Two-component coating compositions

A vehicle body part having thereon a two-component coating composition comprising:

• A) a cross-linkable binder compound (“cross-linkable binder compound A)”) having a functional group reactive towards isocyanate groups,
• B) a cross-linking agent having a free isocyanate group and
• C) from about 1% to about 10%, by weight, of a catalyst component (“catalyst component C)”), based on the total weight of the coating composition, the catalyst component comprising:
• C1) a catalyst (“catalyst C1)”) for a curing reaction between the functional group of component A) and the isocyanate group of component B), said catalyst being an organo-metal catalyst, and
• C2) an oligomeric or polymeric binder compound (“binder compound C2)”) having a glass transition temperature Tg of ≧about 20° C., measured by DSC (differential scanning calorimetry) at a heating rate of about 10 K/min, wherein the catalyst C1 is passivated by being immobilized in the binder compound C2 at a temperature below the Tg of the binder compound C2.

A process for coating a substrate, the process comprising the steps of:

• I) applying a coating layer of a two-component coating composition to a substrate at application temperature TA, the two-component coating composition comprising:
• A) a cross-linkable binder compound (“cross-linkable binder compound A)”) having a functional group reactive towards isocyanate groups,
• B) a cross-linking agent having a free isocyanate group and
• C) from about 1% to about 10%, by weight, of a catalyst component (“catalyst component C)”), based on the total weight of the coating composition, the catalyst component comprising:
• C1) a catalyst (“catalyst C1)”) for a curing reaction between the functional group of component A) and the isocyanate group of component B), said catalyst being an organo-metal catalyst, and
• C2) an oligomeric or polymeric binder compound (“binder compound C2)”) having a glass transition temperature Tg of ≧about 20° C., measured by DSC (differential scanning calorimetry) at a heating rate of about 10 K/min, wherein the catalyst C1) is passivated by being immobilized in the binder compound C2);
• and
• II) curing said coating layer,
• wherein the glass transition temperature Tg of the binder compound C2) is above the application temperature TA.