PROCESS FOR THE PREPARATION OF THE TOP COAT LAYER OF AN AUTOMOTIVE OEM MULTI-LAYER COATING

摘要

A coating process wherein a precoated automotive substrate is OEM top coated with an aqueous two-component polyurethane top coating composition prepared by static mixing a non-aqueous hydrophobic polyisocyanate crosslinker component and an aqueous binder component having a binder solids content comprising at least one water-dilutable hydroxyl-functional binder and 5 to 30 wt.-% of a urethane compound A with at least two terminal urethane groups (-NHC(O)OR; R = hydrocarbyl residue of a monoalcohol) and having a number-average molar mass (Mn) of from 400 to 5,000.