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Патент USA US2411443

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Patented Nov. 19, 1946
Lyle J. Lofdahl, Chicago, 111., assignor to Indus
trial Patents Corporati0n,.Chicago, 111., a cor
poration of Delaware
' No Drawing. Application May 1, 1944,
Serial No. 533,645
10 Claims.
(Cl. 260-3985)
The present invention relates to the improve
ment of soaps and, more speci?cally, it is con
cerned with the manufacture of soap composi
tions having improved resistance to discolora
Generally speaking, the agent may be employed
in the proportion of from about 0.003 per cent- to
tion and rancidi?cation.
The deterioration of color and odor in soaps
is generally attributable, either directly or indi
rectly, to autoxidation of unsaturated fatty acid
radicals contained in the products in various per
2 per cent based on the weight of the resulting
soap product. The upper limit will, in most
cases, be governed by economical considerations,
whereas the lower limit will depend upon the
proportion of unsaturated functions in the raw
material. It is preferred to employ from about
0.1 per cent to about 1 ‘per cent of the agent to
centages. The oxidative process is, furthermore, 10 provide a satisfactory stabilizing action for most
greatly accelerated in the ‘presence of certain
purposes. It is obvious, however, that very small
metals which apparently catalyze the oXidative
amounts of the agent are required in the case of
reaction. Since hydrogenating the unsaturated
soaps made from partially or fully hydrogenated
functions in the soap stock greatly increases the
fats and tallow. On the other hand, amounts in
cost and tends to reduce the desirable solubility 15 excess of about 1 per cent may be desired in the
of the product, this method of achieving sta
case of highly unsaturated soaps.
bility has not proven to be entirely satisfactory.
The agent may be prepared by ?rst stirring
The incorporation of certain types of tin com
powdered borax into an aqueous solution of stan
pounds, including sodium stannate, sodium stan
nic chloride until the mixture has been raised
nite, alpha stannic acid, and others, has been 20 to a pH value of from about 4 to 6.
proposed in the prior art as a means for inhibit
ing the chemical processes resulting in rancidi
?cation and discoloration of soap.
Although a
number of these derivatives inhibit rancidi?ca
The mixture is continuously stirred until it as
tion for satisfactory periods of time, preliminary 25 sumes a gel-like condition and, preferably, the
discoloration has been found to occur prior to
pH adjusted to about neutral. The gel product
odor rancidi?cation.
The main object of the invention is to improve
the resistance of manufactured soaps to discolor
Another object is to satisfactorily inhibit dis
coloration and rancidi?cation in soap products
while, at the same time, preserving‘ the fresh soap
contains about 30 per cent solids and is ready for
incorporation into'the soap.
The stannic borate gel formed by the above
30 procedure or stannic borate per se may be added
to the soap or soap product at any convenient
point in the manufacturing‘ operation. For ex
ample, it has been found advantageous to incor
odor for an inde?nite_period.
porate the agent into‘ the soap stock while in the
The invention contemplates stabilizing soap by 35 kettle or the crutcher, prior to‘ framing or before
the incorporation of stannic borate therein. It
the drying operation. In the case of a toilet soap,
has been discovered that when this compound is
it may be added before, after, or during the mill
incorporated into the soap during the process of
ing operation, with or without coloring matter,
manufacture, it is possible to accomplish a sub
perfumes, fillers and the like. The addition of
» stantial improvement in the prediscoloration pe 40 the agent is preferably accomplished as soon as
riod of the resulting soap composition. Further
possible after saponi?cation so as to curtail the
more, a substantial extension of the prerancid
formation of intermediate peroxides. As a gen
i?cation period over that possible in the use of
eral rule, the sooner the antioxidant can be added
other tin compounds as inhibitors is obtained.
to the soap stock, the more effective the stabiliz
Preferably the invention is carried out by incor 45 ing action.
porating the reaction product of an aqueous
In order to obtain a comparison between the
solution of stannic chloride and borax, having a
effect of stannic ‘borate with known inhibitors on
substantially neutral pH, into the soap» stock
lengthening the prediscoloration period of soap
during the process of manufacture. The ad
products, a number of samples were prepared
vantage of adding the agent in this form is that 50 from the same lot of soap containing the same
substantially improved dispersion results due to
amount‘ of stabilizer (0.05 per cent) and the
the colloidal condition of the reaction product.
