申请人:Esseghir Mohamed
公开号:US20080085973A1
公开(公告)日:2008-04-10
Scorch is inhibited during the free-radical crosslinking of a crosslinkable polymer, e.g., an EPDM, by incorporating into the polymer before melt processing and crosslinking a scorch inhibiting amount of a derivative, preferably an ether, ester or urethane derivative, of a TEMPO compound, e.g., 4-hydroxy-tetrahydrocarbylpiperidin-1-oxyl. The scorch inhibitors of this invention perform as well, if not better, than their 4-hydroxy-tetrahydrocarbylpiperidin-1-oxyl counterparts in similar polymer compositions and under similar conditions in terms of scorch inhibition and ultimate degree of crosslinking, but exhibit less volatility and less migration within the polymer composition.
在可交联聚合物(例如EPDM)的自由基交联过程中,通过在熔融处理和交联之前将TEMPO化合物的衍生物(优选为醚、酯或脲衍生物)的防燃剂添加到聚合物中,可以抑制烧焦。本发明的防燃剂在类似的聚合物组合物和相似条件下,与其4-羟基四氢碳基哌啶-1-氧基衍生物相比,在防燃和最终交联程度方面表现得同样好,甚至更好,但在聚合物组合物中挥发性和迁移性都较小。