Aqueous sheet silicate dispersions, use of these dispersions as coating assistants and water-dilutable coating compositions containing sheet silicates
AssigneeBASF Lacke + Farben, AG
InventorsRalf Berg, Muller Bodo
Life of this patent
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Abstract
The invention relates to dispersions which are obtainable from sheet silicates, a protective colloid and an aqueous dispersant and are suitable for the incorporation of sheet silicates into water-dilutable coating compositions. The dispersions according to the invention are obtainable using poly(propylene oxide) as the protective colloid, and the poly(propylene oxide) contains no hydrophobic terminal groups, has on average at least one hydroxyl group per molecule and may optionally contain up to 40% by weight of --CH.sub.2 --CH.sub.2 --O-- units.
Claims12
A method of coating a substrate comprising:
- preparing a dispersion of a sheet silicate, an aqueous dispersant and a protective colloid which comprises a poly(propylene oxide) polymer having a mean molecular weight of about 500 to about 8,000 and up to about 40% by weight --CH.sub.2 --CH.sub.2 --O units and containing no hydrophobic terminal groups, and on average at least one hydroxyl group per molecule;
- incorporating said dispersion into a water-dilutable coating composition;
- and
- applying said water-dilutable composition to a substrate.
A method of coating a substrate comprising:
- preparing a dispersion of a sheet silicate, an aqueous dispersant and a protective colloid which comprises a poly(propylene oxide) homopolymer having a mean molecular weight of about 400 to about 1,000 and containing no hydrophobic terminal groups, and further containing on average at least one hydroxyl group per molecule;
- incorporating said dispersion into a water-dilutable coating composition;
- and
- applying said water-dilutable composition to a substrate.
A method of coating a substrate comprising:
- preparing a dispersion of a sheet silicate, an aqueous dispersant and a protective colloid which comprises a poly(propylene oxide) homopolymer having a mean molecular weight of about 400 to about 1,000, composed of straight-chain molecules and containing on average two hydroxyl groups per molecule;
- incorporating said dispersion into a water-dilutable coating composition;
- and
- applying said water-dilutable composition to a substrate.
Dependencies are inferred from the claim text.