B - Operations – Transporting – 01 – F
Patent
B - Operations, Transporting
01
F
B01F 17/54 (2006.01) B41J 2/01 (2006.01) B41M 5/52 (2006.01) C09D 17/00 (2006.01)
Patent
CA 2422979
Stable, aqueous dispersion containing between 20 and 80 wt.% of metal oxide and/or non-metal oxide powders, which are present in the dispersion in the form of aggregates of primary particles, whereby the average diameter of the aggregates is between 10 nm and 300 nm and the average diameter of the primary particles is between 5 and 50 nm, characterised in that the powders comprise at least two types of powder, whereby the powder types at a given pH of the dispersion display the same surface charge sign and have a zeta potential that gives rise to an electrostatic repulsion between the particles that is greater than the van der Waals attraction between the powders and the average diameters of the primary particles differ by a factor of at least 1.5 between two powder types and in the dispersion the average aggregate diameter of the second and additional powder types displays 60 to 150% of the size of the first powder type and each powder type is present in the dispersion in a quantity of at least 1 wt.%. Coating composition produced with this dispersion and containing at least one hydrophilic binder. An recording medium containing this coating composition.
Batz-Sohn Christoph
Lortz Wolfgang
Scharfe Thomas
Degussa Ag
Marks & Clerk
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