| abstract |
Oximinosilane-terminated polymers, which, when cured at room temperature, become stable elastomers. The former have a hydrolyzable ketoximino-silyl group at each end of each molecule and are prepared by reacting a hydroxyl terminated liquid polymer with an organic diisocyanate to produce an isocyanate terminated pre-polymer. The resulting prepolymer is then converted into a mercaptan-terminated polymer, by reaction with a mercaptoalcohol or by reaction with an alkylene olefin alcohol or amine, to give an olefin-terminated polymer, which is then reacted with a dimercaptane . When the mercaptan-terminated polymer is reacted with a vinyl-oxymino-silane or a vinylalkoxy-oxyminosilane, a silane-terminated liquid polymer is obtained. Such polymers have improved elongation, moisture resistance, tensile strength, and tear properties in adhesive, coating, and sealant formulations. |