ITMI20101906A1 - NON-HARMFUL COATING ACTIVE AGAINST MICRO-ORGANISMS - Google Patents
NON-HARMFUL COATING ACTIVE AGAINST MICRO-ORGANISMS Download PDFInfo
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- ITMI20101906A1 ITMI20101906A1 IT001906A ITMI20101906A ITMI20101906A1 IT MI20101906 A1 ITMI20101906 A1 IT MI20101906A1 IT 001906 A IT001906 A IT 001906A IT MI20101906 A ITMI20101906 A IT MI20101906A IT MI20101906 A1 ITMI20101906 A1 IT MI20101906A1
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- YDOIFHVUBCIUHF-UHFFFAOYSA-N 9,11,13,16,18,20-hexahydroxy-5,24-dimethyloctacyclo[13.11.1.12,10.03,8.04,25.019,27.021,26.014,28]octacosa-1(26),2,4(25),5,8,10,12,14(28),15(27),16,18,20,23-tridecaene-7,22-dione Chemical compound OC1=CC(O)=C2C(O)=C3C(=O)C=C(C)C4=C5C(C)=CC(=O)C6=C(O)C7=C(O)C=C(O)C8=C7C(=C56)C(=C34)C2=C18 YDOIFHVUBCIUHF-UHFFFAOYSA-N 0.000 description 1
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Classifications
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D5/00—Coating compositions, e.g. paints, varnishes or lacquers, characterised by their physical nature or the effects produced; Filling pastes
Landscapes
- Chemical & Material Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Wood Science & Technology (AREA)
- Organic Chemistry (AREA)
- Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)
Description
Descrizione Description
Stato dell’arte State of the art
E’ ben noto che i rivestimenti e le vernici all’acqua, specie allo stato liquido in cui sono preparate, trasportate e conservate, sono buoni terreni di coltura e proliferazione per microorganismi come batteri e muffe. Tali microorganismi sono attualmente controllati usando una serie di biocidi, come la formaldeide e sostanze che rilasciano formaldeide, tioazoli, isotiazoloni, cyclosan e cosi via. Tali biocidi hanno numerosi svantaggi. Infatti, alcuni sono tossici e soggetti a stretti limiti di legge e, pertanto, possono essere usati solo in quantità limitate. Inoltre, essi hanno la tendenza a essudare dal rivestimento dopo che questo à ̈ seccato in uno strato sottile, come dovrebbe quando usato correttamente, finendo nell’ambiente circostante. It is well known that water-based coatings and paints, especially in the liquid state in which they are prepared, transported and stored, are good culture and proliferation grounds for microorganisms such as bacteria and molds. Such microorganisms are currently controlled using a number of biocides, such as formaldehyde and substances that release formaldehyde, thioazoles, isothiazolones, cyclosan and so on. Such biocides have numerous disadvantages. In fact, some are toxic and subject to strict legal limits and, therefore, can only be used in limited quantities. Furthermore, they have a tendency to exude from the coating after it has dried into a thin layer, as it should when used correctly, ending up in the surrounding environment.
Questo può essere un ulteriore problema, per esempio per vernici usate su superfici che vengono a contatto con la pelle o i cibi, come i mobili di cucine o bagni. Anche quei biocidi che non sono tossici, quando essudano possono presentare rischi se presentano un carattere sensibilizzante. This can be an additional problem, for example for paints used on surfaces that come into contact with skin or food, such as kitchen or bathroom furniture. Even those biocides which are not toxic, when they exude can present risks if they have a sensitizing character.
In aggiunta, quando la vernice o pittura à ̈ stata usata correttamente ed à ̈ diventata un rivestimento su un supporto d’altro materiale, avendo seccato, filmato e, se appropriato, reticolato, perde la sua funzione protettiva quando microorganismi come batteri o muffe attaccano la vernice o pittura stessa o il materiale di supporto. Questo problema si presenta soprattutto quando il materiale di supporto à ̈ facilmente biodegradabile, come nel caso di carta o legno. Gli stessi biocidi che combattono microorganismi nella vernice liquida hanno un’attività parziale anche quando la vernice o pittura à ̈ secca. Però, come già notato, essi tendono ad essudare e vengono consumati quando agiscono contro i microbi, o si degradano in altro modo, come per decomposizione fotochimica o idrotermica. Pertanto, il loro effetto -diminuisce gradualmente nel tempo fino a scomparire del tutto. In addition, when the varnish or paint has been used correctly and has become a coating on a support of another material, having dried, filmed and, if appropriate, cross-linked, it loses its protective function when microorganisms such as bacteria or mold they attack the varnish or paint itself or the carrier material. This problem occurs especially when the support material is easily biodegradable, such as in the case of paper or wood. The same biocides that fight microorganisms in liquid paint have partial activity even when the paint or paint is dry. However, as already noted, they tend to exude and are consumed when they act against microbes, or otherwise degrade, such as by photochemical or hydrothermal decomposition. Therefore, their effect gradually decreases over time until it disappears completely.
