| 主权项 |
1. Process for stabilising an aqueous mineral preparation comprising a step of:
(a) adding at least one aldehyde-containing and/or aldehyde-releasing and/or phenolic and/or isothiazoline biocide to said aqueous mineral preparation; characterised in that:
said mineral comprises at least one of: a ground natural calcium carbonate, a precipitated calcium carbonate, a dolomite, a surface-reacted calcium carbonate, clay, talc, TiO2, kaolin, kaolinitic clay, calcined kaolinitic clay, calcium sulfate, quartz, attapulgite, montmorillonite, diatomaceous earth, finely divided silica, aluminium oxide, aluminium hydroxide, silicates such as aluminium silicate, pumice and sepiolite, or a mixture thereof;said process comprises a step (b), which may be simultaneous and/or distinct relative to step (a), of adding at least one linear or cyclic diamine or triamine compound to said aqueous mineral preparation, the linear or cyclic diamine or triamine compound having at least one primary amine group, and where the linear diamine or triamine compound has the following formula (I): wherein: m is an integer and is either 0 or 1, n is an integer and is from 2 to 8, o is an integer and is from 0 to 3, R1 is a C1 to C12 alkyl group, and is in particular CH3, CH2CH3 or a linear C12H25 alkyl group, and R2 is CH3 or NH2, and with the proviso that when m=0, then o=0 and R2 is NH2; and where the cyclic diamine or triamine compound has one of the following formulas (II) and (III): wherein: k and l are the same or different and are either 0 or 1, R3 is either H or CH3, and R4 and R5 are the same or different and selected from H and CH3,
said biocide(s) are added to said aqueous preparation in an amount corresponding to from 90 to 1 350 ppm based on the weight of the aqueous phase of said aqueous preparation; andsaid linear or cyclic diamine or triamine compound(s) are added to said aqueous preparation in an amount corresponding to from 600 to 1 200 ppm, based on the weight of the aqueous phase of said aqueous preparation. |
