ADDITIVES | BIOCIDES
8071 EVA is currently EPA registered. Other new products – Biochek 8068 (in Mesamoll) and 8069 (in DINP) – are liquid blends of TBZ with propicona- zole. These are said to improve colour-fastness in plastisol-covered textiles that may be exposed to high sun/UV irradiation, and they are intended as a complementary solution to the IPBC-containing products. The grades are registered with the US EPA and under the EU BPR. TBZ, which is also used in post-harvest treatment
Above: Lanxess has developed a range of Biochek OBPA alternatives for protecting flexible PVC products
Troy is the only EPA registrant for OBPA, which means that the company takes sole responsibility for the development of the data required by the EPA registration review decision. It says it will complete the data call-in studies for OBPA by the end of 2019. “Troy is confident that OBPA will not encounter any issues based on the data developed to date for Registration Review,” says the company, adding that OBPA has already achieved registra- tion in the State of California. “This is a significant milestone because Califor-
nia, much like the EU, has a reputation for stringent regulations placed on chemicals. As a result, gaining approval in California is excellent news for formulators incorporating OBPA, and an indication that the future of this technology is very positive,” the company says.
Right: The Streptomyces species can cause “pink stain” in plastics, exhibiting a range of pigmentation from pink to brown
depending on the nutrients available to it
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OBPA alternatives Alternatives to OBPA are available, however, and Lanxess Material Protection Products (MPP) has added several biocides for protection of PVC that are based on thiabendazole (TBZ). Biochek 8071 is a pelletised blend of TBZ and IPBC in a polymer carrier. Liquid Biochek products (a dispersion of the active ingredients in plasticisers such as DINP, DOTP, or Lanxess’s own Mesamoll) are designed to enable the biocide to be introduced at the dry blend or plastisol stage of compound preparation; pelletised Biochek masterbatches are designed for customers using ready-to- extrude compounds and allow the biocide to be incorporated via a side-feeder during extrusion. Biochek 8071 EVA, 8071 PVC and 8071 LDPE, all based on the same TBZ/IPBC combination but in differ- ent polymer carriers, are all available as pelletised masterbatches, but only
COMPOUNDING WORLD | July 2018
of citrus fruits, has an excellent toxicity profile and the combination of TBZ with IPBC or propiconazole results in a synergistic effect and better coverage than a single active product, according to Andreas Boettcher, Global Manager Technical Marketing Industrial Preservation, Lanxess.
Testing pink stains One of the key tests for plastics containing bioc- ides is ASTM E1428 – the so-called “pink stain” test method. This evaluates susceptibility to staining caused by the streptomyces species microorgan- isms. The current test was designed primarily for flat sheets but is less reliable when testing three dimensional or porous substrates, such as open cell foams. So, the ASTM WK 48611 working group has developed an alternative and more reliable test method, which they hope will be approved by the end of the year. “The proposed new method has major changes in inoculum preparation and the inoculum vehicle that will reduce the false positive and false negative test results. These changes provide better cover- age of uneven and porous substrates allowing contact with increased surface area of the test material which more closely replicates end-user conditions,” says Maria Regina Prioli, Global Marketing Manager, Materials Performance & Protection at Lonza and technical contact for the ASTM working group.
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