could be one of its Baerostab products. The use of a twin-pack approach allows the base
stabilizer product to be supplied as pastilles produced in a melt process – such pastille products are labelled TX by Baerlocher. This means that the main part of the product mix – roughly 80-90% – can be base stabilizer in pastille form for easier storage, conveying and dispersion. Some co-stabilizers are not suitable for melt
processing, so the booster component is typically supplied as a powder or pressed granule. These can be more difficult to handle and dosage of the booster component is sensitive. According to Baerlocher, a twin-pack approach can
be advantageous for plants producing a considerable proportion of brown profiles, particularly if they have accurate dosing systems in the mixing plant and silo storage for the stabilizer. However, in other cases, using two separate one-packs for the brown and white products may be more attractive, as both formulating and materials handling are simplified. Baerlocher also used the PVC Formulation confer-
ence to highlight new stabilizer systems for improved processability. They are available without calcium acetylacetonate to ensure no reddish deposits. The stabilizer systems can be supplied as easy-to-
handle pastilles incorporating processing aids and well-balanced lubricant systems to reduce plate-out. In addition, they use the latest metal soaps to improve dispersion behaviour. Galata Chemicals discussed developments in its
liquid mixed metal stabilizers for flexible PVC formula- tions, such as those used in roofing and membrane applications.
Its new developmental Mark BZ grades meet the
requirements of Reach legislation, while matching or beating the discoloration and transparency perform- ance of grades that are not Reach compliant. In addition, they have been shown to match the latter’s initial colour and colour hold in a variety of transparent and pigmented formulations The company also highlighted the advantages of its Mark OBS grades for plastisol applications. The heavy-metal-free additives provide good initial and middle colour, combined with good long-term ageing properties. In addition, they deliver low odour, VOC, fogging and emission levels. The Mark OBS grades can be used with Galata’s Mark CE boosters to provide excellent initial colour and colour hold. Alternatively they can be applied in combination with its Mark CZ stabilizers with similarly impressive results.
Galata is
developing new liquid
mixed metal
stabilizers for flexible PVC formulations
used in roofing applications
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