Abstract
A TECHNOLOGY THAT GENERAL Electric passed on in 1999 has fallen into more appreciative hands. Though the incentives to bring cyclic butylene terephthalate (CBT) to market may have been too small for a high-volume resins maker like GE, CBT will suit Cyclics Corp. just fine as the foundation for a brand new chemical company. The cyclic form of butylene terephthalate comes in a mix of dimer, trimer, and tetramer forms made by breaking down polybutylene terephthalate (PBT). CBT is useful because of its low viscosity when melted. You go from a melt viscosity that is chewing-gum-like to a waterlike viscosity, says John Ciovacco, Cyclics' chief executive officer. After CBT is melted, catalysts are added to CBT to polymerize it during processing back into PBT, which is the ultimate form used in the molded part. This low-viscosity intermediate-step CBT creates an engineering thermoplastic—PBT—that can be used in processes designed for thermoset resins. For example, melted CBT ...
Published Version
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