C - Chemistry – Metallurgy – 08 – L
Patent
C - Chemistry, Metallurgy
08
L
C08L 67/04 (2006.01) C08G 18/08 (2006.01) C08G 18/10 (2006.01) C08G 18/12 (2006.01) C08G 18/66 (2006.01) C08L 101/00 (2006.01) C09D 167/04 (2006.01) C09D 175/06 (2006.01) C09D 201/00 (2006.01)
Patent
CA 2059571
The present invention relates to aqueous polyesters for high-solids stoving coatings which contain a) 35.0 to 65.0% by weight of a polyester resin containing urethane, carboxyl and hydroxyl groups, having an acid number of less than 22, a hydroxyl number of 40 to 110, a molecular weight of 8,000 to 50,000 and a urethane group content (-NH-CO-O-) of 6.5 to 11% by weight, and containing the reaction product of 1) 77 to 89% by weight of a branched polyester polyol having a hydroxyl number of 125 to 175, an acid number of less than 4 and a molecular weight of 2,500 to 6,500, 2) 2.5 to 4.5% by weight of a 2,2-bis-(hydroxymethyl)- alkane carboxylic acid, 3) 0 to 3.5% by weight of a diol component having a molecular weight of 62 to 250 and 4) 9 to 19% by weight of a diisocyanate component, wherein the percentages of a1), a2), a3) and a4) add up to 100%, based on the weight of a1), a2), a3) and a4), b) 0.1 to 1.5% by weight of a basic neutralizing agent which is sufficient to convert 35 to 100% of the carboxyl groups of component a) to carboxylate groups, c) 0 to 7.5% by weight of an organic auxiliary solvent and d) 26 to 64.9% by weight water, wherein the percentages of a), b), c) and d) add up to 100%, based on the weight of a), b), c) and d). The present invention also relates to a process for the preparation of these aqueous polyesters and to their use in combination with hydroxy-reactive crosslinking resins in aqueous, storage stable, high-solids stoving lacquers having a solids content of at least 50% by weight.
Blum Harald
Burgdoerfer Hans-Heribert
Hoehlein Peter
Sickert Armin
Aktiengesellschaft Bayer
Ogilvy Renault Llp/s.e.n.c.r.l.,s.r.l.
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