ALUMINUM COMPOUNDS AS ADDITIONAL CROSS-LINKERS FOR AIR-DRYING HIGH-SOLIDS ALKYD PAINTS

Aluminium compounds, especially complexes of alcohols, are known as ad ditional crosslinkers for air-drying alkyd paints. Particularly, the d rying behavior of high-solids alkyd systems applied under adverse cond itions may be improved distinctly. Besides the ether- and peroxy-cross links resulting from oxidative drying, coordinative crosslinking occur s. However, exterior weathering of paint films containing Al-complexes frequently results in severe embrittlement. In order to cope with the se problems, drying and aging of alkyds and Al-complexes were investig ated. All ligands in the complex appeared to get lost during drying, a probable cause of poor weathering performance. Using specially develo ped alkyd paints for Al-compounds, possible ways of controlling embrit tlement are discussed.