Two part polyurethane sealant composition with low modulus and good paintability

• Main Author: MADAJ EDMUND J
• Format: Patent
• Language: English
• Published: 07.10.2004
• Edition: 7
• Subjects: ADHESIVES; CHEMISTRY; COMPOSITIONS BASED THEREON; COMPOSITIONS OF MACROMOLECULAR COMPOUNDS; DYES; MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONSONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS; MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FORELSEWHERE; METALLURGY; MISCELLANEOUS APPLICATIONS OF MATERIALS; MISCELLANEOUS COMPOSITIONS; NATURAL RESINS; ORGANIC MACROMOLECULAR COMPOUNDS; PAINTS; POLISHES; THEIR PREPARATION OR CHEMICAL WORKING-UP

A polyurethane sealant is the reaction product of a hydroxy-terminated toluenediisocyanate/polyoxyalkylene polyol prepolymer component, an isocyanate-terminated toluenediisocyanate/polyoxyalkylene polyol activator component, and at least one of a diphenylmethane diisocyanate prepolymer component and a diphenylmethane diisocyanate monomer component. A method for making a sealant including providing a base component containing a hydroxy-terminated toluenediisocyanate/polyoxyalkylene polyol prepolymer, an activator component containing an isocyanate-terminated toluenediisocyanate/polyoxyalkylene polyol, and a modifier component containing at least one of a diphenylmethane diisocyanate prepolymer and a diphenylmethane diisocyanate monomer, and combining the base component, activator component, and modifier component to form a polyurethane reaction product.