Infine, i microbi, sia batteri che muffe, possono proliferare su una superficie verniciata come sulla maggior parte delle superfici, nutrendosi di residue commestibili che non possono essere rimossi a lungo termine neppure dalla pulizia più accurata. La presenza di microbi su dei mobili, specialmente da cucina o bagno, come pure su pavimenti ed altre superfici di casa, ha portato al crescente uso di detersivi casalinghi disinfettanti. Questi si basano sugli stessi agenti antibiotici già citati per la protezione della vernice e presentano problemi di dispersione ne ambiente e di azione sensibilizzante se non persino di tossicità , molto peggiori di quelle dovute alla pittura o vernice stesse. Finally, microbes, both bacteria and molds, can proliferate on a painted surface as on most surfaces, feeding on edible residues that cannot be removed in the long term even by the most thorough cleaning. The presence of microbes on furniture, especially in the kitchen or bathroom, as well as on floors and other surfaces in the home, has led to the increasing use of disinfectant household detergents. These are based on the same antibiotic agents already mentioned for the protection of the paint and present problems of dispersion in the environment and of sensitizing action if not even of toxicity, much worse than those caused by the paint or varnish themselves.
L'invenzione qui esposta risolve tutti i problemi descritti. Si à ̈ scoperto che le formule di pitture all’acqua qui descritte controllano in modo soddisfacente la crescita di microrganismi nella pittura o vernice liquida, nel rivestimento essiccato, che ha formato una pellicola e, se del caso, ha reticolato su un altro materiale, e, infine, sulla superficie di tale pittura o rivestimento. Esse raggiungono questo risultato senza includere componenti tossici o sensibilizzanti, invece sfruttando le proprietà dell’argento metallico, cioà ̈ argento elettronicamente neutro, nello stato di ossidazione zero e non legato ad altri elementi chimici. The invention disclosed herein solves all the problems described. It was found that the water-based paint formulas described here satisfactorily control the growth of microorganisms in the paint or liquid paint, in the dried coating, which has formed a film and, where appropriate, cross-linked to another material. , and, finally, on the surface of such paint or coating. They achieve this result without including toxic or sensitizing components, instead exploiting the properties of metallic silver, that is electronically neutral silver, in a zero oxidation state and not bound to other chemical elements.
L'argento viene incorporato nella vernice sotto forma di particelle nanomeriche. L’uso di particelle nanomeriche di argento metallico à ̈ descritto, per esempio, in Silver is incorporated into the paint in the form of nanomeric particles. The use of nanomeric particles of metallic silver is described, for example, in
EP2136645, US6822034, USUS2010136073 e WO2010060652. Tali brevetti descrivono le nanoparticelle disperse in diversi materiali come plastica o gomma, inclusi in diversi materiali di trasporto come zeoliti o vetro, ed anche in combinazione con altri agenti attivi. La composizione descritta in GB467631, del 1936, già comprende l’uso di colloide di argento metallico in una formula antimicrobica. EP2136645, US6822034, USUS2010136073 and WO2010060652. These patents describe nanoparticles dispersed in different materials such as plastic or rubber, included in different transport materials such as zeolites or glass, and also in combination with other active agents. The composition described in GB467631, dated 1936, already includes the use of metallic silver colloid in an antimicrobial formula.
Quest’invenzione, tuttavia, consente di sfruttare le proprietà antimicrobiche dell’argento anche in mezzi poco viscosi come una pittura o rivestimento all’acqua, e senza cambiarne l’aspetto o qualsiasi altra caratteristica. This invention, however, allows the antimicrobial properties of silver to be exploited even in low viscous media such as a water-based paint or coating, and without changing its appearance or any other characteristic.
