Патент USA US2136868код для вставки
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.