Method for producing highly impact-resistant granules
The present invention provides highly impact-resistant, water-soluble or water dispersible, low-dust granules comprising an active ingredient and methods for obtaining the same.
1. A method for producing a highly impact-resistant granule comprising:
(a) obtaining a coating composition comprising a water-soluble or water dispersible polymeric material;
(b) obtaining a core material comprising a particle and active ingredient, wherein the active ingredient is either incorporated into the core material or in a layer surrounding the core material; and,
(c) casting the coating composition in a liquid or molten form onto the core material to form a flexible film coating the core material to produce a granule, wherein the casting is selected from the group consisting of spinning disc casting and emulsion gelation casting, wherein the flexible film comprises less than about 20% by weight of the granule and the granule has a RIT dust value of less than about 100,000 ng/g, determined by using 216,000 collisions at 8.7 m/s and an amplitude of 1.5 cm, and wherein the flexible film has an elongation upon break of at least 30%, at least about 50%, at least 100%, at least about 125%, at least about 150% or at least about 200%, determined by dividing gage length measured after breakage of the film due to applying tensile strain by original gage length of the film of 10-100 mm.
2. The method according to claim 1 wherein the casting comprises spinning disc casting.
3. The method according to claim 1 wherein the casting comprises emulsion gelation casting.
4. A highly impact-resistant granule produced according to the method of claim 1 .
5. A highly impact-resistant granule produced according to the method of claim 2 .
6. A highly impact-resistant granule produced according to the method of claim 3 .