Патент USA US2128113код для вставки
Examine 252. COMPOSITIONS, g7 u, he i l 2,128,113 Patented, Aug. 23, 1938 a ii i i i l l UNITED STATES PATENT OFFICE 2,128,113 STABLE OXYGEN-YIELDING WASHING‘ POWDER ‘ Karl Bauer, Frankfort-on-the-Main, and Fried rich Pressel and Hans Medweth, Rheinfelden/ Baden, Germany, assignors to Deutsche Gold und Silber Scheideanstalt vormals Roessler. Frankfort-on-the-Main, Germany, a. corpora tion of Germany No Drawing. Application May 25, 1935, Serial No. 23,518. In Germany June 9, 1934 (01. 87-5) The object of this invention is a process for or less, preferably 5-7%, have such good stability that they are in no way inferior to the detergents the preparation of stable oxygen-yielding wash ing powders, utilizing percarbonate salts such as prepared with alkali metal perborates and re 2 Claims. the alkali metal percarbonates. It has been found that stable compositions are obtained when the moisture content is restricted in accordance with the following disclosure. Washing powders are ordinarily powdery mix tures which contain besides soap powders also additional materials such as soda, water glass and the like. Up to this time perborates, especially sodium perborate, have been used extensively in the preparation of oxygen-yielding washing powders main practically unchanged after several months storage. If desired, the water can be extracted to such an extent that practically dry substances are obtained. The novel stable oxygen-yielding washing powders containing percarbonate with which our invention is concerned may be prepared by 10 adding an alkeiimetel-nereerbonaie1 such as sodium percarbonate, to a detergent‘ mixture comprising ‘soap and sodiummgarb‘onate. If de sired, the detergent r'n?ixtu‘i‘e'may contain, in ad dition to the soap and soda, other substances 15 with soap and the other usual ingredients of which are usually present in washing powders washing powders, such as soda, water glass and such as water glass (sodium silicate). After the addition of the sodium percarbonate to the de the like, were the most stable. Perborates when mixed with soap powders, soda, water glass and tergent mixture, the resulting mixture is ‘dehyg drated so that its moisture content falls within 20 20 the like, lose only a small per cent of their orig inal active oxygen content after storage for one wtl'ie'i‘ange 5 to 10%. This range represents the per cent moisture content by weight and is based year. The preparation of stable detergents utilizing upon the weight of the ingredients comprising 15 or detergents, because these salts when mixed the percarbonates has been attempted in various 26 ways. The experiments, however, have not been entirely successful, since mixtures of the same composition as the perborate detergent mixtures are always much less stable and lose a great deal or all of their active oxygen within a compara tively short time. An effort has been‘ made to stabilize the percarbonates by means of anti catalysts or by covering them with hydrophobic substances. ‘However, these experiments have 35 not given successful results. Recently it has been found that stable mixtures of percarbonates such as sodium percarbonate with soaps and the other usual ingredients of washing powders can be produced in the ab sence of water. If, for example, the percar bonate is mixed with the other anhydrous in gredients oi‘ the washing powder, mixtures are obtained which have excellent stability. As a result of many experiments it has been ascertained that mixtures with a moisture con 45 tent of about 25% are much more stable, and that mixtures with a moisture content 01' 10% the complete oxygen-yielding washing powder. To the percarbonate can be added stabilizers 25 such as magnesium silicate, and the like. According to the invention, in place of soap or in combination with it, soap substitutes, such ' as fatty alcohol sulfonates and the like, may be used. We claim: 1. A stable alkaline oxygen-yielding washing powder which comprises an alkali metal percar bonate, sodium carbonate, and soap, the moisture content of said washing powder falling within the 35 limits 5 to 7% by weight, based on the weight of said washing powder. 2. A stable alkaline oxygen-yielding washing powder which comprises an alkali metal percar bonate, sodium carbonate, soap, and water glass, 40 the moisture content of said washing powder falling within the limits 5 to 7% by weight, based on the weight of said washing powder. KARL BAUER. FRIEDRICH PRESSEL. HANS MEDWETH.