thermoplastic elastomers | Innovations
Right: Versaflex VDT from
PolyOne GLS is intended for
over-moulding in markets including consumer electronics
polar functionalities, these products provide excellent adhesion to different substrates, including engineering plastics and polyolefins in over-moulding applications. At NPE 2015 Teknor Apex introduced what it describes as a versatile series of TPEs in its Monprene family for consumer electronics, offering enhanced functionality, pleasing tactile properties, vivid colour, and durability. Target applications include constant-use personal devices like in-ear headphones, computer mice, fitness trackers, and smart watches. All products in the series exhibit resistance to skin
Right: Elas-
tron’s SEBS- based G510 TPE is an
enhanced UV
resistant grade for overmould- ing applications
Tackling UV Elastron in Turkey is a compounder with a broad range of TPEs, including TPVs, SEBS and SBS-based types for automotive and industrial applications. It recently launched the SEBS-based G510 bondable TPE series with enhanced UV resistance for over-moulding onto various thermoplastics, including styrenics, PC, PMMA, PET and PETG. The company says the grades are suitable for both multi-shot and insert moulding processes, and for functional applications that include consumer electronics, personal care items, kitchen tools, household appliances, garden and power tools, medical devices, and miscellaneous soft touch parts. They are available in hardnesses from 40 to 80 Shore A. Another new development from the
company is the permanently antistatic G418 TPE series, providing electrical resistance of 108
Below: Window glass encapsu- lation is a key target market for Kraiburg’s TPE-S High Flow products
ohm independent of humid- ity.
Typical target applications include hospital clogs, indus- trial wheels, and electronic equipment components. The materials are said to bond to polyolefins, provide good surface appearance, are non-blooming and are easy to colour. Dynasol has developed a new generation of func- tionalised SEBS TPEs. It says grades in the new Calprene family are functionalised with maleic anhy- dride or glycidyl methacrylate to offer excellent adhesion, better performance at lower temperatures, and improved UV and hydrolytic stability. Principal applications are in coatings, adhesives and sealants, but they are also suitable for polymer modification.
Dyne 131F-MA-1 is a 70/30 SEBS copolymer functionalised with maleic anhydride. Dyne 131F- GMA-5 is a 70/30 SEBS functionalized with glycidyl methacrylate. Dynasol says that, due to the presence of
46 INJECTION WORLD | April 2015
oil, stains, household chemicals, and UV and are free of latex, phthalates, BPA, and heavy metals. Grades for over-moulding show excellent adhesion to polycarbon- ate, ABS, and PC/ABS. Various surface properties— from plastic-like to rubbery, silky smooth to “grippy” and glossy to matt—are possible. PolyOne GLS used NPE to launch its Versaflex VDT thermoplastic elastomers, said to be developed for over-moulded vibration and impact damping applica- tions such as required in consumer electronics, power tools, sporting goods, appliances, and the like. Bonding to polycarbonate, nylon and other polymers is
said to be “excellent.” “Versaflex VDT over-moulding grades deliver the same great vibration and impact damping
performance as the original Versaflex VDT technology, exceeding most thermoset solutions while offering the
advantage of thermoplastic design flexibility,” the company says. “Additionally, the PolyOne GLS material is more cost-effective than self-adhesive vibration damping tapes and avoids secondary operations.” Grades are available in 40 - 60 Shore A hardness levels, opaque and colourable.
TPU innovations TPE developments are not restricted to the TPE-S and TPV sectors, however. Bayer MaterialScience’s Desmopan 600 series of polyether thermoplastic polyurethanes (TPUs) are claimed to provide “unusually good” adhesion on polyamide 6 and 66 (with and without glass fibre reinforcement). They also bond well to other hard thermoplastics, such as polycarbonate and PC/ABS blends. The 600 series uses polyethers based on C3
monomer. BMS says the grades are suitable for applications requiring the excellent hydrolytic and microbial resistance of its Desmopan 900 series (based on C4 polyether) but not the high-level mechanical properties. One objective in developing the 600 series was to provide alternatives to TPEs based on styrene block copolymers and olefins (TPE-S and TPE-V) – com- pression set, tear propagation resistance and elasticity
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