US 12,330,128 B2
Process for preparing an aqueous dispersion of microparticles
Marion Winkelmann, Ludwigshafen (DE); Kerstin Muelheims, Ludwigshafen (DE); Ralph Tauber, Gerolsheim (DE); Yannick Fuchs, Speyer (DE); Murat Cetinkaya, XZ Den Haag (NL); and Bernd Sachweh, Meckenheim (DE)
Assigned to BASF SE, Ludwigshafen am Rhein (DE)
Appl. No. 15/769,158
Filed by BASF SE, Ludwigshafen am Rhein (DE)
PCT Filed Oct. 20, 2016, PCT No. PCT/EP2016/075187
§ 371(c)(1), (2) Date Apr. 18, 2018,
PCT Pub. No. WO2017/068024, PCT Pub. Date Apr. 27, 2017.
Claims priority of application No. 15191091 (EP), filed on Oct. 22, 2015.
Prior Publication US 2018/0297001 A1, Oct. 18, 2018
Prior Publication US 2020/0139331 A9, May 7, 2020
Int. Cl. B01J 13/02 (2006.01); A01N 25/04 (2006.01); A01N 25/28 (2006.01); A61K 9/14 (2006.01); A61K 9/50 (2006.01); B01J 13/18 (2006.01); C09B 67/02 (2006.01); A01N 43/54 (2006.01)
CPC B01J 13/18 (2013.01) [A01N 25/04 (2013.01); A01N 25/28 (2013.01); A61K 9/145 (2013.01); A61K 9/5089 (2013.01); C09B 67/0097 (2013.01); A01N 43/54 (2013.01); A01N 2300/00 (2013.01)] 15 Claims
 
1. A process for preparing an aqueous dispersion of microcapsules containing a water-insoluble solid organic material selected from agriculturally active compounds and an aminoplast resin that surrounds or embeds the water-insoluble solid organic material, the process comprising the following steps:
i. providing an aqueous slurry of a water-insoluble solid organic material in a form of coarse particles;
ii. subjecting the aqueous slurry to shear forces in order to comminute the coarse particles, wherein an aqueous suspension of fine particles of the water-insoluble solid organic material is obtained; and
iii. performing a polycondensation of an aminoplast pre-condensate in the aqueous suspension obtained in step ii;
wherein the subjecting the aqueous slurry to shear forces of step ii is performed in the presence of at least one protective colloid and at least a portion of the aminoplast pre-condensate subjected to the polycondensation of step iii;
wherein the protective colloid is selected from the group consisting of a homo-or copolymer of a (meth) acrylate monomer having a sulfonic acid group, a (meth) acrylamide monomer having a sulfonic acid group, arylsulfonic acid formaldehyde condensates, and mixtures thereof.