Descrìzione dettagliata dell’invenzione Detailed description of the invention
Per poter disperdere nanoparticelle d’argento metallico in modo affidabile e omogeneo in un mezzo poco viscoso come una vernice ad acqua, le particelle vengono preventivamente incapsulate in liposomi a doppio strato. La dispersione che si forma così si può meglio descrivere come un'emulsione di acqua in acqua, in cui le particelle di nano argento sono immerse nell’acqua contenuta nei piccoli liposomi, i quali le tengono distribuite omogeneamente nella massa del liquido e separate l’una dall’altra, evitandone in tal modo la coalescenza dovuta all’attrazione tra particelle, l'accrescimento ed infine la precipitazione. Senza tali nuovi agenti disperdenti, l’efficacia dell’argento contro i microorganismi diminuisce rapidamente, mentre la pittura o rivestimento rimane liquida, e non può essere rinnovata mescolando o agitando. In order to be able to reliably and homogeneously disperse metallic silver nanoparticles in a low viscous medium such as a water-based paint, the particles are previously encapsulated in double-layer liposomes. The dispersion that is formed in this way can best be described as an emulsion of water in water, in which the particles of nano silver are immersed in the water contained in the small liposomes, which keep them homogeneously distributed in the mass of the liquid and separated. one from the other, thus avoiding the coalescence due to the attraction between particles, the growth and finally the precipitation. Without these new dispersing agents, the effectiveness of silver against microorganisms decreases rapidly, while the paint or coating remains liquid, and cannot be renewed by stirring or stirring.
I liposomi usati per questa invenzione sono composti di molecole anfifiliche che possono essere fosfolipidi di qualsiasi tipo, in generale di origine naturale, sia vegetale che animale, acidi grassi e oli. Un esempio molto comune à ̈ la lecitina di soia. Il rapporto utile tra materiale anfifilico e argento, in peso, va da 1 :1 a 1000:1 , preferibilmente tra 10:1 e 100:1. Diverse procedure di produzione possono portare a liposomi di diversa dimensione ed ad un possibile eccesso di liposomi vuoti, cioà ̈ senza nanoparticelle d’argento. La dimensione dei liposomi non ha effetto sulle caratteristiche ottiche del rivestimento finale dato che i liposomi stessi si aprono e, in effetti, si dissolvono nel materiale di rivestimento mentre esso essicca, reticola o in qualche altro modo forma una pellicola. Un tale processo à ̈ interamente compatibile con la coalescenza che interessa le goccioline di emulsione o le particelle di dispersione, cioà ̈ la forma liquida dei materiali di rivestimento a base acqua, quando esse formano la pellicola solida finale del rivestimento stesso. The liposomes used for this invention are composed of amphiphilic molecules which can be phospholipids of any type, generally of natural origin, both vegetable and animal, fatty acids and oils. A very common example is soy lecithin. The useful ratio of amphiphilic material to silver, by weight, ranges from 1: 1 to 1000: 1, preferably between 10: 1 and 100: 1. Different production procedures can lead to liposomes of different sizes and to a possible excess of empty liposomes, ie without silver nanoparticles. The size of the liposomes has no effect on the optical characteristics of the final coating as the liposomes themselves open and, in effect, dissolve in the coating material as it dries, crosslinks or in some other way forms a film. Such a process is entirely compatible with coalescence involving emulsion droplets or dispersion particles, i.e. the liquid form of water-based coating materials, when they form the final solid film of the coating itself.
L’efficacia per la lotta ai microorganismi dipende dalla possibilità di contatto tra il metallo e i microorganismi, e dal rilascio di ioni argento dalla superficie delle particelle: Pertanto essa à ̈ una funzione del numero di particelle metalliche e della superficie totale disponibile che esse presà ̈ntano, piuttosto che del peso del metallo. La dimensione nanomerica delle particelle impiegate in questa invenzione assicura un’efficacia maggiore, per unità di peso del metallo, di quella che potrebbe essere ottenuta da, per esempio, particelle micrometriche. The effectiveness for the fight against microorganisms depends on the possibility of contact between the metal and the microorganisms, and on the release of silver ions from the surface of the particles: Therefore it is a function of the number of metal particles and the total available surface that they take. ̈Ntano, rather than the weight of the metal. The nanomeric size of the particles used in this invention ensures greater effectiveness, per unit of metal weight, than that which could be obtained from, for example, micrometric particles.
