COATING COMPOSITIONS

摘要

A coating composition comprises (A) a hydroxy component having at least two free hydroxy groups per molecule and (B) an anhydride component having at least two cyclic carboxylic acid anhydride groups per molecule, at least one of (A) and (B) being a film-forming polymer. The anhydride component (B) contains a catalytically effective amount of pendent amine groups for accelerating the curing reaction between the hydroxy groups of (A) and the anhydride groups of (B). The proportion of amine groups to cyclic carboxylic acid anhydride groups in the anhydride component (B) is no more than 4:1 and the content of free carboxylic acid groups in the anhydride component (B), if any are present, is less than 200 mole per cent based on the amine groups. The coating composition can be used as a clear or pigmented coating on a wide variety of substrates such as metal, wood, glass or plastics.