Coating composition for plastic substrates

A plastic article having a surface which is at least partially coated with a coating composition directly onto the plastic article without the aid of a flame or corona pretreatment or the use of an adhesion promoter or tie coat, the coating composition comprising:

• (a) a crosslinkable film-forming system present in an amount ranging from about 75 to about 99.9 weight percent on a basis of total resin solids of the coating composition, the crosslinkable film-forming system comprising:
• (i) at least one crosslinkable film-forming resin;
• and
• (ii) at least one crosslinking material selected from the group consisting of aminoplasts, polyacids, anhydrides and mixtures thereof, the at least one crosslinking material being capable of reacting with the film-forming resin to form a crosslinked film;
• and
• (b) at least one adhesion promoting agent comprising a substantially saturated, predominantly hydrocarbon polymer comprising a substantially hydrogenated polydiene having a polymer backbone structure with less than about 30 weight percent of branded monomer units and having at least about 85 weight percent of hydrocarbon units and having less than about 10 weight percent of carbon to carbon double bonds, said adhesion promoting agent having an average of more than one pendant or terminal polar group per molecule which is capable of reacting with the crosslinking material, the at least one adhesion promoting agent being present in an amount ranging from about 0.1 to about 25 weight percent on a basis of total resin solids of the coating composition.