Endosulfan microcapsule dispersion
AssigneeAventis CropScience GmbH
InventorsHans-Peter Krause, Thomas Maier, Jan Nicolaas Bremmer
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Abstract
Aqueous endosulfan microcapsule dispersions in which the dispersed microcapsules comprise endosulfan, an organic solvent or solvent mixture and a capsule-forming material based on isocyanate prepolymers and the aqueous phase which represents the dispersion medium comprises surfactants, a water-soluble inorganic salt with or without other formulation aids, which include a relatively small amount of capsule-forming material, and a process for their preparation.
Claims9
An aqueous endosulfan microcapsule dispersion in which the dispersed microcapsules comprise endosulfan, an organic solvent or solvent mixture and a capsule-forming material based on isocyanate prepolymers and the aqueous phase, which represents the dispersion medium, comprises surfactants with or without other formulation aids, and which microcapsule dispersion, based on the total dispersion, comprises:
- 20-40% by weight of endosulfan;
- 10-35% by weight of organic solvent or solvent mixture;
- a capsule-forming material obtainable by curing 0.5-5% by weight of isocyanate prepolymers;
- 0.2-5% by weight of one or more surfactants selected from the group consisting of emulsifiers and dispersants and
- an amount of calcium chloride, wherein said amount is sufficient to produce a density of the aqueous phase of between 1.05 and 1.45 kg/l.
An aqueous endosulfan microcapsule dispersion in which the dispersed microcapsules comprise endosulfan, an organic solvent or solvent mixture and a capsule-forming material based on isocyanate prepolymers and the aqueous phase, which represents the dispersion medium, comprises surfactants with or without other formulation aids, and which microcapsule dispersion, based on the total dispersion, comprises:
- 20-35% by weight of endosulfan;
- 15-30% by weight of organic solvent or solvent mixture;
- capsule-forming material obtainable by curing 1-2% by weight of isocyanate prepolymers;
- 0.5-2% by weight of one or more surfactants selected from the group consisting of emulsifiers and dispersants;
- and
- an amount of calcium chloride, wherein said amount is sufficient to produce a density of the aqueous phase of between 1.05 and 1.45 kg/l.
A process for preparing an aqueous endosulfin microcapsule dispersion in which the dispersed microcapsules comprise endosulfan, an organic solvent or solvent mixture and a capsule-forming material based on isocyanate prepolymers and the aqueous phase, which represents the dispersion medium, comprises surfactants with or without other formulation aids, and which microcapsule dispersion comprises, based on the total dispersion,
- 20-40% by weight of endosulfan;
- 10-35% by weight of organic solvent or solvent mixture;
- a capsule-forming material obtainable by curing 0.5-5% by weight of isocyanate prepolymers;
- 0.2-5% by weight of one or more surfactants selected from the group consisting of emulsifiers and dispersants;
- and
- an amount of calcium chloride, wherein said amount is sufficient to produce a density of the aqueous phase of between 1.05 and 1.45 kg/l,
- mwhich comprises preparing a coarse preemulsion of an organic and aqueous phase, then subjecting this to shear forces and, with or without addition of a diamine, curing the fine emulsion thus obtained in the entire volume of substance.
Dependencies are inferred from the claim text.