ADDITIVES | ANTIOXIDANTS AND STABILISERS
Figure 1: Spider chart showing performance of SI Group’s new Lowinox S225 antioxidant in PP compared to a current benchmark
Source: SI Group
Figure 2: Yellowness Index results of Ultranox LC PP701 in homopolymer PP for BOPP film compared to a DHT control Source: SI Group
maintenance and operational costs while providing excellent protection against gel formation during polymer extrusion and recycling,” says Irfaan Foster, SI Group Market Development Director. Weston 705 masterbatch has already been
extensively tested in commercial production and recycling of power stretch wrap film where, according to the company, it contributes to significant reductions in gels — 7.5 times fewer — in virgin and PIR-rich stretch film formulations while improving some critical film properties. It will also reduce gel levels in polyolefin PCR streams. Foster says the masterbatch can be tailored to specific application needs with the addition of other additive chemistries from its portfolio. Another new development is the Ultranox LC
Below: SI Group is now offering its Weston 705 stabiliser in a masterbatch form for polyolefin applications
(Low Colour) platform of phosphite-containing additives for various polyolefin applications. It includes Ultranox LC PP501 and Ultranox LC PP701, both of which uses patented colour protection packages that Foster says contain all of the required components to produce fully formulated resins. Ultranox LC PP501 is intended for fibre resins and includes a stearate for fibre lubricity and to provide what the company describes as “a touch of static control.” Significantly improved colour
control will be noticeable from extrusion through to the end use applications, according to Foster. Ultranox LC PP701 contains all the needed
stabilisation components to produce a fully formulated BOPP resin. Yellowness Index results show a marked improvement in multiple pass extrusion tests against a DHT control (Figure 2). It is stearate-free, which is said to simplify the applica- tion of surface treatments on the film. The Ultranox LC platform also minimises gas fading issues relative to traditional antioxidant systems, according to SI Group, and melt Flow Rate (MFR) control is said to be excellent. Ultranox, products, like Lowinox grades, contain multiple chemistries: phenolic, phosphite and thioester, depending on the product, says Foster.
UV-C stabilisation A new stabilisation technology has been developed by Solvay for use in demanding hygiene applications where polyolefin surfaces are treated with ultraviolet light in the UV-C spectrum (200-280 nm) to prevent bacteria and viruses from spreading further. “Disinfection continues to be a topic of high
importance, whether it is in the fight against hospital-acquired infections, antibiotic resistant bacteria or viruses that are continually mutating,” says Andrea Landuzzi, Global Marketing Director for Polymer Additives at the company. “UV-C radiation is a known disinfectant for air,
water and surfaces,” he says. “It has been used effectively for decades in certain applications to deactivate and reduce the transmission of harmful microorganisms. This high disinfection efficiency is driving wider implementation of UV-C technology across many industries such as healthcare, shared mobility, aviation, automotive, furniture/furnishings,
66 COMPOUNDING WORLD | September 2022
www.compoundingworld.com
IMAGE: SI GROUP
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