Covalently Bonded Antimicrobial Copolymers for Wash-Durable Textiles

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Solution Overview

Problem

Current antimicrobial textile finishes face issues such as loss of effectiveness after laundry washes, development of resistant microbial strains, and cytotoxicity, as well as residual chlorine odor from reactivation methods, necessitating alternative solutions for stable and durable antimicrobial solutions.

Innovation Solution

Development of sulfated quaternary polyethylenimine (PEI) copolymers covalently bonded to textile articles, which are synthesized by deacylation of poly(2-ethyl-2-oxazoline) and quaternization with pendant groups, forming stable and durable antimicrobial finishes effective against both Gram-positive and Gram-negative bacteria.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If leachable type of antimicrobial agents are used, then initial antimicrobial effectiveness is achieved, but effectiveness is lost after laundry washes

Engineering Contradiction:

Improveantimicrobial effectivenessVSAvoidduration of antimicrobial activity

Core Design Contradiction:

ReliabilityVSDuration of action of stationary object

Solution Approach 1:

The patent applies preliminary action by covalently bonding the antimicrobial copolymer to the textile fiber during the finishing process. This pre-attachment ensures the antimicrobial agent remains permanently fixed to the fabric, preventing leaching during laundry washes and maintaining effectiveness over extended periods.

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The patent uses a copolymer structure as an intermediary, combining a polyethylenimine backbone with hydrophobic side chains. This molecular intermediary allows covalent bonding to the fiber while presenting antimicrobial functionality, solving both the attachment and effectiveness problems simultaneously.

Inventive Principle:

Principle #24Intermediary (Mediator)

2Reliability

If leachable antimicrobial agents are used, then initial antimicrobial protection is provided, but cytotoxicity and microbial resistance develop

Engineering Contradiction:

Improveantimicrobial protectionVSAvoidcytotoxicity and microbial resistance

Core Design Contradiction:

ReliabilityVSObject-affected harmful factors

Solution Approach 1:

The patent changes the fundamental parameter of agent delivery from leachable to covalently bonded. This parameter change transforms the interaction mechanism from continuous release (causing toxicity and resistance) to contact-based killing, eliminating the harmful effects while maintaining protection.

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The patent replaces the chemical release mechanism with a physical covalent bonding system. Instead of relying on chemical dissolution and diffusion of antimicrobial agents, the system uses stable covalent bonds to anchor the copolymer, fundamentally changing how antimicrobial action is delivered.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

3Reliability

If regeneration principle with chlorine bleach is used, then antimicrobial activity is reactivated, but residual chlorine odor remains

Engineering Contradiction:

Improveantimicrobial activityVSAvoidresidual chlorine odor

Core Design Contradiction:

ReliabilityVSObject-generated harmful factors

Solution Approach 1:

The patent extracts the need for reactivation steps by incorporating permanent covalent bonding directly into the finishing process. This eliminates the requirement for subsequent chlorine bleach treatment, removing the source of residual chlorine odor while maintaining antimicrobial activity.

Inventive Principle:

Principle #2Taking out (Extraction)

4Reliability

If inert physical barrier coating is used, then microbial contact killing is achieved, but durability and stability are insufficient

Engineering Contradiction:

Improvemicrobial contact killingVSAvoiddurability of finish

Core Design Contradiction:

ReliabilityVSStability of the object's composition

Solution Approach 1:

The patent merges the barrier function with covalent bonding by integrating the copolymer structure directly into the fiber matrix through chemical bonds. This combination maintains the physical barrier capability while adding the stability of chemical attachment, solving both durability and functionality requirements.

Inventive Principle:

Principle #5Merging (Combining)

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 sulfated quaternary PEI copolymers provide long-lasting antibacterial activity without leaching, effective against a broad range of bacteria, including S. aureus and E. coli, and maintain effectiveness even after sonication, ensuring durability and safety without residual odors.

Implementation Method 1

reacting the sulfated quaternary PEI copolymer with the textile article to produce covalent bonds between the sulfated quaternary PEI copolymer and the textile article

Methodology Applied

Scientific EffectCovalent bonding: Chemical Bonding

Data Source

PatentUS8876914B2Synthesis and application reactive antimicrobial copolymers for textile fibers

Publication Date: 2014.11.04 UNIVERSITY OF GEORGIA RESEARCH FOUNDATION INC

AI summary

Embodiments of the present disclosure provide polymer compositions, methods of making polymer compositions, structures (e.g., textile articles) having the polymer composition covalently bonded to the structure, methods of attaching the polymer to the surface of the structure, methods of decreasing the amount of microorganisms formed on a structure, and the like.