Claims
- 1. A solid particulate composition comprising particles of an inert sorptive or non-sorptive carrier impregnated or coated with a pesticidally effective amount of a phosphorus pesticide which is 2-(diethoxyphosphinylimino)-1,3-dithiolane, 2-(diethoxyphosphinylimino)-4-methyl-1,3-dithiolane or 2-(diethoxyphosphinylimino)-1,3-diethietane and wherein the impregnated or coated carrier is coated with a finely divided sorptive substrate and an acrylic polymer selected from the group consisting of a (1) hard, thermoplastic acrylic polymer having an intrinsic viscosity of from 0.75 dl/g to 3.1 dl/g at 30.degree. C. in tetrahydrofuran, (2) hard, self-crosslinking thermoplastic acrylic polymers having an intrinsic viscosity of from 1.0 dl/g to 2.0 dl/g at 30.degree. C. in dimethylformamide and (3) acrylic polymers having an intrinsic viscosity of from 0.05 dl/g to 0.1 dl/g at 30.degree. C. in butanol, wherein the thus-obtained composition is characterized by decreased mammalian dermal toxicity and sustained pesticidal activity.
- 2. The composition according to claim 1, wherein the carrier is attapulgite, montomorillonite clays, brick chips, pumice, talc, volcanic cinders, corncob grits, sand and limestone chips in amounts ranging from 62% to 94% by weight of the overall composition; and when a sorptive carrier is selected, a deactivator selected from the group consisting of ethylene glycol, di-, tri-, tetraethylene glycol and mixtures thereof is incorporated in the composition in amounts ranging from 3% to 6%, by weight, of total composition to neutralize the intrinsic acidity of the carrier, provided that the percent by weight amount is lowered with an amount equal to that of the deactivator employed; the pesticide being in amounts ranging from 2% to 25%, by weight of the composition; and wherein a sorptive substrate is a calcined clay, diatomaceous earth, calcium silicate, fumed silica or fumed silica which has been made hydrophobic by replacement of most of the hydrophilic hydroxyl groups which populate the surface of the silica with trimethylsiloxyl groups in amounts ranging from 0.5% to 2%, by weight, of the total composition; the acrylic polymer being a hard, thermoplastic acrylic polymer having an intrinsic viscosity range of from 0.75 dl/g to 3.1 dl/g at 30.degree. C. in tetrahydrofuran, hard, self-crosslinking thermoplastic acrylic polymers having an intrinsic viscosity ranging from 1.0 dl/g to 2.0 dl/g at 30.degree. C. in dimethylformamide or acrylic polymers having an intrinsic viscosity ranging from 0.05 dl/g to 0.1 dl/g at 30.degree. C. in butanol in amounts ranging from 0.5% to 5%, by weight, of the total composition.
- 3. A method for controlling the rate of toxicant release of 2(diethoxyphosphinylimino)-1,3-dithiolane, 2-(diethoxyphosphinylimino)-4-methyl-1,3-dithiolane or 2-(diethoxyphosphinylimino)-1,3-dithiethane containing a particulate composition comprising applying to the composition in amounts ranging from 0.5% to 5% by weight of the particulate total composition an acrylic polymer of (1) hard thermoplastic acrylic polymers having an intrinsic viscosity of from 0.75 dl/g to 3.1 dl/g at 30.degree. C. in tetrahydrofuran, (2) hard self-crosslinking thermoplastic acrylic polymers having an intrinsic viscosity of from 1.0 dl/g to 2.0 dl/g at 30.degree. C. in dimethylformamide, or (3) acrylic polymers having an intrinsic viscosity of from 0.05 dl/g to 0.1 dl/g at 30.degree. C. in butanol; and thereafter coating the acrylic polymer coated compositions with a finely divided sorptive substrate wherein the solid particulate composition comprises particles of an inert, course or finely divided sorptive or non-sorptive carrier impregnated or coated with the toxicant.
- 4. A method for controlling the rate of toxicant release of 2-(diethoxyphosphinylimino)-1,3-dithiolane, 2-(diethoxyphosphinylimino)-4-methyl-1,3-di-thiolane or 2-(diethoxyphosphinylimino)-1,3-dithietane containing a particulate composition comprising coating the composition with a finely divided sorptive substrate and thereafter applying to the particulate coated composition in amounts ranging from 0.5% to 5% by weight of the total composition an acrylic polymer of (1) hard thermoplastic acrylic polymers having an intrinsic viscosity of from 0.75 dl/g to 3.1 dl/g at 30.degree. C. in tetrahydrofuran, (2) hard self-crosslinking thermoplastic acrylic polymers having an intrinsic viscosity of from 1.0 dl/g to 2.0 dl/g at 30.degree. C. in dimethylformamide, or (3) acrylic polymers having an intrinsic viscosity of from 0.05 dl/g to 0.1 dl/g at 30.degree. C. in butanol; wherein the particulate composition comprises particles of an inert, course or finely divided sorptive or non-sorptive carrier impregnated or coated with a toxicant.
Parent Case Info
This is a division of application Ser. No. 174,951 8/4/80 which is now U.S. Pat. No. 4,343,790 which is a continuation of Ser. No. 9883 2/6/79 now abandoned.
US Referenced Citations (7)
Non-Patent Literature Citations (1)
Entry |
Chem. Abst. 86, 63487(k), (1977)--Chen. |
Divisions (1)
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Number |
Date |
Country |
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174951 |
Aug 1980 |
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Continuations (1)
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Number |
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9883 |
Feb 1979 |
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