Corrosion resistant filler coating compsn. - comprises trimellitic acid contg. poly:carboxylic acid crosslinking mixt. and hydroxy gp.-contg. epoxy! and/or acrylic resin

摘要

In the parent patent a coating is prepd. in two steps by coating a substrate with a solvent contg. filler lacquer comprising a OH gp.-contg. oligomeric and/or polymeric cpd. (I) and are crosslinker (II) a trimellitic acid contg. polycarboxylic acid mixt. and opt. other conventional additives, hardening until water resistant, electro-dip coating with another lacquer and hardening both layers. The ratio of (I):(II) is 50:50-90:10. In this patent of addn. (I) is a hydroxy gp.-contg. epoxy and/or acrylic resin opt. mixed with OH gp. contg. polyesters. Coatings prepd. from the epoxy resin have improved chemical and mechanical properties such as hydrolysis-, impact- and corrosion resistance and adhesion strength.