Antimicrobials | additives feature Thomas Robitaille, global technical marketing lead
for plastics at Lonza Microbial Control, says that, with the passing of OBPA, the days of a single antimicrobial treatment that can be used at one or two use levels in all end-use environments are over. The various antimicrobials now available have different benefits depending on the materials in which they are incorporated and the environment in which finished products are used, so the antimicrobial package will need to be specifically designed for each application. Robitaille says that most antimicrobials available for
OBPA replacement in flexible PVC are, like OBPA itself, soluble in plasticizers. This carries the disadvantage that, if the plasticizer migrates or leaches from the product, it takes all the antimicrobial with it at a very high concentration, depleting the “reservoir” of antimicrobial in the actual treated product. In a system in which the antimicrobial is mechanically bound in the PVC matrix, the loss of antimicrobial would be corre- spondingly less. Applications such as geo-membranes, roofing
membranes, tarpaulins, pond and pool liners, and underground sheeting can benefit greatly by increasing
Samples from Lonza show problems of ASTM testing in determining effectiveness of antimicrobials for PVC – both samples are free from antimicrobial growth but the one on the right fails because it is stained by metabolite migration
the expected useful lifetime of the finished product through the use of antimicrobials with a “dual solubil- ity” profile, Robitaille says. Lonza now offers such systems. The company’s product mix can, he says, cover all the bases: environments with high moisture levels, high UV levels, high leaching, and so on.
Polymers
ENSACO TIMCAL Carbon Black
• electrical conductivity • easy-dispersion • high purity
For electronic packaging, fuel hoses, fl ooring, power cables and accessories, conveying belts, ATEX applications.
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TIMREX TIMCAL Graphite
• thermal conductivity • electrical conductivity • lubrication
For seals, water-meters, heat sinks, geothermal pipes, LED light sockets, primers for electrostatic painting, gas barrier properties.
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CONDUCTIVE CARBON BLACK
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