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AssigneeBYK-Chemie GmbH
InventorsKarl-Heinz Haubennestel, Holger Heilmann, Andreas Diez
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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.
A thixotropic formulation comprising a liquid base, an effective thixotropy imparting amount of highly disperse silica, and an effective silica activity enhancing amount of a hydroxyfunctional polycarboxylic acid amide of formula I Ser. No. 162,901 ##STR14## wherein the symbols have the following meanings:
A highly disperse silica which is coated with a hydroxyfunctional carboxylic acid amide of formula I:
A method of rendering a liquid formulation thixotropic comprising the step of incorporating into said formulation an effective thixotropy imparting amount of highly disperse silica and an effective silica activity enhancing amount of a hydroxyfunctional polycarboxylic acid amide of formula I ##STR20## wherein the symbols have the following meanings:
Dependencies are inferred from the claim text.