Basf Se Corporation

Basf Colors & Effects Gmbh

Marion Winkelmann

Bernd Sachweh

Yannick Fuchs

Steffen Onclin

Wolfgang Gerlinger

Murat Cetinkaya

Heike P Schuchmann

Aaron Wagner

Paul Brown

Christof Kujat

Lena Hecht

Ralph Tauber

Kerstin Muelheims

Provided herein is a process for preparing an aqueous dispersion of microparticles containing a water-insoluble, solid, non-polymeric, organic active or functional material (M) and an aminoplast resin (A) which surrounds or embeds material (M). The process includes the following steps: i) providing an aqueous slurry of the material (M) in the form of coarse particles; ii) subjecting the aqueous slurry to shear forces such that the coarse particles of the material (M) are comminuted and an aqueous suspension of fine particles of the material (M) is obtained; and iii) performing a polycondensation of an aminoplast pre-condensate during step (ii) or in the aqueous suspension of the fine particles of the material (M) obtained in step (ii); wherein step (ii) is performed in the presence of at least one protective colloid and in the presence of at least a portion of the aminoplast pre-condensate subjected to the polycondensation of step (iii).

Process for preparing an aqueous dispersion of microparticles

A process for preparing an aqueous dispersion of pigment particles is described. The pigment particle contains a pigment and an aminoplast resin which surrounds or embeds the pigment. The process includes (i) a step of subjecting an aqueous suspension of a pigment in the form of coarse particles to milling so that the coarse particles are comminuted in the presence of a polymeric dispersant to a particle diameter d(v 0.9) of below 1500 nm, as determined by laser diffraction; and (ii) a step of polycondensation of an aminoplast pre-condensate in the aqueous suspension of the comminuted particles of the pigment obtained in step (i) or during the milling of step (i). The polycondensation is performed in the presence of an acid catalyst at pH of below 5.5. The aqueous dispersion obtained by the process and the use of the aqueous dispersion for tinting waterborne liquid coating composition are also described.

Process for preparing an aqueous dispersion of pigment containing particles

The invention provides a continuous process for producing polymer-shell nanoparticles, especially in the form of aqueous dispersions, using a high-pressure homogenizer.

Process for producing polymer-shell nanoparticles

Growing community of inventors

Ludwigshafen, Germany

Marion Winkelmann