Process of forming a coating on a substrate

摘要

The present disclosure relates to a process for forming a layer of a coating composition on a substrate wherein the coating composition comprises a waterborne film forming polymer, an isocyanate and a melamine. The process involves forming a mixture of the waterborne film forming polymer and the isocyanate and allowing the mixture to mature before adding the melamine component. The result is a layer of the coating composition with a high degree of gloss and gassing resistance.

主权项

1. A process for forming a layer of a coating composition on a substrate comprising the steps of:
forming a first coating mixture, said first coating mixture comprising:
a film forming polymer having at least two different functional groups, a hydroxyl group and an amine neutralized carboxylic acid group, anda polyisocyanate, allowing said first coating mixture to mature for about 0.5 to about 60 minutes, forming a second coating mixture, said second coating mixture comprising:
an alkylated melamine that is essentially unreactive to isocyanates; andan acid catalyst, forming the coating composition by mixing together the matured first coating mixture and the second coating mixture, applying a layer of the coating composition onto the substrate; and curing the applied layer of coating composition.