L’utilizzo dell’argento in forma nanomerica ha anche altri benefici che sono molto importanti per l’uso in una pittura o rivestimento, cioà ̈ in prodotti che hanno in genere una funzione estetica oltre che pratica. Infatti l’argento nanomerico non disperde la luce come farebbe se fosse sotto la forma di paricene più grandi. Perciò le formule di quest’invenzione possono essere perfettamente trasparenti e di alta lucentezza, due proprietà che sono importanti per molte pitture o vernici. Inoltre, benché l’argento nanomerico assorba intensamente la luce visibile, mostrando un colore che dipende dalla dimensione delle particelle, poiché le concentrazioni (in peso) necessarie ad impartire le desiderate proprietà antimicrobiche sono piccolissime, l'effetto sul colore finale della pittura o vernice à ̈ molto piccolo ed à ̈ facilmente corretto con metodi ben noti. Perciò le particelle d’argento impiegate in quest’invenzione hanno dimensioni comprese tra 1 e 1000 nm, o preferibilmente tra 5 e 100 nm. The use of silver in nanomeric form also has other benefits that are very important for use in a paint or coating, that is, in products that generally have an aesthetic function as well as a practical one. In fact, nanomeric silver does not scatter light as it would if it were in the form of larger paricene. Therefore the formulas of this invention can be perfectly transparent and of high gloss, two properties that are important for many paints or varnishes. Furthermore, although nanomeric silver intensely absorbs visible light, showing a color that depends on the size of the particles, since the concentrations (by weight) necessary to impart the desired antimicrobial properties are very small, the effect on the final color of the paint or varnish is very small and is easily corrected by well known methods. Therefore the silver particles used in this invention have dimensions between 1 and 1000 nm, or preferably between 5 and 100 nm.
Con particelle di tali dimensioni, la concentrazione effettiva d’argento con un effetto antimicrobico sufficienteà ̈ tra 10 e 0,1 parti per milione, cioà ̈ tra 10 g in 1000 Kg e 0,1 g in 1000 Kg. Tali quantità vengono calcolate in relazione al peso secco finale se si desidera attività nel rivestimento secco finale, o in relazione al peso della formula se l’effetto desiderato à ̈ come preservante in latta. With particles of this size, the effective concentration of silver with a sufficient antimicrobial effect is between 10 and 0.1 parts per million, ie between 10 g in 1000 kg and 0.1 g in 1000 kg. These quantities are calculated in relation to the final dry weight if activity in the final dry coating is desired, or in relation to the weight of the formula if the desired effect is as a tin preservative.
Le pitture, vernici o rivestimenti ad acqua che sono il campo d’applicazione di quest’invenzione includono quelli in cui il legante à ̈ in un'emulsione di olio in acqua o di acqua in olio, una dispersione in acqua, o una soluzione. Il legante può essere, dal punto di vista chimico, una macromolecola o polimero acrilico, vinilico, uretanico, poliuretanico, alchidìco, estere, poliestere, etere, polietere di qualsiasi peso molecolare, un copolimero o miscela che combini qualunque di tali molecole o polimeri. Tali rivestimenti, pitture o vernici possono inoltre includere uno o più tra i coalescenti, pigmenti, coloranti, cariche, disperdenti, surfattanti, modificatori di reologia, catalizzatori o altri degli additivi comunemente usati. Tali rivestimenti, pitture o vernici possono essere monocomponente, tali da formare una pellicola solida in assenza di reazione con agenti o stimoli esterni, oppure reagendo con ossigeno o umidità atmosferici o à ltri simili stimoli e componenti ambientali. Essi possono essere tali da avere bisogno di altri componenti per poter formare una pellicola solida, reagendo con stirene o poliisocianati o qualunuque altro agente reticolante o indurente. Essi possono reticolare a seguito dell’iniezione di energia elettromagnetica, specialmente luce ultravioletta o radiazione di raggio di elettroni, con o senza la mediazione di foto iniziatori. Infine, tali rivestimenti, pitture o vernici possono essere una combinazione dei tipi già descritti, come noto. Water-based paints, varnishes or coatings that are the scope of this invention include those in which the binder is in an oil-in-water or water-in-oil emulsion, a dispersion in water, or a solution. The binder can chemically be a macromolecule or polymer that is acrylic, vinyl, urethane, polyurethane, alkyd, ester, polyester, ether, polyether of any molecular weight, a copolymer or mixture that combines any of these molecules or polymers. Such coatings, paints or varnishes may further include one or more of the coalescers, pigments, dyes, fillers, dispersants, surfactants, rheology modifiers, catalysts or other commonly used additives. Such coatings, paints or varnishes can be single-component, such as to form a solid film in the absence of reaction with external agents or stimuli, or by reacting with oxygen or atmospheric humidity or other similar stimuli and environmental components. They may be such that they need other components in order to form a solid film by reacting with styrene or polyisocyanates or any other cross-linking or hardening agent. They can reticulate as a result of the injection of electromagnetic energy, especially ultraviolet light or electron beam radiation, with or without the mediation of photo initiators. Finally, such coatings, paints or varnishes can be a combination of the types already described, as is known.
