Importance

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Abstract

Permanently non-dusting pigment and dye preparations, which contain as dedusting agents, (a) a surface-active substance in an amount of from 0.5 to 10%, and (b) a substance which after mixing of the dried mixture of pigment and surface-active substance causes the mixture, upon repeated intensive shear stress, to reach the smear point, contained in an amount (depending on the fineness, morphology and later intended use of the pigment and dye preparations) of from 2 to 25%, the remainder comprising the pigment or dye, wherein the preparations can be obtained by adding to the filter suspension of the pigment or dye a surface-active substance, or mixtures thereof, which is or are suitable in accordance with the type of pigments or dyes and with the particular intended use, and after homogeneous distribution the combination of pigment and surface-active substance, optionally after isolation in the form of a press cake, is dried, and the dried product is subsequently added to an agent which is liquid and flowable or becomes liquid at an elevated temperature, which upon intensive shear stress causes the mixture to reach the smear point, mixing is performed applying an intensive shear stress, until the smear point is reached, and then granulation is subsequently performed, in a manner known per se, if needed; and a dust measuring device in which the conditions leading to dust production are maintained during the entire measuring operation.

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First Claim