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Патент USA US2136868

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Patented Nov. 15, 1938
2,136,868
_ UNITED STATES PATENT OFFICE '
2,136,868
INSECTICIDE AND METHOD OF MAKING
SAME
Herbert Schotte and Karl carnal, Berlin, Ger
many, assignors to Schering-Kahlbanm A. (3.,
Berlin, Germany
No Drawing. Application December 12, 1933, Be
rial No. 702,026. In Germany June 30, 1932
7 Claims.
Our invention relates to insecticides, more espe
cially of vegetable origin, and has for its purpose
to provide means whereby such insecticides can
(Cl. 187-24)
Comparative tests with plant lice gave the
following results:
be rendered more e?icient.
As is well known to those skilled in the art,
difficulties are encountered in the direct conver
sion of insecticidal drugs into plant-protective
agents capable of being dusted and/or sprayed
onto the plants, since the vegetable constituents
10 of the drugs retain a considerable part of the
effective compounds in the drug, which are there
fore not utilized to their full extent. In order to
remedy this drawback one has frequently resorted
to extraction, which is however connected with
15' considerable extra costs.
_
We have now found that the effective constit
uents of roots, rhizomes, wood, green parts of
plants, leaves, blossoms and seeds can be freed
from the vegetable matter adhering to them and,
20 if desired, can be ?nely distributed in suitable
carrier substances by mixing them with molten
substances solidifying on cooling. In accordance
with the kind and constitution of the insecticides
they may be mixed with molten aliphatic ali
25
cyclic or cyclic hydrocarbons, terpenes, inorganic
salts, such as crystallized sodium acetate or
sodium sulfate, or mixtures of such substances.
Apart from the increase in ef?ciency thus ob
tained, the invention also oifers important physi
'
Test 1
Test 2
Mixture
of tobacco
90% sodium
acetate
and 10%
powder
' 1 tobacco powder: 10H,0
Dead _____________________ -_
22
Alive __________________ ____-_ 106
Dead ____________________ __ 143
Alive ____________________ ..
128
1
Thus Test 1 (pure tobacco powder) resulted in
17%, Test 2 (mixture of sodium acetate and
15
tobacco powder) in 100% killed plant lice.
Example‘ 2
Denis root is mixed with molten naphthol in
the proportion 01' 3:5 and the solid mixture is
ground with a suitable diluting agent, such as
tale. The product is highly e?icient against
caterpillars and possesses also fungicidal prop
erties.
'
Comparative tests each made with 50 cater
pillars liparis monacha (5th stage), 20 kgs. being
distributed on 2.5 acres, gave the following
results:
A. Mixture of 80% 0! an inert powder as 20%
den-is root
30 cal advantages, since the products thus obtained
30
possess particularly good adhesive properties and,
Alter 7 After 8
days
days
if suspended in water, can be easily sprayed with
out any change in composition, since the finely
distributed substances will remain ?oating in the
35
liquid.
‘
The insecticides such as obtained according to
the present invention may also be combined with
other insecticidal substances, such as arsenic com
pounds, or with fungicides, such as copper com
Test 1, killed ..................... _.
Test 2, killed ..................... ..
Test 3, killed _____________________ __
20
22
15
30
33
30
Feeding
condition
Strong
Strong
Strong
B. Mixture of 80% of an inert powder and 20% of
the derrie root-naphthol mixture
40 pounds, and with adhesives, such as lime-soaps,
or ?llers, such as talc, alumina, china clay, bole
and the like. When using them for spraying
purposes we have found it useful to add Turkey
45
red oil or other salts of sulfonic acids.
In practising our invention we may for instance
proceed as follows:
Example 1
50
Finely distributed tobacco powder is introduced
into an equal quantity by weight of molten sodium
acetate, until the temperature of the mixture has
risen to about 110° C. The solidi?ed mass is
powdered and can now be used for strewing or
55 spraying purposes.
10
144
40
Test 4, killed ....... --
Test 5, killed.-.
32
39
Week
-_
33
41
Not feeding
Test 6, killed.“v .................. _.