Esempi Examples
1 - Sono state prodotte tre vernici: A (controllo senza argento), B (controllo senza liposomi) e C (esempio dell'invenzione), usando componenti prive dei comuni agenti biocidi ed antimicrobici, identiche ad eccezione del fatto che in B sono stati aggiunti 0,4 ppm di argento metallico nanomerico, ed in C, secondo la presente invenzione, sono stati aggiunti 0,4 ppm di argento metallico nanomerico incapsulato in liposomi. Le concentrazioni delle varie componenti sono date come percentuali rispetto alla composizione finale, sommando le quantità d’acqua in cui tutte tali componenti sono comunemente disperse o disciolte già prima di essere combinate. 1 - Three paints were produced: A (control without silver), B (control without liposomes) and C (example of the invention), using components free of the common biocidal and antimicrobial agents, identical except that in B they were 0.4 ppm of nanomeric metallic silver were added, and in C, according to the present invention, 0.4 ppm of nanomeric metallic silver encapsulated in liposomes were added. The concentrations of the various components are given as percentages with respect to the final composition, adding the quantities of water in which all these components are commonly dispersed or dissolved before being combined.
A B A B
emulsione di copolimero acrilico 14 14 14 dispersione poliuretanica 13 13 13 acrylic copolymer emulsion 14 14 14 polyurethane dispersion 13 13 13
acqua 65 65 65 water 65 65 65
eteri di glicole polipropilenico 3 3 3 Polypropylene glycol ethers 3 3 3
cera 3 3 3 wax 3 3 3
silice 1 1 1 modificatori di superficie e reologia 1 1 1 silica 1 1 1 surface modifiers and rheology 1 1 1
nanoparticelle dì Ag 0 0,00004 0 nanoparticelle di Ag in liposomi 0 _ 0 _ 0.00004 Ag nanoparticles 0 0.00004 0 Ag nanoparticles in liposomes 0 _ 0 _ 0.00004
2 - Una porzione delle formule A e C à ̈ stata usata per verniciare dei pannelli di legno standard sopra un fondo poliestere, catalizzata da 10% (rispetto al peso di A e C) di poliisocianato alifatico da esametilen 1 ,6 diisocianato, così da ottenere una copertura di circa 120 g/m<2>della vernice liquida. Dopo avere atteso due settimane a temperatura di 25 C per assicurare che la vernice avesse completato il processo di essiccazione, reticolazione e formazione di un rivestimento solido, i campioni sono stati sottoposti a test di attività antimicrobica secondo lo standard ASTM E 2180-07. Secondo questo protocollo, à ̈ stato contato il numero di microorganismi attivi su una superficie inoculata, ad un tempo 0 e dopo 24 ore, in condizioni definite di temperatura, umidità e mezzo di coltura. I risultati per una estesa selezione di batteri e di muffe dimostrano come la loro moltiplicazione à ̈ bloccata sulla superficie della formula C rispetto a quello che avviene sulla superficie della formula di controllo senza argento A, così che il numero di microorganismi presenti dopo 24 ore à ̈ drasticamente ridotto.<â– >2 - A portion of formulas A and C was used to paint standard wood panels over a polyester primer, catalyzed by 10% (with respect to the weight of A and C) of aliphatic polyisocyanate from hexamethylene 1, 6 diisocyanate, so to obtain a coverage of about 120 g / m <2> of the liquid paint. After waiting two weeks at 25 C to ensure that the paint had completed the process of drying, crosslinking and forming a solid coating, the samples were tested for antimicrobial activity according to the ASTM E 2180-07 standard. According to this protocol, the number of active microorganisms on an inoculated surface was counted, at a time 0 and after 24 hours, under defined conditions of temperature, humidity and culture medium. The results for an extensive selection of bacteria and molds show how their multiplication is blocked on the surface of formula C compared to what happens on the surface of the silver-free control formula A, so that the number of microorganisms present after 24 hours It is drastically reduced. <–>
