Antibacterial Polymers with Controlled Zinc Ion Release
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current polymers with antibacterial properties, especially those using zinc salts, face issues with zinc ion release exceeding legal limits, posing toxicity concerns and necessitating the development of materials with low toxicity and controlled zinc ion release for applications involving human or animal skin contact.
Innovation Solution
Incorporating zinc PCA, zinc pyrithione, or mixtures thereof into the polymerization process of monomers in an aqueous or organic solvent, ensuring the zinc salts are fully integrated into the polymer structure, thereby controlling zinc ion release and imparting antibacterial properties without exceeding legal limits.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If zinc salts are mixed with polymer to impart antibacterial properties, then antibacterial performance is improved, but zinc ion release exceeds legal limits causing toxicity concerns
Solution Approach 1:
The patent creates a composite material where zinc salts are incorporated into the polymer matrix during polymerization. This composite structure allows the zinc salts to be dispersed within the polymer chains, providing antibacterial properties while controlling ion release through the polymer matrix, thereby reducing toxicity concerns.
Solution Approach 2:
The zinc salts are added to the monomer solution before polymerization occurs. This preliminary incorporation ensures that the zinc salts become an integral part of the polymer structure from the beginning, preventing excessive ion release later and maintaining safety standards while providing持续 antibacterial protection.
2Reliability
If colloidal silver or silver particles are used to impart antiseptic properties, then antibacterial performance is improved, but chronic intoxication called argyria occurs
Solution Approach 1:
The patent changes the chemical form of the antibacterial agent from metallic silver or colloidal silver to zinc salts incorporated in the polymer matrix. This parameter change maintains the antibacterial effectiveness while eliminating the harmful chronic intoxication effect associated with silver, as zinc is an essential element with different toxicity profile.
3Reliability
If copper or nickel are used to provide antimicrobial properties, then antibacterial performance is improved, but legislative restrictions are imposed due to high toxicity
Solution Approach 1:
The patent changes the metallic antimicrobial agent (copper or nickel) to zinc-based compounds. Zinc is less toxic than copper or nickel and does not carry the same legislative restrictions, while maintaining effective antibacterial properties through zinc ion release from the polymer matrix.
4Reliability
If zinc salts are mixed with polymer, then antibacterial properties are imparted, but metal ion release exceeds migration limits over time
Solution Approach 1:
By creating a composite material where zinc salts are incorporated into the polymer matrix during polymerization, the patent achieves controlled release of zinc ions. The polymer matrix acts as a reservoir that releases zinc ions gradually and controllably, maintaining antibacterial properties while staying within migration limits.
Solution Approach 2:
The zinc salts are incorporated into the polymer structure during the polymerization process itself, rather than being added later. This preliminary incorporation ensures uniform distribution and controlled release kinetics, preventing excessive ion release over time while maintaining manufacturing precision.
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 resulting antibacterial polymers effectively inhibit microbial proliferation, with zinc ion release below legal limits, ensuring safety and efficacy in products like computer mice, keyboards, and door handles, while maintaining optimal antibacterial performance against various bacterial strains.
Implementation Method 1
adding at least one zinc salt selected among zinc PCA, zinc pyrithione or mixtures thereof to a solution or dispersion, in an aqueous and/or organic solvent, of the monomers used to synthesize the polymer by means of a polymerization reaction
Implementation Method 2
zinc ions in fact possess bacteriostatic properties, i.e. they inhibit the bacterial growth because they are able to penetrate into bacterial cells, blocking different biological processes that are fundamental for the survival of the bacteria themselves
Data Source
AI summary
The invention relates to polymers selected from among polypropylene (PP), polycarbonate (PC), acrylonitrile- butadiene-styrene (ABS), polyvinylchloride (PVC) and polyethylene terephthalate (PET), nylon and polystyrene, having antibacterial properties, wherein the antibacterial effect is obtained by adding a zinc salt selected from among: zinc PCA, zinc oxide, zinc hydroxide, zinc pyrrolidone or zinc pyrithione during the process of polymerization of the monomers. The antibacterial polymers are used to prepare products intended to enter into contact with the skin.