Document wgn4wOZdbb293mDwL8MyVyaGV

INTRA-ORGANIZATION MEMORANDUM PLAINTIFF'S EXHIBIT BOND-360 FROM Julius Nemeth XO__________ Doug Wood_________ DATE_______ October 24. 1974 Always provide address to which reply is to be sent .SUBJECT. Please use' a separate sheet for each subject treated Dear Doug: j Harshaw Chemical continues to get good publicity on their special material for de-dusting powdery materials--ad/attached hereto the most recent ex ample. What if any further developments do we have to indicate this might be of help to us in the plant? / Cordially yours, JKN/tw October 30, 1974 Dear Julius: / / I suppose I should/have been more specific as to why we could not use the Harshaw Chemical ^material "Teflon K". Returning your article with the paragraph blocked in that indicates the reason why; and, that is, of course, because we cannot bring our mixing temperature up to 100 degrees. The sample of our product ^Bondex was sent to Harshaw and they could indeed de-dus't it but only at higher temperatures than we are able to obtain, rf Best regards. BON - 00935 Powdery Materials "De-Dusted" By Microscopic Fibers P owdery materials become essen tially dustless when treated with a new process developed by Harshaw Chemi cal Co., Division of Kewanee Oil Co., Cleveland, Ohio. Experiments have proven the technology successful when applied to more than 150 types of powdery material, including dry color ants, powdered metals, toxic powders and other organic and,inorganic dusty powders. The process is unique in that it nei ther coats the product nor does it add such reactive materials as oils, humectants or surfactants. Most importantly, the process does not generally change the physical or chemical properties of treated material. The technology is quite simple and adaptable to most powders and plant processes. It offers a method to make saleable products out of materials that previously have had to be discarded as unusable fines. The process is full of surprises. Ex ample: The dust is held by a web that is formed within the powder from submicroscopic fibers of unsintered polytetrafluoroethylene (PTFE). Some dust is held within the web as if caged, and other particles adhere to the web itself, even though PTFE is generally consid ered slippery. Specially Developed Not all PTFE will work, so Du Pont has developed "Teflon K" particle control additives specifically for this process. Commercial availability of the new family of materials has been an nounced. With proper treatment, powders are loosely held in the fiber-web. Vigorous handling can cause powders to be made dusty again, but it is this weak agglomeration that makes the de dusted powders dispersible and other wise normally useful. 48 Another surprise is the small quan tity of `Teflon K." commonly required: only 0.1 per cent down to perhaps 0.005 per cent. These small quantities would range from, two pounds to one- tenth of a pound of additive in a ton of powder: More must be done, however, than to simply add Teflon K. to the dusty powder; the mixture must be "worked" to make the web of fibers. This work ing step applies a compressive shear to the mixture while it is heated. "Work ing" at the laboratory level is a troweling or smearing action, such as by a spatula or a gentle mortar-pestle action. In the plant, mullers, ball mills, slow-turning mixers or blenders, screw conveyors, spray driers and many more devices will do some or all of the fibrillation. 1 he mixture muSt 05 41 least warm, and generally it is best to start the first tests at lOO^C. At this temperature, the Teflon K in most mixtures will fibrillate in a few minutes, or perhaps only a few seconds, if the concentra tion of Teflon K is sufficient and the working action is correct. The process has been granted broad patent coverage and patents will be published and available shortly. There fore, Harshaw now offers Harshaw Dustless Process technology for li cense. The process is entirely Harshaw's. In much of the world, however, Du Pont is licensing the technology on behalf of Harshaw. Harshaw is li censing the process in the United States and Canada. Both Harshaw and Du Pont have people trained to assist those working on applications of the process. In addition to decreasing dust con tent, or eliminating dust from prod ucts, the process offers other potential benefits including: lower yield loss; prevention, of cross contamination of dusty products; improvement of inplant atmosphere, which in turn minimizes inhalation,, fire and explo sion hazards; lower costs through reduction of clean-up time, clean-up cost and handling loss; increased prof its from the sale of dustless products that are worth more to potential cus tomers. BON - 00936 paint ano varnish production. October 1974 Circle No. 16 on Inquiry Card