Hoechst Celanese improved PET

I ran across this article while researching PET modification:
http://www.memagazine.org/backissues/may98/marketplace/tech_focus/techfocus2.html
Summary: The Ticona Division of Hoechst Celanese Corp has developed a modified PET which exhibits lower viscosity when molten, higher resilience at low temperatures, and generally more ductile failure modes.
This article was originally from 1998, but I can't find much else about this modification. There is mention in the article about a 15% glass content, but is glass alone sufficient to provide these enhanced qualities? Does anyone know what HCC used to make this product (Impet Hi 430)?
Thanks in advance, -- TTK
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