SMA addition speeds molding of PBT

By: 
April 21, 2009

Plastic additives supplier Sartomer Co. (Exton, PA) says tests have shown that its styrene maleic anhydride (SMA) 1000 can modify the melt flow of polybutadiene terephthalate (PBT) in mixtures, enabling greater flexibility in part design. Adding SMA may lead to thinner, more complex mold designs, more intricate flow paths, and fewer gates.

According to the supplier, SMA does not adversely affect the crystallinity percentage of the PBT, nor are inherent properties compromised, such as dimensional and chemical stability. SMA also increases the brittle point (Tg) and the heat distortion temperature (HDT). Mechanical properties are similar to those of standard PBT. [email protected]

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