Blocked 1,8-diazabicyclo 5.4.0 undec-7-ene bicarbonate catalyst for aerospace sealants

摘要

Compositions comprising sulfur-containing prepolymers such as polythioether prepolymers, polyepoxides, and a blocked 1,8-diazabicyclo[5.4.0]undec-7-ene bicarbonate catalyst useful as aerospace sealants are disclosed. The compositions exhibit extended working time and the curing rate can be tailored for specific applications.