High performance polyurethane coating compositions and...

Details High performance polyurethane coating compositions and... High performance polyurethane coating compositions and...

C - Chemistry, Metallurgy

08

G

C08G 18/10 (2006.01) C08G 18/12 (2006.01) C08G 18/48 (2006.01) C08G 18/66 (2006.01) C08G 18/80 (2006.01) C09D 175/04 (2006.01)

Patent

CA 2064986

This invention relates to polyurethane coatings formed from prepolymers made by reacting polyisocyanates with long chain polyols having an average functionality of greater than 2. The resulting prepolymers have equivalent weights greater than about 250 grams per equivalent and preferably greater than about 350 grams per equivalent. An excess of polyisocyanates is reacted with the polyol component at an equivalent ratio of greater than 4:1 equivalents isocyanate per equivalent of polyol. Excess polyisocyanate is then removed from the prepolymer. The resulting polyurethane prepolymers are chain extended with compounds having active hydrogen atoms such as water, amines or short chain polyhydroxy compounds, e.g., diols to form the resulting coatings.

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