ADDITIVES | ANTIOXIDANTS AND STABILISERS
BASF’s Irgastab gets straight to the point
With the rollout of Covid-19 vaccinations worldwide, demand for PP syringes has increased hugely. Korea’s Lotte Chemical is supply- ing a PP grade for a South Korean manufacturer of LDS syringes using BASF’s Irgastab non-discolouring stabiliser. LDS (low dead space) syringes minimise the amount of a drug or vaccine left in the device after injection, leading to reduced wastage. Plastics used for medical applications require sterilisation, which can cause degradation and discoloration. “Irgastab serves to ensure that medical PP remains safe and suitable for use,” says Hermann Althoff, Senior Vice President, Performance Chemicals Asia Pacific, BASF. �
www.lottechem.com �
www.basf.com
applied in thin film applications where convention- al UV absorbers have proven difficult to employ due to blooming and agglomeration issues,” the company says. “Particularly in displays for televisions, smart- phones and tablet PCs, where thin-film technology has progressed rapidly in recent years, UV rays over 380nm must be cut off to protect the polarizer or light emitting elements, which are sensitive to photo-degradation from exposure to daylight or strong light from a display backlight. LA-F70 is ideally suited for such applications,” Adeka says. The company adds that the good blue light cut-off function of LA-F70 can also be exploited in protective films and containers for such products as pharmaceuticals and dyes. LA-F70 is recommended primarily for transparent
resins such as PMMA and PET, although its high heat resistance also makes it suitable for use in other polymers that require processing temperatures up
LDS syringes reduce vaccine wastage so are in high demand
to 300°C. “This superior heat resistance is also expected to reduce contamination and plate-out on processing equipment,” the company says. ADK Stab LA-46 has high UV absorbance in the 280 to 300nm wavelength region. It is recommend- ed for applications calling for stringent colour requirements since the degree of initial discolora- tion during processing is low. It also has a relatively low absorption in the visible region above 400nm and low propensity to chelate to metal ions. Masterbatch maker Ampacet has introduced
ThermProtect PET, a range of rPET stabilising masterbatches that reduce yellowing due to polymer thermal degradation, enabling processors to increase the content of recycled PET in virgin material without compromising product aesthetics or performance. PET is by far the most recycled plastic packaging
material in Europe. However, repetitive heating of rPET induces thermal degradation, impacting the material’s intrinsic viscosity and leading to yellow- ing, which affects the aesthetics and properties of the packaging. “The introduction of ThermProtect PET enables increased use of rPET without compro- mising on product appearance and quality,” says Ampacet.
Figure 8: Transmittance of transparent resin film containing ADK Stab LA-F70 (100µm thickness) compared to a non-stabilised product Source: Adeka
90 COMPOUNDING WORLD | September 2021
CLICK ON THE LINKS FOR MORE INFORMATION: �
www.doverchem.com �
www.sumitomo-chem.co.jp �
www.brueggemann.com �
www.clariant.com �
https://www.baerlocher.com �
www.byk.com �
www.solvay.com �
www.unitechem.eu �
www.rianlon.com �
www.adeka.co.jp �
www.ampacet.com
www.compoundingworld.com
IMAGE: BASF
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