HAMMOND GROUP

When Hammond and co-workers(59) found that the intersystem crossing quantum yield for aromatic ketones was unity (see Chapter 3) it was a short but very important step to realize that these compounds should be ideal triplet sensitizers. Thus one can excite the triplet state of molecules that otherwise would be formed inefficiently, if at all, by intersystem crossing. This idea resulted in a number of papers in the early 1960 s from the Hammond group on this topic. It is not possible in this short section to survey this area, but a few of the early studies are indicated by the following reactions ... 

Hammond Expanders Division of Hammond Group, Inc., Hawker Energy Products, Inc., Bipolar Power Corporation, ALABC Project B-0008.5, Development of new expander for the VRLA battery in electric vehicle applications. Final Report 1 July 1997 to 30 June 1999, Advanced Lead-Acid Battery Consortium, Research Triangle Park, NC, USA, 1999. 

Manuf./Disiri). Aldrich Eluka Halstab Hammond Group Spectrum Qual-ily Prods. 

Manuf./Distrib. Aldrich Atlantic Equip. Engrs. Hammond Group Omni Oxide Ruger Spectrum Quality Prods. 

ManufJDistrib. ABCR Acres Org. Aldrich Alfa Aesar Asarco Atlantic Equip. Engrs. Fisher Scientific Fluka GES Gelest Hammond Group ICN Biomed. Research Prods. J.T. Baker Landers-Segal Color Mallinckrodt Baker Nichem Noah Omni Oxide Pfaltz Bauer Riedel-deHaen Ruger Sigma Soltec Ventures Spectrum Ouality Prods. Stanchem Strem Chems. 

Manuf./Distrib. Aldrich http //www.sigma-aldrich.com, Fluka http //www.sigma-aldrich.com, Halstab http //www.haistab.com, Hammond Group http //www.hmndgroup.com. Spectrum Quality Prods. http //www.spectrumchemicai.com Trade Name Synonyms Halcarb 20 [Halstab http //www.haistab.com], Halcarb 20 EP [Halstab http //www.haistab.com], Halcarb 200 [Halstab http //www.haistab.com], Halcarb 200 EP [Halstab http //www.haistab.com], Naftovin T2 [Chemson Ltd http //www.chemson.co.uk]... 

Hammond Group http //www.hmndgroup.com] ICN Biomed. Research Prods. http //www.icnbiomed.com] J.T. Baker http //www.Jtbaker.com] Landers-Segal Color http //www.pigments.com] Mallinckrodt Baker... 

The Hammond Group, which includes the Halstab heat stabiliser division, has purchased OM s PVC stabiliser business, except for OM s business in Thailand. 

Hal-Lub, Lubricants (metallic stearates), Halstab Div., Hammond Group, Inc. 

Another factor involved in discoloration, in this case of objects in contact with wood fiber composites, is tannin stain. Tannins are complex phenoUc compounds produced by trees as biocides therefore, the level found in wood fiber is variable. Air oxidation leads to dark-colored quinine-containing products that are water-soluble and which stain textiles, paints and coatings. Tannins can be complexed by aluminum salts to prevent surface migration. Products are sold by Halox Div., Hammond Group, under the tradename Xtain . ... 

---