I risultati sono riportati di seguito The results are shown below
straphilococcus aureus t = 0 t = 24 hr straphilococcus aureus t = 0 t = 24 hr
A 1 ,4*10<6>5,6*1 0<6>A 1, 4 * 10 <6> 5.6 * 1 0 <6>
C 1 ,3*10<6>1 ,4*10<3>C 1, 3 * 10 <6> 1, 4 * 10 <3>
pseudomonas aeruginosa t = 0 t = 24 hr pseudomonas aeruginosa t = 0 t = 24 hr
A 1 ,4*10<6>9, 1 *10<5>A 1, 4 * 10 <6> 9, 1 * 10 <5>
C 1 ,0*10<6>1 ,5*10<3>C 1, 0 * 10 <6> 1, 5 * 10 <3>
escherichia coli t = 0 t = 24 hr escherichia coli t = 0 t = 24 hr
A 8*10<5>1 ,1*10<6>A 8 * 10 <5> 1, 1 * 10 <6>
C 6,9*1 0<5>1 ,3*10<3>C 6.9 * 1 0 <5> 1, 3 * 10 <3>
salmonella typhimurium t = 0 t = 24 hr salmonella typhimurium t = 0 t = 24 hr
A 1 ,5*10<6>1 ,2*10<6>A 1, 5 * 10 <6> 1, 2 * 10 <6>
C 9,2*1 0<5>1 ,2*10<3>C 9.2 * 1 0 <5> 1, 2 * 10 <3>
candida albicans t = 0 t = 24 hr candida albicans t = 0 t = 24 hr
A 1 ,1*10<6>2,2*10<6>A 1, 1 * 10 <6> 2.2 * 10 <6>
C 9,6*1 0<5>3,8*1 0<2>C 9.6 * 1 0 <5> 3.8 * 1 0 <2>
aspergillus niger t = 0 t = 24 hr aspergillus niger t = 0 t = 24 hr
A 5,3*1 0<5>3*1 0<5>A 5.3 * 1 0 <5> 3 * 1 0 <5>
C 5,7*1 0<5>3,3*1 0<2>C 5.7 * 1 0 <5> 3.3 * 1 0 <2>
3 - Porzioni delle formule A, B e C sono state e tenute ferme per 30 giorni in contenitori sigillati, dopodiché sono state inoculate con batteri e muffe da vernici marcite spontaneamente, e, dopo essere state agitate, tenute ferme per altri due giorni. Poi, in tali contenitori sono stati immersi delle lamelle ricoperte di mezzi di coltura specifici per batteri e muffe (Heipha dip slides), su cui si à ̈ formato un sottile strato di vernice. Esse sono state poi messe in incubazione in forno a 30C per due giorni. Dopo i due giorni, una crescita di batteri poteva essere osservata sulle lamelle immerse in A e B ma non su quelle immerse in C, indicando che la presenza di nano argento incapsulato in liposomi, ma non di nano argento non incapsulato, aveva ridotto significativamente la concentrazione di batteri vivi nella formula C anche quando liquida, a quéste concentrazioni. 3 - Portions of formulas A, B and C were and kept firm for 30 days in sealed containers, after which they were inoculated with bacteria and molds from spontaneously rotted paints, and, after being shaken, kept firm for another two days. Then, in these containers, lamellae covered with specific culture media for bacteria and molds (Heipha dip slides) were immersed, on which a thin layer of paint was formed. They were then incubated in an oven at 30C for two days. After the two days, bacterial growth could be observed on the lamellae immersed in A and B but not on those immersed in C, indicating that the presence of liposome-encapsulated nano silver, but not of non-encapsulated nano silver, had significantly reduced the concentration of live bacteria in formula C even when liquid, at these concentrations.
Rivendicazioni Claims
1) Una pittura, vernice o rivestimento ad acqua al cui interno e sulla cui superficie, dopo la trasformazione in una pellicola solida, i microorganismi, compresi batteri e muffe, scompaiono o non possono moltiplicarsi, che include nanoparticelle d'argento metallico incapsulate e disperse da liposomi. 1) A paint, varnish or water-based coating in which and on the surface of which, after transformation into a solid film, microorganisms, including bacteria and molds, disappear or cannot multiply, which includes encapsulated and dispersed metallic silver nanoparticles from liposomes.
