Materials (March 01, 2004)

Polycarbonate copolymer has better low-temperature impact strength

Two new grades of GE Advanced Materials’ toughened polycarbonate/siloxane resin, Lexan EXL, are a strong fit for use in portable electronics, telecommunications and hand held computer applications. Lexan EXL 9112 and Lexan EXL 1434 provide various levels of flame retardancy that help address eco-label needs along with high flow, broad chemical resistance and enhanced weatherability.

Through the use of proprietary siloxane copolymer technology, the Lexan EXL resins have retained the properties of polycarbonate, while extending low-temperature impact strength and cold-temperature ductility. The siloxane softblock in the polycarbonate backbone also imparts improved UV stability.

Lexan EXL 9112 is currently the highest-flow, UL 5VA flame-retardant product in GE’s Lexan portfolio.

GE Polymerland Canada 800-752-7842

Super-soft TPVs now available

The Uniprene series of compounds is the softest line of TPV compounds on the market. Compared with the softest conventional TPVs, which are rated about 45 Shore A, three grades in the new Uniprene 2000 series have durometer rating of 15, 25 and 35 Shore A. “Until now, manufacturers who needed exceptional softness in applications like grips, gaskets and weatherstripping were limited to non-crosslinked TPEs, such as those based on styrene block copolymers,” says Keith Saunders, program manager at Teknor Apex. “The new Uniprene compounds not only provide comparable softness, but perform better at elevated temperatures.”

Saunders reports that the Uniprene 2000 series also provide greater resistance to oils and solvents, improved abrasion resistance and a sifter, dryer feel compared to other TPEs of similar hardness.

Teknor Apex 401-725-8000