samples subjected to aging treatments to deter
The amount of the agent to be added is de
mine the relative deterioration that had occurred
pendent on the degree of unsaturation of the raw
during the respective periods. At the termina
materials, e. g. fat, in a particular instance. 55 tion of the test period, color readings were taken
on the aged samples, using a Zeiss Pulfrich
alpha stannic acid, stannous chloride and other
Photometer which measures the whiteness of the
acid-forming salts which have at least a mild
sample in comparison with a pure white block
corrosive action on metallic surfaces.
of baryta white. A reading of 100 on this instru
It is obvious that the proportions of the agent
ment indicated a material which is pure white. U! employed may be varied over wide limits without
In the following table, the control indicates
departing from the spirit of the invention. More
samples. which did not contain any- stabilizer,
over, the speci?c manner described herein for in
while the color of the fresh samples prior to sub
corporating the agent into the soap stock is purely
jection to the aging tests are indicated in the last
for the purpose of illustration and is not intended
as limiting the invention.
I claim:
1. The method of stabilizing soap, which com
Sodium Sodium
sggggéc stannic stanacid
Color of
I. Six months
at room con
ditions _____ ._
56. 2
49. 5
_______________ __
43. 7
70. 0
43. 6
3. The method of improving the color stability
79. 8
20 of soap, which comprises incorporating therein
II. Six months
porating therein a small amount of stannic borate.
at room con
ditions _____ __
______ -_
73. S
______ __
55. 1
111. Two weeks
at 45° C ____ s.
prises incorporating therein stannic borate in
suf?cient amount to substantially retard de
15 terioration and color formation.
2. The method of improving the color stability
of a soap composition, which comprises incor
______________ _-
during the process of manufacture the reaction
product of an aqueous solution of stannic chloride
In Experiment I, the effect of stannic borate is
. and borax, having a substantially neutral pH,
compared with that of alpha stannic acid in a
said product comprising as an essential ingredient
milled soap by aging both samples for 6 months
at room conditions. As shown in the table, the 25 stannic borate.
4. The method of stabilizing soap, comprising
sample containing stannic borate showed a ma
incorporating therein from about 0.003 per cent
terial improvement in color over the sample con
to about 2 per cent of stannic borate.
taining alpha stannic acid. Experiment II sim
5. The method of stabilizing soap, comprising
ilarly demonstrates the superiority of stannic
boram over sodium stannate and sodium stannite 30 incorporating therein between about 0.1 per cent
and about 1 per cent of stannic borate.
in samples taken from another soap lot. In
6. A color stable soap product, comprising a
Experiment III, the eifect of stannic borate on
body of soap and stannic borate uniformly dis
the prediscoloration period of framed soap is
persed through said body in su?icient amount to
compared with sodium stannate. In this case, the
stabilize substantially the soap against deteriora
samples Were given an accelerated aging test by
tion and color formation.
maintaining them at 45° C. for 2 weeks. It was
'7. A stable soap product, comprising soap and
observed that the sample containing stannic bor
a small amount of stannic borate stabilizer in
ate showed a very marked improvement in color
corporated therein.
and odor over the sample containing sodium
8. A stable soap product comprising soap and
stannate. In Examples 1 and 2, the agents were 40
added during amalgamation and prior to milling,
between about 0.003 per cent to about 2 per cent
while in Example 3, the agents were added during
of stannic borate incorporated therein to stabilize
the crutching stage of processing.
the color.
A soap stock consisting of 83 per cent tallow
9. A stable soap product comprising soap and
soap and 17 per cent coconut soap has been 45 between about 0.1 per cent to about 1 per cent of
stabilized with 0.2 per cent of a reaction product
stannic borate incorporated therein to retard de
of an aqueous solution of stannic chloride and
terioration and color formation.
borax, while being processed in the crutcher.
10. A stable soap product comprising soap and
The stabilized soap product maintained substan
a small amount of the reaction product of an
tially the original color for an inde?nite period
aqueous solution of stannic chloride and borax
of time.
incorporated therein to retard deterioration and
An outstanding advantage is that stannic borate
color formation, said product comprising essen
is a neutral product and, therefore, entirely free
tially stannic borate.
from any corrosive action on soap making equip
ment. In this respect, the agent is superior to
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