Coating composition containing polytrimethylene ether diol useful as a clear coat composition and as a primer composition

A coating composition comprising a film forming binder of

• a. an acrylic polymer having pendant groups that are reactive with isocyanate moieties and having a glass transition temperature (Tg) of 10 to 80° C.;
• b. a copolymer of polytrimethylene ether diol having a Mn (number average molecular weight) of 500 to 5,000 comprising at least 50% by weight, based on the weight of the diol of polymerized 1,3-propane diol and up to 50% by weight, based on the weight of the diol of another polymerized alkane diol;
• and
• c. an organic polyisocyanate crosslinking agent.

A clear coating composition comprising a film forming binder consisting essentially of

• a. 60 to 75% by weight, based on the weight of the binder, of the acrylic polymer;
• b. 2.5 to 9.5% by weight, based on the weight of the binder of polytrimethylene ether diol having a Mn (number average molecular weight) of 500 to 5,000;
• and
• c. 22 to 31% by weight, based on the weight of the binder, of an organic polyisocyanate crosslinking agent and.
• wherein the sum of the percentages of a., b. and c. is 100%.

A two component coating composition comprising

• Component A an acrylic polymer having pendant groups that are reactive with isocyanate moieties and having a glass transition temperature (Tg) of 10 to 80° C.;
• and a polytrimethylene ether diol having a Mn (number average molecular weight) of 500 to 5,000;
• and
• Component B an organic polyisocyanate crosslinking agent;
• wherein Components A and B are thoroughly mixed together before application to a substrate.