29
‘ 35
Weak
Example 3
45
25 parts rhizoma veratri were mixed with 60
parts molten crude naphthalene and after solidi
?cation the mixture was ground together with
alumina‘. The naphthalene may be replaced with
equal success by carbazol, thyme], isothymol or
crude anthracene.
'
Example 4
50 parts asagraea seed and 65 parts molten
naphthalene were mixed and diluted with suit 55
2
9,188,868
able ?llers according to the insect to be destroyed.
Comparative tests each with 8 caterpillars pan
olis ?ammaea (5th stage), 25 kgs. being dis
tributed per 2.5 acres, gave the following results:
Test 1
Test 2
killed 8 alter 4 days
cidal vegetable material and an organic carrier 15
85% naphthalene
and 15% asegraea
10
ExampIeS
8 after 2 days
'
Pyrethrum blossoms were mixed under short
20
vigorous grinding with 5/3, by weight, molten
naphthalene. The e?iciency of pyrethrum as in
secticide was thereby increased 25%.
25
Example 6
Equal parts pyrethrum blosoms and derris root
were mixed with molten naphthalene in the pro
portion of 3:5 and the mixture treated further
as described with reference to Example 3.
30
Example 7
Quassia wood was mixed with crystallized bo
rax which was melted and the molten mixture
powdered and strewed in the usual manner.
Various changes may be made in the details
35
2. As an insecticide, a ?nely divided mixture, so
lidi?ed from the molten state, of an insecticidal
vegetable material and an inorganic carrier sub
killed
0 ........................... ..
4
killed
1 ........................... .. +4
killed +5 ............................................... _.
killed +2 _______________________________________________ _.
Mixture containing
15
active insecticide from said insecticidal vegetable
material.
stance, the said carrier substance being solid at
ordinary temperatures, but melting below car—
bonization temperatures 01’ said vegetable mate
rial and in its molten state being capable of ex~
tracting the active insecticide from said insec
ticidal vegetable material.
3. As an insecticide, a ?nely divided mixture,
solidi?ed from the molten state, of an insecti
Inert powder containing 15% asagraes
1st day,
2nd day,
3rd day,
4th day,
its molten state being capable of extracting the
substance, the said carrier substance being solid
at ordinary temperatures, but melting below car
bonization temperatures of said vegetable mate
rial and in its molten state being capable of ex
tracting the active insecticide from said insec
ticidal vegetable material.
4. As an insecticide, a ?nely divided mixture,
solidi?ed from the molten state, of derris root
and a carrier substance, the said carrier sub
stance being solid at ordinary temperatures, but
melting below carbonization temperatures of der 26
ris root and in its molten state being capable of
extracting the active principle from said derris
root.
5. As an insecticide, a ?nely divided mixture,
solidi?ed from the molten state, of pyrethrum 30
blossoms and a carrier substance, the said car
rier substance being solid at ordinary tempera
tures, but melting below carbonization tempera
tures of pyrethrum blossoms and in its molten
disclosed in the foregoing speci?cation without
departing from the invention or sacri?cing the
state being capable of extracting the active prin 36
ciple from said pyrethrum blossoms.
advantages thereof.
6. The method of producing an insecticide of
increased potency, comprising mixing an insec
In the claims a?ixed to this speci?cation no
selection of any particular modi?cation of the
40 invention is intended to the exclusion of other
modi?cations thereof and the right to subse
quently make claim to any modi?cation not cov
ered by these claims is expressly reserved.
We claim:
1. As an insecticide, a ?nely divided mixture, so
lidi?ed from the molten state, of an insecticidal
vegetable material and a carrier substance, the
said carrier substance being solid at ordinary
temperatures, but melting below carbonization
50 temperatures of said vegetable material and in
ticidal vegetable material with a molten carrier
substance which is solid at ordinary tempera
tures, but melts below carbonization tempera
tures of said vegetable material and which is ca
pable of extracting the active principle from said
vegetable material, cooling and comminuting the
solidi?ed mixture.
46
'7. As an insecticide, ?nely distributed naph
thalene solidi?ed from the molten state and
asagraea seed in said solidi?ed naphthalene.
HERBERT scno'r'rn.
KARL GGRNITZ.
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