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Патент USA US2108912

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2,108,912
I Patented Feb. 22, 1938
V
UNITED STATES PATENT OFFICE
2,108,912
DEFOAMING METHOD AND DIEANS
Harland H. Young, 'Jr., Chicago, Ill... assignor to
Industrial Patents Corporation, Chicago, 111., a
corporation of Delaware
N0 Drawing. Application July 9, 1935,
Serial No. 30,577
5 Claims.
(Cl. 252-6)
This invention :relates to the prevention of
foaming or frothing in the preparation or use
of solutions, suspensions or mixtures of various
kinds which have a tendency to produce foam
5
or froth.
_
One of the objects of this invention is to pro
vide an improved‘ defoamer which may be added
to such material as glue to prevent foaming when
the glue is used as it normally is used in aqueous
10 solutions.
Other objects of the invention will be appar
_ ent from the description and claims which follow.
It is lmown that water insoluble metallic soaps
are more or less e?ective as defoamers when the
15 metallic soap is dissolved in an organic solvent
such as para?in or tallow/and a dispersing agent
such as sulphonated oil- or sulphonalted tallow is
added. It is also known that some deioaming ef
feet is secured by the use of a water insoluble
29 metallic soap dissolved in an organic solvent
such as pine oil.
-
I
The present invention is directed to an un
red oil. This solution is then emulsi?ed with 30
to 50 pounds .of water in which form it is ready
for use.
~
‘
Although trivalent aluminum is known to form
only the mono- and di-stearate and not the tri- 5
stearate, I ?nd that by using a quantity of stearic
acid which approximates the quantity necessary
to convert a di-stearate to a tri-stearate,v the re
sulting defoamer is unusually effective and not
only has greatly increased defoaming power but 10
also inhibits separation of a scum of aluminum
stearate on the surface of glue to which the de
foamer has been added.
As used in this speci?cation and in the claims,
the term “solution" will be understood in its 15
broad sense as including true soluti0ns,'suspen
soids, and colloids.
I cl:
"
1. A defoamed product consisting of a mixture
of a foable substance capable of aqueous 20
solution, and a deioamer comprising aluminum
stearate, stearic acid and wax dispersed in the
\
usually e?ective deioamer which is inexpensive ioamable substance.
2. A defoamed product comprising a mixture
to prepare. The defoamer of the present inven
25 tion is prepared by ?rst dissolving aluminum of a foamable substance capable of aqueous soiu- 25
stearate in free steeric acid. The solution is sub= _ tion, and a defoamer comprising ? aluminum
sequently diluted with para
and the result= stearate and stearic acid.
3. A deioamer comprising wax, alum
ing was: is then emulsi?ed with the glue or other
mixture from which it is desired to remove the stearate and stearic acid. ,
4. The process of preparing a defng agent 30
30 foaming characteristic.
which comprises dissolving aluminum stearate in
An example of a suitable formula is as follows:
stearic acid and thereafter diluting the solution
Fifteen parts ofv aluminum stearate are dis
solved in 90 to 100 parts of stearic acid and to with paramn wax.
5. The process of preparing, a defoaming agent
this solution are added‘90 pounds of para?n wax
35 and 100 pounds of Japan wax. This wax isthen which comprises dissolving aluminum stearate in 35
made up into the defoamer as follows: 45 pounds stearic acid and. thereafter diluting the solution
of wax are dissolved in 135 pounds of tallow, so with wax.
pounds of castor oil, and, 30 pounds of whey"
': i ‘Qili
. YOUNG, Jn.
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