Byk-Chemie Gmbh

Andreas Diez

Karl-Heinz Haubennestel

Holger Heilmann

Hydroxyfunctional carboxamide compounds of formula I ##STR1## are included in thixotropic formulations containing highly disperse silica as a thickening or thixotroping component in order to activate the silica or enhance its effect, to amerliorate any tendency of the silica to settle and/or to prevent weakening of the thixotroping effect of SiO.sub.2 in formulations which themselves form relatively strong hydrogen bonds. The compounds of formula I may be added to silica-containing thixotropic liquid formulations to improve the thixotropy, or highly disperse silica may be coated with such compounds for later incorporation into liquid systems to render them thixotropic.

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Wesel, Germany

Andreas Diez