The patent's assignee for patent number 8524920 is
News editors obtained the following quote from the background information supplied by the inventors: "The following description is provided to assist the understanding of the reader. None of the information provided or references cited is admitted to be prior art to the present technology.
"Demand is increasing worldwide for reliable, efficient, and low-cost air treatment systems in confined spaces. Air contaminants include volatile organic compounds (VOCs), inorganic/organic particulates, and biological particulates such as bacteria, fungi (mold), and various other biological contaminants (including viruses). Many filtration strategies exist for purifying air, yet they suffer from various drawbacks.
"Physical filtration strategies remove most particulates, but have little effect on VOCs. They can also serve as a breeding ground for microorganisms, which compromise the flow rate of air through the filter.
"Electrostatic filtration strategies improve on basic physical filtration without further restricting airflow. However, energy is required to charge the filter. Importantly, electrostatic filtration strategies do not address VOCs and they do not kill bacteria. They can therefore serve as a breeding ground for microorganisms.
"Photochemical filters generally include TiO.sub.2 as an agent to generate singlet oxygen, which can kill microorganisms. While generally effective, and despite the TiO.sub.2 having a long lifetime, the lifetime of the active species of the filter, e.g. the singlet oxygen, is very short. In addition, favorable TiO.sub.2 kinetics are limited to a small number of surfaces.
"Active Chemical filtration is effective, but the lifetime may be too short. In addition, the filter may be expensive and/or burdensome to replace or recharge. Other problems are that the active chemical can be a health hazard (e.g. ozone), and/or very slow kinetics (e.g. peroxymonosulfate)."
As a supplement to the background information on this patent, NewsRx correspondents also obtained the inventors' summary information for this patent: "The present technology provides for a polymer having a pendant dioxirane moiety that is reactive toward microorganisms and VOCs, and is capable of oxidizing those materials to either kill them or render them harmless. This is achieved by configuring the polymer into a filter through which a contaminated fluid, i.e. gas or liquid, may be passed. As the fluid passes through the filter, at least a portion of the contaminant may be oxidized by the pendant dioxirane moiety, thus purifying the fluid and reducing or eliminating the amount of contaminant present in the fluid.
"In one aspect, a polymer includes a pendant dioxirane moiety. In various embodiments, the pendant dioxirane moiety is generally represented by Formula I or Formula II:
"##STR00001## In Formula I, the pendant dioxirane may be part of a side chain extending off the backbone of the polymer. In Formula II, the pendant dioxirane may be part of the backbone of the polymer. In the above Formula I, R.sup.1 may be a bond (i.e. absent), alkylene, perhaloalkylene, cycloalkylene, arylene, heteroarylene, heterocyclylene, amino, carbonyl, carboxyl, alkylcarboxy, carboxyalkyl or alkylcarboxyalkyl; R.sup.2 may be an electron withdrawing group; and R.sup.3 may be a hydrogen, alkyl, perhaloalkyl, cycloalkyl, aryl, heteroaryl, heterocyclyl, amino, carbonyl, carboxyl, alkylcarboxy, carboxyalkyl or alkylcarboxyalkyl.
"In another aspect, a process is provided including providing a first polymer including an oxo group and reacting the oxo group with peroxymonosulfate to form a second polymer including a pendant dioxirane moiety.
"In another aspect, an article is provided including a polymer which includes a pendant dioxirane moiety. In various embodiments, this article is a gas or liquid filter.
"In a further aspect, a method of gas purification is provided including passing gas through a filter including a polymer including a pendant dioxirane moiety and the gas includes a biological contaminant or chemical contaminant. In some embodiments, the gas is air.
"In another aspect, a method of fluid purification is provided including passing a fluid, such a liquid or gas, through a filter, where the filter includes a polymer including a pendant dioxirane moiety and the fluid includes a biological contaminant or chemical contaminant.
"In another aspect, a method is provided including providing a filter including a polymer, the polymer including ketone moieties, and converting the ketone moieties to dioxirane moieties by reacting the polymer with peroxymonosulfate.
"The foregoing summary is illustrative only and is not intended to be in any way limiting. In addition to the illustrative aspects, embodiments and features described above, further aspects, embodiments and features will become apparent by reference to the following drawings and the detailed description."
For additional information on this patent, see: Sjong, Angele;
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