PPG Industries. USA

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Czok and Guiochon (18) examined a column prepared from well-aligned fibers made from porous glass obtained from PPG Industries, USA. The dense packing of the fibm leads to a very low interstitial fraction, 9% compared to 40% for a packed bed. If the fibers are 75% porous, one will find a ratio of pore volume to interstitial volume of about 7.5. The same ratio for a packed bed of equally porous particles would yield a ratio of about 1.1. One can see the potential advantage of the bed of fibers. Unfortunately, one can also predict that the low interstitial fraction will result in a low permeability. The efficiency of such a device cannot be predicted a priori, but the results reported were poor. We will discuss this device more in the following section, in which we deal with the evaluation of these alternatives to packed beds. 

This work was carried out in support of the research efforts of PPG Industries, Inc., Monroeville Technical Center, Pennsylvania, USA. I wish to thank Denise Callahan and Audrey Anderson of the library staff and Vicki Potter formerly of the secretarial staff for their assistance and Dick Obrycki and Singh Manocha, Heads of the Analytical Departments, and Dave McKeough, Research Director, for their support. 

PPG Industries Inc., Chemicals Group - Technical Centre, 440 College Park Drive, Monroeville, PA 15146, USA... 

Figure 2.58. Surface flatting mechanism by precipitated silica, Lo-Vel HSF. Left - distribution of agglomerates, right - surface roughness of coating. Courtesy of PPG Industries, Inc., Pittsburgh, PA, USA.

Present address PPG Industries Inc., Coatings Innovation Center, 4325 Rosanna Drive, Allison Park, PA 15101, USA. 

Anderson, L. G., et al. (2000). Thermosetting compositions containing carbamate-functional polymers prepared by atom-transfer radical polymerization and coatings therefrom. In PCT Int. Appl. WO 0012566, PPG Industries Ohio, Inc., USA, 59 pp. 

Coca, S., and O Dwyer, J. B. (2002). Pigment dispersions containing dispersants having core and arm star architecture prepared by controlled radical polymerization. In US 6336966, PPG Industries Ohio, Inc., USA, 18 pp. 

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