the contradiction between activity enhancement and safety.
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 technology achieves >log-4 inactivation of microbial populations, passing EPA 01-1A and PAS2424 durability tests, offering long-term protection against a wide range of pathogens without toxicity, suitable for various applications including healthcare and consumer products.
Implementation Method 1
form durable, non-toxic antimicrobial films
Implementation Method 2
cationic polymer-based formulations with tuned cationic charge... inactivating pathogens... >log-4 inactivation of microbial populations
Data Source
AI summary
A method for inactivating pathogens is described, comprising the steps of: (1) preparing a copolymer comprising repeating units, the repeating units comprising at least two of: first monomers comprising a —NH2+CH2CH2— group; second monomers comprising a —NHCH2CH2— group; and third monomers comprising an acyl group, —C(═O)—R′, attached to a nitrogen in a polymer backbone group of the copolymer comprising —NCH2CH2—, wherein R′ comprises a hydrocarbon chain, the repeating units arranged in any order in the copolymer; (2) preparing a formulation, the formulation comprising the copolymer and a total cationic charge in a range of 0.2 to 10 C/cm3, the total cationic charge at least 95% offset by counteranions in the formulation; and (3) inactivating at least ninety percent of the pathogen within a time period of less than ninety minutes from contact of the pathogen with the copolymer.