| 摘要 |
Aqueous two-component coating compositions and emulsions suitable for their preparation are described. The coating compositions comprise: A) from more than 10 to 40 % by weight of one or more polyols having a number average molecular mass (Mn) of 500 - 200,000, an OH number of from 15 to 300 and a content of 5 - 400 milliequivalents/100 g of solid resin of ionic groups and/or groups which can be converted into ionic groups, at least some of which are present in neutralised form, B) from 0.5 to 10 % by weight of one or more chlorinated polyolefins having a degree of chlorination of from 15 to 35 % by weight, C) from 5 to 40 % by weight of one or more aromatic solvents having a boiling range of 100 - 160 DEG C, D) from 25 to 75 % by weight of water, E) from 0 to 30 % by weight of one or more other water-dilutable binders which do not contain any NCO reactive groups, the sum of the % by weight of components A) to E) adding up to 100 % by weight, and F) one or more polyisocyanates having on average at least two free isocyanate groups per molecule, in an amount such that the ratio of the reactive isocyanate groups to the OH groups of the polyols is from 0.5 : 1 to 5 : 1. The coating compositions are suitable for producing single-coat finishes or base coats on plastics substrates. |
