Two-component coating compositions

摘要

Two-component coating compositions include: A) a cross-linkable binder compound having at least one functional group reactive towards isocyanate groups, B) a cross-linking agent having at least one free isocyanate group and C) a catalyst component comprising C1) a catalyst for the for the curing reaction between the functional groups of component A) and the isocyanate groups of component B), the catalyst C1) being an organo-metal compound, and C2) an oligomeric or polymeric binder compound having a glass transition temperature Tg of ≧about 20° C., measured by DSC (differential scanning calorimetry) at a heating rate of 10 K/min. The glass transition temperature Tg of the binder compound C2) is above the temperature at which the two-component coating composition is applied, preferably about 10° C. above the temperature at which the two-component coating composition is applied.

主权项

1. 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, andC2) 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.