Patented formulation technology small, high technology vehicles for active ingredients water-based formulations.

Strongly adhesive microcapsules for difficult surfaces improved operator safety.

Liquid concentrate eliminates dust customized release characteristics.

Microcapsules are manufactured by an emulsification process of oil in water, followed by wall formation of a crosslinked polymer at the interphase water and oil.

The droplet size achieved by the emulsification step determines the inner diameter of the resulting microcapsule.

The amount of wall forming material deposited and crosslinked at the surface of the droplet determines the outer diameter of the resulting microcapsule.

The droplet of active ingredient is inside the cross linked capsule wall captured like inside an eggshell. The release takes place by diffusion through the pores of the capsule wall or by wall disruption.

When the wall of the microcapsules is disrupted, the active ingredient is released immediately whereas the release by diffusion is controlled by the porosity of the capsule wall and its thickness.

The porosity of the capsule wall is controlled by the degree of cross linking achieved by different types and ratios of pre-polymers.

The wall thickness is controlled by the amount of wall forming material.

 

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Kinetics of SLOW, MEDIUM and FAST releasing microcapsules.

By changing the particle size and the wall properties, GAT has tailored the release rate of the active ingredient. Mixtures of fast release microcapsules and slow release microcapsules (up to several weeks) give knock-down action and long residual activity.

 

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Schematic release process of CS formulations applied to surface. After spraying the diluted product, the water evaporates and the capsules start releasing the active  ingredient followed by disruption of the capsule wall and full release.

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typical microcapselsuspension  in water  400 x enlarged

fast release capsules with thin walls looking like dented balls

slow release capsules with thick capsule walls looking like spheres - manly for biocidal applications

many microcapsules covering the surface

release mechanism of microcapsules by disruption and diffusion through pores

Protection of the active ingerdient Microencapsulation extends the stability of the active ingredient
Residual control Rapid knock-down effect due to fast release from the small microcapsules and longer residual to the slow release from the big microcapsules
Enhanced performance no porous and highly absorbent surfaces The polymer wall protects the active ingredient and makes the active ingredient available to the insect through diffusion through the capsule wall and disruption of the capsules
Lower mammalian toxicity As the active ingredient is entrapped into the microcapsules the exposure to mammals is reduced
Low or no content of organic solvent A minimum amount of organic solvent is inside the microcapsules, dissolving the active ingerdient;
Alslo vegetable oils can be used as a solvent