Aqueous dispersion of particles
AssigneeU.S. Philips Corporation
InventorsAntonius W. M. De Laat, Hermannus F. M. Schoo
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Abstract
The invention relates to a stable aqueous dispersion of particles which can be flocculated by increasing the temperature to a value above the transition temperature. The invention is characterized in that the dispersion comprises a polymer selected from the group consisting of polyvinyl methyl ether and a block copolymer of polyvinyl methyl ether and a polyvinyl ether, the ether group bonded to the main chain via the oxygen atom being adsorbed onto the surface of the particles. The invention also relates to a block polymer of the above-mentioned type and to a method of manufacturing such a block copolymer. The invention enables very fine powders of ceramic particles having a very high homogeneity to be obtained.
Claims4
A stable aqueous dispersion of particles, which dispersion can be flocculated by increasing its temperature to a value above a transition temperature, said dispersion, in addition to said particles, comprising a polymer selected from the group consisting of polyvinyl methyl ether and a block copolymer of polyvinyl methyl ether and an other polyvinyl ether, said polymer being absorbed onto the surface of the particles via oxygens of the ether groups.
Dependencies are inferred from the claim text.