HYDROXY-GROUPS CONTAINING BINDER, PROCESS FOR ITS PREPARATION AND ITS USE

摘要

1. A hydroxyl-containing binder in the form of a non-aqueous dispersion. 2.1. Previous binders in the form of dispersions were difficult to stabilise. The novel non-aqueous binder dispersion has improved stability toward solvents and can be prepared reliably and economically. 2.2. A non-aqueous, hydroxyl-containing dispersion is described which is suitable as a binder and contains, in addition to organic solvents A) 15-85% by weight of film-forming, dissolved hydroxyl- and carboxyl-containing polyester-(meth)acrylic copolymers or mixtures thereof, it being possible for up to half of the molecules thereof to be esterified by a molecule of maleic acid, and B) 15-85% by weight of a disperse phase of uncrosslinked (meth)acrylic copolymers having a hydroxyl number of at least 300, obtainable by free-radical polymerisation of a) 80-100% by weight of hydroxyalkyl (meth)acrylates and b) 0-20% by weight of other alpha , beta -monounsaturated monomers, in the film-forming, dissolved, initially introduced component A). 2.3. Preparation of heat-curable multilayer coatings having a base coat and a clear coat.