The reactivity of vinylsulfone-based reactive dyes is between dichloro-s-triazine and monochloro-s-triazine, and it is a medium-temperature reactive dye. It is characterized by acid and alkali resistance, so pre-alkali can be used during dyeing. Vinylsulfone-based dyes are bright in color. The most used brilliant blue R is one of the representative dyes.
KN type from Shanghai No. 8 Dyeing and Chemical Plant, Everzol Everzol of Taiwan, Destar Remazol, Sumitomo Sumfix of Japan, Kyungin Kiscozol VS of Korea, etc.