Side seam-coated welded cans and process for preparation thereof

A side seam-coated welded can comprising a welded can body having a seam on the side face and a resin coating layer coating at lease one surface side of the seam, wherein said coating layer comprises a thermosetting resin suitable for paint manufacture and a thermoplastic resin having a softening point of 50.degree. to 300.degree. C. as determined according to the ring and ball method, at a volume ratio ranging (A) from 95/5 to 25/75 or (B) from 20/80 to 1/99, and one of said two resins is present in the coating in the form of a continuous phase and at lease a part of the other resin is present in the coating in the form of fine dispersed particles having a number average particle size of 0.1 to 80 .mu.m, said thermoplastic resin containing in the main chain or side chain thereof carboxyl groups at a concentration of 12 to 1400 meq per 100 g of the polymer derived from a carboxylic acid, carboxylic acid salt, carboxylic acid anhydride, carboxylic acid ester, carboxylic acid amide, ketone, carbonic acid ester, urea or urethane and having at least a film-forming molecular weight.