ADDITIVES | PVC
Figure 1: Brabender chips for a Therm-Chek Ca/Zn organic based stabiliser developed as a tin offset for substrate formulations. The Ca/Zn powder system (right) shows the early colour that tin stabilisers are known for along with improved mid-term colour and no loss of processability. Left column shows time in minutes
Source: Valtris
ings or artificial leather applications in public transportation, car sharing, public spaces, hotels, hospitals, etc. As such, the customer also requested the biocide additive in soft PVC as a product characteristic to stand out from the competition.”
Tackling shortages Brenda Hollo, Business Director, Stabilizers, at Valtris Specialty Chemicals, also highlights the difficult conditions brought on by the pandemic. “2021 has also been an unprecedented year for raw material shortages, which has affected almost every industry, including PVC,” she says. As one example, she says that a shortage of the preferred tin stabilis- ers in North America has led to an increased interest in calcium/zinc (Ca/Zn) technology. “Valtris has worked with its customers to develop creative solutions to keep production lines up and running. Ca/Zn based stabilisers are an offset to tin stabilisers in both pipe and substrate formulations.” Perfor- mance of one example system is shown in Figure 1. Valtris offers a complete line of non-toxic and
Figure 2: Reduction of VOCs through conversion from liquid Therm- Chek stabilisers (VT 287L and VT 300L) to a powder Therm-Chek alternative (VT 218P) in heavily filled LVT base layer formulations Source: Valtris
heavy-metal-free stabilisers for PVC, with a strong focus on stabilisers for the flooring industry, including luxury vinyl tiles (LVTs). Hollo says they are designed to meet ever-changing regulatory needs, helping customers to satisfy indoor air quality certifications and produce products that are SVHC-free while meeting performance targets. Grades include Ca/Zn powders and liquids free of barium, which can be formulated to be ultra-low and phenol-free. Recent developments from the company for LVT flooring applications include Therm-Chek VT 328L and VT 329P, which are liquid and powder stabilis- ers respectively. They are said to provide outstand- ing heat stability while at the same time maintain- ing the very good clarity required for clear wear-layer applications. Therm-Chek powder stabiliser products have been designed for heavily-filled base layers in LVT
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