Coating composition comprising an amide group containing macromolecular compound usable as primer for a fluororesin layer

摘要

The present invention provides a coating composition free from hexavalent chromium to serve as a binder component but having adhesion comparable to the primer based on chromate phosphate even if baked at elevated temperature for a long time. It is another object according to the present invention to provide a composition in which the heat resistance of resin having an amide group is improved. The present invention relates to a coating composition comprising an amide group-containable macromolecule compound (A) having an amide group or to have an amide group and an anti-oxidizing material (B) capable of inhibiting oxidation of the amide group, wherein the amide group-containable macromolecule compound(A) is an amide group-containing polymer (a1) having an amide group and an aromatic ring, and/or an amide group-containing-polymer precursor (a2) to convert into the amide group-containing polymer (a1) by baking at a time of coating with said coating composition, and said anti-oxidizing material (B) accounts for 0.1 to 20 mass % of a total amount of said amide group-containable macromolecule compound (A) and said anti-oxidizing material (B).