Document YjNQGXNbj9vO90R35ZDG16N50

/ c CCs J. B, Bullitt, Wiira. D. McBurney, Wito. F, H* Beadles, Wilm, G. T. Vaala, Wilm. H. R. Young, Wilm. P. H. Holmberg, Wilm. 0. H, Bullitt, Exp. Sta.,Wilm, R. E, Thomas, Newburgh J. D* Pickens, Flint MgMQRAHDDM REPORT HO, M-750 PREPARED BYs . A. HALL Indexed R. B. Davis, Lab B. Morgan, " P. Robinson, " P. B. Evans, *' W. Do Lawson, " D, L. Herndon, " K. 0, Lamport, E. R, Taylor, " Library (5) " Patent Section,' Files 1810 Marshall Laboratory January 10, 195,5 INDEXED" BSfCE COPY mr GRASSELLI CHEMICALS DEPARTMP XMTRODIJCTXONi The writer attended a meeting of. GrasselXI and F & F representatives in Wilmington on January 4, Present for Grasselli were B. C. Nylen, A,, D. Johnson, F. E Mask, P,, F, Hoglund, and T, J, Armstrongs for P & P, G. X. Vaala, P. H. Holmberg, J B Bullitt, D MeEurney, F. H. Beadles, H. R, Young, and W A. Hall SIMffiYs Subjects-discussed were (1} "Ludox" Colloidal Silica as an agent for \a) soiling resistance, and (fe) improving the scrub resistance of latex-based paints? {2} rtVelronM Hydrophobic Silica as an agent for soil and water resistance. ACTION; 1 ** W. A. Hall will continue current work on soil-resistant preparations, and will expand it from pile fabrics to smooth sub strates 2 ~ w, .A, Hall will work on incorporating "l&dcec" in a mag cleaner. 3 ~ W. A, Hall will study addition of "Voiron'1 to polishes and cleaners. 4 Research Division will re-evaluate "Ludox" in latexbased paints. 3 Newburgh*s attention is directed to the potential value of "Ludtox5* as a oil-resistanb treatment for fabrics i DISCUSSION; -2- 1 - Soil Resistance of "Ludox** Mr. Armstrong reported and demonstrated that "Ludo%" imparts soil-resistance to pile fabrics, rugs and carpets in particular, to upholstery fabrics especially in the automotive field, to wallpaper, wall paints, and curtain fabrics. Numerous other substrates were discussed as potential subject for this treatment including leather, coated fabrics, window shades and book coverings. "Ludox" may be applied by.spray gun, aerosol, roller, immersion or exhausting from a bath. When sprayed or rolled, the preferred amount applied is 3$ silica solids on the pile weight for rugs and carpets, which amounts to dampening the surface with "Ludox" diluted to 3^ silica solids. Softeners may be added to alter the hand if desired$ "Avifcex" W and Apeosol 100 are suggested, at l/k% on the 3% solution. One pint of 3$ silica solids solution will deposit 1/2 ounce of silica per square yard on pile carpets at a raw material cost not exceeding. 1-1/2 cents. For exhaust treatment, the preferred deposit is 1% silica solids plus 1% aluminum sulfate on the weight of the fabric. Several firms have offered other sols in competition with "Ludox", including a colloidal, stannate and colloidal titania, but all are reported to be distinctly Inferior. Treatment of pile fabrics with colloidal silica is covered by TJ,, S. Patent No. 2,602,307, owned by the Mohav?k Carpet Company, of Amsterdam, New York. An agreement has been made with Mohawk under which Grasselli may designate licensees and collect royalties for Mohawk. It is believed that the soil resistance imparted by "Iiuclox,! is based on the deposition of the silica particles in the cracks and crannies of the individual filaments, which shuts out the entrance of soil particles, ''ludox'1 has a particle size of 17 millimicrons, whereas soil particles have not been found smaller than 20, more usually 80 to 90 millimicrons, "Ludox" provides resistance to air-borne soil only. Water will remove It, and no resistor has yet been developed for greaseborne or film type solids. Silicones are effective against waterborne solids but are incompatible with "udox" both In the wet stats and when deposited on a surface, Grasselli has proposed the use of "hudes" for Imparting soil resistance to a number of manufacturers and intends to continue doing so. Included are wallpaper and wallboard makers, plus & number of manufacturers of specialties, -particularly for household and Institutional use. In addition to'treatments involving applica tion of diluted "Ludox" itself, a shampoo for rug and upholstering fabrics was suggested, in which "Lu&oxr is present. The following type formula wan giveni ! j J I | S f N35505 DUP030003758 3 Bentonite "Ludox" Triton X-100 Water 15$ 60 12 _J_ 100$ Thiscomposition is a past, and dilution of one volume of paste with 8 volumes of water yields a product that cleans well and provides residual soil resistance simultaneously, Mr, Nylen said that the retail product sold for treating carpets under the name "Del-lay" by the Artloom Carpet Comoany, Philadelphia, is based on "Ludox'V This product lists at per quart. 2 - Scrub Resistance Mr. Koglund reported on laboratory experiments in which "Ludox" increased the scrub resistance of latex-based paints. They added it at the rate of 20 parts "Ludox" solids to 100 parts dry rubber solids, ftepholine had to be added to the "|jadox" beforehand. This was done to three brands of paints, including "Flow jcote" and. (Hidden11 s Sprecl-Satin, applied over bare wood panels The scrub resistance after 24 hours dry was remarkable in all throe brands. No data were available on applying such paints over gloss enamel or varnish, 3 - Miscellaneous "Ludox" Data ''Dados" costs 50-55 cents per pound of solids, currently, A variety haying half the particle size of the current grade has been prepared and samples are available for research, but it has not been eoBHaereiallzed (see Memo Report M-701)* The pH value of "Dudex" is being lowered from 9 to 7 around February 1. 4 - Water Resistance The discussion of the .sensitivity of !,Iudox" applications to water led to a proposal that "Voiron" Hydrophobic Silica might be of interest. Its particles are coarser, and it might prove ira* .possible to reduce them to the ".Ldox" size, but several possible ways of making a "Velron" dispersion were proposed. WAHj SH V7, W. A. Xi&LIt DUP030003759