Aq. coil-coating compsn. for metal substrates - contains polyester(s) with carboxyl and hydroxyl gps., opt. acrylate¨ resin(s), amino resin(s) and wax(es)

摘要

A coil-coating process for metal objects (I) is claimed, which involves applying and hardening an aq. coating compsn. contg. COOH gp.- and OH gp.-contg. polyester(s), etc. (II); compsn. (II) contains (A) 10-60 wt% polyester(s) with acid number 35-60 and OH number 40-200 (mg KOH/g), (B) 0-50 wt% acrylate resin(s), (C) 3-28 wt% amino resin(s) and (D) 0.1-7 wt% wax(es) as structure-generating additive (wt% w.r.t. coating material without water). An aq. or water-thinnable coil-coating compsn. is provided which enables metal objects to be coated with layers 20-45 microns thick with a surface structure like that of spray paint; these coatings have good resistance to MEK etc., good ductility and good adhesion. The claims include coated metal objects obtd. by the above process, the use of such coated prods. for the prodn. of domestic equipment, and the use of wax (D) as structure-producing additive. (Dwg.0/0)