additives feature | Antimicrobials Microban does offer triclosan (5-chloro-2-(2,4-
Kitchen tools are a typical target applica- tion for antimicrobials
antimicrobial in masterbatch form (the company also sells the pure additive to companies with their own compounding capability). Recent results of a three-year clinical study of 86 preterm infants receiving umbilical vein catheters (UVC’s), half with Agion and half without, showed that patients receiving the untreated catheters had an infection rate of 22%, while the patients with the Agion treated catheters had an infection rate of 2%. Another antimicrobials specialist, Microban says that it has over 20 different technologies in its portfolio, including both organic and inorganic chemistries, but the bulk of the thermoplastic products which use Micro- ban today are treated with silver or zinc. The cost/ performance balance for end-use applications is acceptable for these technologies, the company says. “The wider appeal of these technologies is their acceptance across multiple territories, spanning the Americas, Asia, and EMEA,” says Jonathan Clapp, technical manager with Microban Europe in Cannock, England. “New technologies looking at improved performance
are under development as the next generation of additives,” he adds. “These are hoped to bring down the gap between surface disinfection using liquid cleaners, and built-in technologies. Development work is still ongoing.”
New Sanitized antimicrobials prevent
microbes
breaking down plasticizers in PVC in outdoor applications
dichlorophenoxy)phenol) antimicrobials, but Clapp says that for the European market at least, Microban no longer promotes their use. “This is based on European consumer perception that has led to business decisions to promote/support other biocides” he says. “Triclosan is a highly effective broad-spectrum preservative that has been used safely in treated articles for a very long time, and continues to be an important biocide in other parts of the world.” Organic options from Microban range from zinc pyrithione to isothiazolinones and thiabendazole. “We are technology agnostic and will develop a solution based on best technology for material and application,” Clapp says. “We can offer both antibacterial and antifungal solutions.” Milliken’s AlphaSan antimicrobial additive incorpo-
rates silver ions to interfere with bacterial metabolisms, preventing reproduction and spreading. Sanitized antimicrobial protection finds application in flooring, door handles and support railings, ventila- tion ducts (especially in air-conditioning equipment), medical equipment, toilets or washbasins and sinks. Communications manager Sibylle Hänni says that the company calls on various biocidal substances to solve client problems.
Stable solutions Among new products, she cites Sanitized PL 12-32, a formulation with high water resistance and UV stability for outdoor applications such as awnings and tents. A second new product, Sanitized PL 12-33 is character- ized by high thermal stability, aimed at indoor applica- tions such as flooring and furnishings. Plastisols, coatings or foams employed in many
flexible PVC products are very sensitive to attacks from microbes, Hänni points out. Especially in outdoor applications, the extra-cellular enzymes in such microbes can break down plasticizers as well as other additives that are susceptible to them. The result is that PVC products gradually become stiff and brittle. “By
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COMPOUNDING WORLD | July 2014
www.compoundingworld.com
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