SANDABLE, SELF-HEALABLE COATING COMPOSITIONS AND A PROCESS OF USING THE SAME

摘要

The invention provides coating compositions which are simultaneously sandable and self-healable shortly after application to a substrate and without the use of thermal curing. Said compositions have a film-forming component (A) with a first acrylic polymer (ai) having a number average molecular weight of from 1500 to 3000, an equivalent weight of from 375 to 475, and a plurality of functional groups wherein at least 60 to 100 % of the functional groups are secondary hydroxyl groups, a second acrylic polymer (aii) having a number average molecular weight of from 3500 to 5000, an equivalent weight of from 550 to 750, and a plurality of functional groups with at least 75 to 100% of the functional groups being primary hydroxyl groups as well as a crosslinking component (B) comprising at least one aliphatic isocyanate functional trimer (bi), and at least one cycloaliphatic isocyanate functional trimer (bii).