Paintable two-component polyurethane sealant

Details Paintable two-component polyurethane sealant Paintable two-component polyurethane sealant

C - Chemistry, Metallurgy

08

G

C08G 18/10 (2006.01) C08L 75/04 (2006.01) C09J 175/04 (2006.01) C09K 3/10 (2006.01)

Patent

CA 2555645

A polyurethane sealant is provided with the properties of low modulus, high elongation, and good paint adhesion. The polyurethane sealant is prepared using a hydroxy-terminated polyoxyalkylene polyol prepolymer in the base component of the formulation, and an isocyanate-terminated polyisocyanate prepolymer in the activator component. The polyurethane sealant is also characterized in that no more than about 20 percent by weight of the polyoxyalkylene portion of the polyols used to prepare the prepolymer components used in the production of the sealant has a hydroxyl equivalent weight greater than about 1600.

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