Polyamide-Iodine Compositions for Low-Toxicity Biocidal Surfaces

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Solution Overview

Problem

Polyamide (PA) materials are susceptible to microbial growth, particularly under humid conditions, and existing biocidal solutions like small molecule agents and metal nanoparticles pose health and environmental risks, while antibiotic-resistant bacteria threaten healthcare-associated infections (HAIs).

Innovation Solution

Coextruding polyamide with an iodine source, including elemental iodine and polyvinylpyrrolidone-iodine (PVP-I), to form stable PA-I complexes that exhibit broad-spectrum biocidal activity through homogeneous blending via hot melt extrusion.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If small molecule antibacterial agents are used to make PA biocidal, then biocidal activity is achieved, but health concerns and ecological concerns arise due to leaching and toxicity

Engineering Contradiction:

Improvebiocidal activityVSAvoidhealth concerns and ecological toxicity

Core Design Contradiction:

ReliabilityVSObject-affected harmful factors

Solution Approach 1:

The patent changes the chemical form of iodine from small molecule agents to polymeric iodine complexes. The iodine is incorporated into the PA polymer matrix through complexation, fundamentally altering how the biocidal agent is delivered and retained, thereby eliminating leaching while maintaining biocidal activity

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The patent creates a composite material system where iodine is complexed with polyamide to form a new material with integrated biocidal properties. This composite approach embeds the biocidal function within the polymer structure itself, preventing separation and leaching of the active agent

Inventive Principle:

Principle #40Composite materials

2Reliability

If metal nanoparticles are used to make PA biocidal, then biocidal activity is achieved, but toxicity and environmental concerns arise

Engineering Contradiction:

Improvebiocidal activityVSAvoidtoxicity and environmental impact

Core Design Contradiction:

ReliabilityVSObject-affected harmful factors

Solution Approach 1:

The patent changes the type of biocidal agent from metal nanoparticles to iodine-based polymeric complexes. This fundamental parameter change substitutes a different chemical mechanism for biocidal activity that avoids the toxicity and environmental persistence issues associated with metal nanoparticles

Inventive Principle:

Principle #35Parameter changes

3Ease of operation

If PA is used in medical devices, then patient care is improved, but risk of hospital-acquired infections increases due to microbial growth on PA surfaces

Engineering Contradiction:

Improvepatient care capabilityVSAvoidpathogenic contamination risk

Core Design Contradiction:

Ease of operationVSObject-affected harmful factors

Solution Approach 1:

The patent makes the PA material itself biocidal through incorporation of iodine complexes, enabling the material to actively protect against microbial contamination without requiring external treatments or coatings. The biocidal property is an intrinsic feature of the modified PA, providing self-protection in medical applications

Inventive Principle:

Principle #25Self-service

4Ease of manufacture

If conventional extrusion methods are used to add biocidal agents to PA, then manufacturing is simplified, but homogeneous distribution and stability are compromised

Engineering Contradiction:

Improveextrusion process simplicityVSAvoidhomogeneous blending and complex stability

Core Design Contradiction:

Ease of manufactureVSStability of the object's composition

Solution Approach 1:

The patent merges the biocidal agent (iodine) with the polymer matrix (PA) through complexation during extrusion, creating a unified homogeneous material. The iodine and PA form a stable complex throughout the polymer matrix, ensuring both uniform distribution and long-term stability while maintaining processability through conventional extrusion methods

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 PA-I complexes provide long-term, non-selective biocidal activity against bacteria, viruses, and fungi, with low toxicity and resistance, suitable for medical and consumer applications, and are commercially feasible.

Implementation Method 1

coextruding polyamide with an iodine source, including elemental iodine and polyvinylpyrrolidone-iodine (PVP-I), to form stable PA-I complexes

Methodology Applied

Scientific EffectComplexation: Chemical Bonding

Implementation Method 2

homogeneous blending via hot melt extrusion

Methodology Applied

Scientific EffectMelting: Melting

Implementation Method 3

coextruding polyamide with an iodine source

Methodology Applied

Scientific EffectExtrusion: Extrusion

Data Source

PatentEP3893646B1Biocidal polyamide-compositions, methods for preparing the same and uses thereof

Publication Date: 2026.02.18 X INFEX BV

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AI summary

The invention relates to the field of polymers, in particular to polymer systems based on polyamide (PA) having broad spectrum biocidal activity and the use thereof in the manufacture of biocidal products. The blends are produced by hot melt extrusion. Provided is a.miscible blend of polyamide -iodine (PA-I), preferably comprising at least 0.1 wt% iodine, preferably at least 0.5 wt% iodine. Also provided is a biocidal product comprising a blend according to the invention.