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Innovative
Chemistry Includes
Unique Two-Phase Cross Linking
Manufacturing News Center
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INSIGHT: Development of Uniprene XL compounds was described
in a paper delivered at Antec
2004 by Teknor Apex scientists.
Conventional TPVs, including standard Uniprene grades developed and
sold by Teknor Apex, typically consist of EPDM rubber domains dispersed
in a polypropylene (PP) matrix, with cross linking of the EPDM providing
more rubber-like properties than are available with thermoplastic elastomer
blends not subjected to cross linking. In developing Uniprene XL compounds,
Teknor Apex replaced EPDM with a modified hydrogenated styrene block
copolymer (HSBC).
One of the scientists provided insight into the process; "As with
conventional TPVs, the ‘soft segment’ of Uniprene XL compounds takes
the form of spherical, micro-sized [0.5- to 2.0-micron] domains of cross
linked rubber,” “Within the soft-segment domains of cross linked HSBC,
however, are nano-sized domains consisting of polystyrene hard segments
that also act as cross links [see illustration]. It is this dual-network
morphology that provides the long-term compression set consistency and
solvent resistance that distinguish Uniprene XL TPVs.”
Other high-performance TPVs on the market are based on nylon/polyacrylate,
nylon/silicone, and copolyester elastomer formulations. While prices
for these engineering TPVs range up to (USD) $10.00 a pound, Teknor
Apex expects to offer Uniprene XL compounds at selling prices which
are substantially lower.
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Teknor Apex Company is an international custom compounder of plastics
and rubber materials covering the entire spectrum of polymers including
polyethylene, polypropylene, polystryene, ABS, engineering thermoplastics,
PVC and TPEs as well as colorants for the plastics industry worldwide.
(www.teknorapex.com) (info@teknorapex.com) (info@teknorcolor.com)
As reported by Jobwerx News
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information on innovative chemistry, Uniprene
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styrene block copolymer, solvent resistance, copolyester elastomer formulations
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