1. Field Of The Invention
This invention relates to a thermosetting coating composition and in particular to a thermosetting coating composition of a hydroxyl containing polymer and a polyisocyanate.
2. Description Of the Prior Art
Thermosetting coating compositions are well known in the art, in particular, thermosetting compositions utilizing polyesters are known, as shown in Sekmakas U.S. Pat. No. 3,457,324, issued July 22, 1969. Also, thermosetting coating compositions of a hydroxyl containing polyester and a blocked polyisocyanate are known as shown in Steinmetz U.S. Pat. No. 3,808,160, issued Apr. 30, 1974. Coating compositions disclosed in these patents form good quality finishes. However, industry requires coatings of improved quality for finishes for appliances such as stoves, refrigerators, washers, dryers and the like, that are highly durable, flexible, scratch resistant, mar resistant, stain resistant and detergent resistant. Also, the industry is in need of a coating composition for coils or sheets of metal that can be applied by conventional coil coating techniques which will provide finishes with improved flexibility and that will withstand post-forming operations that are used to make the aforementioned appliances.