use of a plymeren amphiphilen connection as a stabilizer for dispersing of teilchenförmigen solids in a lipophilic or hydrophilic liquid

摘要

1,211,344. Dispersions of pigments. BALM PAINTS Ltd. 21 Nov., 1967 [25 Nov., 1966], No. 52826/66. Heading C1A. [Also in Division C3] Stable dispersions of particulate pigmentary solids in lipophilic or hydrophilic liquids in which the solids are insoluble are prepared by dispersing the solids in the liquid in the presence of a polymeric amphipathic stabilizer which associates with the surface of the disperse particles, the said stabilizer comprising at least one component which is solvated by lipophilic liquids and provides around the disperse particles a stabilizing steric barrier at least 12 Angstroms thick together with at least one nonionic chainlike component with a molecular weight of 350-5000, and optionally together with not more than 10% by weight of the stabilizer of ionizable groups, which is solvated by hydrophilic liquids and entropically stabilizes the disperse particles, the said components each being present in the stabilizer in a proportion of at least 25% by weight of the stabilizer. Specified pigments include zinc oxide, magnesium oxide, titanium dioxide, aluminium oxide and hydrated aluminium oxide, iron oxides, blanc fixe, barytes, calcium carbonate, kaolinite and dickite. Examples 20, 21, 24 and 25 illustrate the preparation of dispersions of surface-coated r-titania in an aliphatic hydrocarbon fraction, water, propylene glycol, ethylene glycol mono-n-butyl ether, and a 1 : 1 xylene/aliphatic hydrocarbon mixture.