ADDITIVES | PACKAGING
levels below 1ppm for 588 days (more than 18 months) in testing of a 23g 0.5-liter PET bottle (PET without the additive maintained oxygen levels below 1ppm for just 22 days while a competitive oxygen scavenger lasted 63 days, the company says). Effectiveness of the additive depends on the additive loading, package size and design. At a loading of 2%, for example, CESA ProTect master- batches were found to be effective for 266 days. The company says initial customer trials have been successful. The masterbatch has little, if any, impact on transparency, appearance, or mechani- cal properties of the packaging, and does not appear to impact on processing. Food contact approvals are pending. Milliken’s ClearShield UV absorber can also
Above: Clariant’s CESA ProTect masterbatches provide oxygen protection for mono-material PET packaging
claimed to remove residual oxygen from the package to achieve a shelf life of 24 months. ITENE says it could replace MAP flexible packaging in some applications. Other projects at ITENE include development of
a package for fresh chicken that incorporates an antimicrobial-releasing function to control bacteria and to generate carbon dioxide in the package as an alternative to MAP. The group has also developed Pasta-Activepack, an active coating that “repels insects and absorbs moisture that protects and preserves dried food products from pantry pest infestations.” For this project, funded by the Spanish Ministry of Economy and Competitiveness, it collaborated with film producer Plásticos del Segura and food firm Pastas Alimenticias Romero.
Targeting oxygen PET containers are typically already mono-material and recyclable but, as use expands to food and beverage products beyond water and carbonated beverages, more protection may be needed. Clariant has introduced a new brand of patented oxygen scavenger additive masterbatches—CESA ProTect—designed for use in monolayer PET packaging. The company says the masterbatch “is based on a new molecule that goes beyond existing solutions for PET in protecting content shelf life and taste.” The additive is said to help prevent oxidative
degradation such as flavour loss in coffee capsules, vitamin potency loss and colour change in fruit juices, souring in dairy products, and quality loss in beer. “As little as 1ppm of oxygen can change the taste and odour of beer,” says Antonello Decortes, Global Product Manager at the company. According to Clariant, a 3.6% loading of CESA ProTect masterbatch successfully held oxygen
74 COMPOUNDING WORLD | November 2019
protect products in transparent PET from changes in appearance, flavour, or nutritional value due to UV light exposure. The trend towards greater use of natural ingredients, which are more sensitive to UV degradation from UV light, has increased the need for such protection, says the company. Opaque and coloured PET can offer good UV protection but these “tend to make the recycle stream dark, which can make recycling more difficult and lessen the value of the reclaimed product,” the company says.
Tacking bacteria Antimicrobials could also—where regulations allow— be used to extend the shelf life of packaged products. Pylote, which has an active packaging antimicrobial-releasing technology, announced regulatory qualification of beverage bottle caps containing its additive. Developed in a partnership with moulding specialist Curtil, the hygienic caps extend shelf-life and are “effective at eliminating the risk of contamination between uses as well as cross contamination between consumers who might share the same beverage,” the two French companies claim. Pylote’s antimicrobial technology uses mineral ceramic microspheres compounded into the polymer.
CLICK ON THE LINKS FOR MORE INFORMATION: �
www.itsfresh.com �
www.ivv.fraunhofer.de �
www.ampacet.com �
www.stabilization-technologies.com �
www.lycusltd.com �
www.tum.de (Technical University of Munich) �
www.basf.com/chemcycling �
www.itene.com �
www.clariant.com �
www.milliken.com �
www.pylote.com
www.compoundingworld.com
PHOTO: CLARIANT
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