additives | PVC plasticisers Right: Per-
storp’s Pevalen non-phthalate
PVC plasticiser has obtained FDA compli- ance for key food contact applications such as
conveyor belts
from renewable sources are getting more available in the market, their price is becoming more attractive and of course their use is increasing,” she says. Recognising the increasing importance of non- orthophthalate plasticisers, Grupa Azoty added Oxoviflex DEHT to its range some time back. However, Marcin Zemczak, Marketing Specialist at the company, says that introduction just marked the beginning of new plasticiser developments. “An important factor that we observe is the increas-
ing role of specialty plasticisers. That is why we have launched Specialty Esters Project (SEP), which is our key development activity. The core part will be a new plant, coming on stream in 2018, dedicated to innova- tive, specialty plasticisers including polyesters and bio-based plasticisers. The production plant will be accompanied by a semi-industrial unit designed for developing and producing batches of new plasticiser types,” he says. “We also believe that the future is in customisation – creating new formulas and smart additives together with customers.”
Below: Grupa Azoty’s oxo alcohols plant. The company is Europe’s fifth largest producer of oxo alcohols and plasticisers
Food approval PVC plays a much smaller part in food packaging these days (even cling film is now largely polyolefinic), but there are still applications in the food industry where it plays an important role, such as conveyor belts. In February this year, Perstorp said that a new independ- ent study on the toxicological properties of its Pevalen non-phthalate plasticiser for PVC provided evidence that Pevalen has no toxic properties and that it should be approved for food contact applications. Perstorp developed Pevalen (PETV or pentaerythritol
tetravalerate) to provide uncompromising performance in close- to-consumer applications in flexible PVC. It is already widely used for products such as coated fabrics,
but approval for use in products made from flexible PVC that may come into contact with food — such as conveyor belts in food preparation plant — is ongoing due to the more strict testing requirements. The recently completed study, carried out by the independent Research Toxicology Centre (RTC) at Pomezia in Italy, is a key requirement for approval by the US Food and Drug Administration (FDA). The tests showed Pevalen is non-toxic even at the highest dosage required by standard protocols. “This study is the latest and most detailed of several studies showing that Pevalen is non-toxic,” says Carina Fogelberg, Product Stewardship and Regulatory Affairs Specialist at Perstorp. “We shall now move ahead to obtain full food contact approvals as soon as possible.”
Legal opinion More recently, in April, Perstorp said it had obtained independent expert legal opinion that Pevalen can be used in the US at levels up to 32% in PVC intended to produce conveyor belts and gloves used in meat and poultry processing facilities, as well as in tablecloths. That opinion said: “Sufficient scientific evidence supports the conclusion that the intended uses of the Pevalen are GRAS [Generally Regarded As Safe] and that Pevalen may be lawfully used as intended without obtaining prior approval from, or notifying, FDA.” David Bray, Vice President of Perstorp’s Plasticisers BU, says the GRAS notification will enable the company to enter the US market for food contact applications in PVC ahead of FDA approval. Adeka is another supplier of non-phthalate plasticis-
ers, including trimellitates, but it also has an aromatic- free solution – ADK CIZER PN-7160 – an adipate polyester. “ADK CIZER PN-7160 shows excellent oil extraction and superior elongation retention compared to DOP,” the company says (Figure 1). Other attributes cited by the supplier include low viscosity (150 mPa-sec
44 COMPOUNDING WORLD | August 2017
www.compoundingworld.com
PHOTO: PERSTORP/SHUTTERSTOCK
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