Pont Co

Perfluoroepoxid.es were first prepared ia the late 1950s by Du Pont Co. Subsequent work on these compounds has taken place throughout the world and is the subject of a number of reviews (1 5). The main use of these epoxides is as intermediates in the preparation of other fluorinated monomers. Although the polymerisation of the epoxides has been described (6—12), the resulting homopolymers and their derivatives are not significant commercial products. Almost all the work on perfluoroepoxides has been with three compounds tetrafluoroethylene oxide (TFEO), hexafluoropropylene oxide (HFPO), and perfluoroisobutylene oxide (PIBO). Most of this work has dealt with HFPO, the most versatile and by far the most valuable of this class of materials (4). 

Materials of this type have been sold by Du Pont Co. under the Freon E and Krytox trademarks. Perfluorinated materials stmcturaEy similar to those in equation 11 have been prepared by Ausimont by the low temperature irradiation of either hexafluoropropylene or tetrafluoroethylene with oxygen followed by heating and/or irradiation and have been sold as Fomblin Hquids (52). An isomeric polyether, Demnum, prepared by the oligomerization of 2,2,3,3-tetrafluorooxetane followed by fluorination has been commercialized by Daikin (eq. 12). 

Du Pont Co., Scientific Computing Division, Experimental Station, Wilmington, Del., 1988. 

Fig. 5. Typical effect of moisture on PVB adhesion A, pummel data (—20°C) from Monsanto Co. B, compressive shear data from Du Pont Co. To...

General Electric Co. Halocarbon Products Corp. Du Pont Co. 

The trans-1,4 configuration predominates but there are also small amounts of the three other isomeric stmctures, ie, cis-1,4, -1,2, and -3,4. It was one of the first synthetic mbbers produced in the United States as early as 1931, by the Du Pont Co., because of its good solvent resistance. Its Du Pont trade name is neoprene. Even though it is not as solvent resistant as nitrile mbber, it has many other advantageous properties (see Elastomers,... 

More recendy, Du Pont Co. has commercialized a new family of copolymers of just ethylene and methyl acrylate, where the cure-site monomer has been removed from the polymer backbone. 

Du Pont Co. conformal coatings, photoresists, manufacturing aids, electronic functional coating compounds... 

Acknowledgment is made to E. P. Kyba (University of Texas) for noting that this crown can be distilled and to E. R, Wonchoba (Du Pont Co.) for helpful comments. 

Footnotes (a) Gaskets are also available in other materials, such as hydrogenated nitrile, neoprene, butyl rubber, hypalon, silicon rubber to meet various application requirrnents. (b) Viton is a Du Pont Co. trademark for a series of fluoroelastotners based on the copolymer ofvinylidene fluoride and hexafluoropropylene. 

The checkers had n-bromobenzenediazon ium hexafluoro-phosphate examined in laboratories of the Du Pont Co. Explosives Department to see if it could be detonated. It was found sensitive to neither shock nor static electricity, and to decompose but not detonate when rapidly heated to 250°. Hence it probably does not present an explosion hazard, but it should be kept away from heat, especially if in a closed container. 

The EPDM used in this work is Nordel 2722, manufactured by the Du Pont Co. 

This name has been widely adopted for the elastomer obtained by polymerising chloroprene, i.e., polychloroprene. It is however the trade name of those types of polychloroprene produced by the Du Pont Co.which were originally called Duprene . Chloroprene rubber (CR) is the preferred term, but polychloroprene (PCP) is also popular. 

In 1972, when the main thrust for these then-new materials was the development of efficient polymer membranes for chlor-alkali cells, the F. I. du Pont Co. reported much information, mostly in the form of product literature, in the form of empirical equations regarding the water mass and volume uptake of sulfonate form Nafion as a function of FW (in the range 1000—1400), some alkali metal counterion... 

Cardox is a device for breaking coal in gaseous mines by the pressure produced on heating liquefied carbon dioxide. It is briefly described in Vol 2 of Encycl, p C67-R. Similar devices, Airdox and Armstrong Air Breaker, were developed in. 1930 in the US. More successful were Hydrox developed in 1955 and Chemecol developed by du Pont Co before 1958. They are also Hydraulic Coal Bursters (See Vol 3 of Encycl, p C434)... 

American railroads refused to transport Dynamites until. duPont Co proved to them in winter of 1885—86 that it can be safely transported. In 1886 the da Pont Co in col-... 

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