Patent ID: 7955431

Claim:
A process for improving the durability of a paint composition comprising an organic solvent phase, and based on a resin selected from the group consisting of alkyd resins, vinyl resins; aminoplast or phenolic resins, polyester resins, polyurethane resins, epoxy resins, silicone resins, cellulose resins and nitrocellulose resins, the process comprising the step of adding to said composition an amount of an organic cerium sol to produce a cerium oxide content in the paint composition of at most 3% by weight, the cerium sol comprising particles of a cerium oxide in the form of agglomerates of crystallites whose d 80 is at most 10 nm, wherein at least 80% by weight of the agglomerates comprises 3 or 4 crystallites, an amphiphilic acid system, and an organic phase, the amphiphilic acid system comprising at least one acid containing 11 to 50 carbon atoms, having at least one alpha, beta, gamma or delta branch on the atom carrying the acid hydrogen.