additives feature | Antioxidants
exterior components such as fenders and bumpers. These products maintain surface properties, while protecting the initial colour and the colour integrity during long-term exposure. Songwon has also developed low-VOC products for
automotive interior components such as instrument panels. Most of the existing commercial applications of these low-VOC systems are in PP-based systems, but tests in HDPE are now underway. Songwon now offers two new enhanced physical
Songwon is now incorpo- rating up to seven ingredi- ents in its one- pack systems
Chemtura’s Weston 705 phosphite recently obtained
EFSA food contact approval for use in all polymers. This has cleared the way for sales of the product in Europe, affording customers a nonyl-phenol-free alternative to TNPP.
Songwon has been developing its Songnox OPS
offerings including its high-heat and high-efficiency ranges. According to Dieter Morath, the key to making one-pack systems more effective is to produce them with low friability and high dispersibility. He says that the target is to produce “granules that can well withstand the harshness of automatic conveying and be easy to disperse.” Songwon now has the capability of manufacturing
effective one-packs that contain up to seven ingredi- ents, versus the three or four ingredients that are most typical of traditional OPS products. “This is mainly relat- ed to our proprietary mixing technology as well as the equipment used to make them,” explains Morath. “We are able to bring various types of ingredients that come in different forms because of the synergistic effects offered by our technology.” Key examples are OPS products tailored specifically
for high-heat PP applications. These one-pack additives allow PP to be injection moulded or extruded specifi- cally for under-the-hood automotive applications. This high-heat range of OPS products for PP is also expected to show performance merits in small appliances where the resulting compounds can replace engineering resins such as PC, says Morath. Also new are OPS products optimized for boosting the UV stability of PP used in thick-section, automotive
28 COMPOUNDING WORLD | April 2012
forms of workhorse phenolic Songnox 1076, which traditionally comes in powder form: Songnox 1076 SB semi beads, 1.5-2.0 mm in size; and 1076 CP crystalline powder. “The latter allows us to match applications in both polyolefins and PVC that require a finer form of the product,” says Morath. Dover Chemical discussed new developments in liquid phosphites at AMI’s Polyolefin Additives 2011 conference. The company’s technical and marketing manager Dr. Michael Davies presented the advantages of the company’s patent-pending LGP-11, alkylphenol- free, high-molecular weight, biodegradable liquid phosphite. He said that the company’s new technology preserves the thermal and hydrolytic stability of phosphites that was previously only obtained through the use of alkylphenols. Positioned as a ‘green alternative’ to typical
commodity phosphites TNPP and SP1, Dover’s LPG-11 “avoids many of the negative perception issues associated with phenolic-based antioxidants,” according to the company. Dr. Davis presented test results for LLDPE formulations that showed that LPG-11 matches or provides better performance than TNPP and SP1 in terms of compatibility, migration control, thermal and hydrolytic stability, plus cast film quality. BASF has expanded its range of UV absorbers with
the introduction of Tinuvin 1600, which is claimed to provide very long-lasting UV protection to high- performance plastics. It belongs to a class of triazines and offers very low volatility, excellent thermal stability and good substrate compatibility in a variety of poly- meric resins, ensuring easy processing. Tinuvin 1600 has been developed to extend the
durability and life expectancy of products under intense exposure to UV light, retaining their mechanical properties, colour and transparency. It can handle long- term outdoor use for up to 20 years, says the company. It is particularly suited to demanding applications in
transparent outdoor plastic sheets, films and other thin-section applications. Target markets include: PC sheets for architectural and automotive glazing applications; biaxially-oriented PET films for photo- voltaics, window films, displays and protective films;
www.compoundingworld.com
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