C - Chemistry – Metallurgy – 09 – D
Patent
C - Chemistry, Metallurgy
09
D
C09D 167/02 (2006.01) B05D 1/36 (2006.01) B05D 7/00 (2006.01) C09D 167/00 (2006.01)
Patent
CA 2168451
Coating composition based on polyesters which contain hydroxyl groups, process for the preparation, and its use as basecoat in the process for the production of a multicoat protective and/or decorative coating Abstract The present invention relates to coating compositions, especially basecoats, comprising at least one hydroxyl group-containing polyester, characterized in that 1. the hydroxyl group-containing polyester has a weight-average molecular weight Mw of 40,000-200,000 and a polydispersity Mw/Mn > 8, and 2. at least 50% by weight of aromatic dicarboxylic acids or their esterifiable derivatives have been employed for the preparation of the polyester, but with the maximum content of phthalic anhydride being 80% by weight and the percentages by weight being based in each case on the overall weight of the acid components employed for the preparation of the polyester. The present invention also relates to processes for the preparation of the coating compositions and to its [sic] use as basecoat in the process for the production of a multicoat protective and/or decorative coating.
L'invention a pour objet un agent de revêtement, en particulier un vernis de base, renfermant au moins un polyester à groupes hydroxyle, caractérisé en ce que (1) le polyester à groupe hydroxyle présente un poids moléculaire moyen, Mw, de 40.000 à 200.000 et une hétérogénéité Mw/Mn > 8, (2) et en ce qu'on utilise pour la fabrication du polyester au moins 50% en poids d'acides dicarboxyliques aromatiques ou de leurs dérivés estérifiables, la proportion en anhydride phtalique s'élevant au maximum à 80% en poids, les pourcentages en poids respectifs se rapportant au poids total des acides carboxyliques utilisés pour la fabrication du polyester. L'invention a également pour objet un procédé de fabrication de l'agent de revêtement, ainsi que son utilisation comme vernis de base dans un procédé de fabrication d'un revêtement multicouche protecteur et/ou ornemental.
Brunnemann Michael
Hoffmann Peter
Basf Lacke + Farben Aktiengesellschaft
Fetherstonhaugh & Co.
LandOfFree
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