ADDITIVES | PROCESSING AIDS
its product line is not bio-based. It introduced its Struktol V-Wax E and V-Wax OP additives some while back, describing them as refined, organic wax products designed as substitutes for montan E and OP waxes (respectively ester and partially saponified types). The company says its products provide equivalent processing and performance in a variety of applications, while their chemical composition meets current specifications for montan waxes (Figure 4, page 66). These alternatives are aimed primarily
Above: Clariant’s Licocare RBW high perfor- mance waxes are derived from rice bran oil by-products
largely – and in some cases fully – on natural fats and oils. The company’s portfolio is slanted towards lubricants, plasticisers and surface finish agents and it says it is constantly refining its Green Polymer Additives product portfolio to exceed today’s increasingly stringent standards and regulations. Emery’s Loxiol brand was launched in 1957. The long established lubricant products are said to be compatible with various stabilisers. Loxiol G59, for example, improves material flow during extrusion and reduces melt viscosity. It also has food contact approval and is suitable for transparent applica- tions. The grade is compatible with several poly- mers and is said to reduce the formation of deposits (blooming) on the final article as well as on processing equipment (plate-out). Loxiol G24 is an external lubricant and release agent that is based on 100% renewable resources. It is said to be a suitable replacement for paraffin and Fischer- Tropsch waxes. The latest developments from Emery include
Right: C-PVC pipes are a target applica- tion for Emery’s latest bio- based ester lubricants
tailored bio-based ester lubricants for processing of chlorinated PVC (C-PVC). Among the claimed advantages for the products are a minor influence on the Vicat softening point and a defined chemi- cal structure similar to the often-used paraffin waxes. The lubricants also enable an exact adjust- ment of the processing window, according to Dr Harald Klein, Global Platform Head of Emery Oleochemicals’ Green Polymer Additives business unit. Other developments include food contact compliant additives that adhere to the respective regulations in all major regions worldwide.
More alternatives Struktol is also producing alternatives to montan waxes (which it sells but does not manufacture) but
64 COMPOUNDING WORLD | April 2018
www.compoundingworld.com
at calendered PVC sheet for blister packaging. Other applications include lubricants and release agents for polyolefins, polyamides, thermoplastic polyesters, polyurethanes, and thermosets. Struktol says that in calendered, clear rigid PVC applications Struktol V-Wax E and V-Wax OP have been shown
to provide identical processing characteristics and metal roll release properties that have historically been provided only by montan waxes. In addition, no noticeable change in clarity is observed.
Supply considerations Michael Fulmer, Vice President Plastics and WPC at Struktol, says supply issues with montan waxes have eased since the V-Wax products were introduced, but he says a new phase of uncertain availability could be on the horizon. “Companies that have done their due diligence with our alterna- tives will be well set to take advantage,” he says. More recently, the company has been focusing on a lubrication technology developed in-house to enable production of masterbatches and com- pounds – mostly but not exclusively based on
PHOTO: CLARIANT
PHOTO: EMERY OLEOCHEMICALS
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