2) Una formulazione come in rivendicazione 1) sulla cui superficie, dopo che sia essiccata, reticolata, abbia formato una pellicola o abbia formato comunque un rivestimento continuo su un altro materiale, i microorganismi, compresi batteri e muffe, scompaiano o non possano moltiplicarsi. 2) A formulation as in claim 1) on the surface of which, after it has been dried, cross-linked, has formed a film or has formed a continuous coating on another material, microorganisms, including bacteria and molds, disappear or cannot multiply.
3) Una formulazione come nelle rivendicazioni 1) e 2), in cui le nanoparticelle d’argento metallico hanno dimensioni comprese tra 1 e 1000 nm, preferibilmente tra 5 e 100 nm. 3) A formulation as in claims 1) and 2), in which the metallic silver nanoparticles have dimensions between 1 and 1000 nm, preferably between 5 and 100 nm.
4) Una formulazione come nelle rivendicazioni da 1) a 3) in cui i liposomi sono formati di composti anfifilici di origine naturale, vegetale o animale 4) A formulation as in claims 1) to 3) in which the liposomes are formed of amphiphilic compounds of natural, vegetable or animal origin
5) Una formulazione come nelle rivendicazioni da 1) a 4) in cui il rapporto tra il materiale che forma i liposomi e l’argento à ̈ compreso tra 1 :1 e 1000:1 in peso, preferibilmente tra 10:1 e 100:1. 5) A formulation as in claims 1) to 4) in which the ratio between the material that forms the liposomes and silver is between 1: 1 and 1000: 1 by weight, preferably between 10: 1 and 100 : 1.
6) Una formulazione come nelle rivendicazioni 1) e da 3) a 5), in cui la concentrazione di argento metallico sia compresa tra 10 e 0,1 ppm, cioà ̈ tra 10 g in 1000 Kg e 0,1 g in 1000 Kg rispetto al peso di tutta la formulazione. 6) A formulation as in claims 1) and 3) to 5), in which the metallic silver concentration is between 10 and 0.1 ppm, i.e. between 10 g in 1000 Kg and 0.1 g in 1000 Kg compared to the weight of the whole formulation.
7) Una formulazione come nelle rivendicazioni da 1) a 5), in cui la concentrazione di argento metallico sia compresa tra 10 e 0,1 ppm, cioà ̈ tra 10 g in 1000 Kg e 0,1 g in 1000 Kg rispetto al peso finale del rivestimento solido formato dalla formulazione 7) A formulation as in claims 1) to 5), in which the metallic silver concentration is between 10 and 0.1 ppm, i.e. between 10 g in 1000 kg and 0.1 g in 1000 kg with respect to the weight final solid coating formed by the formulation
Claims (4)
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US20040096469A1 (en) * | 2002-11-14 | 2004-05-20 | Lewis Jennifer A. | Controlled dispersion of colloidal suspensions by comb polymers |
WO2006115547A2 (en) * | 2005-04-20 | 2006-11-02 | Dendritic Nanotechnologies, Inc. | Dendritic polymers with enhanced amplification and interior functionality |
WO2008079898A1 (en) * | 2006-12-20 | 2008-07-03 | Pharmwest, Inc. | Methods and topical formulations comprising colloidal metal for treating or preventing skin conditions |
WO2009073193A2 (en) * | 2007-12-03 | 2009-06-11 | The Johns Hopkins University | Methods of synthesis and use of chemospheres |
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US20040096469A1 (en) * | 2002-11-14 | 2004-05-20 | Lewis Jennifer A. | Controlled dispersion of colloidal suspensions by comb polymers |
WO2006115547A2 (en) * | 2005-04-20 | 2006-11-02 | Dendritic Nanotechnologies, Inc. | Dendritic polymers with enhanced amplification and interior functionality |
WO2008079898A1 (en) * | 2006-12-20 | 2008-07-03 | Pharmwest, Inc. | Methods and topical formulations comprising colloidal metal for treating or preventing skin conditions |
WO2009073193A2 (en) * | 2007-12-03 | 2009-06-11 | The Johns Hopkins University | Methods of synthesis and use of chemospheres |
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