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Патент USA US2128113

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252. COMPOSITIONS,
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2,128,113
Patented, Aug. 23, 1938
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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.
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