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Патент USA US2408391

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‘Patented
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92.408389
PATENT; , oFFicE
' 2.408.389!
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REPELLENT~Q
Samuel I. ,Gertler, Washington, D. 0., assignor to
of America,
' United States
> Secretary of Agriculture
i .No Drawing;
as represented by ,
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Application September 1 4, , 1944,
Serial ‘No. 552,665
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l ‘ 4 Claims‘. ‘(01.167430)’
(Granted under the act or 'March 3,1383.“ , a‘
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amended April 30, 1928; ,370 0. G. 757)
This application is mad'eiunder» the fact" vof I ’ Y wide‘ range. Other materials maybe
March 3, 1883, as amended bythe act of ‘April
30, '1928,'and the invention herein ‘described, if
_
added to ' '
these‘v carriers to give them consistency ,or form, ,
if; so desired.
. patented, may be manufactured and used by or
,The following are examples of the form and ‘
for .the Government of [the United States of
‘method of use of my invention’:
America for governmental purposes without the
payment to me of any ‘royalty thereon.
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Example .]
This invention relates to a' repellent of such
IAv ,lfrepellent composition, "in the‘ form v,oi a
I insects asmosquitoes, Tflies, gnats,; ?eas, and the:
cream,"- comprising N,'N-.diethylbenzamide' and a
like, and has for its objects the preparation vof a 10 .mixturebof' lanolin, :petrolatllm. and para?in.
repellent which is effective long after, application,‘v
Such a cream may be"applied directly to the
g is-not easily removed inadverse weathenis. not
Skin; 1' ‘
‘ harmful to humans or animals, is not deleterious
_ to'textiles, and is not obnoxious in use.
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A repellent‘ compositionyin- the form of a ~
i with a mineral or vegetable'oil, such as corn 011,
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> Most of the repellents used in the prior'art are
volatile and soon evaporate.
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“cotton seed voil, peanut oil,_and*the'like. Such
a lotion mayalso berubbed directlyon the skin.
widely‘distributed, and a common carrier- of~yel-'v
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15 lotion, comprising N,N-diethylbenzamide together ‘
fective as repellents, as for example, against the ~
Aedes aegypti, which is a species of mosquito very .
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Example II
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prising N_.N-diethylbenzamide are-particularly ef-.;,
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'_ I have found that certain compositions com
low lever.
The pure compound, _ v _
N,N-diethylbenzamide, however, ‘is .a'relatively
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_[E.ram'ple m,
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‘- Another repellent composition in the form of a
lotion, comprising a solution of N,N-diethylbenza
non-volatile liquid havingi'a boiling‘point of 280° . ' midey‘in-cethyi alcohol, glycerol, or‘ any suitable
solvent which is harmless to the skin.
C..~at ordinary pressures. It has little odor, and
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Example IV
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when rubbedion the skin, produces .no'lnoticeable'
‘irritating effect.
, stain fabrics.
It .is- colorless anddoes not 1 I
Anotherrepellent composition in the form of a t
Consequently, all theselproperties,
‘ lotion, ‘comprising an emulsion of ~N.N-diethy1
" make it ideal for the purpose intended.
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benzamide emulsi?ed- in Water‘ by-the employ
Compositions vcomprising-this substance were .30 ment
of‘ an emulsifying agent, such as trieth-pv
used in a number of tests and it was found that ' ‘ anolamine, and such other ingredients as
may‘
protection was obtained for a'minimum‘ of ‘5.5 '
‘be necessary toiobtain a suitable product.
» , tain
hoursconditions,
and up to even
7.5 hours,‘
longerand
periods
that,"ofunder
repellent
cer-‘ ‘ ‘
' H action
were
obtained,
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‘ExampZéfV
' A repellent composition, in the form or a dust
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Various typesof compositions can'be used to .
'ing powder,_ comprising adsorbed ,N,N-dlethyl
‘obtain good repellenteffects, such compositions ,' benzamide and a dusting powder, such as talc.
in the.main, comprising N,N-diethylbenzarnide , '
i. It. should be understood that theabovetype
as its essential active ingredient, and a carrier,
compositions'needy not be applied only .to’the'
said carrier being a.material‘ormaterials into (0 skin. ‘The iN,N_-diethylbe_nzamide may also be
which the N,N-diethylbenzamide is incorporated
dissolved in alcohol or, any volatile solvent and
-to produce a composition in a form which; may
' vused to impregnate clothing.‘
then be readily applied to the region from which "
the insects are to be repelled. Applicable carriers.
include dusting powders" such as talc,v and suit
able non-toxic solvents such ‘as ethyl alcohol, ~
‘ Having thus described my ‘inventionfllclaim:
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selected from the group consistingof a dusting
powderanda suitable non-toxic solvent.
2. An insect repellent composition comprising
like triethanolamine, a mineral oil such as pctro~
latum, a vegetableoil such as corn oil, ‘cottonseed. '
oil, and peanut oil, and ananimal fat such as
lanolin. Mixtures of these carriers may- also" i)
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1. An insect repellent composition comprising
45 N,N~diethylbenzamide,incorporated in a carrier
glycerol, a mixture ofiwater and an'em‘uisi?er
be employed.
, N ,N-'diethylbenzamidev incorporated in av dusting
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powder.
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T3. Anfinsect repellent composition comprising
For example, a mixture oi-lanol'in, . ,
. N ,N -diethylbenzamide ‘incorporated in a suitable ’
' petrolatum, and paraihn may be usedwhere it is
non-toxic solvent.
desired that the composition‘ be in the form of a j‘ ' = '4. A. process of repelling insects comprising
cream. The carrier ‘used depends on the co'ndié 55 applying to. the region from which thejflnsects
tions or purpose for which the repellent action '
is desired, and therefore, the repellent compo- ‘
sition may be in- the form of a cream, lotion,‘
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. are to be repelled a composition, containing N,N
dust, and so forth, the proportions oivthe int-p,
gredients being capable or being varied overfa 5'0
diethylbenzamide as its essential] active in»
gredient.
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SAMUEL I. GERTIER.
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