| 摘要 |
The invention relates to an aqueous polymer dispersion which can be obtained from a mixture of monomers comprising, in parts by weight: a) 100 of at least one ethylenically unsaturated monomer not comprising an ionic group, b) 0.5 to 15 of at least one ethylenically unsaturated monomer carrying at least one carboxyl and/or carboxylic anhydride functional group, c) at least one ethylenically unsaturated monomer carrying at least one second functionality selected from: phosphate, phosphonate or phosphinate, in an amount such that the ratio c/(b+c) varies from 0.05 to 0.4, d) 0 to 2 of at least one ethylenically unsaturated monomer carrying at least one alkoxysilane functional group, e) 0 to 5 of at least one ethylenically unsaturated monomer additionally carrying at least one active carbonyl functional group or an other aldhehyde-reactive functional group, such as an ureido derivative, or morpholine, imidazoline, oxazolidine, aziridine, or an aldhehyde-reactive amine function, f) 0 to 10, preferably 2 to 8, of at least one ethylenically unsaturated monomer carrying at least one functional group selected from hydroxyl and primary or secondary amine. The invention also relates to a preparation process, to a coating composition comprising the said dispersion and to a method of use in coatings for metal or plastic substrates, in particular corrosion-inhibiting coatings for metal substrates.
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