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US 5,516,529 AGranted
Granulates useful for preparing effervescent pesticide tablets
OwnerJean-Michel Zellwegerinventor
Life of this patent
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Abstract
An effervescent granulate consisting of a solid water-soluble acidic substance, potassium carbonate and/or potassium hydrogen carbonate and one or more water-insoluble substances that are capable of absorbing water, a pesticidal active ingredient concentrate that is in the form of effervescent tablets and contains the effervescent granulate, and the preparation of the effervescent granulate and of the pesticidal active ingredient concentrate are described.
Claims14
An effervescent granulate having a mesh size of from 0.5 to 1 mm. which consists essentially of:
- a) water-soluble polybasic acid or an acid salt thereof;
- b) a carbonate selected from the group consisting of potassium carbonate and potassium hydrogen carbonate;
- c) a finely divided water-insoluble substance that binds water, selected from the group consisting of (1) a highly dispersed precipitated or pyrogenic silicic acid, (2) an amorphous aluminosilicate containing from 5 to 30% by weight of Al.sub.2 O.sub.3 and from 70 to 95% by weight of SiO.sub.2 and having an inner surface area, measured according to BET, of from 50 to 800 m.sup.2 /g, a pore volume of from 0.2 to 3 cm.sup.3 /g and a particle size of from 8 to 25 .mu.m, (3) a natural or synthetic zeolite having a particle size of from 8 to 25 .mu.m, and (4) aluminum oxide;
- and
- wherein the effervescent granulate has from 80 to 95% by weight of a) and b) combined and from 5 to 20% by weight of c), and the equivalent ratio of a) to b) is from 0.5 to 1.5.
2 more elements
Dependencies are inferred from the claim text.