March 2004
Additives for Polymers
glass-fibre reinforced polyamides, they also contain suitable synergists. Both flame retardants are characterized by a high comparative tracking index (CTI) of 600 V and low compound density. In contrast to most halogenated flame retardants, Exolit OP products hardly affect the mechanical properties of the compound, Clariant says. Only small amounts are needed to achieve a flame retardant classification of UL 94 V0 or a glow wire flammability index (GWFI) of 960°C. According to Clariant, these amounts are well below those required by other systems, with the exception of red phosphorus.
“UV light can degrade not only the colour but also the flavour and nutritional value of beverages packaged in clear PET bottles. Fruit juices, tea and sports drinks are particularly susceptible”, says Mark Jordan, VP - Marketing at Techmer. Techsperse™ PTM 12125P light inhibitor absorbs the potentially harmful wavelengths of UV and fluorescent light that could affect the beverage’s taste and vitamin content, yet allows the colour of the liquid inside to shine through the PET with undiminished appeal, he says. The UV blocker is specially formulated to minimize haze when processed at temperatures below 550°F (c. 290°C).
Exolit OP 1311 and 1312 are easily dispersible, have good rheological properties, can be easily coloured and are suitable for use for injection moulding. However, the manufacture of complex shapes often requires high temperatures and high injection speeds and Exolit OP 1312 offers a specially stabilized system for polyamide 6.6 that withstands the highest stresses. The main use of this additive is in flameretarded injection mouldings for the electrical and electronic industries, two areas where stringent fire performance standards apply.
While the additive must be limited to loadings of less than 10% to meet FDA requirements, even a 5% level of Techsperse™ PTM 12125P has proved highly effective in tests by Techmer. Depending on how sensitive a product is to UV radiation, lower levels may provide adequate protection against the adverse effects of fluorescent lighting in supermarkets and stores.
Both products are registered in Europe (ELINCS) and in the USA (TSCA), and registration in Japan (METI) is currently in progress. A pilot plant is at present in use at Clariant for product development and commercial introduction. A large-scale plant is under construction at Knapsack, Germany and will be operational by the end of 2004. Contact: Clariant Pigments & Additives Division, Clariant House, Am Unisys-Park 1, D65840 Sulzbach am Taunus, Germany; tel: +496196-757-8132; fax: +49-6196-757-8862; email:
[email protected]; URL: pa.clariant.com
Techmer PM develops new plastics additives To extend the shelf life of beverages in clear PET bottles, colour and additive masterbatch producer Techmer PM has developed Techsperse™ PTM 12125P, a new additive that shields against product degradation from exposure to both UV and fluorescent light.
The company also recently introduced a new polyester non-halogenated flame retardant for fibre and film applications. Techsperse™ PBM12635 is designed for use in PET, PBT or various co-polyester resins. Because flame-retardant fibres and fabrics are in high demand, the new flame retardant was developed to meet UL-94 V-0. For some applications, the new additive can be used at let down ratios as low as 10%, Techmer reports. Available in masterbatch form, Techsperse™ PBM12635 is designed for processing temperatures up to ~285ºC. Contact: Techmer PM, 18747 Laurel Park Road, Rancho Dominguez, CA 90220, USA; tel: +1310-632-9211; fax: +1-310-886-3485; URL: www.techmerpm.com
Anglo-Russian flame retardant development nears commercial production Under a joint development and production agreement, Russia’s Volgograd Chemical Company (Vocco) has been contracted to manufacture UK company Firestop Chemicals’ new Noflan flame retardant at its Volgograd site. The first commercial delivery to the UK is planned for April this year.
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