additives feature | PVC stabilizers
one-component system for simplified handling. It contains the stabilizers plus high-sensitivity colour improvers.
Chemson was acquired in November last year by the
Oyak Group which also owns Akdeniz. Together the companies claim to be the world market leading in PVC stabilizers.
Sunshades are a target application for Baerlocher’s stabilizers that protect against microbiological degradation
and moulded fittings, he explains, because lacking zinc in their chemistry, there is no rapid thermal degrada- tion in profiles caused by the catalytic effect of a zinc component. In its development of suitable lead-free additives, Reagens revamped the formulations of PVC com- pounds. Among the features that resulted from this clean-slate approach are “tangible cost-performance benefits versus lead technology”, he says. Other additive grades include Reapak G-AV/2594/3
for profiles, an “AcAc-free” stabilizer (so called because it does not contain acetyl-acetonate co-stabilizers). Its benefits include minimising corrosion in processing equipment and, consequently, “the unpleasant red discoloration of processing water during extrusion,” caused by acetyl-acetone residue interacting with metal. Reagens continues to work on COS systems. Berna says that one advantage of the materials is their complexity. “In most cases, formulations are tailor- made for individual converters,” he said. Chemson has also recently developed an AcAc-free
CaZn stabilizing system. It presented data on the new system at the PVC Formulation 2014 conference. This showed that processability and performance closely matched standard CaZn grades containing AcAc. In addition, the company also presented its latest HMF heavy-metal-free system that cuts Zn and is also AcAc free. Test results produced in conjunction with Vestolit showed that this additive also closely matched the processability and mechanical properties achieved with a standard CaZn product – the throughput was actually slightly higher. Chemson has also developed new tablet systems for demanding window profile applications. The established approach involves a basic stabilizer tablet plus a booster in granule or tablet form. Its latest product is a
58 COMPOUNDING WORLD | June 2014
Liquid options Another leading producer of PVC stabilizers, Baerlocher has recently launched innovative liquid mixed metal stabilizers for PVC coatings that are designed to protect against microbiological degradation. The new stabilizers – named Baerostab UBZ 635 XLP RF and Baerostab UBZ 782 XLP RF – trigger a chemical challenge associated with dichloroctylthiazolinon (DCOIT). This enables the manufacture of PVC products that comply with the latest EU regulations on biocides. Target applications include sunshades, truck
tarpaulins, architectural textiles and textile coatings where the additive helps to prevent product degradation through biological effects caused by fungus, mould and microorganisms. While DCOIT meets the latest EU biocides regula-
tions, it can lead to undesirable chemical reactions with the components of standard stabilizers reducing their efficiency. The new liquid mixed metal stabilizers developed by Baerlocher are compatible with DCOIT, therefore avoiding this undesirable chemical reaction. This means they can be dosed in the same way as previous systems that have been phased out by the regulations. “The development team of Baerlocher is committed
to provide our customers with highly innovative stabilizer solutions to ensure compliance with latest industry requirements, legal regulations and poli- cies,” says Dr Stefan Fokken, the company’s head of research & development.
More information The next PVC Formulation conference is being held in Cologne, Germany on 16-18 March. For information on participating in the event as a delegate, exhibitor, sponsor or speaker, please visit
http://bit.ly/PVCF2015.
Click on the links for more information: ❙
www.vinylplus.eu ❙
www.galatachemicals.com ❙
www.pmc-group.com ❙
www.reagens.it ❙
www.chemson.com ❙
www.akdenizkimya.com.tr ❙
www.baerlocher.com
www.compoundingworld.com
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