发明授权
US5514746A Process for the production of a multicoat coating, aqueous coating compositions, water-thinnable poly-acrylate resins and process for the preparation of water-thinnable polyacrylate resins 失效
制备多层涂层的方法,水性涂料组合物,可水稀释的聚丙烯酸酯树脂和制备可水稀释的聚丙烯酸酯树脂的方法

Process for the production of a multicoat coating, aqueous coating
compositions, water-thinnable poly-acrylate resins and process for the
preparation of water-thinnable polyacrylate resins
摘要:
The invention relates to a process for the production of a multicoat coating in which the aqueous topcoat composition contains a water-thinnable polyacrylate resin which has a hydroxyl value of 40 to 200, an acid value of 20 to 100 and a glass transition temperature (T.sub.G) of -40.degree. C. to +60.degree. C., and can be prepared by adding a mixture (I) of a (meth)acrylic acid ester, a copolymerizable hydroxyl-containing monomer and, if appropriate, a further ethylenically unsaturated monomer to an organic solvent and carrying out free-radical polymerization and adding, at the end of the addition of the mixture (I), a mixture of a monomer containing carboxyl groups and a monomer free from carboxyl groups and continuing the polymerization.
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