| 摘要 |
Aqueous dispersions containing a polymer and a clay, comprising at least a) 10 - 40 pbw of an aliphatic hydrocarbon solvent-insoluble natural or synthetic resinous compound, b) 1 - 10 pbw of an aliphatic hydrocarbon solvent-insoluble elastomeric polymer or copolymer based on one or more ethylenically unsaturated compounds, which polymer is miscible with the resinous compound under a) in the weight ratio as specified hereinbefore, c) 0 - 30 pbw of a plasticizing compound for the resinous compound as under a), d) 0 - 2 pbw of an adhesion-promoting compound, e) 1 - 20 pbw of a clay-based dispersing agent, which clay has a specific surface area > 40 m<2>/g, a quartz content < 15 % m and a cation-exchange capacity > 20 mVal/100g, and wherein the exchangeable cat ions are predominantly di- and/or trivalent. f) 0.1 - 4 pbw of an alkali or alkaline earth metal salt, and g) 20 - 80 pbw of water, coatings based on such dispersions and their use.
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