C - Chemistry – Metallurgy – 09 – D
Patent
C - Chemistry, Metallurgy
09
D
C09D 175/06 (2006.01) C08G 18/66 (2006.01) C08G 18/72 (2006.01) C09D 175/08 (2006.01) C09D 175/12 (2006.01)
Patent
CA 2090908
Mo3761 MD-91-30-CT A CHIP RESISTANT POLYURETHANE COATING ABSTRACT OF THE DISCLOSURE A polyurethane coating which is chip resistant and resistant to chemical decontamination treatments which is made by reacting one component made up of isocyanate-reactive materials and a second isocyanate component. The first component includes an aromatic polyamine (preferably an aromatic diamine) and a hydroxyl terminated polyether or polyester in amounts such that the equivalent ratio of amine to hydroxyl groups is from about 80:20 to about 97:3. The second isocyanate component includes an aromatic polyisocyanate or a prepolymer of an aromatic polyisocyanate and a polyisocyanate adduct formed from either toluene diisocyanate or an aliphatic polyisocyanate in amounts such that the ratio of aromatic polyisocyanate to polyisocyanate adduct is in the range of from about 50:50 to about 75:25. Each of these components is combined, preferably in the presence of a solvent in quantities such that the equivalent ratio of isocyanate groups to isocyanate-reactive groups is in the range of from about 1.1 to about 1Ø The components may be reacted at ambient temperature. The coating material formed by this reaction is particularly useful in coating vehicles such as automobiles. Mo3761
Best Kurt E.
Boretzky Leon N.
Mcclurg David C.
Wallace Angela I.
Corporation Bayer
de Gagne Jacqueline A.
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